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-rw-r--r--arch/x86/kernel/dumpstack.c479
1 files changed, 479 insertions, 0 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
new file mode 100644
index 000000000..f18ca44c9
--- /dev/null
+++ b/arch/x86/kernel/dumpstack.c
@@ -0,0 +1,479 @@
+/*
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
+ */
+#include <linux/kallsyms.h>
+#include <linux/kprobes.h>
+#include <linux/uaccess.h>
+#include <linux/utsname.h>
+#include <linux/hardirq.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
+#include <linux/ptrace.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/ftrace.h>
+#include <linux/kexec.h>
+#include <linux/bug.h>
+#include <linux/nmi.h>
+#include <linux/sysfs.h>
+#include <linux/kasan.h>
+
+#include <asm/cpu_entry_area.h>
+#include <asm/stacktrace.h>
+#include <asm/unwind.h>
+
+int panic_on_unrecovered_nmi;
+int panic_on_io_nmi;
+static int die_counter;
+
+static struct pt_regs exec_summary_regs;
+
+bool noinstr in_task_stack(unsigned long *stack, struct task_struct *task,
+ struct stack_info *info)
+{
+ unsigned long *begin = task_stack_page(task);
+ unsigned long *end = task_stack_page(task) + THREAD_SIZE;
+
+ if (stack < begin || stack >= end)
+ return false;
+
+ info->type = STACK_TYPE_TASK;
+ info->begin = begin;
+ info->end = end;
+ info->next_sp = NULL;
+
+ return true;
+}
+
+/* Called from get_stack_info_noinstr - so must be noinstr too */
+bool noinstr in_entry_stack(unsigned long *stack, struct stack_info *info)
+{
+ struct entry_stack *ss = cpu_entry_stack(smp_processor_id());
+
+ void *begin = ss;
+ void *end = ss + 1;
+
+ if ((void *)stack < begin || (void *)stack >= end)
+ return false;
+
+ info->type = STACK_TYPE_ENTRY;
+ info->begin = begin;
+ info->end = end;
+ info->next_sp = NULL;
+
+ return true;
+}
+
+static void printk_stack_address(unsigned long address, int reliable,
+ const char *log_lvl)
+{
+ touch_nmi_watchdog();
+ printk("%s %s%pBb\n", log_lvl, reliable ? "" : "? ", (void *)address);
+}
+
+static int copy_code(struct pt_regs *regs, u8 *buf, unsigned long src,
+ unsigned int nbytes)
+{
+ if (!user_mode(regs))
+ return copy_from_kernel_nofault(buf, (u8 *)src, nbytes);
+
+ /* The user space code from other tasks cannot be accessed. */
+ if (regs != task_pt_regs(current))
+ return -EPERM;
+
+ /*
+ * Even if named copy_from_user_nmi() this can be invoked from
+ * other contexts and will not try to resolve a pagefault, which is
+ * the correct thing to do here as this code can be called from any
+ * context.
+ */
+ return copy_from_user_nmi(buf, (void __user *)src, nbytes);
+}
+
+/*
+ * There are a couple of reasons for the 2/3rd prologue, courtesy of Linus:
+ *
+ * In case where we don't have the exact kernel image (which, if we did, we can
+ * simply disassemble and navigate to the RIP), the purpose of the bigger
+ * prologue is to have more context and to be able to correlate the code from
+ * the different toolchains better.
+ *
+ * In addition, it helps in recreating the register allocation of the failing
+ * kernel and thus make sense of the register dump.
+ *
+ * What is more, the additional complication of a variable length insn arch like
+ * x86 warrants having longer byte sequence before rIP so that the disassembler
+ * can "sync" up properly and find instruction boundaries when decoding the
+ * opcode bytes.
+ *
+ * Thus, the 2/3rds prologue and 64 byte OPCODE_BUFSIZE is just a random
+ * guesstimate in attempt to achieve all of the above.
