2019-05-19 15:51:43 +02:00
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2017-06-28 10:11:05 -05:00
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2018-01-16 17:16:32 +01:00
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2017-06-28 10:11:05 -05:00
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2019-05-13 12:01:31 -05:00
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2019-06-27 20:50:46 -05:00
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2017-06-28 10:11:05 -05:00
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2019-03-01 11:19:03 +01:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:42 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-09 22:39:15 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:52 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2018-01-10 14:22:38 -08:00
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2018-06-19 10:47:50 -05:00
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2019-04-04 12:17:35 -05:00
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2019-09-23 02:02:38 -07:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:51 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-09 22:39:15 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-09 22:39:15 -05:00
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2019-07-17 20:36:50 -05:00
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2018-05-09 22:39:15 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-09 22:39:15 -05:00
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2019-07-17 20:36:52 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:52 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:52 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:50 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-08-29 12:51:03 -05:00
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2017-06-28 10:11:07 -05:00
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2017-08-29 12:51:03 -05:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:42 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-10-19 11:27:24 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:48 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:48 -05:00
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2017-06-28 10:11:05 -05:00
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2017-10-19 11:27:24 -05:00
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2017-06-28 10:11:05 -05:00
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objtool: Assume unannotated UD2 instructions are dead ends
Arnd reported some false positive warnings with GCC 7:
drivers/hid/wacom_wac.o: warning: objtool: wacom_bpt3_touch()+0x2a5: stack state mismatch: cfa1=7+8 cfa2=6+16
drivers/iio/adc/vf610_adc.o: warning: objtool: vf610_adc_calculate_rates() falls through to next function vf610_adc_sample_set()
drivers/pwm/pwm-hibvt.o: warning: objtool: hibvt_pwm_get_state() falls through to next function hibvt_pwm_remove()
drivers/pwm/pwm-mediatek.o: warning: objtool: mtk_pwm_config() falls through to next function mtk_pwm_enable()
drivers/spi/spi-bcm2835.o: warning: objtool: .text: unexpected end of section
drivers/spi/spi-bcm2835aux.o: warning: objtool: .text: unexpected end of section
drivers/watchdog/digicolor_wdt.o: warning: objtool: dc_wdt_get_timeleft() falls through to next function dc_wdt_restart()
When GCC 7 detects a potential divide-by-zero condition, it sometimes
inserts a UD2 instruction for the case where the divisor is zero,
instead of letting the hardware trap on the divide instruction.
Objtool doesn't consider UD2 to be fatal unless it's annotated with
unreachable(). So it considers the GCC-generated UD2 to be non-fatal,
and it tries to follow the control flow past the UD2 and gets
confused.
Previously, objtool *did* assume UD2 was always a dead end. That
changed with the following commit:
d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
The motivation behind that change was that Peter was planning on using
UD2 for __WARN(), which is *not* a dead end. However, it turns out
that some emulators rely on UD2 being fatal, so he ended up using
'ud0' instead:
9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
For GCC 4.5+, it should be safe to go back to the previous assumption
that UD2 is fatal, even when it's not annotated with unreachable().
But for pre-4.5 versions of GCC, the unreachable() macro isn't
supported, so such cases of UD2 need to be explicitly annotated as
reachable.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/e57fa9dfede25f79487da8126ee9cdf7b856db65.1501188854.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-07-27 15:56:53 -05:00
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2017-06-28 10:11:05 -05:00
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objtool: Assume unannotated UD2 instructions are dead ends
Arnd reported some false positive warnings with GCC 7:
drivers/hid/wacom_wac.o: warning: objtool: wacom_bpt3_touch()+0x2a5: stack state mismatch: cfa1=7+8 cfa2=6+16
drivers/iio/adc/vf610_adc.o: warning: objtool: vf610_adc_calculate_rates() falls through to next function vf610_adc_sample_set()
drivers/pwm/pwm-hibvt.o: warning: objtool: hibvt_pwm_get_state() falls through to next function hibvt_pwm_remove()
drivers/pwm/pwm-mediatek.o: warning: objtool: mtk_pwm_config() falls through to next function mtk_pwm_enable()
drivers/spi/spi-bcm2835.o: warning: objtool: .text: unexpected end of section
drivers/spi/spi-bcm2835aux.o: warning: objtool: .text: unexpected end of section
drivers/watchdog/digicolor_wdt.o: warning: objtool: dc_wdt_get_timeleft() falls through to next function dc_wdt_restart()
When GCC 7 detects a potential divide-by-zero condition, it sometimes
inserts a UD2 instruction for the case where the divisor is zero,
instead of letting the hardware trap on the divide instruction.
