Re: [PATCH v4 21/30] selftests/landlock: Add wrappers.h

["Mickaël Salaün" <mic@digikod.net>]

On Wed, Jan 08, 2025 at 04:43:29PM +0100, Mickaël Salaün wrote:
> Extract syscall wrappers to make them usable by standalone binaries (see
> next commit).
> 
> Cc: Günther Noack <gnoack@google.com>
> Signed-off-by: Mickaël Salaün <mic@digikod.net>
> Link: https://lore.kernel.org/r/20250108154338.1129069-22-mic@digikod.net

Pushed in my next tree to simplify next patch series.

> ---
> 
> Changes since v3:
> - New patch.
> ---
>  tools/testing/selftests/landlock/common.h   | 37 +---------------
>  tools/testing/selftests/landlock/wrappers.h | 47 +++++++++++++++++++++
>  2 files changed, 48 insertions(+), 36 deletions(-)
>  create mode 100644 tools/testing/selftests/landlock/wrappers.h
> 
> diff --git a/tools/testing/selftests/landlock/common.h b/tools/testing/selftests/landlock/common.h
> index 61056fa074bb..8391ab574f64 100644
> --- a/tools/testing/selftests/landlock/common.h
> +++ b/tools/testing/selftests/landlock/common.h
> @@ -9,17 +9,15 @@
>  
>  #include <arpa/inet.h>
>  #include <errno.h>
> -#include <linux/landlock.h>
>  #include <linux/securebits.h>
>  #include <sys/capability.h>
>  #include <sys/socket.h>
> -#include <sys/syscall.h>
> -#include <sys/types.h>
>  #include <sys/un.h>
>  #include <sys/wait.h>
>  #include <unistd.h>
>  
>  #include "../kselftest_harness.h"
> +#include "wrappers.h"
>  
>  #define TMP_DIR "tmp"
>  
> @@ -30,34 +28,6 @@
>  /* TEST_F_FORK() should not be used for new tests. */
>  #define TEST_F_FORK(fixture_name, test_name) TEST_F(fixture_name, test_name)
>  
> -#ifndef landlock_create_ruleset
> -static inline int
> -landlock_create_ruleset(const struct landlock_ruleset_attr *const attr,
> -			const size_t size, const __u32 flags)
> -{
> -	return syscall(__NR_landlock_create_ruleset, attr, size, flags);
> -}
> -#endif
> -
> -#ifndef landlock_add_rule
> -static inline int landlock_add_rule(const int ruleset_fd,
> -				    const enum landlock_rule_type rule_type,
> -				    const void *const rule_attr,
> -				    const __u32 flags)
> -{
> -	return syscall(__NR_landlock_add_rule, ruleset_fd, rule_type, rule_attr,
> -		       flags);
> -}
> -#endif
> -
> -#ifndef landlock_restrict_self
> -static inline int landlock_restrict_self(const int ruleset_fd,
> -					 const __u32 flags)
> -{
> -	return syscall(__NR_landlock_restrict_self, ruleset_fd, flags);
> -}
> -#endif
> -
>  static void _init_caps(struct __test_metadata *const _metadata, bool drop_all)
>  {
>  	cap_t cap_p;
> @@ -250,11 +220,6 @@ struct service_fixture {
>  	};
>  };
>  
> -static pid_t __maybe_unused sys_gettid(void)
> -{
> -	return syscall(__NR_gettid);
> -}
> -
>  static void __maybe_unused set_unix_address(struct service_fixture *const srv,
>  					    const unsigned short index)
>  {
> diff --git a/tools/testing/selftests/landlock/wrappers.h b/tools/testing/selftests/landlock/wrappers.h
> new file mode 100644
> index 000000000000..32963a44876b
> --- /dev/null
> +++ b/tools/testing/selftests/landlock/wrappers.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Landlock helpers
> + *
> + * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
> + * Copyright © 2019-2020 ANSSI
> + * Copyright © 2021-2024 Microsoft Corporation
> + */
> +
> +#define _GNU_SOURCE
> +#include <linux/landlock.h>
> +#include <sys/syscall.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +
> +#ifndef landlock_create_ruleset
> +static inline int
> +landlock_create_ruleset(const struct landlock_ruleset_attr *const attr,
> +			const size_t size, const __u32 flags)
> +{
> +	return syscall(__NR_landlock_create_ruleset, attr, size, flags);
> +}
> +#endif
> +
> +#ifndef landlock_add_rule
> +static inline int landlock_add_rule(const int ruleset_fd,
> +				    const enum landlock_rule_type rule_type,
> +				    const void *const rule_attr,
> +				    const __u32 flags)
> +{
> +	return syscall(__NR_landlock_add_rule, ruleset_fd, rule_type, rule_attr,
> +		       flags);
> +}
> +#endif
> +
> +#ifndef landlock_restrict_self
> +static inline int landlock_restrict_self(const int ruleset_fd,
> +					 const __u32 flags)
> +{
> +	return syscall(__NR_landlock_restrict_self, ruleset_fd, flags);
> +}
> +#endif
> +
> +static inline pid_t sys_gettid(void)
> +{
> +	return syscall(__NR_gettid);
> +}
> -- 
> 2.47.1
> 
>