Rabin Vincent b767a16393 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 cd0980fc8a "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: cd0980fc8a "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> Change-Id: I512142f8f1e1b2a8dc063209666dbce9737377e7		2016-10-29 23:12:11 +08:00
..
blktrace.c	block: ioctl support for sanitize in eMMC 4.5	2013-02-20 01:32:26 -08:00
ftrace.c	ftrace: Fix function_graph for archs that test ftrace_trace_function	2012-03-13 15:07:37 -04:00
gpu-traces.c	trace/events: add gpu trace events	2013-04-18 16:08:19 -07:00
Kconfig	trace/events: add gpu trace events	2013-04-18 16:08:19 -07:00
Makefile	trace/events: add gpu trace events	2013-04-18 16:08:19 -07:00
power-traces.c
ring_buffer.c	tracing/ring-buffer: Only have tracing_on disable tracing buffers	2012-02-22 15:50:28 -05:00
ring_buffer_benchmark.c
rpm-traces.c
trace.c	kernel: trace.c: Initialize page2 to prevent compiler error	2013-02-20 01:32:27 -08:00
trace.h	tracing: Fix build breakage without CONFIG_PERF_EVENTS (again)	2012-04-13 21:37:04 -04:00
trace_branch.c
trace_clock.c
trace_cpu_freq_switch.c	trace: cpu_freq_switch: Add profiler for CPU frequency switch times	2013-02-08 15:14:30 -08:00
trace_entries.h	Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/urgent	2012-03-24 08:19:09 +01:00
trace_event_perf.c	msm: null pointer dereferencing	2016-01-21 15:15:08 -08:00
trace_events.c	tracing: Do not enable function event with enable	2012-05-10 15:55:43 -04:00
trace_events_filter.c	tracing/filter: Correct potential uninitialized variable	2013-02-08 15:14:34 -08:00
trace_events_filter_test.h
trace_export.c	tracing: Do not enable function event with enable	2012-05-10 15:55:43 -04:00
trace_functions.c
trace_functions_graph.c
trace_irqsoff.c
trace_kdb.c
trace_kprobe.c	ftrace, perf: Add add/del tracepoint perf registration actions	2012-02-21 11:08:25 -05:00
trace_mmiotrace.c
trace_nop.c
trace_output.c	tracing: Fix stacktrace of latency tracers (irqsoff and friends)	2012-04-19 17:00:13 -04:00
trace_output.h
trace_printk.c
trace_sched_switch.c
trace_sched_wakeup.c
trace_selftest.c
trace_selftest_dynamic.c
trace_stack.c
trace_stat.c
trace_stat.h
trace_syscalls.c	tracing/syscalls: Ignore numbers outside NR_syscalls' range	2016-10-29 23:12:11 +08:00
trace_workqueue.c