Objtool doesn't consider UD2 to be fatal unless it's annotated with
unreachable(). So it considers the GCC-generated UD2 to be non-fatal,
and it tries to follow the control flow past the UD2 and gets
confused.
Previously, objtool *did* assume UD2 was always a dead end. That
changed with the following commit:
d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
The motivation behind that change was that Peter was planning on using
UD2 for __WARN(), which is *not* a dead end. However, it turns out
that some emulators rely on UD2 being fatal, so he ended up using
'ud0' instead:
9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
For GCC 4.5+, it should be safe to go back to the previous assumption
that UD2 is fatal, even when it's not annotated with unreachable().
But for pre-4.5 versions of GCC, the unreachable() macro isn't
supported, so such cases of UD2 need to be explicitly annotated as
reachable.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/e57fa9dfede25f79487da8126ee9cdf7b856db65.1501188854.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-07-27 15:56:53 -05:00
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2017-06-28 10:11:05 -05:00
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objtool: Assume unannotated UD2 instructions are dead ends
Arnd reported some false positive warnings with GCC 7:
drivers/hid/wacom_wac.o: warning: objtool: wacom_bpt3_touch()+0x2a5: stack state mismatch: cfa1=7+8 cfa2=6+16
drivers/iio/adc/vf610_adc.o: warning: objtool: vf610_adc_calculate_rates() falls through to next function vf610_adc_sample_set()
drivers/pwm/pwm-hibvt.o: warning: objtool: hibvt_pwm_get_state() falls through to next function hibvt_pwm_remove()
drivers/pwm/pwm-mediatek.o: warning: objtool: mtk_pwm_config() falls through to next function mtk_pwm_enable()
drivers/spi/spi-bcm2835.o: warning: objtool: .text: unexpected end of section
drivers/spi/spi-bcm2835aux.o: warning: objtool: .text: unexpected end of section
drivers/watchdog/digicolor_wdt.o: warning: objtool: dc_wdt_get_timeleft() falls through to next function dc_wdt_restart()
When GCC 7 detects a potential divide-by-zero condition, it sometimes
inserts a UD2 instruction for the case where the divisor is zero,
instead of letting the hardware trap on the divide instruction.
Objtool doesn't consider UD2 to be fatal unless it's annotated with
unreachable(). So it considers the GCC-generated UD2 to be non-fatal,
and it tries to follow the control flow past the UD2 and gets
confused.
Previously, objtool *did* assume UD2 was always a dead end. That
changed with the following commit:
d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
The motivation behind that change was that Peter was planning on using
UD2 for __WARN(), which is *not* a dead end. However, it turns out
that some emulators rely on UD2 being fatal, so he ended up using
'ud0' instead:
9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
For GCC 4.5+, it should be safe to go back to the previous assumption
that UD2 is fatal, even when it's not annotated with unreachable().
