From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Wed, 28 Jun 2017 10:11:06 -0500
Subject: objtool, x86: Add several functions and files to the objtool
whitelist
Patch-mainline: v4.13-rc1
Git-commit: c207aee48037abca71c669cbec407b9891965c34
References: bnc#1018348
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/x86/crypto/Makefile | 2 ++
arch/x86/crypto/sha1-mb/Makefile | 2 ++
arch/x86/crypto/sha256-mb/Makefile | 2 ++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/acpi/Makefile | 2 ++
arch/x86/kernel/kprobes/opt.c | 9 ++++++++-
arch/x86/kernel/reboot.c | 2 ++
arch/x86/kvm/svm.c | 2 ++
arch/x86/kvm/vmx.c | 3 +++
arch/x86/lib/msr-reg.S | 8 ++++----
arch/x86/net/Makefile | 2 ++
arch/x86/platform/efi/Makefile | 1 +
arch/x86/power/Makefile | 2 ++
arch/x86/xen/Makefile | 3 +++
kernel/kexec_core.c | 4 +++-
15 files changed, 39 insertions(+), 6 deletions(-)
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -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)
--- a/arch/x86/crypto/sha1-mb/Makefile
+++ b/arch/x86/crypto/sha1-mb/Makefile
@@ -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)
--- a/arch/x86/crypto/sha256-mb/Makefile
+++ b/arch/x86/crypto/sha256-mb/Makefile
@@ -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 ($(avx2_supported),yes)
--- a/arch/x86/kernel/acpi/Makefile
+++ b/arch/x86/kernel/acpi/Makefile
@@ -1,3 +1,5 @@
+OBJECT_FILES_NON_STANDARD_wakeup_$(BITS).o := y
+
obj-$(CONFIG_ACPI) += boot.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o
obj-$(CONFIG_ACPI_APEI) += apei.o
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -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_o
}
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)
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -30,6 +30,7 @@ OBJECT_FILES_NON_STANDARD_head_$(BITS).o
OBJECT_FILES_NON_STANDARD_relocate_kernel_$(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,
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -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(uns
#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
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -40,6 +40,7 @@
#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>
@@ -5405,6 +5406,7 @@ static void svm_vcpu_run(struct kvm_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)
{
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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"
@@ -9130,6 +9131,7 @@ static void vmx_handle_external_intr(str
);
}
}
+STACK_FRAME_NON_STANDARD(vmx_handle_external_intr);
static bool vmx_has_high_real_mode_segbase(void)
{
@@ -9530,6 +9532,7 @@ static void __noclone vmx_vcpu_run(struc
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)
{
--- a/arch/x86/lib/msr-reg.S
+++ b/arch/x86/lib/msr-reg.S
@@ -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:
--- a/arch/x86/net/Makefile
+++ b/arch/x86/net/Makefile
@@ -1,4 +1,6 @@
#
# Arch-specific network modules
#
+OBJECT_FILES_NON_STANDARD_bpf_jit.o += y
+
obj-$(CONFIG_BPF_JIT) += bpf_jit.o bpf_jit_comp.o
--- a/arch/x86/platform/efi/Makefile
+++ b/arch/x86/platform/efi/Makefile
@@ -1,4 +1,5 @@
OBJECT_FILES_NON_STANDARD_efi_thunk_$(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-$(CONFIG_EARLY_PRINTK_EFI) += early_printk.o
--- a/arch/x86/power/Makefile
+++ b/arch/x86/power/Makefile
@@ -1,3 +1,5 @@
+OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y
+
# __restore_processor_state() restores %gs after S3 resume and so should not
# itself be stack-protected
nostackp := $(call cc-option, -fno-stack-protector)
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -1,3 +1,6 @@
+OBJECT_FILES_NON_STANDARD_xen-asm_$(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
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -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>
@@ -923,7 +924,7 @@ 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
@@ -945,6 +946,7 @@ void __crash_kexec(struct pt_regs *regs)
mutex_unlock(&kexec_mutex);
}
}
+STACK_FRAME_NON_STANDARD(__crash_kexec);
void crash_kexec(struct pt_regs *regs)
{