mirror of
https://github.com/hardkernel/linux.git
synced 2026-03-31 10:13:04 +09:00
commit d0a8d9378d upstream.
native_save_fl() is marked static inline, but by using it as
a function pointer in arch/x86/kernel/paravirt.c, it MUST be outlined.
paravirt's use of native_save_fl() also requires that no GPRs other than
%rax are clobbered.
Compilers have different heuristics which they use to emit stack guard
code, the emittance of which can break paravirt's callee saved assumption
by clobbering %rcx.
Marking a function definition extern inline means that if this version
cannot be inlined, then the out-of-line version will be preferred. By
having the out-of-line version be implemented in assembly, it cannot be
instrumented with a stack protector, which might violate custom calling
conventions that code like paravirt rely on.
The semantics of extern inline has changed since gnu89. This means that
folks using GCC versions >= 5.1 may see symbol redefinition errors at
link time for subdirs that override KBUILD_CFLAGS (making the C standard
used implicit) regardless of this patch. This has been cleaned up
earlier in the patch set, but is left as a note in the commit message
for future travelers.
Reports:
https://lkml.org/lkml/2018/5/7/534
https://github.com/ClangBuiltLinux/linux/issues/16
Discussion:
https://bugs.llvm.org/show_bug.cgi?id=37512
https://lkml.org/lkml/2018/5/24/1371
Thanks to the many folks that participated in the discussion.
Debugged-by: Alistair Strachan <astrachan@google.com>
Debugged-by: Matthias Kaehlcke <mka@chromium.org>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: H. Peter Anvin <hpa@zytor.com>
Suggested-by: Tom Stellar <tstellar@redhat.com>
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@redhat.com
Cc: akataria@vmware.com
Cc: akpm@linux-foundation.org
Cc: andrea.parri@amarulasolutions.com
Cc: ard.biesheuvel@linaro.org
Cc: aryabinin@virtuozzo.com
Cc: astrachan@google.com
Cc: boris.ostrovsky@oracle.com
Cc: brijesh.singh@amd.com
Cc: caoj.fnst@cn.fujitsu.com
Cc: geert@linux-m68k.org
Cc: ghackmann@google.com
Cc: gregkh@linuxfoundation.org
Cc: jan.kiszka@siemens.com
Cc: jarkko.sakkinen@linux.intel.com
Cc: joe@perches.com
Cc: jpoimboe@redhat.com
Cc: keescook@google.com
Cc: kirill.shutemov@linux.intel.com
Cc: kstewart@linuxfoundation.org
Cc: linux-efi@vger.kernel.org
Cc: linux-kbuild@vger.kernel.org
Cc: manojgupta@google.com
Cc: mawilcox@microsoft.com
Cc: michal.lkml@markovi.net
Cc: mjg59@google.com
Cc: mka@chromium.org
Cc: pombredanne@nexb.com
Cc: rientjes@google.com
Cc: rostedt@goodmis.org
Cc: thomas.lendacky@amd.com
Cc: tweek@google.com
Cc: virtualization@lists.linux-foundation.org
Cc: will.deacon@arm.com
Cc: yamada.masahiro@socionext.com
Link: http://lkml.kernel.org/r/20180621162324.36656-4-ndesaulniers@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
146 lines
4.5 KiB
Makefile
146 lines
4.5 KiB
Makefile
#
|
|
# Makefile for the linux kernel.
|
|
#
|
|
|
|
extra-y := head_$(BITS).o
|
|
extra-y += head$(BITS).o
|
|
extra-y += ebda.o
|
|
extra-y += platform-quirks.o
|
|
extra-y += vmlinux.lds
|
|
|
|
CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE)
