[PATCH 3/3] idmapped-mounts: add missing ownership comparisons to setgid tests

[Christian Brauner <brauner@kernel.org>]

From: Christian Brauner <christian.brauner@ubuntu.com>

In some setgid tests we missed to check ownership right after file or
directory creation in order to verify whether gid ownership inheritance
from the parent directory to the newly created file or directory works
correctly. Add the missing ones.

Cc: Seth Forshee <seth.forshee@digitalocean.com>
Cc: Eryu Guan <guaneryu@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: fstests@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
 src/idmapped-mounts/idmapped-mounts.c | 38 +++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/src/idmapped-mounts/idmapped-mounts.c b/src/idmapped-mounts/idmapped-mounts.c
index c53e1942..a5c0a983 100644
--- a/src/idmapped-mounts/idmapped-mounts.c
+++ b/src/idmapped-mounts/idmapped-mounts.c
@@ -7863,6 +7863,12 @@ static int setgid_create(void)
 		if (!is_setgid(t_dir1_fd, DIR1, 0))
 			die("failure: is_setgid");
 
+		if (!expected_uid_gid(t_dir1_fd, FILE1, 0, 0, 0))
+			die("failure: check ownership");
+
+		if (!expected_uid_gid(t_dir1_fd, DIR1, 0, 0, 0))
+			die("failure: check ownership");
+
 		if (unlinkat(t_dir1_fd, FILE1, 0))
 			die("failure: delete");
 
@@ -7911,6 +7917,22 @@ static int setgid_create(void)
 				die("failure: is_setgid");
 		}
 
+		/*
+		 * In setgid directories newly created files always inherit the
+		 * gid from the parent directory. Verify that the file is owned
+		 * by gid 0, not by gid 10000.
+		 */
+		if (!expected_uid_gid(t_dir1_fd, FILE1, 0, 0, 0))
+			die("failure: check ownership");
+
+		/*
+		 * In setgid directories newly created directories always
+		 * inherit the gid from the parent directory. Verify that the
+		 * directory is owned by gid 0, not by gid 10000.
+		 */
+		if (!expected_uid_gid(t_dir1_fd, DIR1, 0, 0, 0))
+			die("failure: check ownership");
+
 		exit(EXIT_SUCCESS);
 	}
 	if (wait_for_pid(pid))
@@ -8013,6 +8035,22 @@ static int setgid_create_idmapped(void)
 				die("failure: is_setgid");
 		}
 
+		/*
+		 * In setgid directories newly created files always inherit the
+		 * gid from the parent directory. Verify that the file is owned
+		 * by gid 10000, not by gid 11000.
+		 */
+		if (!expected_uid_gid(open_tree_fd, FILE1, 0, 10000, 10000))
+			die("failure: check ownership");
+
+		/*
+		 * In setgid directories newly created directories always
+		 * inherit the gid from the parent directory. Verify that the
+		 * directory is owned by gid 10000, not by gid 11000.
+		 */
+		if (!expected_uid_gid(open_tree_fd, DIR1, 0, 10000, 10000))
+			die("failure: check ownership");
+
 		exit(EXIT_SUCCESS);
 	}
 	if (wait_for_pid(pid))
-- 
2.32.0