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:	Tue, 11 Mar 2014 06:12:23 +0800
From:	Herbert Xu <>
To:	"Michael S. Tsirkin" <>
	David Miller <>,
	Eric Dumazet <>,
	Daniel Borkmann <>,
	Simon Horman <>,
	Paul Durrant <>,
	Thomas Graf <>, Miklos Szeredi <>,
	=?UTF-8?q?Peter=20Pan=28=E6=BD=98=E5=8D=AB=E5=B9=B3=29?= <>,
Subject: Re: [PATCH 5/5] skbuff: skb_segment: orphan frags before copying

On Tue, Mar 11, 2014 at 12:07:17AM +0200, Michael S. Tsirkin wrote:
> Once one skb completes the callback is invoked and userspace
> reuses this buffer for something else.
> At that point it's too late to do the copy.

OK, would it be possible to delay the callback until all generated
skbs are completed?

> > IOW if we pass along SKBTX_SHARED_FRAG will it work?
> I don't see how would SKBTX_SHARED_FRAG help with this at all.
> That only works for pages gifted to kernel by e.g. vmsplice
> that aren't reused by userspace.

Sorry cut-n-paste error, I meant SKBTX_DEV_ZEROCOPY.

Email: Herbert Xu <>
Home Page:
PGP Key:
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists