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authorKees Cook <keescook@chromium.org>2012-10-19 13:56:51 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-28 10:56:10 -0700
commit53a976ad28154268b3474d9fa45283cc48ff97d4 (patch)
tree9916883afb0a4d627702e75c0e364e408bbb78fa /kernel/elfcore.c
parentc5d5a7c5acb92d444faad8a378a2c94a7afd7f6f (diff)
kernel/sys.c: fix stack memory content leak via UNAME26
commit 2702b1526c7278c4d65d78de209a465d4de2885e upstream. 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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/elfcore.c')
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