+ */
+void show_opcodes(struct pt_regs *regs, const char *loglvl)
+{
+#define PROLOGUE_SIZE 42
+#define EPILOGUE_SIZE 21
+#define OPCODE_BUFSIZE (PROLOGUE_SIZE + 1 + EPILOGUE_SIZE)
+ u8 opcodes[OPCODE_BUFSIZE];
+ unsigned long prologue = regs->ip - PROLOGUE_SIZE;
+
+ switch (copy_code(regs, opcodes, prologue, sizeof(opcodes))) {
+ case 0:
+ printk("%sCode: %" __stringify(PROLOGUE_SIZE) "ph <%02x> %"
+ __stringify(EPILOGUE_SIZE) "ph\n", loglvl, opcodes,
+ opcodes[PROLOGUE_SIZE], opcodes + PROLOGUE_SIZE + 1);
+ break;
+ case -EPERM:
+ /* No access to the user space stack of other tasks. Ignore. */
+ break;
+ default:
+ printk("%sCode: Unable to access opcode bytes at 0x%lx.\n",
+ loglvl, prologue);
+ break;
+ }
+}
+
+void show_ip(struct pt_regs *regs, const char *loglvl)
+{
+#ifdef CONFIG_X86_32
+ printk("%sEIP: %pS\n", loglvl, (void *)regs->ip);
+#else
+ printk("%sRIP: %04x:%pS\n", loglvl, (int)regs->cs, (void *)regs->ip);
+#endif
+ show_opcodes(regs, loglvl);
+}
+
+void show_iret_regs(struct pt_regs *regs, const char *log_lvl)
+{
+ show_ip(regs, log_lvl);
+ printk("%sRSP: %04x:%016lx EFLAGS: %08lx", log_lvl, (int)regs->ss,
+ regs->sp, regs->flags);
+}
+
+static void show_regs_if_on_stack(struct stack_info *info, struct pt_regs *regs,
+ bool partial, const char *log_lvl)
+{
+ /*
+ * These on_stack() checks aren't strictly necessary: the unwind code
+ * has already validated the 'regs' pointer. The checks are done for
+ * ordering reasons: if the registers are on the next stack, we don't
+ * want to print them out yet. Otherwise they'll be shown as part of
+ * the wrong stack. Later, when show_trace_log_lvl() switches to the
+ * next stack, this function will be called again with the same regs so
+ * they can be printed in the right context.
+ */
+ if (!partial && on_stack(info, regs, sizeof(*regs))) {
+ __show_regs(regs, SHOW_REGS_SHORT, log_lvl);
+
+ } else if (partial && on_stack(info, (void *)regs + IRET_FRAME_OFFSET,
+ IRET_FRAME_SIZE)) {
+ /*
+ * When an interrupt or exception occurs in entry code, the
+ * full pt_regs might not have been saved yet. In that case
+ * just print the iret frame.
+ */
+ show_iret_regs(regs, log_lvl);
+ }
+}
+
+/*
+ * This function reads pointers from the stack and dereferences them. The
+ * pointers may not have their KMSAN shadow set up properly, which may result
+ * in false positive reports. Disable instrumentation to avoid those.
+ */
+__no_kmsan_checks
+static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, const char *log_lvl)
+{
+ struct unwind_state state;
+ struct stack_info stack_info = {0};
+ unsigned long visit_mask = 0;
+ int graph_idx = 0;
+ bool partial = false;
+
+ printk("%sCall Trace:\n", log_lvl);
+
+ unwind_start(&state, task, regs, stack);
+ regs = unwind_get_entry_regs(&state, &partial);
+
+ /*
+ * Iterate through the stacks, starting with the current stack pointer.
+ * Each stack has a pointer to the next one.
+ *
+ * x86-64 can have several stacks:
+ * - task stack
+ * - interrupt stack
+ * - HW exception stacks (double fault, nmi, debug, mce)
+ * - entry stack
+ *
+ * x86-32 can have up to four stacks:
+ * - task stack
+ * - softirq stack
+ * - hardirq stack
+ * - entry stack
+ */
+ for (stack = stack ?: get_stack_pointer(task, regs);
+ stack;
+ stack = stack_info.next_sp) {
+ const char *stack_name;
+
+ stack = PTR_ALIGN(stack, sizeof(long));
+
+ if (get_stack_info(stack, task, &stack_info, &visit_mask)) {
+ /*
+ * We weren't on a valid stack. It's possible that
+ * we overflowed a valid stack into a guard page.
+ * See if the next page up is valid so that we can
+ * generate some kind of backtrace if this happens.
+ */
+ stack = (unsigned long *)PAGE_ALIGN((unsigned long)stack);
+ if (get_stack_info(stack, task, &stack_info, &visit_mask))
+ break;
+ }
+
+ stack_name = stack_type_name(stack_info.type);
+ if (stack_name)
+ printk("%s <%s>\n", log_lvl, stack_name);
+
+ if (regs)
+ show_regs_if_on_stack(&stack_info, regs, partial, log_lvl);
+
+ /*
+ * Scan the stack, printing any text addresses we find. At the
+ * same time, follow proper stack frames with the unwinder.
+ *
+ * Addresses found during the scan which are not reported by
+ * the unwinder are considered to be additional clues which are
+ * sometimes useful for debugging and are prefixed with '?'.
+ * This also serves as a failsafe option in case the unwinder
+ * goes off in the weeds.
+ */
+ for (; stack < stack_info.end; stack++) {
+ unsigned long real_addr;
+ int reliable = 0;
+ unsigned long addr = READ_ONCE_NOCHECK(*stack);
+ unsigned long *ret_addr_p =
+ unwind_get_return_address_ptr(&state);
+
+ if (!__kernel_text_address(addr))
+ continue;
+
+ /*
+ * Don't print regs->ip again if it was already printed
+ * by show_regs_if_on_stack().
