linux-kernel - Re: [PATCH] proc: fix mount -t proc -o AAA

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Message-Id: <201203231945.19501.a.miskiewicz@gmail.com>
Date:	Fri, 23 Mar 2012 19:45:19 +0100
From:	Arkadiusz Miśkiewicz <a.miskiewicz@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] proc: fix mount -t proc -o AAA

On Friday 23 of March 2012, Vasiliy Kulikov wrote:

> Thanks for the report.  Please test the following patch.

Seems to be working fine, now - thanks!



> 
> --------------------------------------------------------------
> From: Vasiliy Kulikov <segoon@...nwall.com>
> Date: Fri, 23 Mar 2012 20:56:42 +0400
> Subject: [PATCH] proc: fix mount -t proc -o AAA
> 
> proc_parse_options() inside of proc_mount() runs only once at the boot
> time without any given options.  So, following umount(2)+mount(2) ignore
> mount options: proc_parse_options() is not called as ->s_root is already
> initialized.  To fix that parse mount options unconditionally.
> 
> Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
> Reported-by: Arkadiusz Miśkiewicz <a.miskiewicz@...il.com>
> ---
>  fs/proc/root.c |    9 +++++----
>  1 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/proc/root.c b/fs/proc/root.c
> index 46a15d8..eed44bf 100644
> --- a/fs/proc/root.c
> +++ b/fs/proc/root.c
> @@ -115,12 +115,13 @@ static struct dentry *proc_mount(struct
> file_system_type *fs_type, if (IS_ERR(sb))
>  		return ERR_CAST(sb);
> 
> +	if (!proc_parse_options(options, ns)) {
> +		deactivate_locked_super(sb);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
>  	if (!sb->s_root) {
>  		sb->s_flags = flags;
> -		if (!proc_parse_options(options, ns)) {
> -			deactivate_locked_super(sb);
> -			return ERR_PTR(-EINVAL);
> -		}
>  		err = proc_fill_super(sb);
>  		if (err) {
>  			deactivate_locked_super(sb);


-- 
Arkadiusz Miśkiewicz        PLD/Linux Team
arekm / maven.pl            http://ftp.pld-linux.org/
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