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ubsan, kcsan: Don't combine sanitizer with kcov on clang

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Clang does not allow -fsanitize-coverage=trace-{pc,cmp} together
with -fsanitize=bounds or with ubsan:

  clang: error: argument unused during compilation: '-fsanitize-coverage=trace-pc' [-Werror,-Wunused-command-line-argument]
  clang: error: argument unused during compilation: '-fsanitize-coverage=trace-cmp' [-Werror,-Wunused-command-line-argument]

To avoid the warning, check whether clang can handle this correctly or
disallow ubsan and kcsan when kcov is enabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marco Elver <elver@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://bugs.llvm.org/show_bug.cgi?id=45831
Link: https://lore.kernel.org/lkml/20200505142341.1096942-1-arnd@arndb.de
Link: https://lkml.kernel.org/r/20200521142047.169334-2-elver@google.com
This commit is contained in:
Arnd Bergmann 2020-05-21 16:20:37 +02:00 committed by Thomas Gleixner
parent 37d1a04b13
commit ea91a1d45d
2 changed files with 22 additions and 0 deletions
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11
lib/Kconfig.kcsan
View File

@ -3,9 +3,20 @@
config HAVE_ARCH_KCSAN
bool
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 && DEBUG_KERNEL && !KASAN
depends on !KCSAN_KCOV_BROKEN
select STACKTRACE
help
The Kernel Concurrency Sanitizer (KCSAN) is a dynamic

11
lib/Kconfig.ubsan
View File

@ -26,9 +26,20 @@ 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 UBSAN_BOUNDS
bool "Perform array index bounds checking"
default UBSAN
depends on !UBSAN_KCOV_BROKEN
help
This option enables detection of directly indexed out of bounds
array accesses, where the array size is known at compile time.