--- /dev/null
+From abc07cd01c51fb54088c6bc8ee654d104a5ec7d9 Mon Sep 17 00:00:00 2001
+From: Rabin Vincent <rabin@rab.in>
+Date: Wed, 29 Oct 2014 23:06:58 +0100
+Subject: [PATCH] tracing/syscalls: Ignore numbers outside NR_syscalls' range
+
+commit 086ba77a6db00ed858ff07451bedee197df868c9 upstream.
+
+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.
+
+Fixes CVE-2014-7825 and CVE-2014-7826
+Upstream-Status: Backport
+
+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"
+Signed-off-by: Rabin Vincent <rabin@rab.in>
+Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
+Signed-off-by: Jiri Slaby <jslaby@suse.cz>
+Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
+---
+ kernel/trace/trace_syscalls.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
+index 559329d..d8ce71b 100644
+--- a/kernel/trace/trace_syscalls.c
++++ b/kernel/trace/trace_syscalls.c
+@@ -312,7 +312,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
+ int size;
+
+ syscall_nr = trace_get_syscall_nr(current, regs);
+- if (syscall_nr < 0)
++ if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
+ return;
+ if (!test_bit(syscall_nr, tr->enabled_enter_syscalls))
+ return;
+@@ -354,7 +354,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
+ int syscall_nr;
+
+ syscall_nr = trace_get_syscall_nr(current, regs);
+- if (syscall_nr < 0)
++ if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
+ return;
+ if (!test_bit(syscall_nr, tr->enabled_exit_syscalls))
+ return;
+@@ -557,7 +557,7 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
+ int size;
+
+ syscall_nr = trace_get_syscall_nr(current, regs);
+- if (syscall_nr < 0)
++ if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
+ return;
+ if (!test_bit(syscall_nr, enabled_perf_enter_syscalls))
+ return;
+@@ -631,7 +631,7 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
+ int size;
+
+ syscall_nr = trace_get_syscall_nr(current, regs);
+- if (syscall_nr < 0)
++ if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
+ return;
+ if (!test_bit(syscall_nr, enabled_perf_exit_syscalls))
+ return;
+--
+1.9.1
+
