proc: check permissions earlier for /proc/*/wchan

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get_wchan() accesses stack page before permissions are checked, let's
not play this game.

Link: http://lkml.kernel.org/r/20180217071923.GA16074@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Alexey Dobriyan 2018-04-10 16:31:30 -07:00 • committed by Linus Torvalds

parent d0f0223122

commit 24b2ec2119

1 changed files with 8 additions and 5 deletions

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fs/proc/base.c

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