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A mirror of the official Linux kernel repository just in case
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KP Singh 6921ed9049 x86/speculation: Allow enabling STIBP with legacy IBRS 
When plain IBRS is enabled (not enhanced IBRS), the logic in
spectre_v2_user_select_mitigation() determines that STIBP is not needed.

The IBRS bit implicitly protects against cross-thread branch target
injection. However, with legacy IBRS, the IBRS bit is cleared on
returning to userspace for performance reasons which leaves userspace
threads vulnerable to cross-thread branch target injection against which
STIBP protects.

Exclude IBRS from the spectre_v2_in_ibrs_mode() check to allow for
enabling STIBP (through seccomp/prctl() by default or always-on, if
selected by spectre_v2_user kernel cmdline parameter).

  [ bp: Massage. ]

Fixes: 7c693f54c8 ("x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS")
Reported-by: José Oliveira <joseloliveira11@gmail.com>
Reported-by: Rodrigo Branco <rodrigo@kernelhacking.com>
Signed-off-by: KP Singh <kpsingh@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230220120127.1975241-1-kpsingh@kernel.org
Link: https://lore.kernel.org/r/20230221184908.2349578-1-kpsingh@kernel.org
2023-02-27 18:57:09 +01:00
arch x86/speculation: Allow enabling STIBP with legacy IBRS 2023-02-27 18:57:09 +01:00
block Updates for the interrupt subsystem: 2023-02-21 10:03:48 -08:00
certs certs: don't try to update blacklist keys 2023-02-13 10:11:20 +02:00
crypto KEYS: asymmetric: Fix ECDSA use via keyctl uapi 2023-02-13 10:11:20 +02:00
Documentation - Cache the AMD debug registers in per-CPU variables to avoid MSR writes 2023-02-21 14:51:40 -08:00
drivers Thermal control updates for 6.3-rc1 2023-02-21 12:32:05 -08:00
fs hardening updates for v6.3-rc1 2023-02-21 11:07:23 -08:00
include uaccess: Add speculation barrier to copy_from_user() 2023-02-21 14:45:22 -08:00
init RCU pull request for v6.3 2023-02-21 10:45:51 -08:00
io_uring for-6.3/block-2023-02-16 2023-02-20 14:27:21 -08:00
ipc fs: port ->permission() to pass mnt_idmap 2023-01-19 09:24:28 +01:00
kernel uaccess: Add speculation barrier to copy_from_user() 2023-02-21 14:45:22 -08:00
lib uaccess: Add speculation barrier to copy_from_user() 2023-02-21 14:45:22 -08:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm Scheduler updates in this cycle are: 2023-02-20 17:41:08 -08:00
net hardening updates for v6.3-rc1 2023-02-21 11:07:23 -08:00
rust Rust changes for v6.3 2023-02-20 10:40:42 -08:00
samples ftrace: Export ftrace_free_filter() to modules 2023-01-24 11:20:58 -05:00
scripts hardening updates for v6.3-rc1 2023-02-21 11:07:23 -08:00
security hardening updates for v6.3-rc1 2023-02-21 11:07:23 -08:00
sound ARM: unused boardfile removal for 6.3 2023-02-20 15:28:57 -08:00
tools - Cache the AMD debug registers in per-CPU variables to avoid MSR writes 2023-02-21 14:51:40 -08:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt VFIO fixes for v6.2-rc6 2023-01-23 11:56:07 -08:00
.clang-format iommufd for 6.2 2022-12-14 09:15:43 -08:00
.cocciconfig
.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 .gitignore: ignore *.rpm 2022-12-30 17:22:14 +09:00
.mailmap 12 hotfixes, mostly against mm/. Five of these fixes are cc:stable. 2023-02-13 14:09:20 -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: update SCTP maintainers 2023-02-02 11:35:33 -08:00
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 Thermal control updates for 6.3-rc1 2023-02-21 12:32:05 -08:00
Makefile Rust changes for v6.3 2023-02-20 10:40:42 -08:00
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.