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Kees Cook 0d24ae0f10 hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO
commit f02003c860 upstream.

Currently under Clang, CC_HAS_AUTO_VAR_INIT_ZERO requires an extra
-enable flag compared to CC_HAS_AUTO_VAR_INIT_PATTERN. GCC 12[1] will
not, and will happily ignore the Clang-specific flag. However, its
presence on the command-line is both cumbersome and confusing. Due to
GCC's tolerant behavior, though, we can continue to use a single Kconfig
cc-option test for the feature on both compilers, but then drop the
Clang-specific option in the Makefile.

In other words, this patch does not change anything other than making the
compiler command line shorter once GCC supports -ftrivial-auto-var-init=zero.

[1] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=a25e0b5e6ac8a77a71c229e0a7b744603365b0e9

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: llvm@lists.linux.dev
Fixes: dcb7c0b946 ("hardening: Clarify Kconfig text for auto-var-init")
Suggested-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/lkml/20210914102837.6172-1-will@kernel.org/
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-04-19 17:54:25 +08:00
arch powerpc/boot: Explicitly disable usage of SPE instructions 2023-04-19 17:54:23 +08:00
block block: blk_queue_enter() / __bio_queue_enter() must return -EAGAIN for nowait 2023-04-19 17:53:54 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto KEYS: asymmetric: enforce SM2 signature use pkey algo 2023-04-19 17:52:55 +08:00
Documentation fs: record I_DIRTY_TIME even if inode already has I_DIRTY_INODE 2023-04-19 17:54:24 +08:00
drivers fbdev: smscufx: Fix use-after-free in ufx_ops_open() 2023-04-19 17:54:24 +08:00
fs f2fs: fix to do sanity check on summary info 2023-04-19 17:54:25 +08:00
include fs: record I_DIRTY_TIME even if inode already has I_DIRTY_INODE 2023-04-19 17:54:24 +08:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2023-04-19 17:52:12 +08:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2023-04-19 17:49:52 +08:00
kernel swiotlb: max mapping size takes min align mask into account 2023-04-19 17:54:10 +08:00
lib crypto: lib - remove unneeded selection of XOR_BLOCKS 2023-04-19 17:53:28 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/mmap: undo ->mmap() when arch_validate_flags() fails 2023-04-19 17:54:23 +08:00
net wifi: mac80211: fix MBSSID parsing use-after-free 2023-04-19 17:54:18 +08:00
samples samples/landlock: Format with clang-format 2023-04-19 17:50:01 +08:00
scripts Makefile.extrawarn: Move -Wcast-function-type-strict to W=1 2023-04-19 17:54:13 +08:00
security hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO 2023-04-19 17:54:25 +08:00
sound ASoC: wcd934x: fix order of Slimbus unprepare/disable 2023-04-19 17:54:21 +08:00
tools perf parse-events: Identify broken modifiers 2023-04-19 17:54:15 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt KVM: SEV: add cache flush to solve SEV cache incoherency issues 2023-04-19 17:53:56 +08:00
.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 Input: goodix - add a goodix.h header file 2023-04-19 17:50:59 +08:00
Makefile hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO 2023-04-19 17:54:25 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.