But for pre-4.5 versions of GCC, the unreachable() macro isn't
supported, so such cases of UD2 need to be explicitly annotated as
reachable.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/e57fa9dfede25f79487da8126ee9cdf7b856db65.1501188854.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-07-27 15:56:53 -05:00
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2017-06-28 10:11:05 -05:00
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objtool: Assume unannotated UD2 instructions are dead ends
Arnd reported some false positive warnings with GCC 7:
drivers/hid/wacom_wac.o: warning: objtool: wacom_bpt3_touch()+0x2a5: stack state mismatch: cfa1=7+8 cfa2=6+16
drivers/iio/adc/vf610_adc.o: warning: objtool: vf610_adc_calculate_rates() falls through to next function vf610_adc_sample_set()
drivers/pwm/pwm-hibvt.o: warning: objtool: hibvt_pwm_get_state() falls through to next function hibvt_pwm_remove()
drivers/pwm/pwm-mediatek.o: warning: objtool: mtk_pwm_config() falls through to next function mtk_pwm_enable()
drivers/spi/spi-bcm2835.o: warning: objtool: .text: unexpected end of section
drivers/spi/spi-bcm2835aux.o: warning: objtool: .text: unexpected end of section
drivers/watchdog/digicolor_wdt.o: warning: objtool: dc_wdt_get_timeleft() falls through to next function dc_wdt_restart()
When GCC 7 detects a potential divide-by-zero condition, it sometimes
inserts a UD2 instruction for the case where the divisor is zero,
instead of letting the hardware trap on the divide instruction.
Objtool doesn't consider UD2 to be fatal unless it's annotated with
unreachable(). So it considers the GCC-generated UD2 to be non-fatal,
and it tries to follow the control flow past the UD2 and gets
confused.
Previously, objtool *did* assume UD2 was always a dead end. That
changed with the following commit:
d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
The motivation behind that change was that Peter was planning on using
UD2 for __WARN(), which is *not* a dead end. However, it turns out
that some emulators rely on UD2 being fatal, so he ended up using
'ud0' instead:
9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
For GCC 4.5+, it should be safe to go back to the previous assumption
that UD2 is fatal, even when it's not annotated with unreachable().
But for pre-4.5 versions of GCC, the unreachable() macro isn't
supported, so such cases of UD2 need to be explicitly annotated as
reachable.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/e57fa9dfede25f79487da8126ee9cdf7b856db65.1501188854.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-07-27 15:56:53 -05:00
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2017-06-28 10:11:05 -05:00
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2019-02-27 14:04:13 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-27 14:04:13 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-27 14:04:13 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-27 14:04:13 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-27 14:04:13 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-27 14:04:13 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-25 12:50:09 +01:00
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2019-10-21 15:11:49 +02:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:46 -05:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:48 -05:00
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2017-06-28 10:11:05 -05:00
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2018-01-11 21:46:24 +00:00
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2019-03-18 14:33:07 +01:00
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2018-01-11 21:46:24 +00:00
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2019-03-18 14:33:07 +01:00
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2018-01-11 21:46:24 +00:00
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2019-03-18 14:33:07 +01:00
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2018-01-11 21:46:24 +00:00
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2017-06-28 10:11:05 -05:00
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2019-05-13 12:01:31 -05:00
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2017-06-28 10:11:05 -05:00
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2018-01-11 21:46:23 +00:00
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2019-07-17 20:36:57 -05:00
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2018-01-16 10:24:06 +01:00
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2018-01-11 21:46:23 +00:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:52 -05:00
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2019-03-06 12:58:15 +01:00
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2017-06-28 10:11:05 -05:00
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2018-06-01 07:23:51 -05:00
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2019-03-06 12:58:15 +01:00
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2018-06-01 07:23:51 -05:00
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2019-03-06 12:58:15 +01:00
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2019-07-17 20:36:53 -05:00
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2019-03-06 12:58:15 +01:00
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2019-07-17 20:36:52 -05:00
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2019-03-06 12:58:15 +01:00
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2018-06-01 07:23:51 -05:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:39 -06:00
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2018-01-16 10:24:06 +01:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:39 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:40 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:40 -06:00
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2019-05-13 12:01:31 -05:00
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2018-01-29 22:00:40 -06:00
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2019-05-13 12:01:31 -05:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:40 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:39 -06:00
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2019-02-25 10:31:24 +01:00
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2018-01-29 22:00:39 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:40 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:40 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:40 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-11 21:46:24 +00:00
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2017-06-28 10:11:05 -05:00
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2019-03-01 11:19:03 +01:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-10 17:48:49 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2018-05-10 17:48:49 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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objtool: Fix seg fault on bad switch table entry
In one rare case, Clang generated the following code:
