sched: Reject CPU affinity changes based on task_cpu_possible_mask()

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Reject explicit requests to change the affinity mask of a task via
set_cpus_allowed_ptr() if the requested mask is not a subset of the
mask returned by task_cpu_possible_mask(). This ensures that the
'cpus_mask' for a given task cannot contain CPUs which are incapable of
executing it, except in cases where the affinity is forced.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <Valentin.Schneider@arm.com>
Reviewed-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20210730112443.23245-6-will@kernel.org

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Will Deacon 2021-07-30 12:24:32 +01:00 • committed by Peter Zijlstra

parent 97c0054dbe

commit 234a503e67

1 changed files with 8 additions and 1 deletions

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kernel/sched/core.c

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