Signed-off-by: Pavel Shilovsky <piastry@xxxxxxxxxxx>
---
fs/locks.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/locks.c b/fs/locks.c
index 7ecc511..c7e780a 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1904,6 +1904,12 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
goto out;
}
+ /* Disable LOCK_MAND support for FS mounted with MS_SHARELOCK */
+ if ((cmd & LOCK_MAND) && IS_SHARELOCK(f.file->f_path.dentry->d_inode)) {
+ error = -EPERM;
+ goto out;
+ }
+
can_sleep = !(cmd & LOCK_NB);
cmd &= ~LOCK_NB;
unlock = (cmd == LOCK_UN);
--
1.7.10.4
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