tree-wide: reopen log after fork when needed

This follows up on 0b1f3c768ce1bd1490a5e53f539976dcef8ca765, adding more places
where we should reopen the log after forking with FORK_CLOSE_ALL_FDS.

When immediately calling exec in the child, prefer to explicitly reopen the log
after exec fails. In other cases, just use FORK_REOPEN_LOG.

5 files changed, 14 insertions, 5 deletions

diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index eb257144f0..264ecc276b 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -1467,7 +1467,11 @@ int fork_agent(const char *name, const int except[], size_t n_except, pid_t *ret
 
         /* Spawns a temporary TTY agent, making sure it goes away when we go away */
 
-        r = safe_fork_full(name, except, n_except, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS, ret_pid);
+        r = safe_fork_full(name,
+                           except,
+                           n_except,
+                           FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG,
+                           ret_pid);
         if (r < 0)
                 return r;
         if (r > 0)
diff --git a/src/home/homed-home.c b/src/home/homed-home.c
index 5a777e88ef..b0c5ce4232 100644
--- a/src/home/homed-home.c
+++ b/src/home/homed-home.c
@@ -1007,7 +1007,7 @@ static int home_start_work(Home *h, const char *verb, UserRecord *hr, UserRecord
 
         r = safe_fork_full("(sd-homework)",
                            (int[]) { stdin_fd, stdout_fd }, 2,
-                           FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG, &pid);
+                           FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_REOPEN_LOG, &pid);
         if (r < 0)
                 return r;
         if (r == 0) {
@@ -1838,7 +1838,9 @@ int home_killall(Home *h) {
         assert(h->uid > 0); /* We never should be UID 0 */
 
         /* Let's kill everything matching the specified UID */
-        r = safe_fork("(sd-killer)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
+        r = safe_fork("(sd-killer)",
+                      FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG|FORK_REOPEN_LOG,
+                      NULL);
         if (r < 0)
                 return r;
         if (r == 0) {
diff --git a/src/home/homework-fscrypt.c b/src/home/homework-fscrypt.c
index d0676f8ae6..037e4853fd 100644
--- a/src/home/homework-fscrypt.c
+++ b/src/home/homework-fscrypt.c
@@ -324,7 +324,9 @@ int home_prepare_fscrypt(
         /* Also install the access key in the user's own keyring */
 
         if (uid_is_valid(h->uid)) {
-                r = safe_fork("(sd-addkey)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
+                r = safe_fork("(sd-addkey)",
+                              FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT|FORK_REOPEN_LOG,
+                              NULL);
                 if (r < 0)
                         return log_error_errno(r, "Failed install encryption key in user's keyring: %m");
                 if (r == 0) {
diff --git a/src/login/logind-brightness.c b/src/login/logind-brightness.c
index 5eb3534f53..d6b9289ea6 100644
--- a/src/login/logind-brightness.c
+++ b/src/login/logind-brightness.c
@@ -137,7 +137,7 @@ static int brightness_writer_fork(BrightnessWriter *w) {
         assert(w->child == 0);
         assert(!w->child_event_source);
 
-        r = safe_fork("(sd-bright)", FORK_DEATHSIG|FORK_NULL_STDIO|FORK_CLOSE_ALL_FDS|FORK_LOG, &w->child);
+        r = safe_fork("(sd-bright)", FORK_DEATHSIG|FORK_NULL_STDIO|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_REOPEN_LOG, &w->child);
         if (r < 0)
                 return r;
         if (r == 0) {
diff --git a/src/shared/dissect-image.c b/src/shared/dissect-image.c
index 6f9a457614..cca92e7fb4 100644
--- a/src/shared/dissect-image.c
+++ b/src/shared/dissect-image.c
@@ -1287,6 +1287,7 @@ static int run_fsck(const char *node, const char *fstype) {
         if (r == 0) {
                 /* Child */
                 execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL);
+                log_open();
                 log_debug_errno(errno, "Failed to execl() fsck: %m");
                 _exit(FSCK_OPERATIONAL_ERROR);
         }