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Jens Axboe fd2206e4e9 io_uring: disallow close of ring itself
A previous commit enabled this functionality, which also enabled O_PATH
to work correctly with io_uring. But we can't safely close the ring
itself, as the file handle isn't reference counted inside
io_uring_enter(). Instead of jumping through hoops to enable ring
closure, add a "soft" ->needs_file option, ->needs_file_no_error. This
enables O_PATH file descriptors to work, but still catches the case of
trying to close the ring itself.

Reported-by: Jann Horn <jannh@google.com>
Fixes: 904fbcb115 ("io_uring: remove 'fd is io_uring' from close path")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-06-02 17:22:24 -06:00
arch for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
block for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
certs
crypto
Documentation for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
drivers for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
fs io_uring: disallow close of ring itself 2020-06-02 17:22:24 -06:00
include for-5.8/io_uring-2020-06-01 2020-06-02 15:42:50 -07:00
init
ipc
kernel for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
lib hmm related patches for 5.8 2020-06-02 14:05:27 -07:00
LICENSES
mm for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
net
samples
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sound Merge branch 'akpm' (patches from Andrew) 2020-06-02 12:21:36 -07:00
tools for-5.8/block-2020-06-01 2020-06-02 15:29:19 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
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MAINTAINERS for-5.8/drivers-2020-06-01 2020-06-02 15:37:03 -07:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.