netdev - Re: [RFC] [PATCH] net: socket: Fix the wrong returns for recvmsg and sendmsg

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Message-ID: <20150602065257.GA29335@1wt.eu>
Date:	Tue, 2 Jun 2015 08:52:57 +0200
From:	Willy Tarreau <w@....eu>
To:	Junling Zheng <zhengjunling@...wei.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	David Miller <davem@...emloft.net>, lizefan@...wei.com,
	viro@...iv.linux.org.uk, xuhanbing@...wei.com,
	stable@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] net: socket: Fix the wrong returns for recvmsg and sendmsg

On Tue, Jun 02, 2015 at 02:43:54PM +0800, Junling Zheng wrote:
> On 2015/6/2 14:27, Greg KH wrote:
> > On Mon, Jun 01, 2015 at 10:23:57PM -0700, David Miller wrote:
> >> From: Junling Zheng <zhengjunling@...wei.com>
> >> Date: Tue, 2 Jun 2015 12:05:32 +0800
> >>
> >>> So, the problem commit is 281c9c36 (net: compat: Update
> >>> get_compat_msghdr() to match copy_msghdr_from_user() behaviour),
> >>> which fixes db31c55a6fb2 and brings the get_compat_msghdr() in line
> >>> with copy_msghdr_from_user().
> >>
> >> Upstream this got fixed by:
> >>
> >> 08adb7dabd4874cc5666b4490653b26534702ce0
> >>
> >> So the part that makes us not unconditionally return -EFAULT needs
> >> to be backported, and that's probably equivalent to the patch
> >> your proposed which therefore should be applied.
> > 
> > Ok, thanks, now applied.
> > 
> 
> Maybe other stable version also needs this fix:)

Yes, from what I'm seeing, at least 3.2 and 2.6.32 need it as well.

Thanks,
Willy

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