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x86: Apply more __ro_after_init and const

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Guided by grsecurity's analogous __read_only markings in arch/x86,
this applies several uses of __ro_after_init to structures that are
only updated during __init, and const for some structures that are
never updated.  Additionally extends __init markings to some functions
that are only used during __init, and cleans up some missing C99 style
static initializers.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Brown <david.brown@linaro.org>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Emese Revfy <re.emese@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20160808232906.GA29731@www.outflux.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kees Cook 2016-08-08 16:29:06 -07:00 committed by Ingo Molnar
parent fb754f958f
commit 404f6aac9b
24 changed files with 45 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/desc.h
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@ -36,7 +36,7 @@ static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *in
extern struct desc_ptr idt_descr;
extern gate_desc idt_table[];
extern struct desc_ptr debug_idt_descr;
extern const struct desc_ptr debug_idt_descr;
extern gate_desc debug_idt_table[];
struct gdt_page {

3
arch/x86/include/asm/fpu/xstate.h
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@ -45,7 +45,8 @@
extern u64 xfeatures_mask;
extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
extern void __init update_regset_xstate_info(unsigned int size,
u64 xstate_mask);
void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xstate);

6
arch/x86/kernel/apic/apic_flat_64.c
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@ -25,7 +25,7 @@
static struct apic apic_physflat;
static struct apic apic_flat;
struct apic __read_mostly *apic = &apic_flat;
struct apic *apic __ro_after_init = &apic_flat;
EXPORT_SYMBOL_GPL(apic);
static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
@ -154,7 +154,7 @@ static int flat_probe(void)
return 1;
}
static struct apic apic_flat = {
static struct apic apic_flat __ro_after_init = {
.name = "flat",
.probe = flat_probe,
.acpi_madt_oem_check = flat_acpi_madt_oem_check,
@ -248,7 +248,7 @@ static int physflat_probe(void)
return 0;
}
static struct apic apic_physflat = {
static struct apic apic_physflat __ro_after_init = {
.name = "physical flat",
.probe = physflat_probe,

2
arch/x86/kernel/apic/apic_noop.c
View File

@ -108,7 +108,7 @@ static void noop_apic_write(u32 reg, u32 v)
WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic);
}
struct apic apic_noop = {
struct apic apic_noop __ro_after_init = {
.name = "noop",
.probe = noop_probe,
.acpi_madt_oem_check = NULL,

2
arch/x86/kernel/apic/bigsmp_32.c
View File

@ -142,7 +142,7 @@ static int probe_bigsmp(void)
return dmi_bigsmp;
}
static struct apic apic_bigsmp = {
static struct apic apic_bigsmp __ro_after_init = {
.name = "bigsmp",
.probe = probe_bigsmp,

2
arch/x86/kernel/apic/msi.c
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@ -269,7 +269,7 @@ static void hpet_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
hpet_msi_write(irq_data_get_irq_handler_data(data), msg);
}
static struct irq_chip hpet_msi_controller = {
static struct irq_chip hpet_msi_controller __ro_after_init = {
.name = "HPET-MSI",
.irq_unmask = hpet_msi_unmask,
.irq_mask = hpet_msi_mask,

4
arch/x86/kernel/apic/probe_32.c
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@ -72,7 +72,7 @@ static int probe_default(void)
return 1;
}
static struct apic apic_default = {
static struct apic apic_default __ro_after_init = {
.name = "default",
.probe = probe_default,
@ -126,7 +126,7 @@ static struct apic apic_default = {
apic_driver(apic_default);
struct apic *apic = &apic_default;
struct apic *apic __ro_after_init = &apic_default;
EXPORT_SYMBOL_GPL(apic);
static int cmdline_apic __initdata;

2
arch/x86/kernel/apic/x2apic_cluster.c
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@ -222,7 +222,7 @@ static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask,
cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu));
}
static struct apic apic_x2apic_cluster = {
static struct apic apic_x2apic_cluster __ro_after_init = {
.name = "cluster x2apic",
.probe = x2apic_cluster_probe,

