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linux/scripts/gcc-plugins
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Andrey Ryabinin 7771bdbbfd kasan: remove use after scope bugs detection. 
Use after scope bugs detector seems to be almost entirely useless for
the linux kernel.  It exists over two years, but I've seen only one
valid bug so far [1].  And the bug was fixed before it has been
reported.  There were some other use-after-scope reports, but they were
false-positives due to different reasons like incompatibility with
structleak plugin.

This feature significantly increases stack usage, especially with GCC <
9 version, and causes a 32K stack overflow.  It probably adds
performance penalty too.

Given all that, let's remove use-after-scope detector entirely.

While preparing this patch I've noticed that we mistakenly enable
use-after-scope detection for clang compiler regardless of
CONFIG_KASAN_EXTRA setting.  This is also fixed now.

[1] http://lkml.kernel.org/r/<20171129052106.rhgbjhhis53hkgfn@wfg-t540p.sh.intel.com>

Link: http://lkml.kernel.org/r/20190111185842.13978-1-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Will Deacon <will.deacon@arm.com>		[arm64]
Cc: Qian Cai <cai@lca.pw>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-03-05 21:07:13 -08:00
..
.gitignore gcc-plugins: Add the randstruct plugin 2017-06-22 16:15:45 -07:00
arm_ssp_per_task_plugin.c gcc-plugins: arm_ssp_per_task_plugin: fix for GCC 9+ 2019-01-20 14:06:40 -08:00
cyc_complexity_plugin.c gcc-plugins: consolidate on PASS_INFO macro 2017-01-13 14:20:03 -08:00
gcc-common.h gcc-plugins: Clean up the cgraph_create_edge* macros 2018-07-24 16:14:06 -07:00
gcc-generate-gimple-pass.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gcc-generate-ipa-pass.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gcc-generate-rtl-pass.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gcc-generate-simple_ipa-pass.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gen-random-seed.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig kasan: remove use after scope bugs detection. 2019-03-05 21:07:13 -08:00
latent_entropy_plugin.c gcc-plugins: Use dynamic initializers 2018-02-05 17:27:46 -08:00
Makefile gcc-plugins: remove unused GCC_PLUGIN_SUBDIR 2018-07-02 19:27:00 -07:00
randomize_layout_plugin.c security: convert security hooks to use hlist 2018-03-31 13:18:27 +11:00
sancov_plugin.c gcc-plugins: fix sancov_plugin for gcc-5 2017-02-27 14:10:10 -08:00
stackleak_plugin.c stackleak: Register the 'stackleak_cleanup' pass before the '*free_cfg' pass 2018-12-06 09:10:23 -08:00
structleak_plugin.c gcc-plugins: Use dynamic initializers 2018-02-05 17:27:46 -08:00