linux-kernel - [PATCH V37 29/29] lockdown: Print current->comm in restriction messages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190731221617.234725-30-matthewgarrett@google.com>
Date:   Wed, 31 Jul 2019 15:16:17 -0700
From:   Matthew Garrett <matthewgarrett@...gle.com>
To:     jmorris@...ei.org
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Matthew Garrett <matthewgarrett@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH V37 29/29] lockdown: Print current->comm in restriction messages

Print the content of current->comm in messages generated by lockdown to
indicate a restriction that was hit.  This makes it a bit easier to find
out what caused the message.

The message now patterned something like:

        Lockdown: <comm>: <what> is restricted; see man kernel_lockdown.7

Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Matthew Garrett <mjg59@...gle.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
---
 fs/proc/kcore.c              | 5 +++--
 security/lockdown/lockdown.c | 8 ++++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index ee2c576cc94e..e2ed8e08cc7a 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -548,11 +548,12 @@ static int open_kcore(struct inode *inode, struct file *filp)
 {
 	int ret = security_locked_down(LOCKDOWN_KCORE);
 
-	if (ret)
-		return ret;
 	if (!capable(CAP_SYS_RAWIO))
 		return -EPERM;
 
+	if (ret)
+		return ret;
+
 	filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!filp->private_data)
 		return -ENOMEM;
diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index 173191562047..f6c74cf6a798 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -81,10 +81,14 @@ early_param("lockdown", lockdown_param);
  */
 static int lockdown_is_locked_down(enum lockdown_reason what)
 {
+	if (WARN(what >= LOCKDOWN_CONFIDENTIALITY_MAX,
+		 "Invalid lockdown reason"))
+		return -EPERM;
+
 	if (kernel_locked_down >= what) {
 		if (lockdown_reasons[what])
-			pr_notice("Lockdown: %s is restricted; see man kernel_lockdown.7\n",
-				  lockdown_reasons[what]);
+			pr_notice("Lockdown: %s: %s is restricted; see man kernel_lockdown.7\n",
+				  current->comm, lockdown_reasons[what]);
 		return -EPERM;
 	}
 
-- 
2.22.0.770.g0f2c4a37fd-goog