linux-kernel - [RFC PATCH] selinux: log about VM being executable by default

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Message-Id: <20230720103549.25255-1-cgzones@googlemail.com>
Date:   Thu, 20 Jul 2023 12:35:49 +0200
From:   Christian Göttsche <cgzones@...glemail.com>
To:     selinux@...r.kernel.org
Cc:     Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH] selinux: log about VM being executable by default

In case virtual memory is being marked as executable by default, SELinux
checks regarding explicit potential dangerous use are disabled.

Inform the user about it.

Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
 security/selinux/hooks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 6f53fa71fbdb..3a7ece84c2cc 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7265,6 +7265,8 @@ static __init int selinux_init(void)
 	cred_init_security();
 
 	default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
+	if (!default_noexec)
+		pr_notice("SELinux:  virtual memory is executable by default - related checks disabled\n");
 
 	avc_init();
 
-- 
2.40.1