Release 4.14 arch/x86/kernel/irq_64.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
*
* This file contains the lowest level x86_64-specific interrupt
* entry and irq statistics code. All the remaining irq logic is
* done by the generic kernel/irq/ code and in the
* x86_64-specific irq controller code. (e.g. i8259.c and
* io_apic.c.)
*/
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/ftrace.h>
#include <linux/uaccess.h>
#include <linux/smp.h>
#include <linux/sched/task_stack.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
int sysctl_panic_on_stackoverflow;
/*
* Probabilistic stack overflow check:
*
* Only check the stack in process context, because everything else
* runs on the big interrupt stacks. Checking reliably is too expensive,
* so we just check from interrupts.
*/
static inline void stack_overflow_check(struct pt_regs *regs)
{
#ifdef CONFIG_DEBUG_STACKOVERFLOW
#define STACK_TOP_MARGIN 128
struct orig_ist *oist;
u64 irq_stack_top, irq_stack_bottom;
u64 estack_top, estack_bottom;
u64 curbase = (u64)task_stack_page(current);
if (user_mode(regs))
return;
if (regs->sp >= curbase + sizeof(struct pt_regs) + STACK_TOP_MARGIN &&
regs->sp <= curbase + THREAD_SIZE)
return;
irq_stack_top = (u64)this_cpu_ptr(irq_stack_union.irq_stack) +
STACK_TOP_MARGIN;
irq_stack_bottom = (u64)__this_cpu_read(irq_stack_ptr);
if (regs->sp >= irq_stack_top && regs->sp <= irq_stack_bottom)
return;
oist = this_cpu_ptr(&orig_ist);
estack_top = (u64)oist->ist[0] - EXCEPTION_STKSZ + STACK_TOP_MARGIN;
estack_bottom = (u64)oist->ist[N_EXCEPTION_STACKS - 1];
if (regs->sp >= estack_top && regs->sp <= estack_bottom)
return;
WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx)\n",
current->comm, curbase, regs->sp,
irq_stack_top, irq_stack_bottom,
estack_top, estack_bottom);
if (sysctl_panic_on_stackoverflow)
panic("low stack detected by irq handler - check messages\n");
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mitsuo Hayasaka | 148 | 71.84% | 5 | 41.67% |
| Eric Sandeen | 41 | 19.90% | 1 | 8.33% |
| Ingo Molnar | 4 | 1.94% | 1 | 8.33% |
| Christoph Lameter | 4 | 1.94% | 1 | 8.33% |
| jia zhang | 3 | 1.46% | 1 | 8.33% |
| Roman Zippel | 3 | 1.46% | 1 | 8.33% |
| H. Peter Anvin | 2 | 0.97% | 1 | 8.33% |
| Andrew Lutomirski | 1 | 0.49% | 1 | 8.33% |
| Total | 206 | 100.00% | 12 | 100.00% |
bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
{
stack_overflow_check(regs);
if (IS_ERR_OR_NULL(desc))
return false;
generic_handle_irq_desc(desc);
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Fitzhardinge | 32 | 84.21% | 1 | 50.00% |
| Thomas Gleixner | 6 | 15.79% | 1 | 50.00% |
| Total | 38 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mitsuo Hayasaka | 151 | 53.93% | 5 | 20.00% |
| Eric Sandeen | 42 | 15.00% | 1 | 4.00% |
| Jeremy Fitzhardinge | 32 | 11.43% | 1 | 4.00% |
| Andi Kleen | 14 | 5.00% | 2 | 8.00% |
| Ingo Molnar | 8 | 2.86% | 3 | 12.00% |
| Thomas Gleixner | 6 | 2.14% | 1 | 4.00% |
| Christoph Lameter | 4 | 1.43% | 1 | 4.00% |
| Ashok Raj | 3 | 1.07% | 1 | 4.00% |
| Frédéric Weisbecker | 3 | 1.07% | 1 | 4.00% |
| Roman Zippel | 3 | 1.07% | 1 | 4.00% |
| Jaswinder Singh Rajput | 3 | 1.07% | 1 | 4.00% |
| jia zhang | 3 | 1.07% | 1 | 4.00% |
| Eric W. Biedermann | 2 | 0.71% | 1 | 4.00% |
| H. Peter Anvin | 2 | 0.71% | 1 | 4.00% |
| Greg Kroah-Hartman | 1 | 0.36% | 1 | 4.00% |
| Brian Gerst | 1 | 0.36% | 1 | 4.00% |
| Andrew Lutomirski | 1 | 0.36% | 1 | 4.00% |
| Dave Jones | 1 | 0.36% | 1 | 4.00% |
| Total | 280 | 100.00% | 25 | 100.00% |
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