linux-kernel - Re: [PATCH 1/9] pstore/zone: cap the maximum device size

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Date:   Sun, 8 Nov 2020 22:05:16 +0800
From:   廖威雄 <gmpy.liaowx@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        WeiXiong Liao <liaoweixiong@...winnertech.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] pstore/zone: cap the maximum device size

On Fri, Oct 16, 2020 at 9:27 PM Christoph Hellwig <hch@....de> wrote:
>
> Introduce an abritrary 128MiB cap to avoid malloc failures when using
> a larger block device.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/pstore/zone.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
> index 3ce89216670c9b..5266ccbec007f3 100644
> --- a/fs/pstore/zone.c
> +++ b/fs/pstore/zone.c
> @@ -1299,6 +1299,10 @@ int register_pstore_zone(struct pstore_zone_info *info)
>                 pr_warn("total_size must be >= 4096\n");
>                 return -EINVAL;
>         }
> +       if (info->total_size > SZ_128M) {
> +               pr_warn("capping size to 128MiB\n");
> +               info->total_size = SZ_128M;
> +       }
>

Reviewed-by: WeiXiong Liao <gmpy.liaowx@...il.com>


>         if (!info->kmsg_size && !info->pmsg_size && !info->console_size &&
>             !info->ftrace_size) {
> --
> 2.28.0
>