From 4fed46b725eeb81ae0c3aa55167eccb7d9bfae85 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Mon, 4 Dec 2017 15:07:20 +0100 Subject: [PATCH 150/231] x86/entry: Remap the TSS into the CPU entry area MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit CVE-2017-5754 This has a secondary purpose: it puts the entry stack into a region with a well-controlled layout. A subsequent patch will take advantage of this to streamline the SYSCALL entry code to be able to find it more easily. Signed-off-by: Andy Lutomirski Signed-off-by: Thomas Gleixner Reviewed-by: Thomas Gleixner Reviewed-by: Borislav Petkov Cc: Boris Ostrovsky Cc: Borislav Petkov Cc: Brian Gerst Cc: Dave Hansen Cc: Dave Hansen Cc: David Laight Cc: Denys Vlasenko Cc: Eduardo Valentin Cc: Greg KH Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Juergen Gross Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Will Deacon Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Link: https://lkml.kernel.org/r/20171204150605.962042855@linutronix.de Signed-off-by: Ingo Molnar (cherry picked from commit 72f5e08dbba2d01aa90b592cf76c378ea233b00b) Signed-off-by: Andy Whitcroft Signed-off-by: Kleber Sacilotto de Souza (cherry picked from commit 475b37e78defbc4cb91d54e2bcf18aa75611bb3a) Signed-off-by: Fabian Grünbichler --- arch/x86/include/asm/fixmap.h | 7 +++++++ arch/x86/kernel/asm-offsets.c | 3 +++ arch/x86/kernel/cpu/common.c | 41 +++++++++++++++++++++++++++++++++++------ arch/x86/kernel/dumpstack.c | 3 ++- arch/x86/kvm/vmx.c | 2 +- arch/x86/power/cpu.c | 11 ++++++----- arch/x86/entry/entry_32.S | 6 ++++-- 7 files changed, 58 insertions(+), 15 deletions(-) diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h index 8c6ed66fe957..c92fc30e6def 100644 --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -54,6 +54,13 @@ extern unsigned long __FIXADDR_TOP; */ struct cpu_entry_area { char gdt[PAGE_SIZE]; + + /* + * The GDT is just below cpu_tss and thus serves (on x86_64) as a + * a read-only guard page for the SYSENTER stack at the bottom + * of the TSS region. + */ + struct tss_struct tss; }; #define CPU_ENTRY_AREA_PAGES (sizeof(struct cpu_entry_area) / PAGE_SIZE) diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c index 031bd35bd911..f765c3253ec3 100644 --- a/arch/x86/kernel/asm-offsets.c +++ b/arch/x86/kernel/asm-offsets.c @@ -97,4 +97,7 @@ void common(void) { OFFSET(CPU_TSS_SYSENTER_stack, tss_struct, SYSENTER_stack); /* Size of SYSENTER_stack */ DEFINE(SIZEOF_SYSENTER_stack, sizeof(((struct tss_struct *)0)->SYSENTER_stack)); + + /* Layout info for cpu_entry_area */ + OFFSET(CPU_ENTRY_AREA_tss, cpu_entry_area, tss); } diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index e61eff11f562..4a38de4c6ede 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -466,6 +466,22 @@ void load_percpu_segment(int cpu) load_stack_canary_segment(); } +static void set_percpu_fixmap_pages(int fixmap_index, void *ptr, + int pages, pgprot_t prot) +{ + int i; + + for (i = 0; i < pages; i++) { + __set_fixmap(fixmap_index - i, + per_cpu_ptr_to_phys(ptr + i * PAGE_SIZE), prot); + } +} + +#ifdef CONFIG_X86_32 +/* The 32-bit entry code needs to find cpu_entry_area. */ +DEFINE_PER_CPU(struct cpu_entry_area *, cpu_entry_area); +#endif + /* Setup the fixmap mappings only once per-processor */ static inline void setup_cpu_entry_area(int cpu) { @@ -507,7 +523,15 @@ static inline void setup_cpu_entry_area(int cpu) */ BUILD_BUG_ON((offsetof(struct tss_struct, x86_tss) ^ offsetofend(struct tss_struct, x86_tss)) & PAGE_MASK); + BUILD_BUG_ON(sizeof(struct tss_struct) % PAGE_SIZE != 0); + set_percpu_fixmap_pages(get_cpu_entry_area_index(cpu, tss), + &per_cpu(cpu_tss, cpu), + sizeof(struct tss_struct) / PAGE_SIZE, + PAGE_KERNEL); +#ifdef CONFIG_X86_32 + this_cpu_write(cpu_entry_area, get_cpu_entry_area(cpu)); +#endif } /* Load the original GDT from the per-cpu structure */ @@ -1249,7 +1273,8 @@ void enable_sep_cpu(void) wrmsr(MSR_IA32_SYSENTER_CS, tss->x86_tss.ss1, 0); wrmsr(MSR_IA32_SYSENTER_ESP, - (unsigned long)tss + offsetofend(struct tss_struct, SYSENTER_stack), + (unsigned long)&get_cpu_entry_area(cpu)->tss + + offsetofend(struct tss_struct, SYSENTER_stack), 0); wrmsr(MSR_IA32_SYSENTER_EIP, (unsigned long)entry_SYSENTER_32, 0); @@ -1371,6 +1396,8 @@ static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks /* May not be