diff options
| -rw-r--r-- | arch/x86/entry/vdso/vma.c | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/desc.h | 58 | ||||
| -rw-r--r-- | arch/x86/include/asm/fixmap.h | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/stackprotector.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/acpi/sleep.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/apm_32.c | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 29 | ||||
| -rw-r--r-- | arch/x86/kernel/setup_percpu.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 2 | ||||
| -rw-r--r-- | arch/x86/platform/efi/efi_32.c | 4 | ||||
| -rw-r--r-- | arch/x86/power/cpu.c | 7 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten.c | 5 | ||||
| -rw-r--r-- | arch/x86/xen/mmu.c | 1 | ||||
| -rw-r--r-- | arch/x86/xen/smp.c | 2 | ||||
| -rw-r--r-- | drivers/lguest/x86/core.c | 6 | ||||
| -rw-r--r-- | drivers/pnp/pnpbios/bioscalls.c | 10 |
17 files changed, 114 insertions, 29 deletions
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index 226ca70..5c5d4d7 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -354,7 +354,7 @@ static void vgetcpu_cpu_init(void *arg) d.p = 1; /* Present */ d.d = 1; /* 32-bit */ - write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S); + write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S); } static int vgetcpu_online(unsigned int cpu) diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index 1548ca9..4b5ef0c 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -4,6 +4,7 @@ #include <asm/desc_defs.h> #include <asm/ldt.h> #include <asm/mmu.h> +#include <asm/fixmap.h> #include <linux/smp.h> #include <linux/percpu.h> @@ -38,6 +39,7 @@ extern struct desc_ptr idt_descr; extern gate_desc idt_table[]; extern const struct desc_ptr debug_idt_descr; extern gate_desc debug_idt_table[]; +extern pgprot_t pg_fixmap_gdt_flags; struct gdt_page { struct desc_struct gdt[GDT_ENTRIES]; @@ -45,11 +47,57 @@ struct gdt_page { DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page); -static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu) +/* Provide the original GDT */ +static inline struct desc_struct *get_cpu_gdt_rw(unsigned int cpu) { return per_cpu(gdt_page, cpu).gdt; } +static inline unsigned long get_cpu_gdt_rw_vaddr(unsigned int cpu) +{ + return (unsigned long)get_cpu_gdt_rw(cpu); +} + +/* Provide the current original GDT */ +static inline struct desc_struct *get_current_gdt_rw(void) +{ + return this_cpu_ptr(&gdt_page)->gdt; +} + +static inline unsigned long get_current_gdt_rw_vaddr(void) +{ + return (unsigned long)get_current_gdt_rw(); +} + +/* Get the fixmap index for a specific processor */ +static inline unsigned int get_cpu_gdt_ro_index(int cpu) +{ + return FIX_GDT_REMAP_BEGIN + cpu; +} + +/* Provide the fixmap address of the remapped GDT */ +static inline struct desc_struct *get_cpu_gdt_ro(int cpu) +{ + unsigned int idx = get_cpu_gdt_ro_index(cpu); + return (struct desc_struct *)__fix_to_virt(idx); +} + +static inline unsigned long get_cpu_gdt_ro_vaddr(int cpu) +{ + return (unsigned long)get_cpu_gdt_ro(cpu); +} + +/* Provide the current read-only GDT */ +static inline struct desc_struct *get_current_gdt_ro(void) +{ + return get_cpu_gdt_ro(smp_processor_id()); +} + +static inline unsigned long get_current_gdt_ro_vaddr(void) +{ + return (unsigned long)get_current_gdt_ro(); +} + #ifdef CONFIG_X86_64 static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func, @@ -174,7 +222,7 @@ static inline void set_tssldt_descriptor(void *d, unsigned long addr, unsigned t static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr) { - struct desc_struct *d = get_cpu_gdt_table(cpu); + struct desc_struct *d = get_cpu_gdt_rw(cpu); tss_desc tss; set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS, @@ -194,7 +242,7 @@ static inline void native_set_ldt(const