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1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 */
5#include <linux/kallsyms.h>
6#include <linux/kprobes.h>
7#include <linux/uaccess.h>
8#include <linux/utsname.h>
9#include <linux/hardirq.h>
10#include <linux/kdebug.h>
11#include <linux/module.h>
12#include <linux/ptrace.h>
13#include <linux/ftrace.h>
14#include <linux/kexec.h>
15#include <linux/bug.h>
16#include <linux/nmi.h>
17#include <linux/sysfs.h>
18
19#include <asm/stacktrace.h>
20
21
22int panic_on_unrecovered_nmi;
23int panic_on_io_nmi;
24unsigned int code_bytes = 64;
25int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
26static int die_counter;
27
28void printk_address(unsigned long address, int reliable)
29{
30 printk(" [<%p>] %s%pB\n", (void *) address,
31 reliable ? "" : "? ", (void *) address);
32}
33
34#ifdef CONFIG_FUNCTION_GRAPH_TRACER
35static void
36print_ftrace_graph_addr(unsigned long addr, void *data,
37 const struct stacktrace_ops *ops,
38 struct thread_info *tinfo, int *graph)
39{
40 struct task_struct *task;
41 unsigned long ret_addr;
42 int index;
43
44 if (addr != (unsigned long)return_to_handler)
45 return;
46
47 task = tinfo->task;
48 index = task->curr_ret_stack;
49
50 if (!task->ret_stack || index < *graph)
51 return;
52
53 index -= *graph;
54 ret_addr = task->ret_stack[index].ret;
55
56 ops->address(data, ret_addr, 1);
57
58 (*graph)++;
59}
60#else
61static inline void
62print_ftrace_graph_addr(unsigned long addr, void *data,
63 const struct stacktrace_ops *ops,
64 struct thread_info *tinfo, int *graph)
65{ }
66#endif
67
68/*
69 * x86-64 can have up to three kernel stacks:
70 * process stack
71 * interrupt stack
72 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
73 */
74
75static inline int valid_stack_ptr(struct thread_info *tinfo,
76 void *p, unsigned int size, void *end)
77{
78 void *t = tinfo;
79 if (end) {
80 if (p < end && p >= (end-THREAD_SIZE))
81 return 1;
82 else
83 return 0;
84 }
85 return p > t && p < t + THREAD_SIZE - size;
86}
87
88unsigned long
89print_context_stack(struct thread_info *tinfo,
90 unsigned long *stack, unsigned long bp,
91 const struct stacktrace_ops *ops, void *data,
92 unsigned long *end, int *graph)
93{
94 struct stack_frame *frame = (struct stack_frame *)bp;
95
96 while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
97 unsigned long addr;
98
99 addr = *stack;
100 if (__kernel_text_address(addr)) {
101 if ((unsigned long) stack == bp + sizeof(long)) {
102 ops->address(data, addr, 1);
103 frame = frame->next_frame;
104 bp = (unsigned long) frame;
105 } else {
106 ops->address(data, addr, 0);
107 }
108 print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
109 }
110 stack++;
111 }
112 return bp;
113}
114EXPORT_SYMBOL_GPL(print_context_stack);
115
116unsigned long
117print_context_stack_bp(struct thread_info *tinfo,
118 unsigned long *stack, unsigned long bp,
119 const struct stacktrace_ops *ops, void *data,
120 unsigned long *end, int *graph)
121{
122 struct stack_frame *frame = (struct stack_frame *)bp;
123 unsigned long *ret_addr = &frame->return_address;
124
125 while (valid_stack_ptr(tinfo, ret_addr, sizeof(*ret_addr), end)) {
126 unsigned long addr = *ret_addr;
127
128 if (!__kernel_text_address(addr))
129 break;
130
131 ops->address(data, addr, 1);
132 frame = frame->next_frame;
133 ret_addr = &frame->return_address;
134 print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
135 }
136
137 return (unsigned long)frame;
138}
139EXPORT_SYMBOL_GPL(print_context_stack_bp);
140
141static int print_trace_stack(void *data, char *name)
142{
143 printk("%s <%s> ", (char *)data, name);
144 return 0;
145}
146
147/*
148 * Print one address/symbol entries per line.
