97b6b9cbba
If profile-guided optimization is enabled, the purgatory ends up with
multiple .text sections. This is not supported by kexec and crashes the
system.
Link: https://lkml.kernel.org/r/20230321-kexec_clang16-v7-2-b05c520b7296@chromium.org
Fixes: 930457057a ("kernel/kexec_file.c: split up __kexec_load_puragory")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Cc: <stable@vger.kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Philipp Rudo <prudo@redhat.com>
Cc: Ross Zwisler <zwisler@google.com>
Cc: Simon Horman <horms@kernel.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Rix <trix@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
88 lines
2.7 KiB
Makefile
88 lines
2.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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OBJECT_FILES_NON_STANDARD := y
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purgatory-y := purgatory.o stack.o setup-x86_$(BITS).o sha256.o entry64.o string.o
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targets += $(purgatory-y)
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PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
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$(obj)/string.o: $(srctree)/arch/x86/boot/compressed/string.c FORCE
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$(call if_changed_rule,cc_o_c)
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$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
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$(call if_changed_rule,cc_o_c)
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CFLAGS_sha256.o := -D__DISABLE_EXPORTS
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# When profile-guided optimization is enabled, llvm emits two different
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# overlapping text sections, which is not supported by kexec. Remove profile
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# optimization flags.
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KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
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# When linking purgatory.ro with -r unresolved symbols are not checked,
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# also link a purgatory.chk binary without -r to check for unresolved symbols.
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PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
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LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
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LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
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targets += purgatory.ro purgatory.chk
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# Sanitizer, etc. runtimes are unavailable and cannot be linked here.
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GCOV_PROFILE := n
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KASAN_SANITIZE := n
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UBSAN_SANITIZE := n
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KCSAN_SANITIZE := n
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KMSAN_SANITIZE := n
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KCOV_INSTRUMENT := n
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# These are adjustments to the compiler flags used for objects that
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# make up the standalone purgatory.ro
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PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
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PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0
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PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
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PURGATORY_CFLAGS += -fno-stack-protector
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# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
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# in turn leaves some undefined symbols like __fentry__ in purgatory and not
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# sure how to relocate those.
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ifdef CONFIG_FUNCTION_TRACER
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PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE)
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endif
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ifdef CONFIG_STACKPROTECTOR
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PURGATORY_CFLAGS_REMOVE += -fstack-protector
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endif
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ifdef CONFIG_STACKPROTECTOR_STRONG
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PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong
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endif
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ifdef CONFIG_RETPOLINE
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PURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS)
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endif
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ifdef CONFIG_CFI_CLANG
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PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_CFI)
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endif
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CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE)
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CFLAGS_purgatory.o += $(PURGATORY_CFLAGS)
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CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE)
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CFLAGS_sha256.o += $(PURGATORY_CFLAGS)
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CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE)
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CFLAGS_string.o += $(PURGATORY_CFLAGS)
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asflags-remove-y += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
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$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
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$(call if_changed,ld)
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$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
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$(call if_changed,ld)
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$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
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obj-y += kexec-purgatory.o
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