In mainline rootfs is marked always as MNT_LOCKED,
sys_umount checks this flag and fails its processing.
Our kernels lacks for MNT_LOCKED flag, so we use another kind of check
to prevent incorrect operation.
v2: use mnt_has_parent()
https://jira.sw.ru/browse/PSBM-46437
Signed-off-by: Vasily Averin <v...@virtuozzo.com>
diff --git a/fs/namespace.c b/fs/namespace.c
index 988320b..4fb935a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1355,6 +1355,8 @@ SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
goto dput_and_out;
if (!check_mnt(mnt))
goto dput_and_out;
+ if (!mnt_has_parent(mnt))
+ goto dput_and_out;
retval = do_umount(mnt, flags);
dput_and_out:
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