diff options
| author | Jiri Olsa | 2017-06-29 11:38:11 +0200 |
|---|---|---|
| committer | Martin Schwidefsky | 2017-07-05 07:35:30 +0200 |
| commit | c46fc0424ced3fb71208e72bd597d91b9169a781 (patch) | |
| tree | 3a1afec55c72563a63af08431270c6814a9a9979 /COPYING | |
| parent | c14b7a85be8f9f2c3faba45ddf47e851feb1c27c (diff) | |
s390/syscalls: Fix out of bounds arguments access
Zorro reported following crash while having enabled
syscall tracing (CONFIG_FTRACE_SYSCALLS):
Unable to handle kernel pointer dereference at virtual ...
Oops: 0011 [#1] SMP DEBUG_PAGEALLOC
SNIP
Call Trace:
([<000000000024d79c>] ftrace_syscall_enter+0xec/0x1d8)
[<00000000001099c6>] do_syscall_trace_enter+0x236/0x2f8
[<0000000000730f1c>] sysc_tracesys+0x1a/0x32
[<000003fffcf946a2>] 0x3fffcf946a2
INFO: lockdep is turned off.
Last Breaking-Event-Address:
[<000000000022dd44>] rb_event_data+0x34/0x40
---[ end trace 8c795f86b1b3f7b9 ]---
The crash happens in syscall_get_arguments function for
syscalls with zero arguments, that will try to access
first argument (args[0]) in event entry, but it's not
allocated.
Bail out of there are no arguments.
Cc: stable@vger.kernel.org
Reported-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions