linux-kernel - Re: ls -l /proc/1/exe -> Permission denied

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Message-ID: <87fvhwxps6.fsf@igel.home>
Date:	Sun, 20 Jul 2014 12:55:53 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ls -l  /proc/1/exe -> Permission denied

Joakim Tjernlund <joakim.tjernlund@...nsmode.se> writes:

> Andreas Schwab <schwab@...ux-m68k.org> wrote on 2014/07/19 22:21:59:
>> 
>> Joakim Tjernlund <joakim.tjernlund@...nsmode.se> writes:
>> 
>> > Trying to real /proc/<pid>/exe I noticed I could not read links not 
>> > belonging to my user such as:
>> > jocke >  ls -l /proc/1/exe
>> >              ls: cannot read symbolic link /proc/1/exe: Permission 
> denied
>> >
>> > Is this expected?
>> 
>> Yes.  This information is considered private.
>
> I don't understand why though.

It would allow bypassing access restrictions.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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