linux-kernel - Re: [syzbot] [net?] KASAN: slab-out-of-bounds Read in dns_resolver

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Date:   Thu, 14 Dec 2023 05:59:03 -0800
From:   syzbot <syzbot+94bbb75204a05da3d89f@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [net?] KASAN: slab-out-of-bounds Read in dns_resolver_preparse

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Subject: [net?] KASAN: slab-out-of-bounds Read in dns_resolver_preparse
Author: eadavis@...com

please test slab-out-of-bounds Read in dns_resolver_preparse

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 48e8992e33ab
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 10ba439968f7..f28ba8a703fe 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -83,7 +83,7 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
 	long ret;
 
 	ret = -EINVAL;
-	if (plen > 1024 * 1024 - 1)
+	if (plen > 1024 * 1024 - 1 || plen < 48)
 		goto error;
 
 	/* draw all the data into kernel space */