linux-kernel - [PATCH] seccomp: don't leave dangling ->notif if file allocation fails

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20200902140953.1201956-1-tycho@tycho.pizza>
Date:   Wed,  2 Sep 2020 08:09:53 -0600
From:   Tycho Andersen <tycho@...ho.pizza>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        Tycho Andersen <tycho@...ho.pizza>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH] seccomp: don't leave dangling ->notif if file allocation fails

Christian and Kees both pointed out that this is a bit sloppy to open-code
both places, and Christian points out that we leave a dangling pointer to
->notif if file allocation fails. Since we check ->notif for null in order
to determine if it's ok to install a filter, this means people won't be
able to install a filter if the file allocation fails for some reason, even
if they subsequently should be able to.

To fix this, let's hoist this free+null into its own little helper and use
it.

Reported-by: Kees Cook <keescook@...omium.org>
Reported-by: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Tycho Andersen <tycho@...ho.pizza>
---
 kernel/seccomp.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index bb0dd9ae699a..676d4af62103 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -1109,6 +1109,12 @@ static long seccomp_set_mode_strict(void)
 }
 
 #ifdef CONFIG_SECCOMP_FILTER
+static void seccomp_notify_free(struct seccomp_filter *filter)
+{
+	kfree(filter->notif);
+	filter->notif = NULL;
+}
+
 static void seccomp_notify_detach(struct seccomp_filter *filter)
 {
 	struct seccomp_knotif *knotif;
@@ -1138,8 +1144,7 @@ static void seccomp_notify_detach(struct seccomp_filter *filter)
 		complete(&knotif->ready);
 	}
 
-	kfree(filter->notif);
-	filter->notif = NULL;
+	seccomp_notify_free(filter);
 	mutex_unlock(&filter->notify_lock);
 }
 
@@ -1494,7 +1499,7 @@ static struct file *init_listener(struct seccomp_filter *filter)
 
 out_notif:
 	if (IS_ERR(ret))
-		kfree(filter->notif);
+		seccomp_notify_free(filter);
 out:
 	return ret;
 }

base-commit: 7b6aa0bb62fd6fd50f2d14136136262d28fb2dfe
-- 
2.25.1