149 */
150static void print_trace_address(void *data, unsigned long addr, int reliable)
151{
152 touch_nmi_watchdog();
153 printk(data);
154 printk_address(addr, reliable);
155}
156
157static const struct stacktrace_ops print_trace_ops = {
158 .stack = print_trace_stack,
159 .address = print_trace_address,
160 .walk_stack = print_context_stack,
161};
162
163void
164show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
165 unsigned long *stack, unsigned long bp, char *log_lvl)
166{
167 printk("%sCall Trace:\n", log_lvl);
168 dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
169}
170
171void show_trace(struct task_struct *task, struct pt_regs *regs,
172 unsigned long *stack, unsigned long bp)
173{
174 show_trace_log_lvl(task, regs, stack, bp, "");
175}
176
177void show_stack(struct task_struct *task, unsigned long *sp)
178{
179 show_stack_log_lvl(task, NULL, sp, 0, "");
180}
181
182/*
183 * The architecture-independent dump_stack generator
184 */
185void dump_stack(void)
186{
187 unsigned long bp;
188 unsigned long stack;
189
190 bp = stack_frame(current, NULL);
191 printk("Pid: %d, comm: %.20s %s %s %.*s\n",
192 current->pid, current->comm, print_tainted(),
193 init_utsname()->release,
194 (int)strcspn(init_utsname()->version, " "),
195 init_utsname()->version);
196 show_trace(NULL, NULL, &stack, bp);
197}
198EXPORT_SYMBOL(dump_stack);
199
200static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
201static int die_owner = -1;
202static unsigned int die_nest_count;
203
204unsigned __kprobes long oops_begin(void)
205{
206 int cpu;
207 unsigned long flags;
208
209 oops_enter();
210
211 /* racy, but better than risking deadlock. */
212 raw_local_irq_save(flags);
213 cpu = smp_processor_id();
214 if (!arch_spin_trylock(&die_lock)) {
215 if (cpu == die_owner)
216 /* nested oops. should stop eventually */;
217 else
218 arch_spin_lock(&die_lock);
219 }
220 die_nest_count++;
221 die_owner = cpu;
222 console_verbose();
223 bust_spinlocks(1);
224 return flags;
225}
226EXPORT_SYMBOL_GPL(oops_begin);
227
228void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
229{
230 if (regs && kexec_should_crash(current))
231 crash_kexec(regs);
232
233 bust_spinlocks(0);
234 die_owner = -1;
235 add_taint(TAINT_DIE);
236 die_nest_count--;
237 if (!die_nest_count)
238 /* Nest count reaches zero, release the lock. */
239 arch_spin_unlock(&die_lock);
240 raw_local_irq_restore(flags);
241 oops_exit();
242
243 if (!signr)
244 return;
245 if (in_interrupt())
246 panic("Fatal exception in interrupt");
247 if (panic_on_oops)
248 panic("Fatal exception");
249 do_exit(signr);
250}
251
252int __kprobes __die(const char *str, struct pt_regs *regs, long err)
253{
254#ifdef CONFIG_X86_32
255 unsigned short ss;
256 unsigned long sp;
257#endif
258 printk(KERN_DEFAULT
259 "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
260#ifdef CONFIG_PREEMPT
261 printk("PREEMPT ");
262#endif
263#ifdef CONFIG_SMP
264 printk("SMP ");
265#endif
266#ifdef CONFIG_DEBUG_PAGEALLOC
267 printk("DEBUG_PAGEALLOC");
268#endif
269 printk("\n");
270 if (notify_die(DIE_OOPS, str, regs, err,
271 current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
272 return 1;
273
274 show_regs(regs);
