releases/4.19.36/sched-core-fix-buffer-overflow-in-cgroup2-property-c.patch

   1 From d6a0bb333aa3878ba1f85cb0b37f32465a8b39cb Mon Sep 17 00:00:00 2001
   2 From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
   3 Date: Wed, 6 Mar 2019 20:11:42 +0300
   4 Subject: sched/core: Fix buffer overflow in cgroup2 property cpu.max
   5
   6 [ Upstream commit 4c47acd824aaaa8fc6dc519fb4e08d1522105b7a ]
   7
   8 Add limit into sscanf format string for on-stack buffer.
   9
  10 Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
  11 Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
  12 Acked-by: Tejun Heo <tj@kernel.org>
  13 Cc: Andy Lutomirski <luto@kernel.org>
  14 Cc: Borislav Petkov <bp@alien8.de>
  15 Cc: Dave Hansen <dave.hansen@linux.intel.com>
  16 Cc: H. Peter Anvin <hpa@zytor.com>
  17 Cc: Johannes Weiner <hannes@cmpxchg.org>
  18 Cc: Li Zefan <lizefan@huawei.com>
  19 Cc: Linus Torvalds <torvalds@linux-foundation.org>
  20 Cc: Peter Zijlstra <peterz@infradead.org>
  21 Cc: Rik van Riel <riel@surriel.com>
  22 Cc: Thomas Gleixner <tglx@linutronix.de>
  23 Fixes: 0d5936344f30 ("sched: Implement interface for cgroup unified hierarchy")
  24 Link: https://lkml.kernel.org/r/155189230232.2620.13120481613524200065.stgit@buzz
  25 Signed-off-by: Ingo Molnar <mingo@kernel.org>
  26 Signed-off-by: Sasha Levin <sashal@kernel.org>
  27 ---
  28  kernel/sched/core.c | 2 +-
  29  1 file changed, 1 insertion(+), 1 deletion(-)
  30
  31 diff --git a/kernel/sched/core.c b/kernel/sched/core.c
  32 index 9a4f57d7e931..d7f409866cdf 100644
  33 --- a/kernel/sched/core.c
  34 +++ b/kernel/sched/core.c
  35 @@ -6930,7 +6930,7 @@ static int __maybe_unused cpu_period_quota_parse(char *buf,
  36  {
  37         char tok[21];   /* U64_MAX */
  38
  39 -       if (!sscanf(buf, "%s %llu", tok, periodp))
  40 +       if (sscanf(buf, "%20s %llu", tok, periodp) < 1)
  41                 return -EINVAL;
  42
  43         *periodp *= NSEC_PER_USEC;
  44 --
  45 2.19.1
  46