linux-kernel - Re: [PATCH RESEND] coredump: Ensure proper size of sparse core files

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Message-ID: <20170117075521.GA19654@infradead.org>
Date:   Mon, 16 Jan 2017 23:55:21 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     David Miller <davem@...emloft.net>
Cc:     dave.kleikamp@...cle.com, viro@...iv.linux.org.uk,
        sparclinux@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] coredump: Ensure proper size of sparse core files

On Mon, Jan 16, 2017 at 10:42:43PM -0500, David Miller wrote:
> The lseek() done by dump_skip() should extend the file properly.

lseek never extends a file.  It just moves the current file position.
So if you do not have a write after the lseek it does nothing.