38 lines
1.1 KiB
Diff
38 lines
1.1 KiB
Diff
|
From 539ad6e6f9a067646a018d77582af0babf8e125e Mon Sep 17 00:00:00 2001
|
||
|
|
From: Logan Gunthorpe <logang@deltatee.com>
|
||
|
|
Date: Tue, 4 Jun 2024 10:38:37 -0600
|
||
|
|
Subject: [PATCH 103/201] mdadm: Block SIGCHLD processes before starting
|
||
|
|
children
|
||
|
|
|
||
|
|
There is a small race condition noticed during code review, but
|
||
|
|
never actully hit in practice, with the write_zero feature.
|
||
|
|
|
||
|
|
If a write zeros fork finishes quickly before wait_for_zero_forks()
|
||
|
|
gets called, then the SIGCHLD will be delivered before the signalfd
|
||
|
|
is setup.
|
||
|
|
|
||
|
|
While this is only theoretical, fix this by blocking the SIGCHLD
|
||
|
|
signal before forking any children.
|
||
|
|
|
||
|
|
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
|
||
|
|
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
|
||
|
|
---
|
||
|
|
Create.c | 1 +
|
||
|
|
1 file changed, 1 insertion(+)
|
||
|
|
|
||
|
|
diff --git a/Create.c b/Create.c
|
||
|
|
index 4f992a22..bd4875e4 100644
|
||
|
|
--- a/Create.c
|
||
|
|
+++ b/Create.c
|
||
|
|
@@ -401,6 +401,7 @@ static int add_disks(int mdfd, struct mdinfo *info, struct shape *s,
|
||
|
|
*/
|
||
|
|
sigemptyset(&sigset);
|
||
|
|
sigaddset(&sigset, SIGINT);
|
||
|
|
+ sigaddset(&sigset, SIGCHLD);
|
||
|
|
sigprocmask(SIG_BLOCK, &sigset, &orig_sigset);
|
||
|
|
memset(zero_pids, 0, sizeof(zero_pids));
|
||
|
|
|
||
|
|
--
|
||
|
|
2.41.0
|
||
|
|
|