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objtool, x86: Add several functions and files to the objtool whitelist 

In preparation for an objtool rewrite which will have broader checks,
whitelist functions and files which cause problems because they do
unusual things with the stack.

These whitelists serve as a TODO list for which functions and files
don't yet have undwarf unwinder coverage.  Eventually most of the
whitelists can be removed in favor of manual CFI hint annotations or
objtool improvements.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/7f934a5d707a574bda33ea282e9478e627fb1829.1498659915.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2017-06-28 10:11:06 -05:00 committed by Ingo Molnar
parent dcc914f44f
commit c207aee480
15 changed files with 39 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/crypto/Makefile
View File

@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#
OBJECT_FILES_NON_STANDARD := y
avx_supported := $(call as-instr,vpxor %xmm0$(comma)%xmm0$(comma)%xmm0,yes,no)
avx2_supported := $(call as-instr,vpgatherdd %ymm0$(comma)(%eax$(comma)%ymm1\
$(comma)4)$(comma)%ymm2,yes,no)

2
arch/x86/crypto/sha1-mb/Makefile
View File

@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#
OBJECT_FILES_NON_STANDARD := y
avx2_supported := $(call as-instr,vpgatherdd %ymm0$(comma)(%eax$(comma)%ymm1\
$(comma)4)$(comma)%ymm2,yes,no)
ifeq ($(avx2_supported),yes)

2
arch/x86/crypto/sha256-mb/Makefile
View File

@ -2,6 +2,8 @@
# Arch-specific CryptoAPI modules.
#
OBJECT_FILES_NON_STANDARD := y
avx2_supported := $(call as-instr,vpgatherdd %ymm0$(comma)(%eax$(comma)%ymm1\
$(comma)4)$(comma)%ymm2,yes,no)
ifeq ($(avx2_supported),yes)

1
arch/x86/kernel/Makefile
View File

@ -29,6 +29,7 @@ OBJECT_FILES_NON_STANDARD_head_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_ftrace_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_test_nx.o := y
OBJECT_FILES_NON_STANDARD_paravirt_patch_$(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,

2
arch/x86/kernel/acpi/Makefile
View File

@ -1,3 +1,5 @@
OBJECT_FILES_NON_STANDARD_wakeup_$(BITS).o := y
obj-$(CONFIG_ACPI) += boot.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o
obj-$(CONFIG_ACPI_APEI) += apei.o

9
arch/x86/kernel/kprobes/opt.c
View File

@ -28,6 +28,7 @@
#include <linux/kdebug.h>
#include <linux/kallsyms.h>
#include <linux/ftrace.h>
#include <linux/frame.h>
#include <asm/text-patching.h>
#include <asm/cacheflush.h>
@ -94,6 +95,7 @@ static void synthesize_set_arg1(kprobe_opcode_t *addr, unsigned long val)
}
asm (
"optprobe_template_func:\n"
".global optprobe_template_entry\n"
"optprobe_template_entry:\n"
#ifdef CONFIG_X86_64
@ -131,7 +133,12 @@ asm (
" popf\n"
#endif
".global optprobe_template_end\n"
"optprobe_template_end:\n");
"optprobe_template_end:\n"
".type optprobe_template_func, @function\n"
".size optprobe_template_func, .-optprobe_template_func\n");
void optprobe_template_func(void);
STACK_FRAME_NON_STANDARD(optprobe_template_func);
#define TMPL_MOVE_IDX \
((long)&optprobe_template_val - (long)&optprobe_template_entry)

2
arch/x86/kernel/reboot.c
View File

@ -9,6 +9,7 @@
#include <linux/sched.h>
#include <linux/tboot.h>
#include <linux/delay.h>
#include <linux/frame.h>
#include <acpi/reboot.h>
#include <asm/io.h>
#include <asm/apic.h>
@ -123,6 +124,7 @@ void __noreturn machine_real_restart(unsigned int type)
#ifdef CONFIG_APM_MODULE
EXPORT_SYMBOL(machine_real_restart);
#endif
STACK_FRAME_NON_STANDARD(machine_real_restart);
/*
* Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot

