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linux/arch/s390/kernel
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Vasily Gorbik 6047980008 s390/disassembler: increase show_code buffer size 
commit b192571d1a upstream.

Current buffer size of 64 is too small. objdump shows that there are
instructions which would require up to 75 bytes buffer (with current
formating). 128 bytes "ought to be enough for anybody".

Also replaces 8 spaces with a single tab to reduce the memory footprint.

Fixes the following KASAN finding:

BUG: KASAN: stack-out-of-bounds in number+0x3fe/0x538
Write of size 1 at addr 000000005a4a75a0 by task bash/1282

CPU: 1 PID: 1282 Comm: bash Not tainted 4.14.0+ #215
Hardware name: IBM 2964 N96 702 (z/VM 6.4.0)
Call Trace:
([<000000000011eeb6>] show_stack+0x56/0x88)
 [<0000000000e1ce1a>] dump_stack+0x15a/0x1b0
 [<00000000004e2994>] print_address_description+0xf4/0x288
 [<00000000004e2cf2>] kasan_report+0x13a/0x230
 [<0000000000e38ae6>] number+0x3fe/0x538
 [<0000000000e3dfe4>] vsnprintf+0x194/0x948
 [<0000000000e3ea42>] sprintf+0xa2/0xb8
 [<00000000001198dc>] print_insn+0x374/0x500
 [<0000000000119346>] show_code+0x4ee/0x538
 [<000000000011f234>] show_registers+0x34c/0x388
 [<000000000011f2ae>] show_regs+0x3e/0xa8
 [<000000000011f502>] die+0x1ea/0x2e8
 [<0000000000138f0e>] do_no_context+0x106/0x168
 [<0000000000139a1a>] do_protection_exception+0x4da/0x7d0
 [<0000000000e55914>] pgm_check_handler+0x16c/0x1c0
 [<000000000090639e>] sysrq_handle_crash+0x46/0x58
([<0000000000000007>] 0x7)
 [<00000000009073fa>] __handle_sysrq+0x102/0x218
 [<0000000000907c06>] write_sysrq_trigger+0xd6/0x100
 [<000000000061d67a>] proc_reg_write+0xb2/0x128
 [<0000000000520be6>] __vfs_write+0xee/0x368
 [<0000000000521222>] vfs_write+0x21a/0x278
 [<000000000052156a>] SyS_write+0xda/0x178
 [<0000000000e555cc>] system_call+0xc4/0x270

The buggy address belongs to the page:
page:000003d1016929c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x0()
raw: 0000000000000000 0000000000000000 0000000000000000 ffffffff00000000
raw: 0000000000000100 0000000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 000000005a4a7480: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 000000005a4a7500: 00 00 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 00
>000000005a4a7580: 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00
                               ^
 000000005a4a7600: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f8 f8
 000000005a4a7680: f2 f2 f2 f2 f2 f2 f8 f8 f2 f2 f3 f3 f3 f3 00 00
==================================================================

Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2017-11-30 08:40:38 +00:00
..
vdso32 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso64 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
.gitignore s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
als.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
asm-offsets.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
audit.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
base.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_linux.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_linux.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_ptrace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_signal.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_wrapper.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpcmd.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crash_dump.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debug.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
diag.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dis.c s390/disassembler: increase show_code buffer size 2017-11-30 08:40:38 +00:00
dumpstack.c s390/mm: use new mm defines instead of magic values 2017-07-26 08:25:09 +02:00
early.c s390: fix transactional execution control register handling 2017-11-30 08:40:38 +00:00
early_printk.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ebcdic.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
entry.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
entry.S License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
fpu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ftrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
guarded_storage.c s390/guarded storage: fix possible memory corruption 2017-11-30 08:40:38 +00:00
head.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head64.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head_kdump.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idle.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ipl.c s390/ipl: revert Load Normal semantics for LPAR CCW-type re-IPL 2017-06-14 15:35:31 +02:00
irq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jump_label.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
kdebugfs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
kprobes.c s390: Prevent hotplug rwsem recursion 2017-05-26 10:10:46 +02:00
lgr.c s390: kernel: make lgr explicitly non-modular 2016-10-31 17:55:42 +01:00
machine_kexec.c s390/noexec: execute kexec datamover without DAT 2017-11-30 08:40:38 +00:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mcount.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c s390: add no-execute support 2017-02-08 14:13:25 +01:00
nmi.c KVM: s390: Backup the guest's machine check info 2017-06-27 16:05:38 +02:00
os_info.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf_cpum_cf.c s390/cpum_cf: make hw_perf_event_update() a void function 2017-03-31 07:53:35 +02:00
perf_cpum_cf_events.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf_cpum_sf.c s390/perf: fix bug when creating per-thread event 2017-09-13 16:34:23 +02:00
perf_event.c s390/perf: fix null string in perf list pmu command 2017-06-12 16:26:00 +02:00
pgm_check.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
process.c s390: fix transactional execution control register handling 2017-11-30 08:40:38 +00:00
processor.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ptrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
reipl.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
relocate_kernel.S s390/noexec: execute kexec datamover without DAT 2017-11-30 08:40:38 +00:00
runtime_instr.c s390/runtime instrumention: fix possible memory corruption 2017-11-30 08:40:38 +00:00
setup.c s390/vmcp: make use of contiguous memory allocator 2017-08-09 09:09:35 -04:00
signal.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
stacktrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
suspend.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
swsusp.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_s390.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscalls.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysinfo.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
time.c s390/dasd: Change unsigned long long to unsigned long 2017-08-23 13:31:51 +02:00
topology.c s390/topology: enable / disable topology dynamically 2017-09-20 13:47:55 +02:00
trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
traps.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uprobes.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso.c s390/mm: tag normal pages vs pages used in page tables 2017-07-25 06:55:28 +02:00
vmlinux.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vtime.c s390/cputime: simplify account_system_index_scaled 2017-06-12 16:25:57 +02:00