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| author | Usama Arif <usama.arif@linux.dev> | 2026-06-16 07:15:17 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-06-16 10:07:36 -0600 |
| commit | fd38b75c4b43295b10d69772a46d1c74dbd6fc81 (patch) | |
| tree | 3e928518f8bb8e474c588e6f0bf585b55d512bab /kernel | |
| parent | 9cbbac29d752fb5d95e375fa3685a359b89caa0a (diff) | |
| download | linux-next-fd38b75c4b43295b10d69772a46d1c74dbd6fc81.tar.gz linux-next-fd38b75c4b43295b10d69772a46d1c74dbd6fc81.zip | |
kernel/fork: clear PF_BLOCK_TS in copy_process()
PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is
non-NULL, and blk_finish_plug() clears it via __blk_flush_plug()
before NULLing the plug pointer. copy_process() breaks the
invariant by inheriting PF_BLOCK_TS from the parent while resetting
the child's plug to NULL.
Clear PF_BLOCK_TS alongside that assignment so callers can rely on
"PF_BLOCK_TS set implies current->plug != NULL" and dereference
current->plug unguarded.
Fixes: 06b23f92af87 ("block: update cached timestamp post schedule/preemption")
Cc: stable@vger.kernel.org
Signed-off-by: Usama Arif <usama.arif@linux.dev>
Link: https://patch.msgid.link/20260616141604.328820-2-usama.arif@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/fork.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index addc555a1077..1fafcb9bb047 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2337,6 +2337,7 @@ __latent_entropy struct task_struct *copy_process( #ifdef CONFIG_BLOCK p->plug = NULL; + p->flags &= ~PF_BLOCK_TS; #endif futex_init_task(p); |