2
arch/x86/kvm/svm.c
View File

@ -36,6 +36,7 @@
#include <linux/slab.h>
#include <linux/amd-iommu.h>
#include <linux/hashtable.h>
#include <linux/frame.h>
#include <asm/apic.h>
#include <asm/perf_event.h>
@ -4906,6 +4907,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
mark_all_clean(svm->vmcb);
}
STACK_FRAME_NON_STANDARD(svm_vcpu_run);
static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{

3
arch/x86/kvm/vmx.c
View File

@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <linux/tboot.h>
#include <linux/hrtimer.h>
#include <linux/frame.h>
#include "kvm_cache_regs.h"
#include "x86.h"
@ -8652,6 +8653,7 @@ static void vmx_handle_external_intr(struct kvm_vcpu *vcpu)
);
}
}
STACK_FRAME_NON_STANDARD(vmx_handle_external_intr);
static bool vmx_has_high_real_mode_segbase(void)
{
@ -9028,6 +9030,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx_recover_nmi_blocking(vmx);
vmx_complete_interrupts(vmx);
}
STACK_FRAME_NON_STANDARD(vmx_vcpu_run);
static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
{

8
arch/x86/lib/msr-reg.S
View File

@ -13,14 +13,14 @@
.macro op_safe_regs op
ENTRY(\op\()_safe_regs)
pushq %rbx
pushq %rbp
pushq %r12
movq %rdi, %r10 /* Save pointer */
xorl %r11d, %r11d /* Return value */
movl (%rdi), %eax
movl 4(%rdi), %ecx
movl 8(%rdi), %edx
movl 12(%rdi), %ebx
movl 20(%rdi), %ebp
movl 20(%rdi), %r12d
movl 24(%rdi), %esi
movl 28(%rdi), %edi
1: \op
@ -29,10 +29,10 @@ ENTRY(\op\()_safe_regs)
movl %ecx, 4(%r10)
movl %edx, 8(%r10)
movl %ebx, 12(%r10)
movl %ebp, 20(%r10)
movl %r12d, 20(%r10)
movl %esi, 24(%r10)
movl %edi, 28(%r10)
popq %rbp
popq %r12
popq %rbx
ret
3:

2
arch/x86/net/Makefile
View File

@ -1,4 +1,6 @@
#
# Arch-specific network modules
#
OBJECT_FILES_NON_STANDARD_bpf_jit.o += y
obj-$(CONFIG_BPF_JIT) += bpf_jit.o bpf_jit_comp.o

1
arch/x86/platform/efi/Makefile
View File

@ -1,4 +1,5 @@
OBJECT_FILES_NON_STANDARD_efi_thunk_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_efi_stub_$(BITS).o := y
obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
obj-$(CONFIG_EARLY_PRINTK_EFI) += early_printk.o

2
arch/x86/power/Makefile
View File

@ -1,3 +1,5 @@
OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y
# __restore_processor_state() restores %gs after S3 resume and so should not
# itself be stack-protected
nostackp := $(call cc-option, -fno-stack-protector)

3
arch/x86/xen/Makefile
View File

@ -1,3 +1,6 @@
OBJECT_FILES_NON_STANDARD_xen-asm_$(BITS).o := y
OBJECT_FILES_NON_STANDARD_xen-pvh.o := y
ifdef CONFIG_FUNCTION_TRACER
# Do not profile debug and lowlevel utilities
CFLAGS_REMOVE_spinlock.o = -pg

4
kernel/kexec_core.c
View File

@ -38,6 +38,7 @@
#include <linux/syscore_ops.h>
#include <linux/compiler.h>
#include <linux/hugetlb.h>
#include <linux/frame.h>
#include <asm/page.h>
#include <asm/sections.h>
@ -874,7 +875,7 @@ int kexec_load_disabled;
* only when panic_cpu holds the current CPU number; this is the only CPU
* which processes crash_kexec routines.
*/
void __crash_kexec(struct pt_regs *regs)
void __noclone __crash_kexec(struct pt_regs *regs)
{
/* Take the kexec_mutex here to prevent sys_kexec_load
* running on one cpu from replacing the crash kernel
@ -896,6 +897,7 @@ void __crash_kexec(struct pt_regs *regs)
mutex_unlock(&kexec_mutex);
}
}
STACK_FRAME_NON_STANDARD(__crash_kexec);
void crash_kexec(struct pt_regs *regs)
{