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Lukas Wunner 0d8dc8993a cxl/pci: Handle truncated CDAT entries 
commit b56faef231 upstream.

If truncated CDAT entries are received from a device, the concatenation
of those entries constitutes a corrupt CDAT, yet is happily exposed to
user space.

Avoid by verifying response lengths and erroring out if truncation is
detected.

The last CDAT entry may still be truncated despite the checks introduced
herein if the length in the CDAT header is too small.  However, that is
easily detectable by user space because it reaches EOF prematurely.
A subsequent commit which rightsizes the CDAT response allocation closes
that remaining loophole.

The two lines introduced here which exceed 80 chars are shortened to
less than 80 chars by a subsequent commit which migrates to a
synchronous DOE API and replaces "t.task.rv" by "rc".

The existing acpi_cdat_header and acpi_table_cdat struct definitions
provided by ACPICA cannot be used because they do not employ __le16 or
__le32 types.  I believe that cannot be changed because those types are
Linux-specific and ACPI is specified for little endian platforms only,
hence doesn't care about endianness.  So duplicate the structs.

Fixes: c97006046c ("cxl/port: Read CDAT table")
Tested-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: stable@vger.kernel.org # v6.0+
Link: https://lore.kernel.org/r/bce3aebc0e8e18a1173425a7a865b232c3912963.1678543498.git.lukas@wunner.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-04-13 16:55:25 +02:00
arch arm64: compat: Work around uninitialized variable warning 2023-04-13 16:55:24 +02:00
block block: do not reverse request order when flushing plug list 2023-03-22 13:33:46 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: rsa-pkcs1pad - Use akcipher_request_complete 2023-03-10 09:33:03 +01:00
Documentation dt-bindings: mtd: jedec,spi-nor: Document CPOL/CPHA support 2023-04-06 12:10:55 +02:00
drivers cxl/pci: Handle truncated CDAT entries 2023-04-13 16:55:25 +02:00
fs NFSD: callback request does not use correct credential for AUTH_SYS 2023-04-13 16:55:23 +02:00
include cxl/pci: Fix CDAT retrieval on big endian 2023-04-13 16:55:24 +02:00
init gcc: disable -Warray-bounds for gcc-11 too 2023-01-14 10:33:43 +01:00
io_uring io_uring: fix poll/netmsg alloc caches 2023-04-06 12:10:52 +02:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel tracing: Fix wrong return in kprobe_event_gen_test.c 2023-04-06 12:10:41 +02:00
lib zstd: Fix definition of assert() 2023-04-06 12:10:38 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/ksm: fix race with VMA iteration and mm_struct teardown 2023-03-30 12:49:29 +02:00
net netlink: annotate lockless accesses to nlk->max_recvmsg_len 2023-04-13 16:55:24 +02:00
rust rust: print: avoid evaluating arguments in pr_* macros in unsafe blocks 2023-02-06 08:06:34 +01:00
samples ftrace: Export ftrace_free_filter() to modules 2023-02-01 08:34:37 +01:00
scripts modpost: Fix processing of CRCs on 32-bit build machines 2023-04-06 12:10:53 +02:00
security keys: Do not cache key in task struct if key is requested from kernel thread 2023-03-30 12:49:07 +02:00
sound ALSA: hda/hdmi: Preserve the previous PCM device upon re-enablement 2023-04-13 16:55:21 +02:00
tools libbpf: Fix btf_dump's packed struct determination 2023-04-06 12:10:58 +02:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Register /dev/kvm as the _very_ last thing during initialization 2023-03-10 09:34:11 +01:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS audit: update the mailing list in MAINTAINERS 2023-02-25 11:25:42 +01:00
Makefile Linux 6.1.23 2023-04-06 12:10:58 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.