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23 October 2021, 00:29:24 UTC
Revision 2702b1526c7278c4d65d78de209a465d4de2885e authored by Kees Cook on 19 October 2012, 20:56:51 UTC, committed by Linus Torvalds on 19 October 2012, 21:07:47 UTC 
kernel/sys.c: fix stack memory content leak via UNAME26
 
Calling uname() with the UNAME26 personality set allows a leak of kernel
stack contents.  This fixes it by defensively calculating the length of
copy_to_user() call, making the len argument unsigned, and initializing
the stack buffer to zero (now technically unneeded, but hey, overkill).

CVE-2012-0957

Reported-by: PaX Team <pageexec@freemail.hu>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 1d46e23
History
Tip revision: 2702b1526c7278c4d65d78de209a465d4de2885e authored by Kees Cook on 19 October 2012, 20:56:51 UTC
kernel/sys.c: fix stack memory content leak via UNAME26
Tip revision: 2702b15
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