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samples/landlock: Add support for named UNIX domain socket restrictions

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The access right for UNIX domain socket lookups is grouped with the
read-write rights in the sample tool.  Rationale: In the general case,
any operations are possible through a UNIX domain socket, including
data-mutating operations.

Cc: Justin Suess <utilityemal77@gmail.com>
Cc: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20260327164838.38231-7-gnoack3000@gmail.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Günther Noack
2026-03-27 17:48:31 +01:00
committed by Mickaël Salaün
parent a46e32db1f
commit a92cb5d7c6
1 changed files with 9 additions and 3 deletions
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12
samples/landlock/sandboxer.c
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@@ -111,7 +111,8 @@ static int parse_path(char *env_path, const char ***const path_list)
LANDLOCK_ACCESS_FS_WRITE_FILE | \
LANDLOCK_ACCESS_FS_READ_FILE | \
LANDLOCK_ACCESS_FS_TRUNCATE | \
LANDLOCK_ACCESS_FS_IOCTL_DEV)
LANDLOCK_ACCESS_FS_IOCTL_DEV | \
LANDLOCK_ACCESS_FS_RESOLVE_UNIX)
/* clang-format on */
@@ -295,11 +296,12 @@ out_unset:
LANDLOCK_ACCESS_FS_MAKE_SYM | \
LANDLOCK_ACCESS_FS_REFER | \
LANDLOCK_ACCESS_FS_TRUNCATE | \
LANDLOCK_ACCESS_FS_IOCTL_DEV)
LANDLOCK_ACCESS_FS_IOCTL_DEV | \
LANDLOCK_ACCESS_FS_RESOLVE_UNIX)
/* clang-format on */
#define LANDLOCK_ABI_LAST 8
#define LANDLOCK_ABI_LAST 9
#define XSTR(s) #s
#define STR(s) XSTR(s)
@@ -438,6 +440,10 @@ int main(const int argc, char *const argv[], char *const *const envp)
~LANDLOCK_RESTRICT_SELF_LOG_NEW_EXEC_ON;
__attribute__((fallthrough));
case 7:
case 8:
/* Removes LANDLOCK_ACCESS_FS_RESOLVE_UNIX for ABI < 9 */
ruleset_attr.handled_access_fs &=
~LANDLOCK_ACCESS_FS_RESOLVE_UNIX;
/* Must be printed for any ABI < LANDLOCK_ABI_LAST. */
fprintf(stderr,
"Hint: You should update the running kernel "