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| author | Amanieu d'Antras <amanieu@gmail.com> | 2015-08-06 15:46:33 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-16 20:51:51 -0700 |
| commit | fda4653f0dd865a7d54ad53825cc74e15b75f70d (patch) | |
| tree | 0d2eb4ab5f2400b39093a460ddb31648e5251a46 /arch | |
| parent | 08ac1787579cb8bd9e7333836269e76801905597 (diff) | |
signalfd: fix information leak in signalfd_copyinfo
commit 3ead7c52bdb0ab44f4bb1feed505a8323cc12ba7 upstream.
This function may copy the si_addr_lsb field to user mode when it hasn't
been initialized, which can leak kernel stack data to user mode.
Just checking the value of si_code is insufficient because the same
si_code value is shared between multiple signals. This is solved by
checking the value of si_signo in addition to si_code.
Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
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 'arch')
0 files changed, 0 insertions, 0 deletions