linux-kernel - Re: [PATCH] pstore: use memdup

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]

Date:   Tue, 27 Jun 2017 17:07:41 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Geliang Tang <geliangtang@...il.com>
Cc:     Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pstore: use memdup_user

On Fri, Apr 28, 2017 at 6:45 PM, Geliang Tang <geliangtang@...il.com> wrote:
> Use memdup_user() helper instead of open-coding to simplify the code.
>
> Signed-off-by: Geliang Tang <geliangtang@...il.com>

Thanks! Applied for -next.

-Kees

> ---
>  fs/pstore/platform.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
> index 43b3ca5..903e0fe 100644
> --- a/fs/pstore/platform.c
> +++ b/fs/pstore/platform.c
> @@ -640,19 +640,16 @@ static int pstore_write_user_compat(struct pstore_record *record,
>         if (record->buf)
>                 return -EINVAL;
>
> -       record->buf = kmalloc(record->size, GFP_KERNEL);
> -       if (!record->buf)
> -               return -ENOMEM;
> -
> -       if (unlikely(copy_from_user(record->buf, buf, record->size))) {
> -               ret = -EFAULT;
> +       record->buf = memdup_user(buf, record->size);
> +       if (unlikely(IS_ERR(record->buf))) {
> +               ret = PTR_ERR(record->buf);
>                 goto out;
>         }
>
>         ret = record->psi->write(record);
>
> -out:
>         kfree(record->buf);
> +out:
>         record->buf = NULL;
>
>         return unlikely(ret < 0) ? ret : record->size;
> --
> 2.9.3
>



-- 
Kees Cook
Pixel Security