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Hans de Goede f680da6339 iommu/vt-d: dmar: replace WARN_TAINT with pr_warn + add_taint 
commit 5983369644 upstream.

Quoting from the comment describing the WARN functions in
include/asm-generic/bug.h:

 * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
 * significant kernel issues that need prompt attention if they should ever
 * appear at runtime.
 *
 * Do not use these macros when checking for invalid external inputs

The (buggy) firmware tables which the dmar code was calling WARN_TAINT
for really are invalid external inputs. They are not under the kernel's
control and the issues in them cannot be fixed by a kernel update.
So logging a backtrace, which invites bug reports to be filed about this,
is not helpful.

Some distros, e.g. Fedora, have tools watching for the kernel backtraces
logged by the WARN macros and offer the user an option to file a bug for
this when these are encountered. The WARN_TAINT in warn_invalid_dmar()
+ another iommu WARN_TAINT, addressed in another patch, have lead to over
a 100 bugs being filed this way.

This commit replaces the WARN_TAINT("...") calls, with
pr_warn(FW_BUG "...") + add_taint(TAINT_FIRMWARE_WORKAROUND, ...) calls
avoiding the backtrace and thus also avoiding bug-reports being filed
about this against the kernel.

Fixes: fd0c889489 ("intel-iommu: Set a more specific taint flag for invalid BIOS DMAR tables")
Fixes: e625b4a95d ("iommu/vt-d: Parse ANDD records")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200309140138.3753-2-hdegoede@redhat.com
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1564895
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-03-20 10:54:18 +01:00
arch x86/mce: Fix logic and comments around MSR_PPIN_CTL 2020-03-20 10:54:17 +01:00
block block: don't use bio->bi_vcnt to figure out segment number 2020-01-27 14:46:19 +01:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: api - Fix race condition in crypto_spawn_alg 2020-02-14 16:32:14 -05:00
Documentation cifs_atomic_open(): fix double-put on late allocation failure 2020-03-20 10:54:16 +01:00
drivers iommu/vt-d: dmar: replace WARN_TAINT with pr_warn + add_taint 2020-03-20 10:54:18 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs gfs2_atomic_open(): fix O_EXCL|O_CREAT handling on cold dcache 2020-03-20 10:54:16 +01:00
include cgroup: Iterate tasks that did not finish do_exit() 2020-03-20 10:54:14 +01:00
init fork: fix some -Wmissing-prototypes warnings 2019-12-05 15:37:52 +01:00
ipc Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()" 2020-02-28 16:36:12 +01:00
kernel workqueue: don't use wq_select_unbound_cpu() for bound works 2020-03-20 10:54:16 +01:00
lib lib/stackdepot.c: fix global out-of-bounds in stack_slabs 2020-02-28 16:36:13 +01:00
mm net: memcg: late association of sock to memcg 2020-03-20 10:54:09 +01:00
net inet_diag: return classid for all socket types 2020-03-20 10:54:13 +01:00
samples samples/bpf: Don't try to remove user's homedir on clean 2020-02-14 16:32:13 -05:00
scripts kconfig: fix broken dependency in randconfig-generated .config 2020-02-28 16:35:59 +01:00
security selinux: ensure we cleanup the internal AVC counters on error in avc_update() 2020-02-28 16:36:09 +01:00
sound ASoC: topology: Fix memleak in soc_tplg_manifest_load() 2020-03-11 18:03:09 +01:00
tools ktest: Add timeout for ssh sync testing 2020-03-20 10:54:16 +01:00
usr kbuild: clean compressed initramfs image 2019-10-07 18:55:14 +02:00
virt KVM: Check for a bad hva before dropping into the ghc slow path 2020-03-11 18:02:53 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.173 2020-03-11 18:03:09 +01:00
README

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.