Re: /proc filesystem allows bypassing directory permissions on LinuxFrom: 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.
f.anthony.n.finch <dot () dotat at> http://dotat.at/
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