linux-kernel - Re: [PATCH v2 1/2] wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_config

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

Message-ID: <Zw7f0FTlGk__kE6e@google.com>
Date: Tue, 15 Oct 2024 14:34:08 -0700
From: Brian Norris <briannorris@...omium.org>
To: Alper Nebi Yasak <alpernebiyasak@...il.com>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Francesco Dolcini <francesco@...cini.it>,
	Johannes Berg <johannes.berg@...el.com>,
	Kees Cook <kees@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
	Dmitry Antipov <dmantipov@...dex.ru>,
	"Gustavo A . R . Silva" <gustavoars@...nel.org>,
	Jeff Johnson <quic_jjohnson@...cinc.com>,
	David Lin <yu-hao.lin@....com>, linux-hardening@...r.kernel.org,
	Kalle Valo <kvalo@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 1/2] wifi: mwifiex: Fix memcpy() field-spanning write
 warning in mwifiex_config_scan()

On Tue, Oct 08, 2024 at 01:20:54AM +0300, Alper Nebi Yasak wrote:
> Replace one-element array with a flexible-array member in `struct
> mwifiex_ie_types_wildcard_ssid_params` to fix the following warning
> on a MT8173 Chromebook (mt8173-elm-hana):
> 
> [  356.775250] ------------[ cut here ]------------
> [  356.784543] memcpy: detected field-spanning write (size 6) of single field "wildcard_ssid_tlv->ssid" at drivers/net/wireless/marvell/mwifiex/scan.c:904 (size 1)
> [  356.813403] WARNING: CPU: 3 PID: 742 at drivers/net/wireless/marvell/mwifiex/scan.c:904 mwifiex_scan_networks+0x4fc/0xf28 [mwifiex]
> 
> The "(size 6)" above is exactly the length of the SSID of the network
> this device was connected to. The source of the warning looks like:
> 
>     ssid_len = user_scan_in->ssid_list[i].ssid_len;
>     [...]
>     memcpy(wildcard_ssid_tlv->ssid,
>            user_scan_in->ssid_list[i].ssid, ssid_len);
> 
> There is a #define WILDCARD_SSID_TLV_MAX_SIZE that uses sizeof() on this
> struct, but it already didn't account for the size of the one-element
> array, so it doesn't need to be changed.
> 
> Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
> Signed-off-by: Alper Nebi Yasak <alpernebiyasak@...il.com>

For patch 1:

Acked-by: Brian Norris <briannorris@...omium.org>