linux-kernel - Re: [PATCH v2 0/7] pipe: buffer limits fixes and cleanups

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Date:   Thu, 11 Jan 2018 12:36:15 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Eric Biggers <ebiggers3@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Willy Tarreau <w@....eu>,
        Mikulas Patocka <mpatocka@...hat.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/7] pipe: buffer limits fixes and cleanups

On Wed, Jan 10, 2018 at 9:28 PM, Eric Biggers <ebiggers3@...il.com> wrote:
> This series simplifies the sysctl handler for pipe-max-size and fixes
> another set of bugs related to the pipe buffer limits:
>
> - The root user wasn't allowed to exceed the limits when creating new
>   pipes.
>
> - There was an off-by-one error when checking the limits, so a limit of
>   N was actually treated as N - 1.
>
> - F_SETPIPE_SZ accepted values over UINT_MAX.
>
> - Reading the pipe buffer limits could be racy.
>
> Changed since v1:
>
>   - Added "Fixes" tag to "pipe: fix off-by-one error when checking buffer limits"
>   - In pipe_set_size(), checked 'nr_pages' rather than 'size'
>   - Fixed commit message for "pipe: simplify round_pipe_size()"

Thanks for the fixes! This looks good to me. Please consider the whole series:

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

>
> Eric Biggers (7):
>   pipe, sysctl: drop 'min' parameter from pipe-max-size converter
>   pipe, sysctl: remove pipe_proc_fn()
>   pipe: actually allow root to exceed the pipe buffer limits
>   pipe: fix off-by-one error when checking buffer limits
>   pipe: reject F_SETPIPE_SZ with size over UINT_MAX
>   pipe: simplify round_pipe_size()
>   pipe: read buffer limits atomically
>
>  fs/pipe.c                 | 57 ++++++++++++++++++++---------------------------
>  include/linux/pipe_fs_i.h |  5 ++---
>  include/linux/sysctl.h    |  3 ---
>  kernel/sysctl.c           | 33 +++++----------------------
>  4 files changed, 32 insertions(+), 66 deletions(-)
>
> --
> 2.15.1
>



-- 
Kees Cook
Pixel Security