linux-kernel - Re: Race-free unlinking of directory entries

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180409095919.GA9621@infradead.org>
Date:   Mon, 9 Apr 2018 02:59:19 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jan Kara <jack@...e.cz>
Subject: Re: Race-free unlinking of directory entries

On Mon, Apr 09, 2018 at 09:42:41AM +0200, Pali Rohár wrote:
> Hi! I would like to remind this my older email about race free
> unlinking. Is there any plan to provide such support?

Given that in Linux we know which directory entry a given fd refers to,
we shouldn't even need a new syscall, but simply support the
AT_EMPTY_PATH flag for funlinkat.