linux-kernel - [PATCH] i2o/i2o_config: Validate message size

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>] [day] [month] [year] [list]

Date:	Sat,  2 Mar 2013 08:09:21 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] i2o/i2o_config: Validate message size

Message size was already validated against inbound_frame_size, but that does
not guarantee that it is small enough for the buffer used to store a copy of it
on the stack.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
I am also not sure if the previous validation can be trusted, since the size
is read again from user space after the initial validation.

 drivers/message/i2o/i2o_config.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/message/i2o/i2o_config.c b/drivers/message/i2o/i2o_config.c
index 5451bef..aabaafc 100644
--- a/drivers/message/i2o/i2o_config.c
+++ b/drivers/message/i2o/i2o_config.c
@@ -922,6 +922,10 @@ static int i2o_cfg_passthru(unsigned long arg)
 		}
 		size = size >> 16;
 		size *= 4;
+		if (size > sizeof(rmsg)) {
+			rcode = -EFAULT;
+			goto sg_list_cleanup;
+		}
 		/* Copy in the user's I2O command */
 		if (copy_from_user(rmsg, user_msg, size)) {
 			rcode = -EFAULT;
-- 
1.7.9.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/