2
arch/x86/kernel/apic/x2apic_phys.c
View File

@ -98,7 +98,7 @@ static int x2apic_phys_probe(void)
return apic == &apic_x2apic_phys;
}
static struct apic apic_x2apic_phys = {
static struct apic apic_x2apic_phys __ro_after_init = {
.name = "physical x2apic",
.probe = x2apic_phys_probe,

2
arch/x86/kernel/apic/x2apic_uv_x.c
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@ -554,7 +554,7 @@ static int uv_probe(void)
return apic == &apic_x2apic_uv_x;
}
static struct apic __refdata apic_x2apic_uv_x = {
static struct apic apic_x2apic_uv_x __ro_after_init = {
.name = "UV large system",
.probe = uv_probe,

11
arch/x86/kernel/cpu/common.c
View File

@ -1265,9 +1265,14 @@ static __init int setup_disablecpuid(char *arg)
__setup("clearcpuid=", setup_disablecpuid);
#ifdef CONFIG_X86_64
struct desc_ptr idt_descr = { NR_VECTORS * 16 - 1, (unsigned long) idt_table };
struct desc_ptr debug_idt_descr = { NR_VECTORS * 16 - 1,
(unsigned long) debug_idt_table };
struct desc_ptr idt_descr __ro_after_init = {
.size = NR_VECTORS * 16 - 1,
.address = (unsigned long) idt_table,
};
const struct desc_ptr debug_idt_descr = {
.size = NR_VECTORS * 16 - 1,
.address = (unsigned long) debug_idt_table,
};
DEFINE_PER_CPU_FIRST(union irq_stack_union,
irq_stack_union) __aligned(PAGE_SIZE) __visible;

4
arch/x86/kernel/cpu/mtrr/main.c
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@ -72,14 +72,14 @@ static DEFINE_MUTEX(mtrr_mutex);
u64 size_or_mask, size_and_mask;
static bool mtrr_aps_delayed_init;
static const struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
static const struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM] __ro_after_init;
const struct mtrr_ops *mtrr_if;
static void set_mtrr(unsigned int reg, unsigned long base,
unsigned long size, mtrr_type type);
void set_mtrr_ops(const struct mtrr_ops *ops)
void __init set_mtrr_ops(const struct mtrr_ops *ops)
{
if (ops->vendor && ops->vendor < X86_VENDOR_NUM)
mtrr_ops[ops->vendor] = ops;

2
arch/x86/kernel/cpu/mtrr/mtrr.h
View File

@ -54,7 +54,7 @@ void fill_mtrr_var_range(unsigned int index,
bool get_mtrr_state(void);
void mtrr_bp_pat_init(void);
extern void set_mtrr_ops(const struct mtrr_ops *ops);
extern void __init set_mtrr_ops(const struct mtrr_ops *ops);
extern u64 size_or_mask, size_and_mask;
extern const struct mtrr_ops *mtrr_if;

2
arch/x86/kernel/ksysfs.c
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@ -184,7 +184,7 @@ out:
static struct kobj_attribute type_attr = __ATTR_RO(type);
static struct bin_attribute data_attr = {
static struct bin_attribute data_attr __ro_after_init = {
.attr = {
.name = "data",
.mode = S_IRUGO,

2
arch/x86/kernel/kvmclock.c
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@ -29,7 +29,7 @@
#include <asm/x86_init.h>
#include <asm/reboot.h>
static int kvmclock = 1;
static int kvmclock __ro_after_init = 1;
static int msr_kvm_system_time = MSR_KVM_SYSTEM_TIME;
static int msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK;
static cycle_t kvm_sched_clock_offset;

2
arch/x86/kernel/paravirt.c
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@ -389,7 +389,7 @@ NOKPROBE_SYMBOL(native_load_idt);
#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
#endif
struct pv_mmu_ops pv_mmu_ops = {
struct pv_mmu_ops pv_mmu_ops __ro_after_init = {
.read_cr2 = native_read_cr2,
.write_cr2 = native_write_cr2,

6
arch/x86/kernel/ptrace.c
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@ -1250,7 +1250,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
#ifdef CONFIG_X86_64
static struct user_regset x86_64_regsets[] __read_mostly = {
static struct user_regset x86_64_regsets[] __ro_after_init = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = sizeof(struct user_regs_struct) / sizeof(long),
@ -1291,7 +1291,7 @@ static const struct user_regset_view user_x86_64_view = {
#endif /* CONFIG_X86_64 */
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
static struct user_regset x86_32_regsets[] __read_mostly = {
static struct user_regset x86_32_regsets[] __ro_after_init = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = sizeof(struct user_regs_struct32) / sizeof(u32),
@ -1344,7 +1344,7 @@ static const struct user_regset_view user_x86_32_view = {
*/
u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
{
#ifdef CONFIG_X86_64
x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);

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

@ -705,7 +705,7 @@ static void native_machine_power_off(void)
tboot_shutdown(TB_SHUTDOWN_HALT);
}
struct machine_ops machine_ops = {
struct machine_ops machine_ops __ro_after_init = {
.power_off = native_machine_power_off,
.shutdown = native_machine_shutdown,
.emergency_restart = native_machine_emergency_restart,

4
arch/x86/kernel/setup.c
View File

@ -210,9 +210,9 @@ EXPORT_SYMBOL(boot_cpu_data);
#if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
__visible unsigned long mmu_cr4_features;
__visible unsigned long mmu_cr4_features __ro_after_init;
#else
__visible unsigned long mmu_cr4_features = X86_CR4_PAE;
__visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
#endif
/* Boot loader ID and version as integers, for the benefit of proc_dointvec */

2
arch/x86/kernel/setup_percpu.c
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@ -33,7 +33,7 @@ EXPORT_PER_CPU_SYMBOL(cpu_number);
DEFINE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET;
EXPORT_PER_CPU_SYMBOL(this_cpu_off);
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init = {
[0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,
};
EXPORT_SYMBOL(__per_cpu_offset);

6
arch/x86/kernel/x86_init.c
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@ -91,7 +91,7 @@ struct x86_cpuinit_ops x86_cpuinit = {
static void default_nmi_init(void) { };
static int default_i8042_detect(void) { return 1; };
struct x86_platform_ops x86_platform = {
struct x86_platform_ops x86_platform __ro_after_init = {
.calibrate_cpu = native_calibrate_cpu,
.calibrate_tsc = native_calibrate_tsc,
.get_wallclock = mach_get_cmos_time,
@ -108,7 +108,7 @@ struct x86_platform_ops x86_platform = {
EXPORT_SYMBOL_GPL(x86_platform);
#if defined(CONFIG_PCI_MSI)
struct x86_msi_ops x86_msi = {
struct x86_msi_ops x86_msi __ro_after_init = {
.setup_msi_irqs = native_setup_msi_irqs,
.teardown_msi_irq = native_teardown_msi_irq,
.teardown_msi_irqs = default_teardown_msi_irqs,
@ -137,7 +137,7 @@ void arch_restore_msi_irqs(struct pci_dev *dev)
}
#endif
struct x86_io_apic_ops x86_io_apic_ops = {
struct x86_io_apic_ops x86_io_apic_ops __ro_after_init = {
.read = native_io_apic_read,
.disable = native_disable_io_apic,
};

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

@ -4961,7 +4961,7 @@ static inline void avic_post_state_restore(struct kvm_vcpu *vcpu)
avic_handle_ldr_update(vcpu);
}
static struct kvm_x86_ops svm_x86_ops = {
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
.hardware_setup = svm_hardware_setup,

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

@ -11175,7 +11175,7 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
~FEATURE_CONTROL_LMCE;
}
static struct kvm_x86_ops vmx_x86_ops = {
static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
.hardware_setup = hardware_setup,

7
arch/x86/pci/pcbios.c
View File

@ -120,9 +120,12 @@ static unsigned long __init bios32_service(unsigned long service)
static struct {
unsigned long address;
unsigned short segment;
} pci_indirect = { 0, __KERNEL_CS };
} pci_indirect __ro_after_init = {
.address = 0,
.segment = __KERNEL_CS,
};
static int pci_bios_present;
static int pci_bios_present __ro_after_init;
static int __init check_pcibios(void)
{