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Christophe Leroy 23274bd8d7 powerpc/8xx: Fix Oops with STRICT_KERNEL_RWX without DEBUG_RODATA_TEST [ Upstream commit `c12ab8dbc4` ] Until now, all tests involving CONFIG_STRICT_KERNEL_RWX were done with DEBUG_RODATA_TEST to check the result. But now that CONFIG_STRICT_KERNEL_RWX is selected by default, it came without CONFIG_DEBUG_RODATA_TEST and led to the following Oops [ 6.830908] Freeing unused kernel image (initmem) memory: 352K [ 6.840077] BUG: Unable to handle kernel data access on write at 0xc1285200 [ 6.846836] Faulting instruction address: 0xc0004b6c [ 6.851745] Oops: Kernel access of bad area, sig: 11 [#1] [ 6.857075] BE PAGE_SIZE=16K PREEMPT CMPC885 [ 6.861348] SAF3000 DIE NOTIFICATION [ 6.864830] CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0-rc5-s3k-dev-02255-g2747d7b7916f #451 [ 6.873429] NIP: c0004b6c LR: c0004b60 CTR: 00000000 [ 6.878419] REGS: c902be60 TRAP: 0300 Not tainted (5.15.0-rc5-s3k-dev-02255-g2747d7b7916f) [ 6.886852] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 53000335 XER: 8000ff40 [ 6.893564] DAR: c1285200 DSISR: 82000000 [ 6.893564] GPR00: 0c000000 c902bf20 c20f4000 08000000 00000001 04001f00 c1800000 00000035 [ 6.893564] GPR08: ff0001ff c1280000 00000002 c0004b60 00001000 00000000 c0004b1c 00000000 [ 6.893564] GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 6.893564] GPR24: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 c1060000 [ 6.932034] NIP [c0004b6c] kernel_init+0x50/0x138 [ 6.936682] LR [c0004b60] kernel_init+0x44/0x138 [ 6.941245] Call Trace: [ 6.943653] [c902bf20] [c0004b60] kernel_init+0x44/0x138 (unreliable) [ 6.950022] [c902bf30] [c001122c] ret_from_kernel_thread+0x5c/0x64 [ 6.956135] Instruction dump: [ 6.959060] 48ffc521 48045469 4800d8cd 3d20c086 89295fa0 2c090000 41820058 480796c9 [ 6.966890] 4800e48d 3d20c128 39400002 3fe0c106 <91495200> 3bff8000 4806fa1d 481f7d75 [ 6.974902] ---[ end trace 1e397bacba4aa610 ]--- 0xc1285200 corresponds to 'system_state' global var that the kernel is trying to set to SYSTEM_RUNNING. This var is above the RO/RW limit so it shouldn't Oops. It oopses because the dirty bit is missing. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/3d5800b0bbcd7b19761b98f50421358667b45331.1635520232.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-11-25 09:48:30 +01:00
arch	powerpc/8xx: Fix Oops with STRICT_KERNEL_RWX without DEBUG_RODATA_TEST	2021-11-25 09:48:30 +01:00
block	block: Hold invalidate_lock in BLKRESETZONE ioctl	2021-11-18 19:17:15 +01:00
certs	certs: Add support for using elliptic curve keys for signing modules	2021-08-23 19:55:42 +03:00
crypto	crypto: pcrypt - Delay write to padata->info	2021-11-18 19:16:44 +01:00
Documentation	fscrypt: allow 256-bit master keys with AES-256-XTS	2021-11-18 19:16:11 +01:00
drivers	iommu/dart: Initialize DART_STREAMS_ENABLE	2021-11-25 09:48:30 +01:00
fs	btrfs: zoned: allow preallocation for relocation inodes	2021-11-21 13:44:13 +01:00
include	scsi: target: Fix ordered tag handling	2021-11-25 09:48:29 +01:00
init	init: make unknown command line param message clearer	2021-11-18 19:17:11 +01:00
ipc	ipc: remove memcg accounting for sops objects in do_semtimedop()	2021-09-14 10:22:11 -07:00
kernel	perf/core: Avoid put_page() when GUP fails	2021-11-21 13:44:14 +01:00
lib	string: uninline memcpy_and_pad	2021-11-21 13:44:12 +01:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	mm, oom: do not trigger out_of_memory from the #PF	2021-11-18 19:17:16 +01:00
net	SUNRPC: Partial revert of commit `6f9f17287e`	2021-11-18 19:17:20 +01:00
samples	samples/kretprobes: Fix return value if register_kretprobe() failed	2021-11-18 19:16:42 +01:00
scripts	leaking_addresses: Always print a trailing newline	2021-11-18 19:16:16 +01:00
security	fortify: Explicitly disable Clang support	2021-11-21 13:44:13 +01:00
sound	ALSA: usb-audio: fix null pointer dereference on pointer cs_desc	2021-11-25 09:48:30 +01:00
tools	selftests/bpf: Fix also no-alu32 strobemeta selftest	2021-11-18 19:17:21 +01:00
usr	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
virt	KVM: Remove tlbs_dirty	2021-09-23 11:01:12 -04:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	drm fixes for 5.15 final	2021-10-28 12:17:01 -07:00
Makefile	Linux 5.15.4	2021-11-21 13:44:15 +01:00
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.