From: Tiwei Bie <tiwei.btw@antgroup.com>
Date: Thu, 24 Oct 2024 14:28:27 +0000 (+0800)
Subject: um: Set parent-death signal for write_sigio thread/process
X-Git-Tag: v6.13-rc1~18^2~20
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c6c4adee65969218b0b7b13f568fd2c6f2333373;p=thirdparty%2Fkernel%2Flinux.git

um: Set parent-death signal for write_sigio thread/process

The write_sigio thread is not really a traditional thread. Set
the parent-death signal for it to ensure that it will be killed
if the UML kernel dies unexpectedly without proper cleanup.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20241024142828.2612828-4-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c
index 9e71794839e87..9aac8def4d635 100644
--- a/arch/um/os-Linux/sigio.c
+++ b/arch/um/os-Linux/sigio.c
@@ -55,6 +55,7 @@ static int write_sigio_thread(void *unused)
 	int i, n, respond_fd;
 	char c;
 
+	os_set_pdeathsig();
 	os_fix_helper_signals();
 	fds = &current_poll;
 	while (1) {