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Hallyn" , =?UTF-8?q?G=C3=BCnther=20Noack?= Subject: [PATCH v2 3/4] samples/landlock: Extend sample tool to support LANDLOCK_ACCESS_FS_TRUNCATE Date: Tue, 12 Jul 2022 23:14:04 +0200 Message-Id: <20220712211405.14705-4-gnoack3000@gmail.com> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220712211405.14705-1-gnoack3000@gmail.com> References: <20220712211405.14705-1-gnoack3000@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: The sample tool will restrict the truncate operation if possible with the current kernel. Signed-off-by: Günther Noack Link: https://lore.kernel.org/all/20220707200612.132705-1-gnoack3000@gmail.com/ --- samples/landlock/sandboxer.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c index 3e404e51ec64..4c3ed0097ffd 100644 --- a/samples/landlock/sandboxer.c +++ b/samples/landlock/sandboxer.c @@ -76,7 +76,8 @@ static int parse_path(char *env_path, const char ***const path_list) #define ACCESS_FILE ( \ LANDLOCK_ACCESS_FS_EXECUTE | \ LANDLOCK_ACCESS_FS_WRITE_FILE | \ - LANDLOCK_ACCESS_FS_READ_FILE) + LANDLOCK_ACCESS_FS_READ_FILE | \ + LANDLOCK_ACCESS_FS_TRUNCATE) /* clang-format on */ @@ -160,11 +161,15 @@ static int populate_ruleset(const char *const env_var, const int ruleset_fd, LANDLOCK_ACCESS_FS_MAKE_FIFO | \ LANDLOCK_ACCESS_FS_MAKE_BLOCK | \ LANDLOCK_ACCESS_FS_MAKE_SYM | \ - LANDLOCK_ACCESS_FS_REFER) + LANDLOCK_ACCESS_FS_REFER | \ + LANDLOCK_ACCESS_FS_TRUNCATE) #define ACCESS_ABI_2 ( \ LANDLOCK_ACCESS_FS_REFER) +#define ACCESS_ABI_3 ( \ + LANDLOCK_ACCESS_FS_TRUNCATE) + /* clang-format on */ int main(const int argc, char *const argv[], char *const *const envp) @@ -226,6 +231,12 @@ int main(const int argc, char *const argv[], char *const *const envp) return 1; } /* Best-effort security. */ + if (abi < 3) { + ruleset_attr.handled_access_fs &= ~ACCESS_ABI_3; + access_fs_ro &= ~ACCESS_ABI_3; + access_fs_rw &= ~ACCESS_ABI_3; + } + if (abi < 2) { ruleset_attr.handled_access_fs &= ~ACCESS_ABI_2; access_fs_ro &= ~ACCESS_ABI_2; -- 2.37.0