diff options
| -rw-r--r-- | Documentation/x86/kernel-stacks | 8 | ||||
| -rw-r--r-- | arch/x86/entry/entry_64.S | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/page_64_types.h | 13 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/dumpstack_64.c | 14 | ||||
| -rw-r--r-- | arch/x86/kernel/idt.c | 15 | ||||
| -rw-r--r-- | arch/x86/kernel/irq_64.c | 2 | ||||
| -rw-r--r-- | arch/x86/mm/fault.c | 2 |
8 files changed, 34 insertions, 28 deletions
diff --git a/Documentation/x86/kernel-stacks b/Documentation/x86/kernel-stacks index 9a0aa4d3a866..1b04596caea9 100644 --- a/Documentation/x86/kernel-stacks +++ b/Documentation/x86/kernel-stacks @@ -59,7 +59,7 @@ If that assumption is ever broken then the stacks will become corrupt. The currently assigned IST stacks are :- -* DOUBLEFAULT_STACK. EXCEPTION_STKSZ (PAGE_SIZE). +* ESTACK_DF. EXCEPTION_STKSZ (PAGE_SIZE). Used for interrupt 8 - Double Fault Exception (#DF). @@ -68,7 +68,7 @@ The currently assigned IST stacks are :- Using a separate stack allows the kernel to recover from it well enough in many cases to still output an oops. -* NMI_STACK. EXCEPTION_STKSZ (PAGE_SIZE). +* ESTACK_NMI. EXCEPTION_STKSZ (PAGE_SIZE). Used for non-maskable interrupts (NMI). @@ -76,7 +76,7 @@ The currently assigned IST stacks are :- middle of switching stacks. Using IST for NMI events avoids making assumptions about the previous state of the kernel stack. -* DEBUG_STACK. DEBUG_STKSZ +* ESTACK_DB. DEBUG_STKSZ Used for hardware debug interrupts (interrupt 1) and for software debug interrupts (INT3). @@ -86,7 +86,7 @@ The currently assigned IST stacks are :- avoids making assumptions about the previous state of the kernel stack. -* MCE_STACK. EXCEPTION_STKSZ (PAGE_SIZE). +* ESTACK_MCE. EXCEPTION_STKSZ (PAGE_SIZE). Used for interrupt 18 - Machine Check Exception (#MC). diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 1f0efdb7b629..fd0a50452cb3 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -841,7 +841,7 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt /* * Exception entry points. */ -#define CPU_TSS_IST(x) PER_CPU_VAR(cpu_tss_rw) + (TSS_ist + ((x) - 1) * 8) +#define CPU_TSS_IST(x) PER_CPU_VAR(cpu_tss_rw) + (TSS_ist + (x) * 8) /** * idtentry - Generate an IDT entry stub @@ -1129,7 +1129,7 @@ apicinterrupt3 HYPERV_STIMER0_VECTOR \ hv_stimer0_callback_vector hv_stimer0_vector_handler #endif /* CONFIG_HYPERV */ -idtentry debug do_debug has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK +idtentry debug do_debug has_error_code=0 paranoid=1 shift_ist=ESTACK_DB idtentry int3 do_int3 has_error_code=0 idtentry stack_segment do_stack_segment has_error_code=1 diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h index bcd8c0518604..6ab2c54c1bf9 100644 --- a/arch/x86/include/asm/page_64_types.h +++ b/arch/x86/include/asm/page_64_types.h @@ -24,11 +24,14 @@ #define IRQ_STACK_ORDER (2 + KASAN_STACK_ORDER) #define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER) -#define DOUBLEFAULT_STACK 1 -#define NMI_STACK 2 -#define DEBUG_STACK 3 -#define MCE_STACK 4 -#define N_EXCEPTION_STACKS 4 /* hw limit: 7 */ +/* + * The index for the tss.ist[] array. The hardware limit is 7 entries. + */ +#define ESTACK_DF 0 +#define ESTACK_NMI 1 +#define ESTACK_DB 2 +#define ESTACK_MCE 3 +#define N_EXCEPTION_STACKS 4 /* * Set __PAGE_OFFSET to the most negative possible address + diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index cb28e98a0659..0e4cb718fc4a 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -516,7 +516,7 @@ DEFINE_PER_CPU(struct cpu_entry_area *, cpu_entry_area); */ static const unsigned int