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From: "Theodore Ts'o" <tytso@mit.edu>
To: Matthew Wilcox <willy@infradead.org>
Cc: Hao Sun <sunhao.th@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk,
	Christoph Hellwig <hch@lst.de>, Kees Cook <keescook@chromium.org>
Subject: Re: WARNING in __kernel_read
Date: Wed, 6 Oct 2021 09:57:22 -0400	[thread overview]
Message-ID: <YV2rQnl1kJ84C1RV@mit.edu> (raw)
In-Reply-To: <YV2T3HVHHmQPHVYG@casper.infradead.org>

On Wed, Oct 06, 2021 at 01:17:32PM +0100, Matthew Wilcox wrote:
> finit_module() is not the only caller of kernel_read_file_from_fd()
> which passes it a fd that userspace passed in, for example
> kexec_file_load() doesn't validate the fd either.  We could validate
> the fd in individual syscalls, in kernel_read_file_from_fd()
> or just do what vfs_read() does and return -EBADF without warning.

My suggestion would be to do both, and keep a WARN() in
__kernel_read(), since that should never happen (and we want a stack
trace if it does).

						- Ted

  reply	other threads:[~2021-10-06 13:58 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-06  9:33 Hao Sun
2021-10-06 12:17 ` Matthew Wilcox
2021-10-06 13:57   ` Theodore Ts'o [this message]
2021-10-06 22:10     ` Kees Cook
2021-10-12  6:21   ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2020-07-13  7:03 syzbot
2020-07-14 11:02 ` Christoph Hellwig
2020-07-23 14:17   ` Cengiz Can
2020-07-23 15:51     ` Eric Biggers

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