linux-kernel - Re: [PATCH 2/2] um: Use race-free temporary file creation

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Message-ID: <565A258D.4040206@nod.at>
Date:	Sat, 28 Nov 2015 23:07:09 +0100
From:	Richard Weinberger <richard@....at>
To:	Mickaël Salaün <mic@...ikod.net>,
	linux-kernel@...r.kernel.org
Cc:	Jeff Dike <jdike@...toit.com>,
	Tristan Schmelcher <tschmelcher@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	user-mode-linux-devel@...ts.sourceforge.net,
	user-mode-linux-user@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] um: Use race-free temporary file creation

Am 28.11.2015 um 22:32 schrieb Mickaël Salaün:
> Open the memory mapped file with the O_TMPFILE flag when available.
> 
> Signed-off-by: Mickaël Salaün <mic@...ikod.net>
> ---
>  arch/um/os-Linux/mem.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
> index 798aeb4..fe52e2d 100644
> --- a/arch/um/os-Linux/mem.c
> +++ b/arch/um/os-Linux/mem.c
> @@ -106,6 +106,18 @@ static int __init make_tempfile(const char *template)
>  		}
>  	}
>  
> +#ifdef O_TMPFILE
> +	fd = open(tempdir, O_CLOEXEC | O_RDWR | O_EXCL | O_TMPFILE, 0700);
> +	/*
> +	 * If the running system does not support O_TMPFILE flag then retry
> +	 * without it.
> +	 */
> +	if (fd != -1 || (errno != EINVAL && errno != EISDIR &&

Why are you handling EISDIR?

> +			errno != EOPNOTSUPP))
> +		return fd;
> +	errno = 0;

Why are you resetting errno?

Thanks,
//richard
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