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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 03:43:32 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 03:43:32 +0000 |
| commit | f530fbb7a18f2794e4178dfb7cd07719b9586147 (patch) | |
| tree | 3f704b17427743e26452771cf7da2ed110346ddd /kernel/livepatch/transition.c | |
| parent | Adding debian version 4.19.260-1. (diff) | |
| download | linux-f530fbb7a18f2794e4178dfb7cd07719b9586147.tar.xz linux-f530fbb7a18f2794e4178dfb7cd07719b9586147.zip | |
Merging upstream version 4.19.269.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'kernel/livepatch/transition.c')
| -rw-r--r-- | kernel/livepatch/transition.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index 5bc349805..20277ad6b 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -563,9 +563,23 @@ void klp_reverse_transition(void) /* Called from copy_process() during fork */ void klp_copy_process(struct task_struct *child) { - child->patch_state = current->patch_state; - /* TIF_PATCH_PENDING gets copied in setup_thread_stack() */ + /* + * The parent process may have gone through a KLP transition since + * the thread flag was copied in setup_thread_stack earlier. Bring + * the task flag up to date with the parent here. + * + * The operation is serialized against all klp_*_transition() + * operations by the tasklist_lock. The only exception is + * klp_update_patch_state(current), but we cannot race with + * that because we are current. + */ + if (test_tsk_thread_flag(current, TIF_PATCH_PENDING)) + set_tsk_thread_flag(child, TIF_PATCH_PENDING); + else + clear_tsk_thread_flag(child, TIF_PATCH_PENDING); + + child->patch_state = current->patch_state; } /* |