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  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:	Wed, 30 Apr 2014 21:40:55 +0100
From:	Zoltan Kiss <>
To:	Eric Dumazet <>,
	Sander Eikelenboom <>
CC:	Ian Campbell <>,
	"David S. Miller" <>, <>,
Subject: Re: [3.15-rc3] Bisected: xen-netback mangles packets between two
 guests on a bridge since merge of "TX grant mapping with SKBTX_DEV_ZEROCOPY
 instead of copy" series.

On 30/04/14 16:24, Eric Dumazet wrote:
> On Wed, 2014-04-30 at 12:45 +0200, Sander Eikelenboom wrote:
> This looks like skb->data_len is not properly set
> (Small note :
> alloc_page(GFP_ATOMIC|__GFP_COLD) should be a plain
> alloc_page(GFP_ATOMIC) : We prefer a page that has been used recently to
> avoid cache misses if possible.
> )
> This probably confuses skb_try_coalesce()
> My guess is xenvif_get_requests() forgets to init nskb->len /
> nskb->data_len for the skb that is attached to frag_list
xenvif_get_requests() calls alloc_skb() which inits these values to zero
> So the "skb->data_len += nskb->len;" at line 1353 is probably a nop.

To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists