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KASAN inserts extra code for every LOAD/STORE emitted by te compiler.
Much of this code is simple and safe to run with AC=1, however the
kasan_report() function, called on error, is most certainly not safe
to call with AC=1.
Therefore wrap kasan_report() in user_access_{save,restore}; which for
x86 SMAP, saves/restores EFLAGS and clears AC before calling the real
function.
Also ensure all the functions are without __fentry__ hook. The
function tracer is also not safe.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
25 lines
954 B
Makefile
25 lines
954 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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KASAN_SANITIZE := n
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UBSAN_SANITIZE_common.o := n
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UBSAN_SANITIZE_generic.o := n
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UBSAN_SANITIZE_generic_report.o := n
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UBSAN_SANITIZE_tags.o := n
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KCOV_INSTRUMENT := n
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CFLAGS_REMOVE_common.o = -pg
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CFLAGS_REMOVE_generic.o = -pg
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CFLAGS_REMOVE_generic_report.o = -pg
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CFLAGS_REMOVE_tags.o = -pg
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# Function splitter causes unnecessary splits in __asan_load1/__asan_store1
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# see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63533
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CFLAGS_common.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
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CFLAGS_generic.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
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CFLAGS_generic_report.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
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CFLAGS_tags.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
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obj-$(CONFIG_KASAN) := common.o init.o report.o
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obj-$(CONFIG_KASAN_GENERIC) += generic.o generic_report.o quarantine.o
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obj-$(CONFIG_KASAN_SW_TAGS) += tags.o tags_report.o
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