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Mark Rutland 6c65884f58 arm64: kpti: ensure patched kernel text is fetched from PoU 
[ Upstream commit f32c7a8e45 ]

While the MMUs is disabled, I-cache speculation can result in
instructions being fetched from the PoC. During boot we may patch
instructions (e.g. for alternatives and jump labels), and these may be
dirty at the PoU (and stale at the PoC).

Thus, while the MMU is disabled in the KPTI pagetable fixup code we may
load stale instructions into the I-cache, potentially leading to
subsequent crashes when executing regions of code which have been
modified at runtime.

Similarly to commit:

  8ec4198743 ("arm64: mm: ensure patched kernel text is fetched from PoU")

... we can invalidate the I-cache after enabling the MMU to prevent such
issues.

The KPTI pagetable fixup code itself should be clean to the PoC per the
boot protocol, so no maintenance is required for this code.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-10-05 12:47:57 +02:00
arch arm64: kpti: ensure patched kernel text is fetched from PoU 2019-10-05 12:47:57 +02:00
block blk-mq: move cancel of requeue_work to the front of blk_exit_queue 2019-10-05 12:47:37 +02:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: chacha20poly1305 - fix atomic sleep when using async algorithm 2019-07-31 07:28:35 +02:00
Documentation x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h 2019-08-29 08:26:43 +02:00
drivers ACPI / CPPC: do not require the _PSD method 2019-10-05 12:47:57 +02:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs f2fs: use generic EFSBADCRC/EFSCORRUPTED 2019-10-05 12:47:39 +02:00
include IB/core: Add an unbound WQ type to the new CQ API 2019-10-05 12:47:32 +02:00
init init: initialize jump labels before command line option parsing 2019-05-16 19:42:23 +02:00
ipc ipc/mqueue.c: only perform resource calculation if user valid 2019-08-06 19:05:24 +02:00
kernel sched/fair: Use rq_lock/unlock in online_fair_sched_group 2019-10-05 12:47:50 +02:00
lib test_firmware: fix a memory leak bug 2019-08-16 10:13:55 +02:00
mm mm/zsmalloc.c: fix build when CONFIG_COMPACTION=n 2019-09-06 10:20:51 +02:00
net nfc: enforce CAP_NET_RAW for raw sockets 2019-10-05 12:47:44 +02:00
samples samples, bpf: fix to change the buffer size for read() 2019-07-21 09:04:17 +02:00
scripts scripts/decode_stacktrace: match basepath using shell prefix operator, not regex 2019-09-16 08:20:46 +02:00
security keys: Fix missing null pointer check in request_key_auth_describe() 2019-09-21 07:15:45 +02:00
sound ASoC: es8316: fix headphone mixer volume table 2019-10-05 12:47:57 +02:00
tools perf trace beauty ioctl: Fix off-by-one error in cmd->string table 2019-10-05 12:47:56 +02:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: coalesced_mmio: add bounds checking 2019-09-21 07:15:28 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.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: Add Sasha as a stable branch maintainer 2018-12-01 09:42:50 +01:00
Makefile objtool: Query pkg-config for libelf location 2019-10-05 12:47:32 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

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.