marked __init: used by software suspend */ void syscall_init(void) { + int cpu = smp_processor_id(); + wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS); wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64); @@ -1384,7 +1411,7 @@ void syscall_init(void) */ wrmsrl_safe(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS); wrmsrl_safe(MSR_IA32_SYSENTER_ESP, - (unsigned long)this_cpu_ptr(&cpu_tss) + + (unsigned long)&get_cpu_entry_area(cpu)->tss + offsetofend(struct tss_struct, SYSENTER_stack)); wrmsrl_safe(MSR_IA32_SYSENTER_EIP, (u64)entry_SYSENTER_compat); #else @@ -1593,11 +1620,13 @@ void cpu_init(void) BUG_ON(me->mm); enter_lazy_tlb(&init_mm, me); + setup_cpu_entry_area(cpu); + /* * Initialize the TSS. Don't bother initializing sp0, as the initial * task never enters user mode. */ - set_tss_desc(cpu, &t->x86_tss); + set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss); load_TR_desc(); load_mm_ldt(&init_mm); @@ -1610,7 +1639,6 @@ void cpu_init(void) if (is_uv_system()) uv_cpu_init(); - setup_cpu_entry_area(cpu); load_fixmap_gdt(cpu); } @@ -1650,11 +1678,13 @@ void cpu_init(void) BUG_ON(curr->mm); enter_lazy_tlb(&init_mm, curr); + setup_cpu_entry_area(cpu); + /* * Initialize the TSS. Don't bother initializing sp0, as the initial * task never enters user mode. */ - set_tss_desc(cpu, &t->x86_tss); + set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss); load_TR_desc(); load_mm_ldt(&init_mm); @@ -1671,7 +1701,6 @@ void cpu_init(void) fpu__init_cpu(); - setup_cpu_entry_area(cpu); load_fixmap_gdt(cpu); } #endif diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 0f4b931e1a02..c1f503673f1e 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -45,7 +45,8 @@ bool in_task_stack(unsigned long *stack, struct task_struct *task, bool in_sysenter_stack(unsigned long *stack, struct stack_info *info) { - struct tss_struct *tss = this_cpu_ptr(&cpu_tss); + int cpu = smp_processor_id(); + struct tss_struct *tss = &get_cpu_entry_area(cpu)->tss; /* Treat the canary as part of the stack for unwinding purposes. */ void *begin = &tss->SYSENTER_stack_canary; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index a7c5a47beab7..d61986a36575 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2280,7 +2280,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) * processors. See 22.2.4. */ vmcs_writel(HOST_TR_BASE, - (unsigned long)this_cpu_ptr(&cpu_tss.x86_tss)); + (unsigned long)&get_cpu_entry_area(cpu)->tss.x86_tss); vmcs_writel(HOST_GDTR_BASE, (unsigned long)gdt); /* 22.2.4 */ /* diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index 48cd87fc7222..2a717e023c9f 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -160,18 +160,19 @@ static void do_fpu_end(void) 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_rw(cpu); tss_desc tss; #endif /* - * This just modifies memory; should not be necessary. But... This is - * necessary, because 386 hardware has concept of busy TSS or some - * similar stupidity. + * We need to reload TR, which requires that we change the + * GDT entry to indicate "available" first. + * + * XXX: This could probably all be replaced by a call to + * force_reload_TR(). */ - set_tss_desc(cpu, &t->x86_tss); + set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss); #ifdef CONFIG_X86_64 memcpy(&tss, &desc[GDT_ENTRY_TSS], sizeof(tss_desc)); diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 0092da1c056f..41e0e103f090 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -948,7 +948,8 @@ ENTRY(debug) movl %esp, %eax # pt_regs pointer /* Are we currently on the SYSENTER stack? */ - PER_CPU(cpu_tss + CPU_TSS_SYSENTER_stack + SIZEOF_SYSENTER_stack, %ecx) + movl PER_CPU_VAR(cpu_entry_area), %ecx + addl $CPU_ENTRY_AREA_tss + CPU_TSS_SYSENTER_stack + SIZEOF_SYSENTER_stack, %ecx subl %eax, %ecx /* ecx = (end of SYSENTER_stack) - esp */ cmpl $SIZEOF_SYSENTER_stack, %ecx jb .Ldebug_from_sysenter_stack @@ -991,7 +992,8 @@ ENTRY(nmi) movl %esp, %eax # pt_regs pointer /* Are we currently on the SYSENTER stack? */ - PER_CPU(cpu_tss + CPU_TSS_SYSENTER_stack + SIZEOF_SYSENTER_stack, %ecx) + movl PER_CPU_VAR(cpu_entry_area), %ecx + addl $CPU_ENTRY_AREA_tss + CPU_TSS_SYSENTER_stack + SIZEOF_SYSENTER_stack, %ecx subl %eax, %ecx /* ecx = (end of SYSENTER_stack) - esp */ cmpl $SIZEOF_SYSENTER_stack, %ecx jb .Lnmi_from_sysenter_stack -- 2.14.2