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FROMLIST: 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.

Reviewed-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Bug: 178507149
Link: https://lore.kernel.org/linux-arch/20201208132835.6151-10-will@kernel.org/
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Iadedd637c253cccfeb5fa4098afb2048bbfa6cc3
This commit is contained in:
Will Deacon
2020-11-12 17:04:20 +00:00
committed by Will Deacon
parent 4045a05f88
commit 50844622e6
1 changed files with 4 additions and 0 deletions
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4
kernel/sched/core.c
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@@ -1928,6 +1928,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
const struct cpumask *new_mask, bool check)
{
const struct cpumask *cpu_valid_mask = cpu_active_mask;
const struct cpumask *cpu_allowed_mask = task_cpu_possible_mask(p);
unsigned int dest_cpu;
struct rq_flags rf;
struct rq *rq;
@@ -1941,6 +1942,9 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
* Kernel threads are allowed on online && !active CPUs
*/
cpu_valid_mask = cpu_online_mask;
} else if (!cpumask_subset(new_mask, cpu_allowed_mask)) {
ret = -EINVAL;
goto out;
}
/*