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authorDavid Rientjes <rientjes@google.com>2018-04-05 16:25:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 21:36:27 -0700
commitd46078b2888947a86b6bb997cd5927e602e8fdc9 (patch)
tree84c5dedfbf534274212214e7f3c31af8a69547e7 /fs/open.c
parent5ecd9d403ad081ed2de7b118c1e96124d4e0ba6c (diff)
downloadlinux-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>
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