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From: Matthew Wilcox <willy@infradead.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ian Kent <raven@themaw.net>, David Howells <dhowells@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-security-module@vger.kernel.org,
netfilter-devel@vger.kernel.org
Subject: Re: [PATCH 05/13] fs: check FMODE_WRITE in __kernel_write
Date: Mon, 15 Jun 2020 05:34:39 -0700 [thread overview]
Message-ID: <20200615123439.GT8681@bombadil.infradead.org> (raw)
In-Reply-To: <20200615121257.798894-6-hch@lst.de>
On Mon, Jun 15, 2020 at 02:12:49PM +0200, Christoph Hellwig wrote:
> We still need to check if the fѕ is open write, even for the low-level
> helper.
Do we need the analogous check for FMODE_READ in the __kernel_read()
patch?
> @@ -505,6 +505,8 @@ ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t
> const char __user *p;
> ssize_t ret;
>
> + if (!(file->f_mode & FMODE_WRITE))
> + return -EBADF;
> if (!(file->f_mode & FMODE_CAN_WRITE))
> return -EINVAL;
>
> --
> 2.26.2
>
next prev parent reply other threads:[~2020-06-15 12:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-15 12:12 clean up kernel_{read,write} & friends v4 Christoph Hellwig
2020-06-15 12:12 ` [PATCH 01/13] cachefiles: switch to kernel_write Christoph Hellwig
2020-06-15 12:12 ` [PATCH 02/13] autofs: " Christoph Hellwig
2020-06-15 12:12 ` [PATCH 03/13] bpfilter: " Christoph Hellwig
2020-06-15 12:12 ` [PATCH 04/13] fs: unexport __kernel_write Christoph Hellwig
2020-06-15 12:12 ` [PATCH 05/13] fs: check FMODE_WRITE in __kernel_write Christoph Hellwig
2020-06-15 12:34 ` Matthew Wilcox [this message]
2020-06-15 13:48 ` Christoph Hellwig
2020-06-15 16:39 ` Linus Torvalds
2020-06-15 16:42 ` Christoph Hellwig
2020-06-17 14:59 ` David Laight
2020-06-15 12:12 ` [PATCH 06/13] fs: implement kernel_write using __kernel_write Christoph Hellwig
2020-06-15 12:12 ` [PATCH 07/13] fs: remove __vfs_write Christoph Hellwig
2020-06-15 12:12 ` [PATCH 08/13] fs: don't change the address limit for ->write_iter in __kernel_write Christoph Hellwig
2020-06-15 12:12 ` [PATCH 09/13] fs: add a __kernel_read helper Christoph Hellwig
2020-06-15 12:12 ` [PATCH 10/13] integrity/ima: switch to using __kernel_read Christoph Hellwig
2020-06-15 16:46 ` Linus Torvalds
2020-06-15 16:56 ` Linus Torvalds
2020-06-15 12:12 ` [PATCH 11/13] fs: implement kernel_read " Christoph Hellwig
2020-06-15 12:12 ` [PATCH 12/13] fs: remove __vfs_read Christoph Hellwig
2020-06-15 12:12 ` [PATCH 13/13] fs: don't change the address limit for ->read_iter in __kernel_read Christoph Hellwig
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