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Re: [Xen-devel] [PATCH for-4.5] tools/pygrub: Fix TOCTOU race introduced by c/s 63dcc68

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Olaf Hering <olaf@xxxxxxxxx>
Date: Wed, 29 Oct 2014 17:03:22 +0100
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
Delivery-date: Wed, 29 Oct 2014 16:03:54 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Wed, Oct 29, Andrew Cooper wrote:

> In addition, use os.makedirs() which will also create intermediate directories
> if they don't exist.

Can this happen in practice, given that /var/run/xen is created by the
runlevel scripts already? The mkdir is now really just @XEN_RUN_DIR@/pygrub.

Olaf

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