|
|
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
# Do not profile debug and lowlevel utilities
|
|
CFLAGS_REMOVE_tsc.o = -pg
|
|
CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
|
|
CFLAGS_REMOVE_pvclock.o = -pg
|
|
CFLAGS_REMOVE_kvmclock.o = -pg
|
|
CFLAGS_REMOVE_ftrace.o = -pg
|
|
CFLAGS_REMOVE_early_printk.o = -pg
|
|
endif
|
|
|
|
KASAN_SANITIZE_head$(BITS).o := n
|
|
KASAN_SANITIZE_dumpstack.o := n
|
|
KASAN_SANITIZE_dumpstack_$(BITS).o := n
|
|
KASAN_SANITIZE_stacktrace.o := n
|
|
|
|
OBJECT_FILES_NON_STANDARD_head_$(BITS).o := y
|
|
OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y
|
|
OBJECT_FILES_NON_STANDARD_mcount_$(BITS).o := y
|
|
OBJECT_FILES_NON_STANDARD_test_nx.o := y
|
|
OBJECT_FILES_NON_STANDARD_paravirt_patch_$(BITS).o := y
|
|
|
|
# If instrumentation of this dir is enabled, boot hangs during first second.
|
|
# Probably could be more selective here, but note that files related to irqs,
|
|
# boot, dumpstack/stacktrace, etc are either non-interesting or can lead to
|
|
# non-deterministic coverage.
|
|
KCOV_INSTRUMENT := n
|
|
|
|
CFLAGS_irq.o := -I$(src)/../include/asm/trace
|
|
|
|
obj-y := process_$(BITS).o signal.o
|
|
obj-$(CONFIG_COMPAT) += signal_compat.o
|
|
obj-y += traps.o irq.o irq_$(BITS).o dumpstack_$(BITS).o
|
|
obj-y += time.o ioport.o dumpstack.o nmi.o
|
|
obj-$(CONFIG_MODIFY_LDT_SYSCALL) += ldt.o
|
|
obj-y += setup.o x86_init.o i8259.o irqinit.o jump_label.o
|
|
obj-$(CONFIG_IRQ_WORK) += irq_work.o
|
|
obj-y += probe_roms.o
|
|
obj-$(CONFIG_X86_64) += sys_x86_64.o mcount_64.o
|
|
obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
|
|
obj-$(CONFIG_SYSFS) += ksysfs.o
|
|
obj-y += bootflag.o e820.o
|
|
obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
|
|
obj-y += alternative.o i8253.o pci-nommu.o hw_breakpoint.o
|
|
obj-y += tsc.o tsc_msr.o io_delay.o rtc.o
|
|
obj-y += pci-iommu_table.o
|
|
obj-y += resource.o
|
|
obj-y += irqflags.o
|
|
|
|
obj-y += process.o
|
|
obj-y += fpu/
|
|
obj-y += ptrace.o
|
|
obj-$(CONFIG_X86_32) += tls.o
|
|
obj-$(CONFIG_IA32_EMULATION) += tls.o
|
|
obj-y += step.o
|
|
obj-$(CONFIG_INTEL_TXT) += tboot.o
|
|
obj-$(CONFIG_ISA_DMA_API) += i8237.o
|
|
obj-$(CONFIG_STACKTRACE) += stacktrace.o
|
|
obj-y += cpu/
|
|
obj-y += acpi/
|
|
obj-y += reboot.o
|
|
obj-$(CONFIG_X86_MSR) += msr.o
|
|
obj-$(CONFIG_X86_CPUID) += cpuid.o
|
|
obj-$(CONFIG_PCI) += early-quirks.o
|
|
apm-y := apm_32.o
|
|
obj-$(CONFIG_APM) += apm.o
|
|
obj-$(CONFIG_SMP) += smp.o
|
|
obj-$(CONFIG_SMP) += smpboot.o
|
|
obj-$(CONFIG_SMP) += tsc_sync.o
|
|
obj-$(CONFIG_SMP) += setup_percpu.o
|
|
obj-$(CONFIG_X86_MPPARSE) += mpparse.o
|
|
obj-y += apic/
|
|
obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o
|
|
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
|
|
obj-$(CONFIG_LIVEPATCH) += livepatch.o
|
|
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
|
|
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
|
|
obj-$(CONFIG_X86_TSC) += trace_clock.o
|
|
obj-$(CONFIG_KEXEC_CORE) += machine_kexec_$(BITS).o
|
|
obj-$(CONFIG_KEXEC_CORE) += relocate_kernel_$(BITS).o crash.o
|
|
obj-$(CONFIG_KEXEC_FILE) += kexec-bzimage64.o
|
|
obj-$(CONFIG_CRASH_DUMP) += crash_dump_$(BITS).o
|
|
obj-y += kprobes/
|
|
obj-$(CONFIG_MODULES) += module.o
|
|
obj-$(CONFIG_DOUBLEFAULT) += doublefault.o
|
|
obj-$(CONFIG_KGDB) += kgdb.o
|
|
obj-$(CONFIG_VM86) += vm86_32.o
|
|
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
|
|
|
|
obj-$(CONFIG_HPET_TIMER) += hpet.o
|
|
obj-$(CONFIG_APB_TIMER) += apb_timer.o
|
|
|
|
obj-$(CONFIG_AMD_NB) += amd_nb.o
|
|
obj-$(CONFIG_DEBUG_RODATA_TEST) += test_rodata.o
|
|
obj-$(CONFIG_DEBUG_NX_TEST) += test_nx.o
|
|
obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o
|
|
|
|
obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o
|
|
obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o
|
|
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= paravirt-spinlocks.o
|
|
obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o
|
|
obj-$(CONFIG_X86_PMEM_LEGACY_DEVICE) += pmem.o
|
|
|
|
obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
|
|
|
|
obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
|
|
|
|
obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
|
|
obj-$(CONFIG_OF) += devicetree.o
|
|
obj-$(CONFIG_UPROBES) += uprobes.o
|
|
obj-y += sysfb.o
|
|
obj-$(CONFIG_X86_SYSFB) += sysfb_simplefb.o
|
|
obj-$(CONFIG_EFI) += sysfb_efi.o
|
|
|
|
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
|
|
obj-$(CONFIG_TRACING) += tracepoint.o
|
|
|
|
ifdef CONFIG_FRAME_POINTER
|
|
obj-y += unwind_frame.o
|
|
else
|
|
obj-y += unwind_guess.o
|
|
endif
|
|
|
|
###
|
|
# 64 bit specific files
|
|
ifeq ($(CONFIG_X86_64),y)
|
|
obj-$(CONFIG_AUDIT) += audit_64.o
|
|
|
|
obj-$(CONFIG_GART_IOMMU) += amd_gart_64.o aperture_64.o
|
|
obj-$(CONFIG_CALGARY_IOMMU) += pci-calgary_64.o tce_64.o
|
|
|
|
obj-$(CONFIG_PCI_MMCONFIG) += mmconf-fam10h_64.o
|
|
obj-y += vsmp_64.o
|
|
endif
|