aboutsummaryrefslogtreecommitdiff
path: root/include/linux/sched
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 19:36:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 19:36:48 -0800
commitd01e7f10dae29eba0f9ada82b65d24e035d5b2f9 (patch)
tree5f8260e02bf6290fe386337e4c66858eaf20340d /include/linux/sched
parentfaf145d6f3f3d6f2c066f65602ba9d0a03106915 (diff)
parentf7cfd871ae0c5008d94b6f66834e7845caa93c15 (diff)
downloadlinux-stericsson-d01e7f10dae29eba0f9ada82b65d24e035d5b2f9.tar.gz
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull exec-update-lock update from Eric Biederman: "The key point of this is to transform exec_update_mutex into a rw_semaphore so readers can be separated from writers. This makes it easier to understand what the holders of the lock are doing, and makes it harder to contend or deadlock on the lock. The real deadlock fix wound up in perf_event_open" * 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: exec: Transform exec_update_mutex into a rw_semaphore
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/signal.h11
1 files changed, 6 insertions, 5 deletions
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index bd5afa076189..4e116cd2e5a2 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -228,12 +228,13 @@ struct signal_struct {
* credential calculations
* (notably. ptrace)
* Deprecated do not use in new code.
- * Use exec_update_mutex instead.
- */
- struct mutex exec_update_mutex; /* Held while task_struct is being
- * updated during exec, and may have
- * inconsistent permissions.
+ * Use exec_update_lock instead.
*/
+ struct rw_semaphore exec_update_lock; /* Held while task_struct is
+ * being updated during exec,
+ * and may have inconsistent
+ * permissions.
+ */
} __randomize_layout;
/*