forked from rubenslte/android_kernel_samsung_msm8226
Tetsuo Handa
3b6881c286
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> (cherry picked from commit 6d6f3328422a3bc56b0d8dd026a5de845d2abfa7) Bug: 35074030 Test: Builds. Change-Id: Ic7b0d01f4c23328b134084a5585599883aed6345 Signed-off-by: Jorge Lucangeli Obes <jorgelo@google.com> Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>