5ca: 83 e0 21 and $0x21,%eax
5cd: b9 04 00 00 00 mov $0x4,%ecx
5d2: ff 24 c5 00 00 00 00 jmpq *0x0(,%rax,8)
5d5: R_X86_64_32S .rodata+0x38
which uses the corresponding jump table relocations:
000000000038 000200000001 R_X86_64_64 0000000000000000 .text + 834
000000000040 000200000001 R_X86_64_64 0000000000000000 .text + 5d9
000000000048 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000050 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000058 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000060 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000068 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000070 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000078 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000080 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000088 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000090 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000098 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000a0 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000a8 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000b0 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000b8 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000c0 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000c8 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000d0 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000d8 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000e0 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000e8 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000f0 000200000001 R_X86_64_64 0000000000000000 .text + b96
0000000000f8 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000100 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000108 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000110 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000118 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000120 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000128 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000130 000200000001 R_X86_64_64 0000000000000000 .text + b96
000000000138 000200000001 R_X86_64_64 0000000000000000 .text + 82f
000000000140 000200000001 R_X86_64_64 0000000000000000 .text + 828
Since %eax was masked with 0x21, only the first two and the last two
entries are possible.
Objtool doesn't actually emulate all the code, so it isn't smart enough
to know that all the middle entries aren't reachable. They point to the
NOP padding area after the end of the function, so objtool seg faulted
when it tried to dereference a NULL insn->func.
After this fix, objtool still gives an "unreachable" error because it
stops reading the jump table when it encounters the bad addresses:
/home/jpoimboe/objtool-tests/adm1275.o: warning: objtool: adm1275_probe()+0x828: unreachable instruction
While the above code is technically correct, it's very wasteful of
memory -- it uses 34 jump table entries when only 4 are needed. It's
also not possible for objtool to validate this type of switch table
because the unused entries point outside the function and objtool has no
way of determining if that's intentional. Hopefully the Clang folks can
fix it.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/a9db88eec4f1ca089e040989846961748238b6d8.1563413318.git.jpoimboe@redhat.com
2019-07-17 20:36:55 -05:00
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2018-05-09 22:39:15 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-10 17:48:49 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2018-02-08 14:02:32 +01:00
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2017-06-28 10:11:05 -05:00
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2018-02-08 14:02:32 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2018-05-14 08:53:24 -05:00
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2017-06-28 10:11:05 -05:00
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2018-02-08 14:02:32 +01:00
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2018-05-18 15:10:34 -05:00
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2018-02-08 14:02:32 +01:00
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2018-05-18 15:10:34 -05:00
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2017-06-28 10:11:05 -05:00
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2018-09-07 08:12:01 -05:00
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2017-06-28 10:11:05 -05:00
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2018-05-14 08:53:24 -05:00
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2019-07-17 20:36:53 -05:00
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2018-09-07 08:12:01 -05:00
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2018-05-14 08:53:24 -05:00
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2017-06-28 10:11:05 -05:00
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2019-06-27 20:50:46 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2018-02-28 07:19:21 -06:00
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2019-07-17 20:36:53 -05:00
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2018-05-18 15:10:34 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
|
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2017-06-28 10:11:05 -05:00
|
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|
|
objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
|
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2017-06-28 10:11:05 -05:00
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2018-05-09 22:39:15 -05:00
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2018-02-08 14:02:32 +01:00
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2019-07-17 20:36:53 -05:00
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2018-02-08 14:02:32 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
|
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|
objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
|
|
|
|
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|
|
2017-06-28 10:11:05 -05:00
|
|
|
|
|
|
|
|
|
objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
|
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2017-06-28 10:11:05 -05:00
|
|
|
|
objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
|
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|
2017-06-28 10:11:05 -05:00
|
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
|
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2018-09-07 08:12:01 -05:00
|
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2017-06-28 10:11:05 -05:00
|
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
|
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|
objtool: Support repeated uses of the same C jump table
This fixes objtool for both a GCC issue and a Clang issue:
1) GCC issue:
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8d5: sibling call from callable instruction with modified stack frame
With CONFIG_RETPOLINE=n, GCC is doing the following optimization in
___bpf_prog_run().
Before:
select_insn:
jmp *jumptable(,%rax,8)
...
