linux-kernel - [PATCH -next v2 5/6] landlock/samples: add chmod and chown support

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Message-ID: <20220827111215.131442-6-xiujianfeng@huawei.com>
Date:   Sat, 27 Aug 2022 19:12:14 +0800
From:   Xiu Jianfeng <xiujianfeng@...wei.com>
To:     <mic@...ikod.net>, <paul@...l-moore.com>, <jmorris@...ei.org>,
        <serge@...lyn.com>, <shuah@...nel.org>, <corbet@....net>
CC:     <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-doc@...r.kernel.org>
Subject: [PATCH -next v2 5/6] landlock/samples: add chmod and chown support

update landlock sample to support the new flags
LANDLOCK_ACCESS_FS_{CHMOD, CHGRP}

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 samples/landlock/sandboxer.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c
index 771b6b10d519..639ec39ebd0a 100644
--- a/samples/landlock/sandboxer.c
+++ b/samples/landlock/sandboxer.c
@@ -77,7 +77,9 @@ static int parse_path(char *env_path, const char ***const path_list)
 	LANDLOCK_ACCESS_FS_EXECUTE | \
 	LANDLOCK_ACCESS_FS_WRITE_FILE | \
 	LANDLOCK_ACCESS_FS_READ_FILE | \
-	LANDLOCK_ACCESS_FS_TRUNCATE)
+	LANDLOCK_ACCESS_FS_TRUNCATE | \
+	LANDLOCK_ACCESS_FS_CHMOD | \
+	LANDLOCK_ACCESS_FS_CHGRP)
 
 /* clang-format on */
 
@@ -162,7 +164,9 @@ static int populate_ruleset(const char *const env_var, const int ruleset_fd,
 	LANDLOCK_ACCESS_FS_MAKE_BLOCK | \
 	LANDLOCK_ACCESS_FS_MAKE_SYM | \
 	LANDLOCK_ACCESS_FS_REFER | \
-	LANDLOCK_ACCESS_FS_TRUNCATE)
+	LANDLOCK_ACCESS_FS_TRUNCATE | \
+	LANDLOCK_ACCESS_FS_CHMOD | \
+	LANDLOCK_ACCESS_FS_CHGRP)
 
 /* clang-format on */
 
@@ -233,6 +237,11 @@ int main(const int argc, char *const argv[], char *const *const envp)
 	case 2:
 		/* Removes LANDLOCK_ACCESS_FS_TRUNCATE for ABI < 3 */
 		ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_TRUNCATE;
+		__attribute__((fallthrough));
+	case 3:
+		/* Removes LANDLOCK_ACCESS_FS_{CHMOD, CHGRP} for ABI < 4 */
+		ruleset_attr.handled_access_fs &= ~(LANDLOCK_ACCESS_FS_CHMOD |
+						    LANDLOCK_ACCESS_FS_CHGRP);
 	}
 	access_fs_ro &= ruleset_attr.handled_access_fs;
 	access_fs_rw &= ruleset_attr.handled_access_fs;
-- 
2.17.1