275#ifdef CONFIG_X86_32
276 if (user_mode_vm(regs)) {
277 sp = regs->sp;
278 ss = regs->ss & 0xffff;
279 } else {
280 sp = kernel_stack_pointer(regs);
281 savesegment(ss, ss);
282 }
283 printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
284 print_symbol("%s", regs->ip);
285 printk(" SS:ESP %04x:%08lx\n", ss, sp);
286#else
287 /* Executive summary in case the oops scrolled away */
288 printk(KERN_ALERT "RIP ");
289 printk_address(regs->ip, 1);
290 printk(" RSP <%016lx>\n", regs->sp);
291#endif
292 return 0;
293}
294
295/*
296 * This is gone through when something in the kernel has done something bad
297 * and is about to be terminated:
298 */
299void die(const char *str, struct pt_regs *regs, long err)
300{
301 unsigned long flags = oops_begin();
302 int sig = SIGSEGV;
303
304 if (!user_mode_vm(regs))
305 report_bug(regs->ip, regs);
306
307 if (__die(str, regs, err))
308 sig = 0;
309 oops_end(flags, regs, sig);
310}
311
312static int __init kstack_setup(char *s)
313{
314 ssize_t ret;
315 unsigned long val;
316
317 if (!s)
318 return -EINVAL;
319
320 ret = kstrtoul(s, 0, &val);
321 if (ret)
322 return ret;
323 kstack_depth_to_print = val;
324 return 0;
325}
326early_param("kstack", kstack_setup);
327
328static int __init code_bytes_setup(char *s)
329{
330 ssize_t ret;
331 unsigned long val;
332
333 if (!s)
334 return -EINVAL;
335
336 ret = kstrtoul(s, 0, &val);
337 if (ret)
338 return ret;
339
340 code_bytes = val;
341 if (code_bytes > 8192)
342 code_bytes = 8192;
343
344 return 1;
345}
346__setup("code_bytes=", code_bytes_setup);
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 */
5#include <linux/kallsyms.h>
6#include <linux/kprobes.h>
7#include <linux/uaccess.h>
8#include <linux/utsname.h>
9#include <linux/hardirq.h>
10#include <linux/kdebug.h>
11#include <linux/module.h>
12#include <linux/ptrace.h>
13#include <linux/ftrace.h>
14#include <linux/kexec.h>
15#include <linux/bug.h>
16#include <linux/nmi.h>
17#include <linux/sysfs.h>
18
19#include <asm/stacktrace.h>
20
21
22int panic_on_unrecovered_nmi;
23int panic_on_io_nmi;
24unsigned int code_bytes = 64;
25int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
26static int die_counter;
27
28static void printk_stack_address(unsigned long address, int reliable,
29 void *data)
30{
31 printk("%s [<%p>] %s%pB\n",
32 (char *)data, (void *)address, reliable ? "" : "? ",
33 (void *)address);
34}
35
36void printk_address(unsigned long address)
37{
38 pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
39}
40
41#ifdef CONFIG_FUNCTION_GRAPH_TRACER
42static void
43print_ftrace_graph_addr(unsigned long addr, void *data,
44 const struct stacktrace_ops *ops,
45 struct thread_info *tinfo, int *graph)
46{
47 struct task_struct *task;
48 unsigned long ret_addr;
49 int index;
50
51 if (addr != (unsigned long)return_to_handler)
52 return;
53
54 task = tinfo->task;
55 index = task->curr_ret_stack;
56
57 if (!task->ret_stack || index < *graph)
58 return;
59
60 index -= *graph;
61 ret_addr = task->ret_stack[index].ret;
62
63 ops->address(data, ret_addr, 1);
64
65 (*graph)++;
66}
67#else
68static inline void
69print_ftrace_graph_addr(unsigned long addr, void *data,
70 const struct stacktrace_ops *ops,
