367 строки
8.2 KiB
C
367 строки
8.2 KiB
C
/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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*/
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#include <linux/kallsyms.h>
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#include <linux/kprobes.h>
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#include <linux/uaccess.h>
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#include <linux/utsname.h>
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#include <linux/hardirq.h>
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#include <linux/kdebug.h>
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/ftrace.h>
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#include <linux/kexec.h>
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#include <linux/bug.h>
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#include <linux/nmi.h>
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#include <linux/sysfs.h>
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#include <asm/stacktrace.h>
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int panic_on_unrecovered_nmi;
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int panic_on_io_nmi;
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unsigned int code_bytes = 64;
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int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
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static int die_counter;
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static void printk_stack_address(unsigned long address, int reliable,
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void *data)
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{
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printk("%s [<%p>] %s%pB\n",
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(char *)data, (void *)address, reliable ? "" : "? ",
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(void *)address);
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}
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void printk_address(unsigned long address)
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{
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pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
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}
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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static void
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print_ftrace_graph_addr(unsigned long addr, void *data,
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const struct stacktrace_ops *ops,
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struct task_struct *task, int *graph)
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{
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unsigned long ret_addr;
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int index;
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if (addr != (unsigned long)return_to_handler)
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return;
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index = task->curr_ret_stack;
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if (!task->ret_stack || index < *graph)
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return;
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index -= *graph;
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ret_addr = task->ret_stack[index].ret;
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ops->address(data, ret_addr, 1);
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(*graph)++;
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}
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#else
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static inline void
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print_ftrace_graph_addr(unsigned long addr, void *data,
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const struct stacktrace_ops *ops,
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struct task_struct *task, int *graph)
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{ }
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#endif
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/*
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* x86-64 can have up to three kernel stacks:
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* process stack
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* interrupt stack
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* severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
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*/
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static inline int valid_stack_ptr(struct task_struct *task,
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void *p, unsigned int size, void *end)
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{
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void *t = task_stack_page(task);
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if (end) {
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if (p < end && p >= (end-THREAD_SIZE))
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return 1;
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else
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return 0;
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}
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return p >= t && p < t + THREAD_SIZE - size;
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}
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unsigned long
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print_context_stack(struct task_struct *task,
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unsigned long *stack, unsigned long bp,
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const struct stacktrace_ops *ops, void *data,
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unsigned long *end, int *graph)
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{
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struct stack_frame *frame = (struct stack_frame *)bp;
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/*
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* If we overflowed the stack into a guard page, jump back to the
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* bottom of the usable stack.
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*/
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if ((unsigned long)task_stack_page(task) - (unsigned long)stack <
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PAGE_SIZE)
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stack = (unsigned long *)task_stack_page(task);
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while (valid_stack_ptr(task, stack, sizeof(*stack), end)) {
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unsigned long addr;
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addr = *stack;
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if (__kernel_text_address(addr)) {
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if ((unsigned long) stack == bp + sizeof(long)) {
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ops->address(data, addr, 1);
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frame = frame->next_frame;
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bp = (unsigned long) frame;
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} else {
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ops->address(data, addr, 0);
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}
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print_ftrace_graph_addr(addr, data, ops, task, graph);
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}
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stack++;
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}
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return bp;
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}
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EXPORT_SYMBOL_GPL(print_context_stack);
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unsigned long
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print_context_stack_bp(struct task_struct *task,
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unsigned long *stack, unsigned long bp,
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const struct stacktrace_ops *ops, void *data,
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unsigned long *end, int *graph)
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{
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struct stack_frame *frame = (struct stack_frame *)bp;
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unsigned long *ret_addr = &frame->return_address;
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while (valid_stack_ptr(task, ret_addr, sizeof(*ret_addr), end)) {
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unsigned long addr = *ret_addr;
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if (!__kernel_text_address(addr))
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break;
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if (ops->address(data, addr, 1))
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break;
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frame = frame->next_frame;
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ret_addr = &frame->return_address;
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print_ftrace_graph_addr(addr, data, ops, task, graph);
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}
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return (unsigned long)frame;
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}
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EXPORT_SYMBOL_GPL(print_context_stack_bp);
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static int print_trace_stack(void *data, char *name)
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{
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printk("%s <%s> ", (char *)data, name);
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return 0;
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}
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/*
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* Print one address/symbol entries per line.
