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

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Message-ID: <OF542E7A59.842197B0-ONC1257D19.004B7FF4-C1257D19.004BECA2@transmode.se>
Date:	Fri, 18 Jul 2014 15:49:17 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Richard Weinberger <richard.weinberger@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ls -l /proc/1/exe -> Permission denied

Richard Weinberger <richard.weinberger@...il.com> wrote on 2014/07/18 
14:58:30:
> 
> On Thu, Jul 17, 2014 at 1:18 PM, Joakim Tjernlund
> <joakim.tjernlund@...nsmode.se> wrote:
> > 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?
> 
> Why do you think this is unexpected?

It only shows the full path to the executable, compare with comm which 
shows basename(app).

I have an idea for qemu-user which needs to identify which processes
are running /usr/bin/qemu-<arch> and which are not so it knows how
to munge different /proc/ files.

 Jocke
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