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Message-ID: <CAFLxGvyAzUwMqi5vAGzoUoP6J4m+6FGC-J4=zKG2ZGguTgO8cg@mail.gmail.com> Date: Sun, 20 Jul 2014 13:06:30 +0200 From: Richard Weinberger <richard.weinberger@...il.com> To: Andreas Schwab <schwab@...ux-m68k.org> Cc: Joakim Tjernlund <joakim.tjernlund@...nsmode.se>, LKML <linux-kernel@...r.kernel.org> Subject: Re: ls -l /proc/1/exe -> Permission denied On Sun, Jul 20, 2014 at 12:55 PM, Andreas Schwab <schwab@...ux-m68k.org> wrote: > 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. Do you have an example? I'm asking because an attacker could make any symlink as he wants to. A ln -s /etc/shadow lala still does not give me access to shadow... -- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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