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linux/drivers/misc
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Josh Poimboeuf db437e9854 objtool, lkdtm: Obfuscate the do_nothing() pointer 
[ Upstream commit 05026ea01e ]

If execute_location()'s memcpy of do_nothing() gets inlined and unrolled
by the compiler, it copies one word at a time:

    mov    0x0(%rip),%rax    R_X86_64_PC32    .text+0x1374
    mov    %rax,0x38(%rbx)
    mov    0x0(%rip),%rax    R_X86_64_PC32    .text+0x136c
    mov    %rax,0x30(%rbx)
    ...

Those .text references point to the middle of the function, causing
objtool to complain about their lack of ENDBR.

Prevent that by resolving the function pointer at runtime rather than
build time.  This fixes the following warning:

  drivers/misc/lkdtm/lkdtm.o: warning: objtool: execute_location+0x23: relocation to !ENDBR: .text+0x1378

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/30b9abffbddeb43c4f6320b1270fa9b4d74c54ed.1742852847.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/oe-kbuild-all/202503191453.uFfxQy5R-lkp@intel.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-02 07:50:56 +02:00
..
altera-stapl misc: add HAS_IOPORT dependencies 2023-05-29 15:05:00 +01:00
bcm-vk Char/Misc driver changes for 6.6-rc1 2023-09-01 09:53:54 -07:00
c2port driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
cardreader Revert "drivers/card_reader/rtsx_usb: Restore interrupt based detection" 2025-03-13 12:58:33 +01:00
cb710 cb710: avoid NULL pointer subtraction 2021-10-05 15:50:05 +02:00
cxl Char/Misc driver changes for 6.6-rc1 2023-09-01 09:53:54 -07:00
echo char: Replace HTTP links with HTTPS ones 2020-07-23 09:44:15 +02:00
eeprom eeprom: digsy_mtc: Make GPIO lookup table match the device 2025-03-13 12:58:37 +01:00
genwqe misc: genwqe: make class_genwqe a static const structure 2023-08-11 21:41:33 +02:00
ibmasm ibm: convert to ctime accessor functions 2023-07-13 10:28:02 +02:00
lis3lv02d misc: lis3lv02d_i2c: Fix regulators getting en-/dis-abled twice on suspend/resume 2024-04-03 15:28:43 +02:00
lkdtm objtool, lkdtm: Obfuscate the do_nothing() pointer 2025-05-02 07:50:56 +02:00
mchp_pci1xxxx misc: microchip: pci1xxxx: Fix incorrect IRQ status handling during ack 2025-05-02 07:50:49 +02:00
mei mei: me: add panther lake H DID 2025-05-02 07:50:48 +02:00
ocxl mmu_notifiers: rename invalidate_range notifier 2023-08-18 10:12:41 -07:00
pvpanic misc/pvpanic-pci: register attributes via pci_driver 2024-06-12 11:12:35 +02:00
sgi-gru misc: sgi-gru: Don't disable preemption in GRU driver 2024-11-08 16:28:21 +01:00
sgi-xp sgi-xp: simplify sysctl registration 2023-03-09 17:32:13 +01:00
ti-st misc: st_core: Do not call kfree_skb() under spin_lock_irqsave() 2023-11-20 11:59:26 +01:00
uacce uacce: vma_close clears q->qfrs when freeing qfrs 2023-05-31 19:00:26 +01:00
vmw_vmci VMCI: Fix use-after-free when removing resource in vmci_resource_remove() 2024-09-12 11:11:41 +02:00
ad525x_dpot-i2c.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
ad525x_dpot-spi.c spi: make remove callback a void function 2022-02-09 13:00:45 +00:00
ad525x_dpot.c misc: ad525x_dpot: Make ad_dpot_remove() return void 2021-10-13 14:35:37 +02:00
ad525x_dpot.h misc: ad525x_dpot: Make ad_dpot_remove() return void 2021-10-13 14:35:37 +02:00
apds990x.c misc: apds990x: Fix missing pm_runtime_disable() 2024-12-09 10:32:37 +01:00
apds9802als.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
atmel-ssc.c misc: atmel-ssc: Use devm_platform_get_and_ioremap_resource() 2023-08-04 15:38:45 +02:00
