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  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, 16 Aug 2020 19:10:15 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Pascal Bouchareine <kalou@....net>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] mm: add GFP mask param to strndup_user

On Sat, Aug 15, 2020 at 11:42:10PM +0100, Al Viro wrote:
> On Sat, Aug 15, 2020 at 11:23:43AM -0700, Pascal Bouchareine wrote:
> > Let caller specify allocation.
> > Preserve existing calls with GFP_USER.
> 
> Bloody bad idea, unless you slap a BUG_ON(flags & GFP_ATOMIC) on it,
> to make sure nobody tries _that_.  Note that copying from userland
> is an inherently blocking operation, and this interface invites
> just that.
> 
> What do you need that flag for, anyway?

You need it for kmem accounting.

Powered by blists - more mailing lists