linux-kernel - Re: cred_guard_mutex vs seq_file::lock [was: Re: 3.14.0+/x86: lockdep and mutexes not getting along]

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Message-ID: <20140730230302.GA22779@node.dhcp.inet.fi>
Date:	Thu, 31 Jul 2014 02:03:02 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Al Viro <viro@...IV.linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>
Cc:	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Michael L. Semon" <mlsemon35@...il.com>,
	Ingo Molnar <mingo@...nel.org>, jason.low2@...com,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: cred_guard_mutex vs seq_file::lock [was: Re: 3.14.0+/x86:
 lockdep and mutexes not getting along]

On Thu, Jul 31, 2014 at 01:31:30AM +0300, Kirill A. Shutemov wrote:
> I don't know why we allow "chmod +x" on some proc files, notably net-related.
> Is it a bug?

# ls -l /proc/{1,157}/net/packet
-r--r--r-- 1 root 0 0 Jul 30 23:01 /proc/1/net/packet
-r--r--r-- 1 root 0 0 Jul 30 23:01 /proc/157/net/packet
# chmod +x /proc/157/net/packet
# ls -l /proc/{1,157}/net/packet
-r-xr-xr-x 1 root 0 0 Jul 30 23:02 /proc/1/net/packet
-r-xr-xr-x 1 root 0 0 Jul 30 23:02 /proc/157/net/packet

Ouch.. Or is it expected?

-- 
 Kirill A. Shutemov
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