core: prevent excessive /proc/self/mountinfo parsing

(cherry picked from commit d586f642fd90e3bb378f7b6d3e3a64a753e51756)

Resolves: #1819868

1 files changed, 6 insertions, 0 deletions

diff --git a/src/core/mount.c b/src/core/mount.c
index 2746372db2..076dfd06a3 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -1763,6 +1763,12 @@ static void mount_enumerate(Manager *m) {
                         goto fail;
                 }
 
+                r = sd_event_source_set_ratelimit(m->mount_event_source, 1 * USEC_PER_SEC, 5);
+                if (r < 0) {
+                        log_error_errno(r, "Failed to enable rate limit for mount events: %m");
+                        goto fail;
+                }
+
                 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
         }