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Re: /proc filesystem allows bypassing directory permissions on Linux
From: Tony Finch <dot () dotat at>
Date: Tue, 27 Oct 2009 11:29:44 +0000

On Mon, 26 Oct 2009, Matthew Dempsky wrote:
On Mon, Oct 26, 2009 at 9:01 AM, Tony Finch <dot () dotat at> wrote:

Attacker uses openat() to open and modify the "private" file.

At least with Linux 2.6.18, you still need +x permission on the
directory to access its contents using openat(2).

According to POSIX, if you open the directory with O_SEARCH then openat()
does not re-check search (+x) permissions.

Tony.
-- 
f.anthony.n.finch  <dot () dotat at>  http://dotat.at/
GERMAN BIGHT HUMBER: SOUTHWEST 5 TO 7. MODERATE OR ROUGH. SQUALLY SHOWERS.
MODERATE OR GOOD.


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