c2a26769b4
commit 33cd65e73abd693c00c4156cf23677c453b41b3b upstream. During early boot, while KASAN is not yet initialized, it is possible to enter reporting code-path and end up in kasan_report(). While uninitialized, the branch there prevents generating any reports, however, under certain circumstances when branches are being traced (TRACE_BRANCH_PROFILING), we may recurse deep enough to cause kernel reboots without warning. To prevent similar issues in future, we should disable branch tracing for the core runtime. [elver@google.com: remove duplicate DISABLE_BRANCH_PROFILING, per Qian Cai] Link: https://lore.kernel.org/lkml/20200517011732.GE24705@shao2-debian/ Link: http://lkml.kernel.org/r/20200522075207.157349-1-elver@google.com Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Qian Cai <cai@lca.pw> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/r//20200517011732.GE24705@shao2-debian/ Link: http://lkml.kernel.org/r/20200519182459.87166-1-elver@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
25 lines
1.1 KiB
Makefile
25 lines
1.1 KiB
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 = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_generic.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_generic_report.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_tags.o = $(CC_FLAGS_FTRACE)
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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) -DDISABLE_BRANCH_PROFILING
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CFLAGS_generic.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) -DDISABLE_BRANCH_PROFILING
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CFLAGS_generic_report.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) -DDISABLE_BRANCH_PROFILING
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CFLAGS_tags.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) -DDISABLE_BRANCH_PROFILING
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obj-$(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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