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[87.106.108.193]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43fe4e4eec9sm37217240f8f.34.2026.04.21.10.58.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 10:58:47 -0700 (PDT) From: =?UTF-8?q?G=C3=BCnther=20Noack?= To: Alejandro Colomar , =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= Cc: linux-man@vger.kernel.org, =?UTF-8?q?G=C3=BCnther=20Noack?= Subject: [PATCH v3 1/4] man/man2/landlock_create_ruleset.2: Clarify attr and size constraints Date: Tue, 21 Apr 2026 19:58:39 +0200 Message-ID: <20260421175842.6870-2-gnoack3000@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260421175842.6870-1-gnoack3000@gmail.com> References: <20260421175842.6870-1-gnoack3000@gmail.com> Precedence: bulk X-Mailing-List: linux-man@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When used with special flags like LANDLOCK_CREATE_RULESET_VERSION, attr must be NULL and size must be 0. Signed-off-by: Günther Noack --- man/man2/landlock_create_ruleset.2 | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/man/man2/landlock_create_ruleset.2 b/man/man2/landlock_create_ruleset.2 index d4eb5d827656..dd14f0ceba7c 100644 --- a/man/man2/landlock_create_ruleset.2 +++ b/man/man2/landlock_create_ruleset.2 @@ -116,11 +116,7 @@ Otherwise, can be set to: .TP .B LANDLOCK_CREATE_RULESET_VERSION -If -.I attr -is NULL and -.I size -is 0, then the returned value is the highest supported Landlock ABI version +Return the highest supported Landlock ABI version (starting at 1). This version can be used for a best-effort security approach, which is encouraged when user space is not pinned to a specific kernel @@ -129,6 +125,15 @@ version. Unless noted otherwise, all features documented in these manual pages are available with the version 1. +.P +If +.B LANDLOCK_CREATE_RULESET_VERSION +is set, +then +.I attr +must be NULL and +.I size +must be 0. .SH RETURN VALUE On success, .BR landlock_create_ruleset () @@ -159,6 +164,14 @@ Unknown or unknown access, or unknown scope, or too small .IR size . .TP +.B EINVAL +Non-NULL +.I attr +or non-zero +.I size +in combination with +.BR LANDLOCK_CREATE_RULESET_VERSION . +.TP .B ENOMSG Empty accesses (i.e., .I attr -- 2.53.0