71 struct thread_info *tinfo, int *graph)
72{ }
73#endif
74
75/*
76 * x86-64 can have up to three kernel stacks:
77 * process stack
78 * interrupt stack
79 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
80 */
81
82static inline int valid_stack_ptr(struct thread_info *tinfo,
83 void *p, unsigned int size, void *end)
84{
85 void *t = tinfo;
86 if (end) {
87 if (p < end && p >= (end-THREAD_SIZE))
88 return 1;
89 else
90 return 0;
91 }
92 return p > t && p < t + THREAD_SIZE - size;
93}
94
95unsigned long
96print_context_stack(struct thread_info *tinfo,
97 unsigned long *stack, unsigned long bp,
98 const struct stacktrace_ops *ops, void *data,
99 unsigned long *end, int *graph)
100{
101 struct stack_frame *frame = (struct stack_frame *)bp;
102
103 while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
104 unsigned long addr;
105
106 addr = *stack;
107 if (__kernel_text_address(addr)) {
108 if ((unsigned long) stack == bp + sizeof(long)) {
109 ops->address(data, addr, 1);
110 frame = frame->next_frame;
111 bp = (unsigned long) frame;
112 } else {
113 ops->address(data, addr, 0);
114 }
115 print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
116 }
117 stack++;
118 }
119 return bp;
120}
121EXPORT_SYMBOL_GPL(print_context_stack);
122
123unsigned long
124print_context_stack_bp(struct thread_info *tinfo,
125 unsigned long *stack, unsigned long bp,
126 const struct stacktrace_ops *ops, void *data,
127 unsigned long *end, int *graph)
128{
129 struct stack_frame *frame = (struct stack_frame *)bp;
130 unsigned long *ret_addr = &frame->return_address;
131
132 while (valid_stack_ptr(tinfo, ret_addr, sizeof(*ret_addr), end)) {
133 unsigned long addr = *ret_addr;
134
135 if (!__kernel_text_address(addr))
136 break;
137
138 if (ops->address(data, addr, 1))
139 break;
140 frame = frame->next_frame;
141 ret_addr = &frame->return_address;
142 print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
143 }
144
145 return (unsigned long)frame;
146}
147EXPORT_SYMBOL_GPL(print_context_stack_bp);
148
149static int print_trace_stack(void *data, char *name)
150{
151 printk("%s <%s> ", (char *)data, name);
152 return 0;
153}
154
155/*
156 * Print one address/symbol entries per line.
157 */
158static int print_trace_address(void *data, unsigned long addr, int reliable)
159{
160 touch_nmi_watchdog();
161 printk_stack_address(addr, reliable, data);
162 return 0;
163}
164
165static const struct stacktrace_ops print_trace_ops = {
166 .stack = print_trace_stack,
167 .address = print_trace_address,
168 .walk_stack = print_context_stack,
169};
170
171void
172show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
173 unsigned long *stack, unsigned long bp, char *log_lvl)
174{
175 printk("%sCall Trace:\n", log_lvl);
176 dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
177}
178
179void show_trace(struct task_struct *task, struct pt_regs *regs,
180 unsigned long *stack, unsigned long bp)
181{
182 show_trace_log_lvl(task, regs, stack, bp, "");
183}
184
185void show_stack(struct task_struct *task, unsigned long *sp)
186{
187 unsigned long bp = 0;
188 unsigned long stack;
189
190 /*
191 * Stack frames below this one aren't interesting. Don't show them
192 * if we're printing for %current.
