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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2012-05-10 10:04:36 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-21 09:40:04 -0700 |
| commit | 5c17daa89308cc028fe336af58cf9d4e4d83298d (patch) | |
| tree | f42c055ed6faeb2af7262e735b997d6ef437a416 /fs | |
| parent | 37de6be49f6c88f7d1306594b7aae5aeee2fa499 (diff) | |
compat: Fix RT signal mask corruption via sigprocmask
commit b7dafa0ef3145c31d7753be0a08b3cbda51f0209 upstream.
compat_sys_sigprocmask reads a smaller signal mask from userspace than
sigprogmask accepts for setting. So the high word of blocked.sig[0]
will be cleared, releasing any potentially blocked RT signal.
This was discovered via userspace code that relies on get/setcontext.
glibc's i386 versions of those functions use sigprogmask instead of
rt_sigprogmask to save/restore signal mask and caused RT signal
unblocking this way.
As suggested by Linus, this replaces the sys_sigprocmask based compat
version with one that open-codes the required logic, including the merge
of the existing blocked set with the new one provided on SIG_SETMASK.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions