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Fix GENERIC-KASAN kernel build for amd64

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Work around https://github.com/llvm/llvm-project/issues/87923, which
leads to an assertion failure compiling several kernel source files with
asan enabled.

PR:		276104
MFC after:	1 month

(cherry picked from commit b811dac211)
This commit is contained in:
Dimitry Andric 2024-04-07 19:56:03 +02:00
parent f0e05595a1
commit 924cf780a2
1 changed files with 5 additions and 0 deletions
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5
sys/conf/kern.pre.mk
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@ -111,6 +111,11 @@ SAN_CFLAGS+= -DSAN_NEEDS_INTERCEPTORS -DSAN_INTERCEPTOR_PREFIX=kasan \
# upstreamed similar to: https://reviews.llvm.org/D98285
#
SAN_CFLAGS+= -mllvm -asan-mapping-offset=0xdfff208000000000
.elif ${MACHINE_CPUARCH} == "amd64" && \
${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 180000
# Work around https://github.com/llvm/llvm-project/issues/87923, which leads to
# an assertion failure compiling dtrace.c with asan enabled.
SAN_CFLAGS+= -mllvm -asan-use-stack-safety=0
.endif
.endif