ALU64_ADD_X:
...
jmp select_insn
ALU_ADD_X:
...
jmp select_insn
After:
select_insn:
jmp *jumptable(, %rax, 8)
...
ALU64_ADD_X:
...
jmp *jumptable(, %rax, 8)
ALU_ADD_X:
...
jmp *jumptable(, %rax, 8)
This confuses objtool. It has never seen multiple indirect jump
sites which use the same jump table.
For GCC switch tables, the only way of detecting the size of a table
is by continuing to scan for more tables. The size of the previous
table can only be determined after another switch table is found, or
when the scan reaches the end of the function.
That logic was reused for C jump tables, and was based on the
assumption that each jump table only has a single jump site. The
above optimization breaks that assumption.
2) Clang issue:
drivers/usb/misc/sisusbvga/sisusb.o: warning: objtool: sisusb_write_mem_bulk()+0x588: can't find switch jump table
With clang 9, code can be generated where a function contains two
indirect jump instructions which use the same switch table.
The fix is the same for both issues: split the jump table parsing into
two passes.
In the first pass, locate the heads of all switch tables for the
function and mark their locations.
In the second pass, parse the switch tables and add them.
Fixes: e55a73251da3 ("bpf: Fix ORC unwinding in non-JIT BPF code")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/e995befaada9d4d8b2cf788ff3f566ba900d2b4d.1563413318.git.jpoimboe@redhat.com
Co-developed-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-07-17 20:36:54 -05:00
|
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|
2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2018-05-18 08:47:12 +02:00
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2017-07-11 10:33:43 -05:00
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2018-01-16 10:24:06 +01:00
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2018-03-06 17:58:15 -06:00
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2018-01-16 10:24:06 +01:00
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2018-03-06 17:58:15 -06:00
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2018-01-16 10:24:06 +01:00
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2018-03-06 17:58:15 -06:00
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2018-01-16 10:24:06 +01:00
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2018-03-06 17:58:15 -06:00
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2018-01-16 10:24:06 +01:00
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2018-03-06 17:58:15 -06:00
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2018-01-16 10:24:06 +01:00
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2018-09-07 08:12:01 -05:00
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2019-06-27 20:50:46 -05:00
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2018-09-07 08:12:01 -05:00
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2019-06-27 20:50:46 -05:00
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2018-09-07 08:12:01 -05:00
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2017-06-28 10:11:05 -05:00
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2018-09-07 08:12:01 -05:00
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2017-06-28 10:11:05 -05:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:05 -05:00
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2019-03-18 14:33:07 +01:00
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2018-01-11 21:46:24 +00:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:39 -06:00
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2017-06-28 10:11:05 -05:00
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2018-01-29 22:00:39 -06:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:53 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2018-01-16 10:24:06 +01:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:42 -05:00
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2019-02-25 12:50:09 +01:00
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2017-07-11 10:33:42 -05:00
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2019-02-25 12:50:09 +01:00
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2017-07-11 10:33:42 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-07-11 10:33:42 -05:00
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2017-06-28 10:11:07 -05:00
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2017-09-20 16:24:32 -05:00
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2017-08-29 12:51:03 -05:00
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2017-09-20 16:24:32 -05:00
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2017-08-29 12:51:03 -05:00
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2017-09-20 16:24:32 -05:00
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2017-08-29 12:51:03 -05:00
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2017-09-20 16:24:32 -05:00
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2017-08-29 12:51:03 -05:00
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2018-03-22 13:00:37 -05:00
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2017-08-29 12:51:03 -05:00
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2017-06-28 10:11:07 -05:00
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2017-08-29 12:51:03 -05:00
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2017-06-28 10:11:07 -05:00
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2017-08-29 12:51:03 -05:00
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2017-06-28 10:11:07 -05:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
|
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|
2017-06-28 10:11:07 -05:00
|
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|
|
objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
|
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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2019-02-25 12:50:09 +01:00
|
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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2017-07-24 18:34:14 -05:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:07 -05:00
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2017-07-11 10:33:42 -05:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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objtool: Track DRAP separately from callee-saved registers
When GCC realigns a function's stack, it sometimes uses %r13 as the DRAP
register, like:
push %r13
lea 0x10(%rsp), %r13
and $0xfffffffffffffff0, %rsp
pushq -0x8(%r13)
push %rbp
mov %rsp, %rbp
push %r13
...
