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authorPeter Zijlstra <peterz@infradead.org>2015-05-15 17:43:34 +0200
committerIngo Molnar <mingo@kernel.org>2015-08-12 12:06:09 +0200
commit25834c73f93af7f0712c98ca4593691592e6b360 (patch)
tree5da4f7c4da2a85ba6458a4de234da5e3d0a0c27a /include/linux/sched.h
parent7855a35ac07a350e2cd26f09568a6d8e372be358 (diff)
downloadop-kernel-dev-25834c73f93af7f0712c98ca4593691592e6b360.zip
op-kernel-dev-25834c73f93af7f0712c98ca4593691592e6b360.tar.gz
sched: Fix a race between __kthread_bind() and sched_setaffinity()
Because sched_setscheduler() checks p->flags & PF_NO_SETAFFINITY without locks, a caller might observe an old value and race with the set_cpus_allowed_ptr() call from __kthread_bind() and effectively undo it: __kthread_bind() do_set_cpus_allowed() <SYSCALL> sched_setaffinity() if (p->flags & PF_NO_SETAFFINITIY) set_cpus_allowed_ptr() p->flags |= PF_NO_SETAFFINITY Fix the bug by putting everything under the regular scheduler locks. This also closes a hole in the serialization of task_struct::{nr_,}cpus_allowed. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Tejun Heo <tj@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: dedekind1@gmail.com Cc: juri.lelli@arm.com Cc: mgorman@suse.de Cc: riel@redhat.com Cc: rostedt@goodmis.org Link: http://lkml.kernel.org/r/20150515154833.545640346@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h7
1 files changed, 0 insertions, 7 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 44dca5b..81bb457 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2203,13 +2203,6 @@ static inline void calc_load_enter_idle(void) { }
static inline void calc_load_exit_idle(void) { }
#endif /* CONFIG_NO_HZ_COMMON */
-#ifndef CONFIG_CPUMASK_OFFSTACK
-static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
-{
- return set_cpus_allowed_ptr(p, &new_mask);
-}
-#endif
-
/*
* Do not use outside of architecture code which knows its limitations.
*
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