linux-kernel - Re: [PATCH 2/3] pstore: remove superfluous memory size check

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Date:	Tue, 13 Jan 2015 09:34:15 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Mark Salyzyn <salyzyn@...roid.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 2/3] pstore: remove superfluous memory size check

On Tue, Jan 6, 2015 at 9:15 AM, Mark Salyzyn <salyzyn@...roid.com> wrote:
> All previous checks will fail with error if memory size
> is not sufficient to register a zone, so this legacy
> check has become redundant.
>
> Signed-off-by: Mark Salyzyn <salyzyn@...roid.com>
> ---
>  fs/pstore/ram.c | 9 ---------
>  1 file changed, 9 deletions(-)
>
> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
> index 8613e5b..34ed8f8 100644
> --- a/fs/pstore/ram.c
> +++ b/fs/pstore/ram.c
> @@ -474,14 +474,6 @@ static int ramoops_probe(struct platform_device *pdev)
>         if (err)
>                 goto fail_init_fprz;
>
> -       if (!cxt->przs && !cxt->cprz && !cxt->fprz) {
> -               pr_err("memory size too small, minimum is %zu\n",
> -                       cxt->console_size + cxt->record_size +
> -                       cxt->ftrace_size);
> -               err = -EINVAL;
> -               goto fail_cnt;
> -       }
> -

Yup, good call. ramoops_init_przs and ramoops_init_prz do all the
checks already.

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

-Kees

>         cxt->pstore.data = cxt;
>         /*
>          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
> @@ -525,7 +517,6 @@ fail_buf:
>         kfree(cxt->pstore.buf);
>  fail_clear:
>         cxt->pstore.bufsize = 0;
> -fail_cnt:
>         kfree(cxt->fprz);
>  fail_init_fprz:
>         kfree(cxt->cprz);
> --
> 2.2.0.rc0.207.ga3a616c
>



-- 
Kees Cook
Chrome OS Security
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