seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO
authorKees Cook <keescook@chromium.org>
Tue, 17 Feb 2015 21:48:00 +0000 (13:48 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 17 Feb 2015 22:34:55 +0000 (14:34 -0800)
commit580c57f1076872ebc2427f898b927944ce170f2d
treeae0b2110dbe5eeaf98778001bb1d320797c84140
parent3a9af0bd34410a255d27024ea1bc28dc4e3a0044
seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO

The value resulting from the SECCOMP_RET_DATA mask could exceed MAX_ERRNO
when setting errno during a SECCOMP_RET_ERRNO filter action.  This makes
sure we have a reliable value being set, so that an invalid errno will not
be ignored by userspace.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Will Drewry <wad@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/seccomp.c