sched_ext: Reject internal enq_flags in the dsq move kfuncs

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The dsq insert kfuncs reject __SCX_ENQ_INTERNAL_MASK bits in
scx_dsq_insert_preamble() instead of scx_vet_enq_flags(). A scheduler can
smuggle internal flags such as SCX_ENQ_CLEAR_OPSS through the dsq move
kfuncs and corrupt the dispatch protocol. Move the rejection into
scx_vet_enq_flags(). The vtime move wrapper OR'd the internal
SCX_ENQ_DSQ_PRIQ bit into enq_flags before the vet; the bit now goes in
inside scx_dsq_move() after the vet.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

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Tejun Heo 2026-08-03 11:00:57 -10:00

parent f82b16b8e8

commit 1fd50778b1

1 changed files with 13 additions and 8 deletions

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kernel/sched/ext/ext.c

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