193 */
194 if (!sp && (!task || task == current)) {
195 sp = &stack;
196 bp = stack_frame(current, NULL);
197 }
198
199 show_stack_log_lvl(task, NULL, sp, bp, "");
200}
201
202static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
203static int die_owner = -1;
204static unsigned int die_nest_count;
205
206unsigned long oops_begin(void)
207{
208 int cpu;
209 unsigned long flags;
210
211 oops_enter();
212
213 /* racy, but better than risking deadlock. */
214 raw_local_irq_save(flags);
215 cpu = smp_processor_id();
216 if (!arch_spin_trylock(&die_lock)) {
217 if (cpu == die_owner)
218 /* nested oops. should stop eventually */;
219 else
220 arch_spin_lock(&die_lock);
221 }
222 die_nest_count++;
223 die_owner = cpu;
224 console_verbose();
225 bust_spinlocks(1);
226 return flags;
227}
228EXPORT_SYMBOL_GPL(oops_begin);
229NOKPROBE_SYMBOL(oops_begin);
230
231void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
232{
233 if (regs && kexec_should_crash(current))
234 crash_kexec(regs);
235
236 bust_spinlocks(0);
237 die_owner = -1;
238 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
239 die_nest_count--;
240 if (!die_nest_count)
241 /* Nest count reaches zero, release the lock. */
242 arch_spin_unlock(&die_lock);
243 raw_local_irq_restore(flags);
244 oops_exit();
245
246 if (!signr)
247 return;
248 if (in_interrupt())
249 panic("Fatal exception in interrupt");
250 if (panic_on_oops)
251 panic("Fatal exception");
252 do_exit(signr);
253}
254NOKPROBE_SYMBOL(oops_end);
255
256int __die(const char *str, struct pt_regs *regs, long err)
257{
258#ifdef CONFIG_X86_32
259 unsigned short ss;
260 unsigned long sp;
261#endif
262 printk(KERN_DEFAULT
263 "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
264#ifdef CONFIG_PREEMPT
265 printk("PREEMPT ");
266#endif
267#ifdef CONFIG_SMP
268 printk("SMP ");
269#endif
270 if (debug_pagealloc_enabled())
271 printk("DEBUG_PAGEALLOC ");
272#ifdef CONFIG_KASAN
273 printk("KASAN");
274#endif
275 printk("\n");
276 if (notify_die(DIE_OOPS, str, regs, err,
277 current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
278 return 1;
279
280 print_modules();
281 show_regs(regs);
282#ifdef CONFIG_X86_32
283 if (user_mode(regs)) {
284 sp = regs->sp;
285 ss = regs->ss & 0xffff;
286 } else {
287 sp = kernel_stack_pointer(regs);
288 savesegment(ss, ss);
289 }
290 printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
291 print_symbol("%s", regs->ip);
292 printk(" SS:ESP %04x:%08lx\n", ss, sp);
293#else
294 /* Executive summary in case the oops scrolled away */
295 printk(KERN_ALERT "RIP ");
296 printk_address(regs->ip);
297 printk(" RSP <%016lx>\n", regs->sp);
298#endif
299 return 0;
300}
301NOKPROBE_SYMBOL(__die);
302
303/*
304 * This is gone through when something in the kernel has done something bad
305 * and is about to be terminated:
306 */
307void die(const char *str, struct pt_regs *regs, long err)
308{
309 unsigned long flags = oops_begin();
310 int sig = SIGSEGV;
311
312 if (!user_mode(regs))
313 report_bug(regs->ip, regs);
314
315 if (__die(str, regs, err))
316 sig = 0;
317 oops_end(flags, regs, sig);
318}
319
320static int __init kstack_setup(char *s)
321{
322 ssize_t ret;
323 unsigned long val;
324
325 if (!s)
326 return -EINVAL;
327
328 ret = kstrtoul(s, 0, &val);
329 if (ret)
330 return ret;
331 kstack_depth_to_print = val;
332 return 0;
333}
334early_param("kstack", kstack_setup);
335
336static int __init code_bytes_setup(char *s)
337{
338 ssize_t ret;
339 unsigned long val;
340
341 if (!s)
342 return -EINVAL;
343
344 ret = kstrtoul(s, 0, &val);
345 if (ret)
346 return ret;
347
348 code_bytes = val;
349 if (code_bytes > 8192)
350 code_bytes = 8192;
351
352 return 1;
353}
354__setup("code_bytes=", code_bytes_setup);