mov -0x8(%rbp),%r13
leaveq
lea -0x10(%r13), %rsp
pop %r13
retq
Since %r13 was pushed onto the stack twice, its two stack locations need
to be stored separately. The first push of %r13 is its original value,
and the second push of %r13 is the caller's stack frame address.
Since %r13 is a callee-saved register, we need to track the stack
location of its original value separately from the DRAP register.
This fixes the following false positive warning:
lib/ubsan.o: warning: objtool: val_to_string.constprop.7()+0x97: leave instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Link: http://lkml.kernel.org/r/3da23a6d4c5b3c1e21fc2ccc21a73941b97ff20a.1502401017.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-10 16:37:26 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:48 -05:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:52 -05:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:52 -05:00
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2019-02-25 12:50:09 +01:00
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2019-02-25 11:10:55 +01:00
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2019-07-17 20:36:52 -05:00
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2019-02-25 11:10:55 +01:00
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2019-02-25 12:50:09 +01:00
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2019-03-06 12:58:15 +01:00
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2019-02-25 12:50:09 +01:00
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2019-03-06 12:58:15 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:47 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-24 17:47:26 -05:00
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2017-06-28 10:11:05 -05:00
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2017-08-10 16:37:25 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2018-05-09 22:39:15 -05:00
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2017-08-11 12:24:15 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-07 09:19:42 -05:00
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2017-08-10 16:37:25 -05:00
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2017-07-07 09:19:42 -05:00
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2019-07-24 17:47:26 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-24 17:47:26 -05:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2019-07-17 20:36:47 -05:00
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2017-07-11 10:33:43 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-24 17:47:26 -05:00
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2017-06-28 10:11:07 -05:00
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2018-01-29 22:00:39 -06:00
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2019-03-01 11:19:03 +01:00
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2018-01-29 22:00:39 -06:00
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2019-03-01 11:19:03 +01:00
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2019-07-17 20:36:47 -05:00
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objtool: Add --backtrace support
For when you want to know the path that reached your fail state:
$ ./objtool check --no-fp --backtrace arch/x86/lib/usercopy_64.o
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0x3: UACCESS disable without MEMOPs: __clear_user()
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x3a: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x2e: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x18: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0xffffffffffffffff: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x5: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x0: <=== (func)
0000000000000000 <__clear_user>:
0: e8 00 00 00 00 callq 5 <__clear_user+0x5>
1: R_X86_64_PLT32 __fentry__-0x4
5: 90 nop
6: 90 nop
7: 90 nop
8: 48 89 f0 mov %rsi,%rax
b: 48 c1 ee 03 shr $0x3,%rsi
f: 83 e0 07 and $0x7,%eax
12: 48 89 f1 mov %rsi,%rcx
15: 48 85 c9 test %rcx,%rcx
18: 74 0f je 29 <__clear_user+0x29>
1a: 48 c7 07 00 00 00 00 movq $0x0,(%rdi)
21: 48 83 c7 08 add $0x8,%rdi
25: ff c9 dec %ecx
27: 75 f1 jne 1a <__clear_user+0x1a>
29: 48 89 c1 mov %rax,%rcx
2c: 85 c9 test %ecx,%ecx
2e: 74 0a je 3a <__clear_user+0x3a>
30: c6 07 00 movb $0x0,(%rdi)
33: 48 ff c7 inc %rdi
36: ff c9 dec %ecx
38: 75 f6 jne 30 <__clear_user+0x30>
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 48 89 c8 mov %rcx,%rax
40: c3 retq
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-03-01 11:15:49 +01:00
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2018-01-29 22:00:39 -06:00
