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rootless: avoid zombie process on first launch

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avoid a zombie process if on the first launch Podman creates a long
living process, such as "podman system service -t 0".

The `r` variable was overriden thus causing the waitpid to fail and
not clean up the intermediate process.

Closes: https://github.com/containers/podman/issues/10575

[NO TESTS NEEDED]

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2021-07-29 10:21:25 +02:00
parent 1bf7a9ed9c
commit 724d048234
1 changed files with 15 additions and 10 deletions
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25
pkg/rootless/rootless_linux.c
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@ -465,38 +465,43 @@ reexec_in_user_namespace_wait (int pid, int options)
static int
create_pause_process (const char *pause_pid_file_path, char **argv)
{
int r, p[2];
pid_t pid;
int p[2];
if (pipe (p) < 0)
_exit (EXIT_FAILURE);
return -1;
r = fork ();
if (r < 0)
_exit (EXIT_FAILURE);
pid = fork ();
if (pid < 0)
{
close (p[0]);
close (p[1]);
return -1;
}
if (r)
if (pid)
{
char b;
int r;
close (p[1]);
/* Block until we write the pid file. */
r = TEMP_FAILURE_RETRY (read (p[0], &b, 1));
close (p[0]);
reexec_in_user_namespace_wait (r, 0);
reexec_in_user_namespace_wait (pid, 0);
return r == 1 && b == '0' ? 0 : -1;
}
else
{
int fd;
pid_t pid;
int r, fd;
close (p[0]);
setsid ();
pid = fork ();
if (r < 0)
if (pid < 0)
_exit (EXIT_FAILURE);
if (pid)