linux-kernel - Re: [PATCH] Make /proc/<pid>/io world readable

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Message-ID: <20141211192911.GA3080@dztty>
Date:	Thu, 11 Dec 2014 20:29:11 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	Marcel Mol <marcel@...a.nl>
Cc:	akpm@...ux-foundation.org, adobriyan@...il.com,
	ebiederm@...ssion.com, oleg@...hat.com, luto@...capital.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make /proc/<pid>/io world readable

Hi,

On Thu, Dec 11, 2014 at 05:22:28PM +0100, Marcel Mol wrote:
> /proc/<pid>/io is only readable by the pid owner, while files
> like stat, statm and status are world readable.
> I see no reason why io statistics should be hidden.
> This patch makes io also world readable so process io counts
> can be analysed without root permissions.
As Andy noted this should be the other way around! so unless you have
a real usecase, this will revert previous patch by Vasiliy that closed
some info leaks...
https://lkml.org/lkml/2011/7/27/459

Thanks!

> Signed-off-by: Marcel Mol <marcel@...a.nl>
> ---
>  fs/proc/base.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 772efa4..7bd8dbe 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2563,7 +2563,7 @@ static const struct pid_entry tgid_base_stuff[] = {
>  	REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
>  #endif
>  #ifdef CONFIG_TASK_IO_ACCOUNTING
> -	ONE("io",	S_IRUSR, proc_tgid_io_accounting),
> +	ONE("io",	S_IRUGO, proc_tgid_io_accounting),
>  #endif
>  #ifdef CONFIG_HARDWALL
>  	ONE("hardwall",   S_IRUGO, proc_pid_hardwall),
> @@ -2904,7 +2904,7 @@ static const struct pid_entry tid_base_stuff[] = {
>  	REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
>  #endif
>  #ifdef CONFIG_TASK_IO_ACCOUNTING
> -	ONE("io",	S_IRUSR, proc_tid_io_accounting),
> +	ONE("io",	S_IRUGO, proc_tid_io_accounting),
>  #endif
>  #ifdef CONFIG_HARDWALL
>  	ONE("hardwall",   S_IRUGO, proc_pid_hardwall),
> -- 
> 1.9.3
> 
> 

-- 
Djalal Harouni
http://opendz.org
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