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2019-03-01 11:19:03 +01:00
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2017-06-28 10:11:05 -05:00
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2019-02-25 12:50:09 +01:00
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2019-02-25 11:10:55 +01:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2019-07-17 20:36:47 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:51 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:51 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:52 -05:00
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2019-03-06 12:58:15 +01:00
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2017-06-28 10:11:05 -05:00
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2019-03-06 12:58:15 +01:00
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2017-07-07 09:19:42 -05:00
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2019-07-17 20:36:52 -05:00
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2019-07-17 20:36:47 -05:00
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objtool: Add --backtrace support
For when you want to know the path that reached your fail state:
$ ./objtool check --no-fp --backtrace arch/x86/lib/usercopy_64.o
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0x3: UACCESS disable without MEMOPs: __clear_user()
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x3a: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x2e: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x18: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0xffffffffffffffff: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x5: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x0: <=== (func)
0000000000000000 <__clear_user>:
0: e8 00 00 00 00 callq 5 <__clear_user+0x5>
1: R_X86_64_PLT32 __fentry__-0x4
5: 90 nop
6: 90 nop
7: 90 nop
8: 48 89 f0 mov %rsi,%rax
b: 48 c1 ee 03 shr $0x3,%rsi
f: 83 e0 07 and $0x7,%eax
12: 48 89 f1 mov %rsi,%rcx
15: 48 85 c9 test %rcx,%rcx
18: 74 0f je 29 <__clear_user+0x29>
1a: 48 c7 07 00 00 00 00 movq $0x0,(%rdi)
21: 48 83 c7 08 add $0x8,%rdi
25: ff c9 dec %ecx
27: 75 f1 jne 1a <__clear_user+0x1a>
29: 48 89 c1 mov %rax,%rcx
2c: 85 c9 test %ecx,%ecx
2e: 74 0a je 3a <__clear_user+0x3a>
30: c6 07 00 movb $0x0,(%rdi)
33: 48 ff c7 inc %rdi
36: ff c9 dec %ecx
38: 75 f6 jne 30 <__clear_user+0x30>
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 48 89 c8 mov %rcx,%rax
40: c3 retq
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-03-01 11:15:49 +01:00
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2017-07-07 09:19:42 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:57 -05:00
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2019-07-17 20:36:52 -05:00
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2019-03-06 12:58:15 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:57 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2017-06-28 10:11:07 -05:00
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2017-08-10 16:37:25 -05:00
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2017-06-28 10:11:07 -05:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:47 -05:00
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2019-02-25 12:50:09 +01:00
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2017-06-28 10:11:07 -05:00
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2019-02-25 11:10:55 +01:00
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2019-07-17 20:36:47 -05:00
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2019-02-25 11:10:55 +01:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-09-18 21:43:30 -05:00
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2017-06-28 10:11:05 -05:00
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2017-09-18 21:43:30 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2019-07-17 20:36:47 -05:00
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objtool: Add --backtrace support
For when you want to know the path that reached your fail state:
$ ./objtool check --no-fp --backtrace arch/x86/lib/usercopy_64.o
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0x3: UACCESS disable without MEMOPs: __clear_user()
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x3a: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x2e: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x18: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0xffffffffffffffff: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x5: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x0: <=== (func)
0000000000000000 <__clear_user>:
0: e8 00 00 00 00 callq 5 <__clear_user+0x5>
