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[87.106.108.193]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-486fe6d923fsm474475985e9.1.2026.03.23.09.58.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Mar 2026 09:58:14 -0700 (PDT) From: =?UTF-8?q?G=C3=BCnther=20Noack?= To: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , "John Johansen" Cc: =?UTF-8?q?G=C3=BCnther=20Noack?= , Justin Suess , linux-security-module@vger.kernel.org, "Tingmao Wang" , "Samasth Norway Ananda" , "Matthieu Buffet" , "Mikhail Ivanov" , konstantin.meskhidze@huawei.com, "Demi Marie Obenour" , "Alyssa Ross" , "Jann Horn" , "Tahera Fahimi" , Sebastian Andrzej Siewior , "Kuniyuki Iwashima" Subject: [PATCH v7 04/11] samples/landlock: Add support for named UNIX domain socket restrictions Date: Mon, 23 Mar 2026 17:56:46 +0100 Message-ID: <20260323165654.193957-5-gnoack3000@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323165654.193957-1-gnoack3000@gmail.com> References: <20260323165654.193957-1-gnoack3000@gmail.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Cc: Mickaël Salaün Signed-off-by: Günther Noack --- samples/landlock/sandboxer.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c index 9f21088c0855..66e56ae275c6 100644 --- a/samples/landlock/sandboxer.c +++ b/samples/landlock/sandboxer.c @@ -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 @@ static bool check_ruleset_scope(const char *const env_var, 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 " -- 2.53.0