The patch titled
Subject: Revert "ubsan, kcsan: Don't combine sanitizer with kcov on clang"
has been added to the -mm tree. Its filename is
revert-ubsan-kcsan-dont-combine-sanitizer-with-kcov-on-clang.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/revert-ubsan-kcsan-dont-combine-sanitizer-with-kcov-on-clang.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/revert-ubsan-kcsan-dont-combine-sanitizer-with-kcov-on-clang.patch
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------------------------------------------------------
From: Marco Elver <elver@xxxxxxxxxx>
Subject: Revert "ubsan, kcsan: Don't combine sanitizer with kcov on clang"
This reverts commit ea91a1d45d19469001a4955583187b0d75915759.
Since df05c0e9496c ("Documentation: Raise the minimum supported version
of LLVM to 11.0.0") the minimum Clang version is now 11.0, which fixed
the UBSAN/KCSAN vs. KCOV incompatibilities.
Link: https://bugs.llvm.org/show_bug.cgi?id=45831
Link: https://lkml.kernel.org/r/YaodyZzu0MTCJcvO@xxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20220128105631.509772-1-elver@xxxxxxxxxx
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.kcsan | 11 -----------
lib/Kconfig.ubsan | 12 ------------
2 files changed, 23 deletions(-)
--- a/lib/Kconfig.kcsan~revert-ubsan-kcsan-dont-combine-sanitizer-with-kcov-on-clang
+++ a/lib/Kconfig.kcsan
@@ -10,21 +10,10 @@ config HAVE_KCSAN_COMPILER
For the list of compilers that support KCSAN, please see
<file:Documentation/dev-tools/kcsan.rst>.
-config KCSAN_KCOV_BROKEN
- def_bool KCOV && CC_HAS_SANCOV_TRACE_PC
- depends on CC_IS_CLANG
- depends on !$(cc-option,-Werror=unused-command-line-argument -fsanitize=thread -fsanitize-coverage=trace-pc)
- help
- Some versions of clang support either KCSAN and KCOV but not the
- combination of the two.
- See https://bugs.llvm.org/show_bug.cgi?id=45831 for the status
- in newer releases.
-
menuconfig KCSAN
bool "KCSAN: dynamic data race detector"
depends on HAVE_ARCH_KCSAN && HAVE_KCSAN_COMPILER
depends on DEBUG_KERNEL && !KASAN
- depends on !KCSAN_KCOV_BROKEN
select STACKTRACE
help
The Kernel Concurrency Sanitizer (KCSAN) is a dynamic
--- a/lib/Kconfig.ubsan~revert-ubsan-kcsan-dont-combine-sanitizer-with-kcov-on-clang
+++ a/lib/Kconfig.ubsan
@@ -27,16 +27,6 @@ config UBSAN_TRAP
the system. For some system builders this is an acceptable
trade-off.
-config UBSAN_KCOV_BROKEN
- def_bool KCOV && CC_HAS_SANCOV_TRACE_PC
- depends on CC_IS_CLANG
- depends on !$(cc-option,-Werror=unused-command-line-argument -fsanitize=bounds -fsanitize-coverage=trace-pc)
- help
- Some versions of clang support either UBSAN or KCOV but not the
- combination of the two.
- See https://bugs.llvm.org/show_bug.cgi?id=45831 for the status
- in newer releases.
-
config CC_HAS_UBSAN_BOUNDS
def_bool $(cc-option,-fsanitize=bounds)
@@ -46,7 +36,6 @@ config CC_HAS_UBSAN_ARRAY_BOUNDS
config UBSAN_BOUNDS
bool "Perform array index bounds checking"
default UBSAN
- depends on !UBSAN_KCOV_BROKEN
depends on CC_HAS_UBSAN_ARRAY_BOUNDS || CC_HAS_UBSAN_BOUNDS
help
This option enables detection of directly indexed out of bounds
@@ -72,7 +61,6 @@ config UBSAN_ARRAY_BOUNDS
config UBSAN_LOCAL_BOUNDS
bool "Perform array local bounds checking"
depends on UBSAN_TRAP
- depends on !UBSAN_KCOV_BROKEN
depends on $(cc-option,-fsanitize=local-bounds)
help
This option enables -fsanitize=local-bounds which traps when an
_
Patches currently in -mm which might be from elver@xxxxxxxxxx are
revert-ubsan-kcsan-dont-combine-sanitizer-with-kcov-on-clang.patch