void *addr, unsigned int entries) set_tssldt_descriptor(&ldt, (unsigned long)addr, DESC_LDT, entries * LDT_ENTRY_SIZE - 1); - write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, + write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_LDT, &ldt, DESC_LDT); asm volatile("lldt %w0"::"q" (GDT_ENTRY_LDT*8)); } @@ -209,7 +257,7 @@ DECLARE_PER_CPU(bool, __tss_limit_invalid); static inline void force_reload_TR(void) { - struct desc_struct *d = get_cpu_gdt_table(smp_processor_id()); + struct desc_struct *d = get_current_gdt_rw(); tss_desc tss; memcpy(&tss, &d[GDT_ENTRY_TSS], sizeof(tss_desc)); @@ -288,7 +336,7 @@ static inline unsigned long native_store_tr(void) static inline void native_load_tls(struct thread_struct *t, unsigned int cpu) { - struct desc_struct *gdt = get_cpu_gdt_table(cpu); + struct desc_struct *gdt = get_cpu_gdt_rw(cpu); unsigned int i; for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++) diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h index 8554f96..b65155c 100644 --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -100,6 +100,10 @@ enum fixed_addresses { #ifdef CONFIG_X86_INTEL_MID FIX_LNW_VRTC, #endif + /* Fixmap entries to remap the GDTs, one per processor. */ + FIX_GDT_REMAP_BEGIN, + FIX_GDT_REMAP_END = FIX_GDT_REMAP_BEGIN + NR_CPUS - 1, + __end_of_permanent_fixed_addresses, /* diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 7caa2ac..1150e1b 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -716,6 +716,7 @@ extern struct desc_ptr early_gdt_descr; extern void cpu_set_gdt(int); extern void switch_to_new_gdt(int); +extern void load_fixmap_gdt(int); extern void load_percpu_segment(int); extern void cpu_init(void); diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h index 58505f0..dcbd9bc 100644 --- a/arch/x86/include/asm/stackprotector.h +++ b/arch/x86/include/asm/stackprotector.h @@ -87,7 +87,7 @@ static inline void setup_stack_canary_segment(int cpu) { #ifdef CONFIG_X86_32 unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu); - struct desc_struct *gdt_table = get_cpu_gdt_table(cpu); + struct desc_struct *gdt_table = get_cpu_gdt_rw(cpu); struct desc_struct desc; desc = gdt_table[GDT_ENTRY_STACK_CANARY]; diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c index 4858733..ed01481 100644 --- a/arch/x86/kernel/acpi/sleep.c +++ b/arch/x86/kernel/acpi/sleep.c @@ -101,7 +101,7 @@ int x86_acpi_suspend_lowlevel(void) #ifdef CONFIG_SMP initial_stack = (unsigned long)temp_stack + sizeof(temp_stack); early_gdt_descr.address = - (unsigned long)get_cpu_gdt_table(smp_processor_id()); + (unsigned long)get_cpu_gdt_rw(smp_processor_id()); initial_gs = per_cpu_offset(smp_processor_id()); #endif initial_code = (unsigned long)wakeup_long64; diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index 5a41454..446b0d3 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -609,7 +609,7 @@ static long __apm_bios_call(void *_call) cpu = get_cpu(); BUG_ON(cpu != 0); - gdt = get_cpu_gdt_table(cpu); + gdt = get_cpu_gdt_rw(cpu); save_desc_40 = gdt[0x40 / 8]; gdt[0x40 / 8] = bad_bios_desc; @@ -685,7 +685,7 @@ static long __apm_bios_call_simple(void *_call) cpu = get_cpu(); BUG_ON(cpu != 0); - gdt = get_cpu_gdt_table(cpu); + gdt = get_cpu_gdt_rw(cpu); save_desc_40 = gdt[0x40 / 8]; gdt[0x40 / 8] = bad_bios_desc; @@ -2352,7 +2352,7 @@ static int __init apm_init(void) * Note we only set APM segments on CPU zero, since we pin the APM * code to that CPU. */ - gdt = get_cpu_gdt_table(0); + gdt = get_cpu_gdt_rw(0); set_desc_base(&gdt[APM_CS >> 3], (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); set_desc_base(&gdt[APM_CS_16 >> 3], diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 58094a1..3cf1590 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -448,6 +448,26 @@ void load_percpu_segment(int