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sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()

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If a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids
range) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel
crash.

To prevent this, validate prev_cpu in scx_bpf_select_cpu_dfl() and
trigger an scx error if an invalid CPU is specified.

Fixes: f0e1a0643a ("sched_ext: Implement BPF extensible scheduler class")
Cc: stable@vger.kernel.org # v6.12+
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Andrea Righi 2025-03-03 18:51:59 +01:00 committed by Tejun Heo
parent 8fef0a3b17
commit 9360dfe4cb
1 changed files with 3 additions and 0 deletions
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3
kernel/sched/ext.c
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@ -6422,6 +6422,9 @@ static bool check_builtin_idle_enabled(void)
__bpf_kfunc s32 scx_bpf_select_cpu_dfl(struct task_struct *p, s32 prev_cpu,
u64 wake_flags, bool *is_idle)
{
if (!ops_cpu_valid(prev_cpu, NULL))
goto prev_cpu;
if (!check_builtin_idle_enabled())
goto prev_cpu;