linux-kernel - Re: [PATCH v3 1/4] kernfs: kvmalloc xattr value instead of kmalloc

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]

Message-ID: <CALvZod6TxCGiJbPo-4R_qXC7OqWS0LgRRWZwvbaPbWMDRyt0Zg@mail.gmail.com>
Date:   Thu, 12 Mar 2020 14:03:46 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Daniel Xu <dxu@...uu.xyz>
Cc:     Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v3 1/4] kernfs: kvmalloc xattr value instead of kmalloc

On Thu, Mar 12, 2020 at 1:03 PM Daniel Xu <dxu@...uu.xyz> wrote:
>
> xattr values have a 64k maximum size. This can result in an order 4
> kmalloc request which can be difficult to fulfill. Since xattrs do not
> need physically contiguous memory, we can switch to kvmalloc and not
> have to worry about higher order allocations failing.
>
> Signed-off-by: Daniel Xu <dxu@...uu.xyz>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>