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author | David Rientjes <rientjes@google.com> | 2018-04-05 16:25:19 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-05 21:36:27 -0700 |
commit | d46078b2888947a86b6bb997cd5927e602e8fdc9 (patch) | |
tree | 84c5dedfbf534274212214e7f3c31af8a69547e7 /kernel/reboot.c | |
parent | 5ecd9d403ad081ed2de7b118c1e96124d4e0ba6c (diff) | |
download | linux-d46078b2888947a86b6bb997cd5927e602e8fdc9.tar.bz2 |
mm, oom: remove 3% bonus for CAP_SYS_ADMIN processes
Since the 2.6 kernel, the oom killer has slightly biased away from
CAP_SYS_ADMIN processes by discounting some of its memory usage in
comparison to other processes.
This has always been implicit and nothing exactly relies on the
behavior.
Gaurav notices that __task_cred() can dereference a potentially freed
pointer if the task under consideration is exiting because a reference
to the task_struct is not held.
Remove the CAP_SYS_ADMIN bias so that all processes are treated equally.
If any CAP_SYS_ADMIN process would like to be biased against, it is
always allowed to adjust /proc/pid/oom_score_adj.
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1803071548510.6996@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Reported-by: Gaurav Kohli <gkohli@codeaurora.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/reboot.c')
0 files changed, 0 insertions, 0 deletions