bh1770glc.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
cs5535-mfgpt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
ds1682.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
dummy-irq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
dw-xdata-pcie.c misc: Add Synopsys DesignWare xData IP driver 2021-04-05 13:15:52 +02:00
enclosure.c drivers: remove struct module * setting from struct class 2023-03-17 15:16:27 +01:00
fastrpc.c misc: fastrpc: Fix copy buffer page size 2025-02-17 09:40:39 +01:00
gehc-achc.c misc: gehc: Add SPI ID table 2021-10-05 15:47:18 +02:00
hi6421v600-irq.c misc: hi6421-spmi-pmic: Remove redundant dev_err() 2023-08-04 15:39:10 +02:00
hisi_hikey_usb.c misc: hisi_hikey_usb: change the DT schema 2021-09-14 10:57:31 +02:00
hmc6352.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
hpilo.c misc: hpilo: make ilo_class a static const structure 2023-08-11 21:41:36 +02:00
hpilo.h misc: hpilo: map iLO shared memory by PCI revision id 2021-06-04 15:28:23 +02:00
ibmvmc.c ibm: convert to ctime accessor functions 2023-07-13 10:28:02 +02:00
ibmvmc.h misc: Use the correct style for SPDX License Identifier 2019-10-10 15:34:40 +02:00
ics932s401.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
isl29003.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
isl29020.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
Kconfig misc: open-dice: make OPEN_DICE depend on HAS_IOMEM 2023-08-04 15:39:42 +02:00
kgdbts.c kgdbts: fix return value of __setup handler 2022-03-18 14:17:56 +01:00
lattice-ecp3-config.c spi: make remove callback a void function 2022-02-09 13:00:45 +00:00
Makefile misc: tps6594-pfsm: Add driver for TI TPS6594 PFSM 2023-06-15 13:41:53 +02:00
open-dice.c misc: open-dice: Fix spurious lockdep warning 2024-03-01 13:34:51 +01:00
pch_phub.c misc: pch_phub: Remove superfluous descriptions to non-existent args 'offset_address' 2020-07-01 15:05:37 +02:00
pci_endpoint_test.c misc: pci_endpoint_test: Fix 'irq_type' to convey the correct type 2025-04-25 10:45:55 +02:00
phantom.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
qcom-coincell.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
smpro-errmon.c misc: smpro-errmon: Remove the unneeded include <linux/i2c.h> 2023-05-31 19:00:10 +01:00
smpro-misc.c misc: smpro-misc: Add Ampere's Altra SMpro misc driver 2022-11-10 19:03:03 +01:00
sram-exec.c mm: Introduce set_memory_rox() 2022-12-15 10:37:26 -08:00
sram.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
sram.h misc: sram: Improve and simplify clk handling 2023-03-09 17:31:53 +01:00
tifm_7xx1.c misc: tifm: fix possible memory leak in tifm_7xx1_switch_media() 2022-11-23 19:55:26 +01:00
tifm_core.c driver core: make struct bus_type.uevent() take a const * 2023-01-27 13:45:52 +01:00
tps6594-esm.c Merge 6.5-rc6 into char-misc-next 2023-08-13 22:14:51 +02:00
tps6594-pfsm.c misc: tps6594: Remove redundant dev_err_probe() for platform_get_irq_byname() 2023-08-12 12:58:40 +02:00
tsl2550.c misc: Switch i2c drivers back to use .probe() 2023-05-29 15:04:52 +01:00
vcpu_stall_detector.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
vmw_balloon.c misc: vmw_balloon: fix memory leak with using debugfs_lookup() 2023-02-08 13:24:22 +01:00
xilinx_sdfec.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
xilinx_tmr_inject.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00
xilinx_tmr_manager.c misc: Explicitly include correct DT includes 2023-08-04 15:39:04 +02:00