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| author | Andrea Righi <arighi@nvidia.com> | 2025-03-03 18:51:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-22 12:54:25 -0700 |
| commit | 752b56bb76e2471197d25d6948d85753043b10da (patch) | |
| tree | 214ae589fd59abff849c7fecb9a9dbbe262b1b3a /kernel | |
| parent | 72833a339f1fee4339b88ce7067316b927dd2685 (diff) | |
| download | linux-752b56bb76e2471197d25d6948d85753043b10da.tar.gz linux-752b56bb76e2471197d25d6948d85753043b10da.tar.bz2 linux-752b56bb76e2471197d25d6948d85753043b10da.zip | |
sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()
commit 9360dfe4cbd62ff1eb8217b815964931523b75b3 upstream.
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: f0e1a0643a59b ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/ext.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 325fd5b9d471..e5cab54dfdd1 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -6052,6 +6052,9 @@ __bpf_kfunc_start_defs(); __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 (!static_branch_likely(&scx_builtin_idle_enabled)) { scx_ops_error("built-in idle tracking is disabled"); goto prev_cpu; |