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authorMark Hatle <mark.hatle@windriver.com>2016-09-22 16:37:20 -0500
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-09-24 07:30:10 +0100
commit2305c0038dd7d9d3bffd7babdffc81deafbe45a1 (patch)
tree294c6b840abefba7747e0426896fd23866051f6d /meta/recipes-devtools/pseudo/files
parent1d1f94b944161a0db78985b8f58da0828d68ce71 (diff)
downloadpoky-2305c0038dd7d9d3bffd7babdffc81deafbe45a1.tar.gz
pseudo: Fix problem where pseudo could kill a container init
In a heavily loaded container, the child process might not started before the parent process had terminated. The child process attempts to signal the parent with SIGUSR1. If the parent had terminated, the parent becomes PID 1, which is generally init. When it signaled pid 1, it caused the docker mini-init to terminate. This doesn't happen in a traditional system, as systemd/sysvinit is protected to only root users can signal it. [YOCTO #10324] (From OE-Core rev: f6f13b049e8683d2a2af3e120ba979b58f9a7d9a) Signed-off-by: Mark Hatle <mark.hatle@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/recipes-devtools/pseudo/files')
-rw-r--r--meta/recipes-devtools/pseudo/files/0001-Don-t-send-SIGUSR1-to-init.patch48
1 files changed, 48 insertions, 0 deletions
diff --git a/meta/recipes-devtools/pseudo/files/0001-Don-t-send-SIGUSR1-to-init.patch b/meta/recipes-devtools/pseudo/files/0001-Don-t-send-SIGUSR1-to-init.patch
new file mode 100644
index 0000000000..6c694ceb0d
--- /dev/null
+++ b/meta/recipes-devtools/pseudo/files/0001-Don-t-send-SIGUSR1-to-init.patch
@@ -0,0 +1,48 @@
1From befc6dbd6469d428c9e0830dbe51bdf7ac39d9ae Mon Sep 17 00:00:00 2001
2From: Seebs <seebs@seebs.net>
3Date: Thu, 22 Sep 2016 14:35:04 -0500
4Subject: [PATCH] Don't send SIGUSR1 to init.
5
6If the parent exits due to child process being slow, getppid() will return
71, and we'll send SIGUSR1 to init, which can break things like dumbinit
8which aren't adequately protected against non-root processes sending them
9signals.
10
11Signed-off-by: Seebs <seebs@seebs.net>
12
13Upstream-Status: Backport (commit befc6dbd6469d428c9e0830dbe51bdf7ac39d9ae)
14
15[YOCTO #10324]
16
17This resolves an issue where a docker container running builds would die
18due to it's 'mini init' being signaled by pseudo.
19
20Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
21---
22 pseudo_server.c | 11 ++++++++---
23
24diff --git a/pseudo_server.c b/pseudo_server.c
25index 65102dd..8731d20 100644
26--- a/pseudo_server.c
27+++ b/pseudo_server.c
28@@ -358,9 +358,14 @@ pseudo_server_start(int daemonize) {
29 signal(SIGTERM, quit_now);
30 /* tell parent process to stop waiting */
31 if (daemonize) {
32- pseudo_diag("Setup complete, sending SIGUSR1 to pid %d.\n",
33- getppid());
34- kill(getppid(), SIGUSR1);
35+ pid_t ppid = getppid();
36+ if (ppid == 1) {
37+ pseudo_diag("Setup complete, but parent is init, not sending SIGUSR1.\n");
38+ } else {
39+ pseudo_diag("Setup complete, sending SIGUSR1 to pid %d.\n",
40+ ppid);
41+ kill(ppid, SIGUSR1);
42+ }
43 }
44 pseudo_server_loop();
45 return 0;
46--
472.5.5
48