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*/
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static int print_trace_address(void *data, unsigned long addr, int reliable)
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{
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touch_nmi_watchdog();
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printk_stack_address(addr, reliable, data);
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return 0;
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}
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static const struct stacktrace_ops print_trace_ops = {
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.stack = print_trace_stack,
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.address = print_trace_address,
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.walk_stack = print_context_stack,
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};
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void
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show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
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unsigned long *stack, unsigned long bp, char *log_lvl)
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{
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printk("%sCall Trace:\n", log_lvl);
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dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
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}
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void show_trace(struct task_struct *task, struct pt_regs *regs,
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unsigned long *stack, unsigned long bp)
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{
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show_trace_log_lvl(task, regs, stack, bp, "");
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}
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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unsigned long bp = 0;
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unsigned long stack;
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/*
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* Stack frames below this one aren't interesting. Don't show them
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* if we're printing for %current.
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*/
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if (!sp && (!task || task == current)) {
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sp = &stack;
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bp = stack_frame(current, NULL);
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}
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show_stack_log_lvl(task, NULL, sp, bp, "");
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}
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void show_stack_regs(struct pt_regs *regs)
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{
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show_stack_log_lvl(current, regs, (unsigned long *)regs->sp, regs->bp, "");
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}
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static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
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static int die_owner = -1;
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static unsigned int die_nest_count;
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unsigned long oops_begin(void)
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{
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int cpu;
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unsigned long flags;
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oops_enter();
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/* racy, but better than risking deadlock. */
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raw_local_irq_save(flags);
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cpu = smp_processor_id();
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if (!arch_spin_trylock(&die_lock)) {
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if (cpu == die_owner)
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/* nested oops. should stop eventually */;
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else
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arch_spin_lock(&die_lock);
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}
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die_nest_count++;
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die_owner = cpu;
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console_verbose();
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bust_spinlocks(1);
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return flags;
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}
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EXPORT_SYMBOL_GPL(oops_begin);
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NOKPROBE_SYMBOL(oops_begin);
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void __noreturn rewind_stack_do_exit(int signr);
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void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
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{
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if (regs && kexec_should_crash(current))
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crash_kexec(regs);
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bust_spinlocks(0);
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die_owner = -1;
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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die_nest_count--;
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if (!die_nest_count)
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/* Nest count reaches zero, release the lock. */
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arch_spin_unlock(&die_lock);
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raw_local_irq_restore(flags);
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oops_exit();
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if (!signr)
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return;
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if (in_interrupt())
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panic("Fatal exception in interrupt");
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if (panic_on_oops)
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panic("Fatal exception");
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/*
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* We're not going to return, but we might be on an IST stack or
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* have very little stack space left. Rewind the stack and kill
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* the task.
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*/
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rewind_stack_do_exit(signr);
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}
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NOKPROBE_SYMBOL(oops_end);
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int __die(const char *str, struct pt_regs *regs, long err)
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{
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#ifdef CONFIG_X86_32
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unsigned short ss;
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unsigned long sp;
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#endif
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printk(KERN_DEFAULT
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"%s: %04lx [#%d]%s%s%s%s\n", str, err & 0xffff, ++die_counter,
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IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
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IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
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debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
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IS_ENABLED(CONFIG_KASAN) ? " KASAN" : "");
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if (notify_die(DIE_OOPS, str, regs, err,
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current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
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return 1;
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print_modules();
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show_regs(regs);
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#ifdef CONFIG_X86_32
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if (user_mode(regs)) {
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sp = regs->sp;
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ss = regs->ss & 0xffff;
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} else {
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sp = kernel_stack_pointer(regs);
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savesegment(ss, ss);
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}
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printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
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print_symbol("%s", regs->ip);
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printk(" SS:ESP %04x:%08lx\n", ss, sp);
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#else
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/* Executive summary in case the oops scrolled away */
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printk(KERN_ALERT "RIP ");
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printk_address(regs->ip);
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printk(" RSP <%016lx>\n", regs->sp);
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#endif
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return 0;
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}
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NOKPROBE_SYMBOL(__die);
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/*
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* This is gone through when something in the kernel has done something bad
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* and is about to be terminated:
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*/
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void die(const char *str, struct pt_regs *regs, long err)
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{
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unsigned long flags = oops_begin();
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int sig = SIGSEGV;
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if (!user_mode(regs))
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report_bug(regs->ip, regs);
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if (__die(str, regs, err))
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sig = 0;
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oops_end(flags, regs, sig);
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}
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static int __init kstack_setup(char *s)
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{
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ssize_t ret;
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unsigned long val;
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if (!s)
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return -EINVAL;
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ret = kstrtoul(s, 0, &val);
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if (ret)
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return ret;
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kstack_depth_to_print = val;
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return 0;
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}
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early_param("kstack", kstack_setup);
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static int __init code_bytes_setup(char *s)
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{
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ssize_t ret;
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unsigned long val;
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if (!s)
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return -EINVAL;
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ret = kstrtoul(s, 0, &val);
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if (ret)
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return ret;
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code_bytes = val;
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if (code_bytes > 8192)
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code_bytes = 8192;
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return 1;
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}
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__setup("code_bytes=", code_bytes_setup);
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