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author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2014-07-22 12:20:01 (GMT) |
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committer | James Morris <james.l.morris@oracle.com> | 2014-07-24 11:12:30 (GMT) |
commit | 6d6f3328422a3bc56b0d8dd026a5de845d2abfa7 (patch) | |
tree | 51c24037355a91d098568a88f7dd9715dee8008c /security/integrity/ima/Kconfig | |
parent | fd33c43677a7965624b46352a686a7c1e72ae4aa (diff) | |
download | linux-6d6f3328422a3bc56b0d8dd026a5de845d2abfa7.tar.xz |
commoncap: don't alloc the credential unless needed in cap_task_prctl
In function cap_task_prctl(), we would allocate a credential
unconditionally and then check if we support the requested function.
If not we would release this credential with abort_creds() by using
RCU method. But on some archs such as powerpc, the sys_prctl is heavily
used to get/set the floating point exception mode. So the unnecessary
allocating/releasing of credential not only introduce runtime overhead
but also do cause OOM due to the RCU implementation.
This patch removes abort_creds() from cap_task_prctl() by calling
prepare_creds() only when we need to modify it.
Reported-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Paul Moore <paul@paul-moore.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'security/integrity/ima/Kconfig')
0 files changed, 0 insertions, 0 deletions