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x86/exceptions: Make IST index zero based 

The defines for the exception stack (IST) array in the TSS are using the
SDM convention IST1 - IST7. That causes all sorts of code to subtract 1 for
array indices related to IST. That's confusing at best and does not provide
any value.

Make the indices zero based and fixup the usage sites. The only code which
needs to adjust the 0 based index is the interrupt descriptor setup which
needs to add 1 now.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: linux-doc@vger.kernel.org
Cc: Nicolai Stange <nstange@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Qian Cai <cai@lca.pw>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160144.331772825@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-04-14 17:59:45 +02:00 committed by Borislav Petkov
parent 3084221150
commit 8f34c5b5af
8 changed files with 34 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/x86/kernel-stacks
View File

@ -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).

4
arch/x86/entry/entry_64.S
View File

@ -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

13
arch/x86/include/asm/page_64_types.h
View File

@ -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 +

4
arch/x86/kernel/cpu/common.c
View File

@ -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;
}
}

14
arch/x86/kernel/dumpstack_64.c
View File

@ -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)

15
arch/x86/kernel/idt.c
View File

@ -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
};

2
arch/x86/kernel/irq_64.c
View File

@ -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;

2
arch/x86/mm/fault.c
View File

@ -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