From: Christoph Hellwig <hch@lst.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
David Laight <David.Laight@aculab.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Luis Chamberlain <mcgrof@kernel.org>,
Kees Cook <keescook@chromium.org>,
Iurii Zaikin <yzaikin@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH 03/11] fs: add new read_uptr and write_uptr file operations
Date: Tue, 30 Jun 2020 09:04:34 +0200 [thread overview]
Message-ID: <20200630070434.GA28654@lst.de> (raw)
In-Reply-To: <CAHk-=whE2_YcRRQhJ73s4kYqTNDkYqq2HHtieQ-R1J+Awgk=nA@mail.gmail.com>
Next fund one, in net/ipv6/ip6_flowlabel.c:ipv6_flowlabel_opt() we
have this gem toward the end:
if (!freq->flr_label) {
if (copy_to_user(&((struct in6_flowlabel_req __user *)optval)->flr_label,
&fl->label, sizeof(fl->label))) {
/* Intentionally ignore fault. */
so it writes back to what was supposed to be the input parameter,
and only does it for a partial region. Not sure how we could handle
that with any kind of copy to kernel in the caller scheme?
next prev parent reply other threads:[~2020-06-30 7:04 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-24 16:28 [RFC] stop using ->read and ->write for kernel access Christoph Hellwig
2020-06-24 16:28 ` [PATCH 01/11] uptr: add a new "universal pointer" type Christoph Hellwig
2020-06-24 16:28 ` [PATCH 02/11] fs: factor out a set_fmode_can_read_write helper Christoph Hellwig
2020-06-24 16:28 ` [PATCH 03/11] fs: add new read_uptr and write_uptr file operations Christoph Hellwig
2020-06-24 17:19 ` Linus Torvalds
2020-06-24 17:55 ` Christoph Hellwig
2020-06-24 18:11 ` Linus Torvalds
2020-06-24 18:14 ` Christoph Hellwig
2020-06-24 18:20 ` Linus Torvalds
2020-06-24 18:24 ` Christoph Hellwig
2020-06-24 18:29 ` Matthew Wilcox
2020-06-24 18:31 ` Christoph Hellwig
2020-06-24 18:15 ` Linus Torvalds
2020-06-27 10:49 ` David Laight
2020-06-27 16:33 ` Linus Torvalds
2020-06-29 8:21 ` David Laight
2020-06-29 15:29 ` Christoph Hellwig
2020-06-29 17:02 ` Linus Torvalds
2020-06-29 18:07 ` Christoph Hellwig
2020-06-29 18:29 ` Linus Torvalds
2020-06-29 18:36 ` Christoph Hellwig
2020-06-29 19:10 ` Linus Torvalds
2020-06-30 7:04 ` Christoph Hellwig [this message]
2020-06-30 7:51 ` David Laight
2020-07-08 5:14 ` Luis Chamberlain
2020-06-24 17:56 ` Matthew Wilcox
2020-06-24 17:59 ` Christoph Hellwig
2020-06-24 18:37 ` Christoph Hellwig
2020-06-24 18:43 ` Matthew Wilcox
2020-06-24 16:28 ` [PATCH 04/11] sysctl: switch to ->{read,write}_uptr Christoph Hellwig
2020-06-24 16:28 ` [PATCH 05/11] fs: refactor new_sync_read Christoph Hellwig
2020-06-24 16:28 ` [PATCH 06/11] proc: add a read_iter method to proc proc_ops Christoph Hellwig
2020-06-24 16:28 ` [PATCH 07/11] seq_file: add seq_read_iter Christoph Hellwig
2020-06-24 16:28 ` [PATCH 08/11] seq_file: switch over direct seq_read method calls to seq_read_iter Christoph Hellwig
2020-06-24 16:28 ` [PATCH 09/11] proc: " Christoph Hellwig
2020-06-24 16:29 ` [PATCH 10/11] fs: don't allow kernel reads and writes using ->read and ->write Christoph Hellwig
2020-06-24 16:29 ` [PATCH 11/11] fs: don't allow splice read/write without explicit ops Christoph Hellwig
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