linux-kernel - Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

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]

Date:   Tue, 03 Mar 2020 14:19:58 +0000
From:   David Howells <dhowells@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     dhowells@...hat.com, Miklos Szeredi <miklos@...redi.hu>,
        Karel Zak <kzak@...hat.com>, Ian Kent <raven@...maw.net>,
        Christian Brauner <christian.brauner@...ntu.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> +	fd = do_sys_open(dfd, filename, flags, 0000);
> +	if (fd <= 0)
> +		return fd;
> +
> +	retval = ksys_read(fd, buffer, bufsize);
> +
> +	__close_fd(current->files, fd);

If you can use dentry_open() and vfs_read(), you might be able to avoid
dealing with file descriptors entirely.  That might make it worth a syscall.

You're going to be asked for writefile() you know ;-)

David