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Wed, 19 Nov 2025 10:07:30 -0800 (PST) From: Daniel Tang To: Nicolas Bouchinet , Xiu Jianfeng , Paul Moore Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Nathan Lynch , Matthew Garrett , Kees Cook , David Howells , James Morris Subject: [PATCH v2] lockdown: Only log restrictions once Date: Wed, 19 Nov 2025 13:07:28 -0500 Message-ID: <1961790.USuA9gRusQ@daniel-desktop3> In-Reply-To: References: <3641397.L58v44csPz@daniel-desktop3> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" KDE's lockscreen causes systemd-logind to spam dmesg about hibernation. systemd declined to cache /sys/power/state due to runtime changeability. Link: https://github.com/systemd/systemd/pull/39802 Signed-off-by: Daniel Tang --- security/lockdown/lockdown.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c index cf83afa1d879..83b50de52f21 100644 --- a/security/lockdown/lockdown.c +++ b/security/lockdown/lockdown.c @@ -58,13 +58,16 @@ early_param("lockdown", lockdown_param); */ static int lockdown_is_locked_down(enum lockdown_reason what) { + static volatile unsigned long lockdown_reasons_seen; + static_assert(ARRAY_SIZE(lockdown_reasons) < sizeof(lockdown_reasons_seen= ) * 8); + if (WARN(what >=3D LOCKDOWN_CONFIDENTIALITY_MAX, "Invalid lockdown reason")) return -EPERM; =20 if (kernel_locked_down >=3D what) { - if (lockdown_reasons[what]) - pr_notice_ratelimited("Lockdown: %s: %s is restricted; see man kernel_l= ockdown.7\n", + if (lockdown_reasons[what] && !test_and_set_bit(what, &lockdown_reasons_= seen)) + pr_notice("Lockdown: %s: %s is restricted; see man kernel_lockdown.7\n", current->comm, lockdown_reasons[what]); return -EPERM; } --=20 2.51.0