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Daniel Thompson 739c2f07b2 kdb: Fix the putarea helper function 
[ Upstream commit c1cb81429d ]

Currently kdb_putarea_size() uses copy_from_kernel_nofault() to write *to*
arbitrary kernel memory. This is obviously wrong and means the memory
modify ('mm') command is a serious risk to debugger stability: if we poke
to a bad address we'll double-fault and lose our debug session.

Fix this the (very) obvious way.

Note that there are two Fixes: tags because the API was renamed and this
patch will only trivially backport as far as the rename (and this is
probably enough). Nevertheless Christoph's rename did not introduce this
problem so I wanted to record that!

Fixes: fe557319aa ("maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault")
Fixes: 5d5314d679 ("kdb: core for kgdb back end (1 of 2)")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20220128144055.207267-1-daniel.thompson@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-08 13:58:32 +02:00
arch powerpc/pseries: Fix use after free in remove_phb_dynamic() 2022-04-08 13:58:21 +02:00
block block: don't delete queue kobject before its children 2022-04-08 13:57:35 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-08 13:57:32 +02:00
Documentation cxl/core/port: Rename bus.c to port.c 2022-04-08 13:58:07 +02:00
drivers driver core: dd: fix return value of __setup handler 2022-04-08 13:58:30 +02:00
fs NFSv4.1: don't retry BIND_CONN_TO_SESSION on session error 2022-04-08 13:58:31 +02:00
include netfilter: egress: Report interface as outgoing 2022-04-08 13:58:31 +02:00
init lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel kdb: Fix the putarea helper function 2022-04-08 13:58:32 +02:00
lib vsprintf: Fix %pK with kptr_restrict == 0 2022-04-08 13:57:49 +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/kmemleak: reset tag when compare object pointer 2022-04-08 13:57:23 +02:00
net SUNRPC don't resend a task on an offlined transport 2022-04-08 13:58:31 +02:00
samples samples/bpf, xdpsock: Fix race when running for fix duration of time 2022-04-08 13:58:18 +02:00
scripts scripts/dtc: Call pkg-config POSIXly correct 2022-04-08 13:58:03 +02:00
security TOMOYO: fix __setup handlers return values 2022-04-08 13:58:12 +02:00
sound ASoC: amd: Fix reference to PCM buffer address 2022-04-08 13:57:54 +02:00
tools perf parse-events: Move slots only with topdown 2022-04-08 13:58:31 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Fix lockdep false negative during host resume 2022-02-17 09:52:50 -05:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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 MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
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 net: dsa: realtek-smi: move to subdirectory 2022-04-08 13:58:12 +02:00
Makefile Linux 5.17.1 2022-03-28 10:03:22 +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.