From 9d8f8233b9fa525a7e37350fbc18877051128c5d Mon Sep 17 00:00:00 2001 From: Hanna Reitz Date: Thu, 9 Jun 2022 14:26:59 +0200 Subject: [PATCH] qsd: Unlink absolute PID file path MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit After writing the PID file, we register an atexit() handler to unlink it when the process terminates. However, if the process has changed its working directory in the meantime (e.g. in os_setup_post() when daemonizing), this will not work when the PID file path was relative. Therefore, pass the absolute path (created with realpath()) to the unlink() call in the atexit() handler. (realpath() needs a path pointing to an existing file, so we cannot use it before qemu_write_pidfile().) Reproducer: $ cd /tmp $ qemu-storage-daemon --daemonize --pidfile qsd.pid $ file qsd.pid qsd.pid: ASCII text $ kill $(cat qsd.pid) $ file qsd.pid qsd.pid: ASCII text (qsd.pid should be gone after the process has terminated.) Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2092322 Signed-off-by: Hanna Reitz Message-Id: <20220609122701.17172-2-hreitz@redhat.com> Reviewed-by: Daniel P. Berrangé --- storage-daemon/qemu-storage-daemon.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/storage-daemon/qemu-storage-daemon.c b/storage-daemon/qemu-storage-daemon.c index 448c318e23..7718f6dcda 100644 --- a/storage-daemon/qemu-storage-daemon.c +++ b/storage-daemon/qemu-storage-daemon.c @@ -61,6 +61,7 @@ #include "trace/control.h" static const char *pid_file; +static char *pid_file_realpath; static volatile bool exit_requested = false; void qemu_system_killed(int signal, pid_t pid) @@ -363,7 +364,7 @@ static void process_options(int argc, char *argv[], bool pre_init_pass) static void pid_file_cleanup(void) { - unlink(pid_file); + unlink(pid_file_realpath); } static void pid_file_init(void) @@ -379,6 +380,14 @@ static void pid_file_init(void) exit(EXIT_FAILURE); } + pid_file_realpath = g_malloc(PATH_MAX); + if (!realpath(pid_file, pid_file_realpath)) { + error_report("cannot resolve PID file path: %s: %s", + pid_file, strerror(errno)); + unlink(pid_file); + exit(EXIT_FAILURE); + } + atexit(pid_file_cleanup); }