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sched_ext: A fix for v6.14-rc6

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BPF schedulers could trigger a crash by passing in an invalid CPU to the
 helper scx_bpf_select_cpu_dfl(). Fix it by verifying input validity.
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Merge tag 'sched_ext-for-6.14-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

Pull sched_ext fix from Tejun Heo:
 "BPF schedulers could trigger a crash by passing in an invalid CPU to
  the scx_bpf_select_cpu_dfl() helper.

  Fix it by verifying input validity"

* tag 'sched_ext-for-6.14-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()
This commit is contained in:
Linus Torvalds 2025-03-12 11:52:04 -10:00
commit b7f94fcf55
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;