linux-kernel - Re: [PATCH v2 1/2] um: Set secure access mode for temporary file

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Message-ID: <CADNZ+wSJtq9Ymx-2YcYe5XwwXTmMdbtsuBz6JHotnnwH3G7GKg@mail.gmail.com>
Date:	Fri, 4 Dec 2015 12:13:12 -0500
From:	Tristan Schmelcher <tschmelcher@...gle.com>
To:	Mickaël Salaün <mic@...ikod.net>
Cc:	linux-kernel@...r.kernel.org, Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	user-mode-linux-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	user-mode-linux-user@...ts.sourceforge.net
Subject: Re: [PATCH v2 1/2] um: Set secure access mode for temporary file

File permissions are checked at time of open, so I think this fchmod
call has never had any effect.

If there is a concern that the mkstemp implementation may be insecure,
why not set and restore the umask?
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