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From: =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@digikod.net>
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Date: Sun, 6 Dec 2015 12:57:54 +0100
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Sender: linux-kernel-owner@vger.kernel.org
Subject: Re: [PATCH v2 1/2] um: Set secure access mode for temporary file
To: Tristan Schmelcher <tschmelcher@google.com>
Cc: linux-kernel@vger.kernel.org, Jeff Dike <jdike@addtoit.com>, Richard Weinberger <richard@nod.at>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, user-mode-linux-devel <user-mode-linux-devel@lists.sourceforge.net>, user-mode-linux-user@lists.sourceforge.net
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On 06/12/2015 12:32, Micka=C3=ABl Sala=C3=BCn wrote:
> On 04/12/2015 18:13, Tristan Schmelcher wrote:
>> File permissions are checked at time of open, so I think this fchmod
>> call has never had any effect.
>=20
> Indeed, mmap doesn't require the file to be executable, only readable a=
nd writable. The fchmod seems to be a guarantee for this permissions but =
I don't see why a file newly created could not be writable.

The fchmod may be useful if the umask is 0777 :)

 Micka=C3=ABl


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