From: Austin Kim <austindh.kim@gmail.com>
To: mic@digikod.net, serge@hallyn.com
Cc: serge@hallyn.com, linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, austindh.kim@gmail.com
Subject: [PATCH] landlock: Initialize kernel stack variables properly
Date: Wed, 3 Nov 2021 07:14:27 +0000 [thread overview]
Message-ID: <20211103071427.GA13854@raspberrypi> (raw)
In case kernel stack variables are not initialized properly, there might
be a little chance of kernel information disclosure. So it is better for
kernel stack variables to be initialized with null characters.
Signed-off-by: Austin Kim <austindh.kim@gmail.com>
---
security/landlock/syscalls.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/security/landlock/syscalls.c b/security/landlock/syscalls.c
index 32396962f04d..50a6f7091428 100644
--- a/security/landlock/syscalls.c
+++ b/security/landlock/syscalls.c
@@ -320,6 +320,8 @@ SYSCALL_DEFINE4(landlock_add_rule,
if (rule_type != LANDLOCK_RULE_PATH_BENEATH)
return -EINVAL;
+ memset(&path_beneath_attr, 0, sizeof(path_beneath_attr));
+
/* Copies raw user space buffer, only one type for now. */
res = copy_from_user(&path_beneath_attr, rule_attr,
sizeof(path_beneath_attr));
--
2.20.1
next reply other threads:[~2021-11-03 7:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-03 7:14 Austin Kim [this message]
2021-11-03 12:17 ` [PATCH] landlock: Initialize kernel stack variables properly Mickaël Salaün
2021-11-04 11:41 ` Austin Kim
2021-11-05 16:58 ` J Freyensee
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