cpu) load_stack_canary_segment(); } +/* Used by XEN to force the GDT read-only when required */ +pgprot_t pg_fixmap_gdt_flags = PAGE_KERNEL; + +/* Setup the fixmap mapping only once per-processor */ +static inline void setup_fixmap_gdt(int cpu) +{ + __set_fixmap(get_cpu_gdt_ro_index(cpu), + __pa(get_cpu_gdt_rw(cpu)), pg_fixmap_gdt_flags); +} + +/* Load a fixmap remapping of the per-cpu GDT */ +void load_fixmap_gdt(int cpu) +{ + struct desc_ptr gdt_descr; + + gdt_descr.address = (long)get_cpu_gdt_ro(cpu); + gdt_descr.size = GDT_SIZE - 1; + load_gdt(&gdt_descr); +} + /* * Current gdt points %fs at the "master" per-cpu area: after this, * it's on the real one. @@ -456,11 +476,10 @@ void switch_to_new_gdt(int cpu) { struct desc_ptr gdt_descr; - gdt_descr.address = (long)get_cpu_gdt_table(cpu); + gdt_descr.address = (long)get_cpu_gdt_rw(cpu); gdt_descr.size = GDT_SIZE - 1; load_gdt(&gdt_descr); /* Reload the per-cpu base */ - load_percpu_segment(cpu); } @@ -1526,6 +1545,9 @@ void cpu_init(void) if (is_uv_system()) uv_cpu_init(); + + setup_fixmap_gdt(cpu); + load_fixmap_gdt(cpu); } #else @@ -1581,6 +1603,9 @@ void cpu_init(void) dbg_restore_debug_regs(); fpu__init_cpu(); + + setup_fixmap_gdt(cpu); + load_fixmap_gdt(cpu); } #endif diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c index 9820d6d..11338b0 100644 --- a/arch/x86/kernel/setup_percpu.c +++ b/arch/x86/kernel/setup_percpu.c @@ -160,7 +160,7 @@ static inline void setup_percpu_segment(int cpu) pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF, 0x2 | DESCTYPE_S, 0x8); gdt.s = 1; - write_gdt_entry(get_cpu_gdt_table(cpu), + write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S); #endif } diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index bd1f1ad..f04479a 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -983,7 +983,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle) unsigned long timeout; idle->thread.sp = (unsigned long)task_pt_regs(idle); - early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); + early_gdt_descr.address = (unsigned long)get_cpu_gdt_rw(cpu); initial_code = (unsigned long)start_secondary; initial_stack = idle->thread.sp; diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c index cef39b0..9500711 100644 --- a/arch/x86/platform/efi/efi_32.c +++ b/arch/x86/platform/efi/efi_32.c @@ -68,7 +68,7 @@ pgd_t * __init efi_call_phys_prolog(void) load_cr3(initial_page_table); __flush_tlb_all(); - gdt_descr.address = __pa(get_cpu_gdt_table(0)); + gdt_descr.address = __pa(get_cpu_gdt_rw(0)); gdt_descr.size = GDT_SIZE - 1; load_gdt(&gdt_descr); @@ -79,7 +79,7 @@ void __init efi_call_phys_epilog(pgd_t *save_pgd) { struct desc_ptr gdt_descr; - gdt_descr.address = (unsigned long)get_cpu_gdt_table(0); + gdt_descr.address = (unsigned long)get_cpu_gdt_rw(0); gdt_descr.size = GDT_SIZE - 1; load_gdt(&gdt_descr); diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index 66ade16..6b05a92 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -95,7 +95,7 @@ static void __save_processor_state(struct saved_context *ctxt) * 'pmode_gdt' in wakeup_start. */ ctxt->gdt_desc.size = GDT_SIZE - 1; - ctxt->gdt_desc.address = (unsigned long)get_cpu_gdt_table(smp_processor_id()); + ctxt->gdt_desc.address = (unsigned long)get_cpu_gdt_rw(smp_processor_id()); store_tr(ctxt->tr); @@ -162,7 +162,7 @@ static void fix_processor_context(void) int cpu = smp_processor_id(); struct tss_struct *t = &per_cpu(cpu_tss, cpu); #ifdef CONFIG_X86_64 - struct desc_struct *desc = get_cpu_gdt_table(cpu); + struct desc_struct *desc = get_cpu_gdt_rw(cpu); tss_desc tss; #endif set_tss_desc(cpu, t); /* @@ -183,6 +183,9 @@ static void fix_processor_context(void) load_mm_ldt(current->active_mm); /* This does lldt */ fpu__resume_cpu(); + + /* The processor is back on the direct GDT, load back the fixmap */ + load_fixmap_gdt(cpu); } /** diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index ec1d5c4..08faa61 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -710,7 +710,7 @@ static void load_TLS_descriptor(struct thread_struct *t, *shadow = t->tls_array[i]; - gdt = get_cpu_gdt_table(cpu); + gdt = get_cpu_gdt_rw(cpu); maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); mc = __xen_mc_entry(0); @@ -1545,6 +1545,9 @@ asmlinkage __visible void __init xen_start_kernel(void) */ xen_initial_gdt = &per_cpu(gdt_page, 0); + /* GDT can only be remapped RO */ + pg_fixmap_gdt_flags = PAGE_KERNEL_RO; + xen_smp_init(); #ifdef CONFIG_ACPI_NUMA diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 37cb5aa..ebbfe00 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -2326,6 +2326,7 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) #endif case FIX_TEXT_POKE0: case FIX_TEXT_POKE1: + case FIX_GDT_REMAP_BEGIN ... FIX_GDT_REMAP_END: /* All local page mappings */ pte = pfn_pte(phys, prot); break; diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index 7ff2f1b..eaa3616 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -392,7 +392,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle) if (ctxt == NULL) return -ENOMEM; - gdt = get_cpu_gdt_table(cpu); + gdt = get_cpu_gdt_rw(cpu); #ifdef CONFIG_X86_32 ctxt->user_regs.fs = __KERNEL_PERCPU; diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index d71f632..b4f79b9 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -504,7 +504,7 @@ void __init lguest_arch_host_init(void) * byte, not the size, hence the "-1"). */ state->host_gdt_desc.size = GDT_SIZE-1; - state->host_gdt_desc.address = (long)get_cpu_gdt_table(i); + state->host_gdt_desc.address = (long)get_cpu_gdt_rw(i); /* * All CPUs on the Host use the same Interrupt Descriptor @@ -554,8 +554,8 @@ void __init lguest_arch_host_init(void) * The Host needs to be able to use the LGUEST segments on this * CPU, too, so put them in the Host GDT. */ - get_cpu_gdt_table(i)[GDT_ENTRY_LGUEST_CS] = FULL_EXEC_SEGMENT; - get_cpu_gdt_table(i)[GDT_ENTRY_LGUEST_DS] = FULL_SEGMENT; + get_cpu_gdt_rw(i)[GDT_ENTRY_LGUEST_CS] = FULL_EXEC_SEGMENT; + get_cpu_gdt_rw(i)[GDT_ENTRY_LGUEST_DS] = FULL_SEGMENT; } /* diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c index 438d4c7..ff563db 100644 --- a/drivers/pnp/pnpbios/bioscalls.c +++ b/drivers/pnp/pnpbios/bioscalls.c @@ -54,7 +54,7 @@ __asm__(".text \n" #define Q2_SET_SEL(cpu, selname, address, size) \ do { \ - struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \ + struct desc_struct *gdt = get_cpu_gdt_rw((cpu)); \ set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \ set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \ } while(0) @@ -95,8 +95,8 @@ static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, return PNP_FUNCTION_NOT_SUPPORTED; cpu = get_cpu(); - save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8]; - get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc; + save_desc_40 = get_cpu_gdt_rw(cpu)[0x40 / 8]; + get_cpu_gdt_rw(cpu)[0x40 / 8] = bad_bios_desc; /* On some boxes IRQ's during PnP BIOS calls are deadly. */ spin_lock_irqsave(&pnp_bios_lock, flags); @@ -134,7 +134,7 @@ static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3, :"memory"); spin_unlock_irqrestore(&pnp_bios_lock, flags); - get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40; + get_cpu_gdt_rw(cpu)[0x40 / 8] = save_desc_40; put_cpu(); /* If we get here and this is set then the PnP BIOS faulted on us. */ @@ -477,7 +477,7 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header) pnp_bios_callpoint.segment = PNP_CS16; for_each_possible_cpu(i) { - struct desc_struct *gdt = get_cpu_gdt_table(i); + struct desc_struct *gdt = get_cpu_gdt_rw(i); if (!gdt) continue; set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32], |
