lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sun, 20 Jul 2014 13:51:31 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Richard Weinberger <richard.weinberger@...il.com>
Cc:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ls -l /proc/1/exe -> Permission denied

Richard Weinberger <richard.weinberger@...il.com> writes:

> 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?

proc symlinks are special because they actually resolve to the inode.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
--
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/

Powered by blists - more mailing lists