1: R_X86_64_PLT32 __fentry__-0x4
5: 90 nop
6: 90 nop
7: 90 nop
8: 48 89 f0 mov %rsi,%rax
b: 48 c1 ee 03 shr $0x3,%rsi
f: 83 e0 07 and $0x7,%eax
12: 48 89 f1 mov %rsi,%rcx
15: 48 85 c9 test %rcx,%rcx
18: 74 0f je 29 <__clear_user+0x29>
1a: 48 c7 07 00 00 00 00 movq $0x0,(%rdi)
21: 48 83 c7 08 add $0x8,%rdi
25: ff c9 dec %ecx
27: 75 f1 jne 1a <__clear_user+0x1a>
29: 48 89 c1 mov %rax,%rcx
2c: 85 c9 test %ecx,%ecx
2e: 74 0a je 3a <__clear_user+0x3a>
30: c6 07 00 movb $0x0,(%rdi)
33: 48 ff c7 inc %rdi
36: ff c9 dec %ecx
38: 75 f6 jne 30 <__clear_user+0x30>
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 48 89 c8 mov %rcx,%rax
40: c3 retq
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-03-01 11:15:49 +01:00
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2017-07-11 10:33:43 -05:00
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2018-01-16 10:24:06 +01:00
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2018-01-31 10:18:28 +01:00
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2018-01-16 10:24:06 +01:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-07-27 15:56:54 -05:00
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2017-06-28 10:11:07 -05:00
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2017-07-27 15:56:54 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2018-02-08 17:09:25 -06:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2018-02-08 17:09:25 -06:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:48 -05:00
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2019-07-17 20:36:49 -05:00
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2019-07-17 20:36:48 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:47 -05:00
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2017-06-28 10:11:05 -05:00
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2019-07-17 20:36:48 -05:00
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2019-02-25 12:50:09 +01:00
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2019-07-17 20:36:47 -05:00
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|
objtool: Add --backtrace support
For when you want to know the path that reached your fail state:
$ ./objtool check --no-fp --backtrace arch/x86/lib/usercopy_64.o
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0x3: UACCESS disable without MEMOPs: __clear_user()
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x3a: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x2e: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x18: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: .altinstr_replacement+0xffffffffffffffff: (branch)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x5: (alt)
arch/x86/lib/usercopy_64.o: warning: objtool: __clear_user()+0x0: <=== (func)
0000000000000000 <__clear_user>:
0: e8 00 00 00 00 callq 5 <__clear_user+0x5>
1: R_X86_64_PLT32 __fentry__-0x4
5: 90 nop
6: 90 nop
7: 90 nop
8: 48 89 f0 mov %rsi,%rax
b: 48 c1 ee 03 shr $0x3,%rsi
f: 83 e0 07 and $0x7,%eax
12: 48 89 f1 mov %rsi,%rcx
15: 48 85 c9 test %rcx,%rcx
18: 74 0f je 29 <__clear_user+0x29>
1a: 48 c7 07 00 00 00 00 movq $0x0,(%rdi)
21: 48 83 c7 08 add $0x8,%rdi
25: ff c9 dec %ecx
27: 75 f1 jne 1a <__clear_user+0x1a>
29: 48 89 c1 mov %rax,%rcx
2c: 85 c9 test %ecx,%ecx
2e: 74 0a je 3a <__clear_user+0x3a>
30: c6 07 00 movb $0x0,(%rdi)
33: 48 ff c7 inc %rdi
36: ff c9 dec %ecx
38: 75 f6 jne 30 <__clear_user+0x30>
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 48 89 c8 mov %rcx,%rax
40: c3 retq
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-03-01 11:15:49 +01:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2019-03-18 19:09:38 -05:00
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2018-01-16 17:16:32 +01:00
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2017-06-28 10:11:05 -05:00
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2019-07-10 16:20:11 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-24 18:34:14 -05:00
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2017-07-11 10:33:43 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2018-01-16 10:24:06 +01:00
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2017-06-28 10:11:07 -05:00
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2017-06-28 10:11:05 -05:00
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2017-07-11 10:33:43 -05:00
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2017-06-28 10:11:07 -05:00
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2017-07-11 10:33:42 -05:00
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2017-06-28 10:11:05 -05:00
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