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| author | Kees Cook <keescook@chromium.org> | 2012-10-19 13:56:51 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-28 10:02:11 -0700 |
| commit | 58793e9b6ba06d22ce9cf444d190568157c858c9 (patch) | |
| tree | 35f1f0bf217fdc7e9daa1162654a21be0a87c4fd /kernel/Kconfig.hz | |
| parent | 7b48126837ed4804b9f6c1807a21d803cc35172d (diff) | |
| download | lwn-58793e9b6ba06d22ce9cf444d190568157c858c9.tar.gz lwn-58793e9b6ba06d22ce9cf444d190568157c858c9.zip | |
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/Kconfig.hz')
0 files changed, 0 insertions, 0 deletions