linux-kernel - Re: [PATCH] stmmac: explicitly zero des0 & des1 on init

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]

Date:	Sun, 21 Jun 2015 09:29:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Alexey.Brodkin@...opsys.com
Cc:	netdev@...r.kernel.org, peppe.cavallaro@...com,
	arc-linux-dev@...opsys.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] stmmac: explicitly zero des0 & des1 on init

From: Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Date: Tue, 16 Jun 2015 20:40:41 +0300

> Current implementtion of descriptor init procedure only takes care about
> ownership flag. While it is perfectly possible to have underlying memory
> filled with garbage on boot or driver installation.
> 
> And randomly set flags in non-zeroed des0 and des1 fields may lead to
> unpredictable behavior of the GMAC DMA block.
> 
> Solution to this problem is as simple as explicit zeroing of both des0
> and des1 fields of all buffer descriptors.
> 
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>

If you need the memory zero initialized, use dma_zalloc_coherent().
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
Please read the FAQ at  http://www.tux.org/lkml/