linux-kernel - [PATCH v2 1/2] misc: c2port: core: Make copying name from userspace more secure

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-next>] [day] [month] [year] [list]

Date:   Mon,  2 Nov 2020 14:20:00 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     gregkh@...uxfoundation.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Rodolfo Giometti <giometti@...eenne.com>,
        "Eurotech S.p.A" <info@...otech.it>,
        David Laight <David.Laight@...lab.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 1/2] misc: c2port: core: Make copying name from userspace more secure

Currently the 'c2dev' device data is not initialised when it's
allocated.  There maybe an issue when using strncpy() to populate the
'name' attribute since a NUL terminator may not be provided in all
use-cases.  To prevent such a failing, let's ensure the 'c2dev'
device data area is fully zeroed out on allocation.

Cc: Rodolfo Giometti <giometti@...eenne.com>
Cc: "Eurotech S.p.A" <info@...otech.it>
Cc: David Laight <David.Laight@...lab.com>
Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/misc/c2port/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
index 80d87e8a0bea9..fb9a1b49ff6de 100644
--- a/drivers/misc/c2port/core.c
+++ b/drivers/misc/c2port/core.c
@@ -899,7 +899,7 @@ struct c2port_device *c2port_device_register(char *name,
 		unlikely(!ops->c2d_get) || unlikely(!ops->c2d_set))
 		return ERR_PTR(-EINVAL);
 
-	c2dev = kmalloc(sizeof(struct c2port_device), GFP_KERNEL);
+	c2dev = kzalloc(sizeof(struct c2port_device), GFP_KERNEL);
 	if (unlikely(!c2dev))
 		return ERR_PTR(-ENOMEM);
 
-- 
2.25.1