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author | Rabin Vincent <rabin@rab.in> | 2014-10-29 23:06:58 +0100 |
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committer | Simon Shields <keepcalm444@gmail.com> | 2016-03-15 17:48:00 +1100 |
commit | f14deb73188f99142fb1ffcaf564613674349989 (patch) | |
tree | 49578421dbc231653611a6e88fbd077768ed17a4 /kernel/groups.c | |
parent | c2710a162474f0fba1018167499c3c5b4a5e4ce7 (diff) | |
download | kernel_samsung_smdk4412-f14deb73188f99142fb1ffcaf564613674349989.zip kernel_samsung_smdk4412-f14deb73188f99142fb1ffcaf564613674349989.tar.gz kernel_samsung_smdk4412-f14deb73188f99142fb1ffcaf564613674349989.tar.bz2 |
tracing/syscalls: Ignore numbers outside NR_syscalls' range
ARM has some private syscalls (for example, set_tls(2)) which lie
outside the range of NR_syscalls. If any of these are called while
syscall tracing is being performed, out-of-bounds array access will
occur in the ftrace and perf sys_{enter,exit} handlers.
# trace-cmd record -e raw_syscalls:* true && trace-cmd report
...
true-653 [000] 384.675777: sys_enter: NR 192 (0, 1000, 3, 4000022, ffffffff, 0)
true-653 [000] 384.675812: sys_exit: NR 192 = 1995915264
true-653 [000] 384.675971: sys_enter: NR 983045 (76f74480, 76f74000, 76f74b28, 76f74480, 76f76f74, 1)
true-653 [000] 384.675988: sys_exit: NR 983045 = 0
...
# trace-cmd record -e syscalls:* true
[ 17.289329] Unable to handle kernel paging request at virtual address aaaaaace
[ 17.289590] pgd = 9e71c000
[ 17.289696] [aaaaaace] *pgd=00000000
[ 17.289985] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 17.290169] Modules linked in:
[ 17.290391] CPU: 0 PID: 704 Comm: true Not tainted 3.18.0-rc2+ #21
[ 17.290585] task: 9f4dab00 ti: 9e710000 task.ti: 9e710000
[ 17.290747] PC is at ftrace_syscall_enter+0x48/0x1f8
[ 17.290866] LR is at syscall_trace_enter+0x124/0x184
Fix this by ignoring out-of-NR_syscalls-bounds syscall numbers.
Commit cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
added the check for less than zero, but it should have also checked
for greater than NR_syscalls.
Link: http://lkml.kernel.org/p/1414620418-29472-1-git-send-email-rabin@rab.in
Fixes: cd0980fc8add "tracing: Check invalid syscall nr while tracing syscalls"
Cc: stable@vger.kernel.org # 2.6.33+
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Conflicts:
kernel/trace/trace_syscalls.c
Change-Id: I512142f8f1e1b2a8dc063209666dbce9737377e7
Diffstat (limited to 'kernel/groups.c')
0 files changed, 0 insertions, 0 deletions