diff mbox series

libsemanage: open lock_file with O_RDWR

Message ID 20241111123304.651436-1-lautrbach@redhat.com (mailing list archive)
State New
Delegated to: Petr Lautrbach
Headers show
Series libsemanage: open lock_file with O_RDWR | expand

Commit Message

Petr Lautrbach Nov. 11, 2024, 12:32 p.m. UTC
man 2 flock:
    Since Linux 2.6.12, NFS clients support flock() locks by emulating
    them as fcntl(2) byte-range locks on the entire file.  This means
    that fcntl(2) and  flock()  locks  do  interact with one another
    over NFS.  It also means that in order to place an exclusive lock,
    the file must be opened for writing.

Fixes:
    # semanage fcontext -d -e /home /tmp/testdir
    libsemanage.semanage_get_lock: Error obtaining direct transaction lock at /var/lib/selinux/targeted/semanage.trans.LOCK. (Bad file descriptor).
    OSError: Bad file descriptor

Signed-off-by: Petr Lautrbach <lautrbach@redhat.com>
---
 libsemanage/src/semanage_store.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/libsemanage/src/semanage_store.c b/libsemanage/src/semanage_store.c
index 0ac2e5b2ad39..c26f5667b3cd 100644
--- a/libsemanage/src/semanage_store.c
+++ b/libsemanage/src/semanage_store.c
@@ -1899,14 +1899,12 @@  static int semanage_get_lock(semanage_handle_t * sh,
 	struct timeval origtime, curtime;
 	int got_lock = 0;
 
-	if ((fd = open(lock_file, O_RDONLY)) == -1) {
-		if ((fd =
-		     open(lock_file, O_RDWR | O_CREAT | O_TRUNC,
-			  S_IRUSR | S_IWUSR)) == -1) {
-			ERR(sh, "Could not open direct %s at %s.", lock_name,
-			    lock_file);
-			return -1;
-		}
+	if ((fd =
+	     open(lock_file, O_RDWR | O_CREAT | O_TRUNC,
+		  S_IRUSR | S_IWUSR)) == -1) {
+		ERR(sh, "Could not open direct %s at %s.", lock_name,
+		    lock_file);
+		return -1;
 	}
 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
 		ERR(sh, "Could not set close-on-exec for %s at %s.", lock_name,