linux-kernel - Re: [PATCH v2] proc_sysctl: fix oops caused by incorrect command parameters.

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Message-ID: <20210111142131.GA22493@dhcp22.suse.cz>
Date:   Mon, 11 Jan 2021 15:21:31 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Xiaoming Ni <nixiaoming@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, mcgrof@...nel.org,
        yzaikin@...gle.com, adobriyan@...il.com,
        linux-fsdevel@...r.kernel.org, vbabka@...e.cz, wangle6@...wei.com
Subject: Re: [PATCH v2] proc_sysctl: fix oops caused by incorrect command
 parameters.

On Mon 11-01-21 11:48:19, Xiaoming Ni wrote:
[...]
> patch3:
> 	+++ b/fs/proc/proc_sysctl.c
> 	@@ -1770,6 +1770,9 @@ static int process_sysctl_arg(char *param, char *val,
> 							return 0;
> 			}
> 
> 	+       if (!val)
> 	+               return -EINVAL;
> 	+
> 			/*
> 			 * To set sysctl options, we use a temporary mount of proc, look up the
> 			 * respective sys/ file and write to it. To avoid mounting it when no
> 
> sysctl log for patch3:
> 	Setting sysctl args: `' invalid for parameter `hung_task_panic'
[...]
> When process_sysctl_arg() is called, the param parameter may not be the
> sysctl parameter.
> 
> Patch3 or patch4, which is better?

Patch3

-- 
Michal Hocko
SUSE Labs