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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2017-02-22 15:40:50 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-22 16:41:27 -0800
commit612dafabb6a0fa62e9b86f11da5d37ee11dea28f (patch)
treeaa28468a75fa6fa60717e1904edadd9e888e3fef /block/ioprio.c
parent6302666d2ef135be46ca34226791afea275f62d1 (diff)
block: use for_each_thread() in sys_ioprio_set()/sys_ioprio_get()
IOPRIO_WHO_USER case in sys_ioprio_set()/sys_ioprio_get() are using while_each_thread(), which is unsafe under RCU lock according to commit 0c740d0afc3bff0a ("introduce for_each_thread() to replace the buggy while_each_thread()"). Use for_each_thread() (via for_each_process_thread()) which is safe under RCU lock. Link: http://lkml.kernel.org/r/201702011947.DBD56740.OMVHOLOtSJFFFQ@I-love.SAKURA.ne.jp Link: http://lkml.kernel.org/r/1486041779-4401-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/ioprio.c')
-rw-r--r--block/ioprio.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/block/ioprio.c b/block/ioprio.c
index 01b8116298a1..3790669232ff 100644
--- a/block/ioprio.c
+++ b/block/ioprio.c
@@ -122,14 +122,14 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
if (!user)
break;
- do_each_thread(g, p) {
+ for_each_process_thread(g, p) {
if (!uid_eq(task_uid(p), uid) ||
!task_pid_vnr(p))
continue;
ret = set_task_ioprio(p, ioprio);
if (ret)
goto free_uid;
- } while_each_thread(g, p);
+ }
free_uid:
if (who)
free_uid(user);
@@ -222,7 +222,7 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
if (!user)
break;
- do_each_thread(g, p) {
+ for_each_process_thread(g, p) {
if (!uid_eq(task_uid(p), user->uid) ||
!task_pid_vnr(p))
continue;
@@ -233,7 +233,7 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
ret = tmpio;
else
ret = ioprio_best(ret, tmpio);
- } while_each_thread(g, p);
+ }
if (who)
free_uid(user);