exception_stack_sizes[N_EXCEPTION_STACKS] = { [0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STKSZ, - [DEBUG_STACK - 1] = DEBUG_STKSZ + [ESTACK_DB] = DEBUG_STKSZ }; #endif @@ -1760,7 +1760,7 @@ void cpu_init(void) estacks += exception_stack_sizes[v]; oist->ist[v] = t->x86_tss.ist[v] = (unsigned long)estacks; - if (v == DEBUG_STACK-1) + if (v == ESTACK_DB) per_cpu(debug_stack_addr, cpu) = (unsigned long)estacks; } } diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c index 90f0fa88cbb3..455b47ef9250 100644 --- a/arch/x86/kernel/dumpstack_64.c +++ b/arch/x86/kernel/dumpstack_64.c @@ -18,16 +18,16 @@ #include <asm/stacktrace.h> -static char *exception_stack_names[N_EXCEPTION_STACKS] = { - [ DOUBLEFAULT_STACK-1 ] = "#DF", - [ NMI_STACK-1 ] = "NMI", - [ DEBUG_STACK-1 ] = "#DB", - [ MCE_STACK-1 ] = "#MC", +static const char *exception_stack_names[N_EXCEPTION_STACKS] = { + [ ESTACK_DF ] = "#DF", + [ ESTACK_NMI ] = "NMI", + [ ESTACK_DB ] = "#DB", + [ ESTACK_MCE ] = "#MC", }; -static unsigned long exception_stack_sizes[N_EXCEPTION_STACKS] = { +static const unsigned long exception_stack_sizes[N_EXCEPTION_STACKS] = { [0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STKSZ, - [DEBUG_STACK - 1] = DEBUG_STKSZ + [ESTACK_DB] = DEBUG_STKSZ }; const char *stack_type_name(enum stack_type type) diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c index 2877606e97de..2188f734ec61 100644 --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -41,9 +41,12 @@ struct idt_data { #define SYSG(_vector, _addr) \ G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS) -/* Interrupt gate with interrupt stack */ +/* + * Interrupt gate with interrupt stack. The _ist index is the index in + * the tss.ist[] array, but for the descriptor it needs to start at 1. + */ #define ISTG(_vector, _addr, _ist) \ - G(_vector, _addr, _ist, GATE_INTERRUPT, DPL0, __KERNEL_CS) + G(_vector, _addr, _ist + 1, GATE_INTERRUPT, DPL0, __KERNEL_CS) /* Task gate */ #define TSKG(_vector, _gdt) \ @@ -180,11 +183,11 @@ gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss; * cpu_init() when the TSS has been initialized. */ static const __initconst struct idt_data ist_idts[] = { - ISTG(X86_TRAP_DB, debug, DEBUG_STACK), - ISTG(X86_TRAP_NMI, nmi, NMI_STACK), - ISTG(X86_TRAP_DF, double_fault, DOUBLEFAULT_STACK), + ISTG(X86_TRAP_DB, debug, ESTACK_DB), + ISTG(X86_TRAP_NMI, nmi, ESTACK_NMI), + ISTG(X86_TRAP_DF, double_fault, ESTACK_DF), #ifdef CONFIG_X86_MCE - ISTG(X86_TRAP_MC, &machine_check, MCE_STACK), + ISTG(X86_TRAP_MC, &machine_check, ESTACK_MCE), #endif }; diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c index cf200466d5c8..182e8b245e06 100644 --- a/arch/x86/kernel/irq_64.c +++ b/arch/x86/kernel/irq_64.c @@ -61,7 +61,7 @@ static inline void stack_overflow_check(struct pt_regs *regs) return; oist = this_cpu_ptr(&orig_ist); - estack_top = (u64)oist->ist[DEBUG_STACK]; + estack_top = (u64)oist->ist[ESTACK_DB]; estack_bottom = estack_top - DEBUG_STKSZ + STACK_MARGIN; if (regs->sp >= estack_bottom && regs->sp <= estack_top) return; diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 667f1da36208..0524e1d74f24 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -793,7 +793,7 @@ no_context(struct pt_regs *regs, unsigned long error_code, if (is_vmalloc_addr((void *)address) && (((unsigned long)tsk->stack - 1 - address < PAGE_SIZE) || address - ((unsigned long)tsk->stack + THREAD_SIZE) < PAGE_SIZE)) { - unsigned long stack = this_cpu_read(orig_ist.ist[DOUBLEFAULT_STACK]) - sizeof(void *); + unsigned long stack = this_cpu_read(orig_ist.ist[ESTACK_DF]) - sizeof(void *); /* * We're likely to be running with very little stack space * left. It's plausible that we'd hit this condition but |