+ */
+ if (regs && stack == &regs->ip)
+ goto next;
+
+ if (stack == ret_addr_p)
+ reliable = 1;
+
+ /*
+ * When function graph tracing is enabled for a
+ * function, its return address on the stack is
+ * replaced with the address of an ftrace handler
+ * (return_to_handler). In that case, before printing
+ * the "real" address, we want to print the handler
+ * address as an "unreliable" hint that function graph
+ * tracing was involved.
+ */
+ real_addr = ftrace_graph_ret_addr(task, &graph_idx,
+ addr, stack);
+ if (real_addr != addr)
+ printk_stack_address(addr, 0, log_lvl);
+ printk_stack_address(real_addr, reliable, log_lvl);
+
+ if (!reliable)
+ continue;
+
+next:
+ /*
+ * Get the next frame from the unwinder. No need to
+ * check for an error: if anything goes wrong, the rest
+ * of the addresses will just be printed as unreliable.
+ */
+ unwind_next_frame(&state);
+
+ /* if the frame has entry regs, print them */
+ regs = unwind_get_entry_regs(&state, &partial);
+ if (regs)
+ show_regs_if_on_stack(&stack_info, regs, partial, log_lvl);
+ }
+
+ if (stack_name)
+ printk("%s </%s>\n", log_lvl, stack_name);
+ }
+}
+
+void show_stack(struct task_struct *task, unsigned long *sp,
+ const char *loglvl)
+{
+ task = task ? : current;
+
+ /*
+ * Stack frames below this one aren't interesting. Don't show them
+ * if we're printing for %current.
+ */
+ if (!sp && task == current)
+ sp = get_stack_pointer(current, NULL);
+
+ show_trace_log_lvl(task, NULL, sp, loglvl);
+}
+
+void show_stack_regs(struct pt_regs *regs)
+{
+ show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
+}
+
+static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;
+static unsigned int die_nest_count;
+
+unsigned long oops_begin(void)
+{
+ int cpu;
+ unsigned long flags;
+
+ oops_enter();
+
+ /* racy, but better than risking deadlock. */
+ raw_local_irq_save(flags);
+ cpu = smp_processor_id();
+ if (!arch_spin_trylock(&die_lock)) {
+ if (cpu == die_owner)
+ /* nested oops. should stop eventually */;
+ else
+ arch_spin_lock(&die_lock);
+ }
+ die_nest_count++;
+ die_owner = cpu;
+ console_verbose();
+ bust_spinlocks(1);
+ return flags;
+}
+NOKPROBE_SYMBOL(oops_begin);
+
+void __noreturn rewind_stack_and_make_dead(int signr);
+
+void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
+{
+ if (regs && kexec_should_crash(current))
+ crash_kexec(regs);
+
+ bust_spinlocks(0);
+ die_owner = -1;
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+ die_nest_count--;
+ if (!die_nest_count)
+ /* Nest count reaches zero, release the lock. */
+ arch_spin_unlock(&die_lock);
+ raw_local_irq_restore(flags);
+ oops_exit();
+
+ /* Executive summary in case the oops scrolled away */
+ __show_regs(&exec_summary_regs, SHOW_REGS_ALL, KERN_DEFAULT);
+
+ if (!signr)
+ return;
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+ if (panic_on_oops)
+ panic("Fatal exception");
+
+ /*
+ * We're not going to return, but we might be on an IST stack or
+ * have very little stack space left. Rewind the stack and kill
+ * the task.
+ * Before we rewind the stack, we have to tell KASAN that we're going to
+ * reuse the task stack and that existing poisons are invalid.
+ */
+ kasan_unpoison_task_stack(current);
+ rewind_stack_and_make_dead(signr);
+}
+NOKPROBE_SYMBOL(oops_end);
+
+static void __die_header(const char *str, struct pt_regs *regs, long err)
+{
+ const char *pr = "";
+
+ /* Save the regs of the first oops for the executive summary later. */
+ if (!die_counter)
+ exec_summary_regs = *regs;
+
+ if (IS_ENABLED(CONFIG_PREEMPTION))
+ pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
+
+ printk(KERN_DEFAULT
+ "%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
+ pr,
+ IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
+ debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
+ IS_ENABLED(CONFIG_KASAN) ? " KASAN" : "",
+ IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION) ?
+ (boot_cpu_has(X86_FEATURE_PTI) ? " PTI" : " NOPTI") : "");
+}
+NOKPROBE_SYMBOL(__die_header);
+
+static int __die_body(const char *str, struct pt_regs *regs, long err)
+{
+ show_regs(regs);
+ print_modules();
+
+ if (notify_die(DIE_OOPS, str, regs, err,
+ current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
+ return 1;
+
+ return 0;
+}
+NOKPROBE_SYMBOL(__die_body);
+
+int __die(const char *str, struct pt_regs *regs, long err)
+{
+ __die_header(str, regs, err);
+ return __die_body(str, regs, err);
+}
+NOKPROBE_SYMBOL(__die);
+
+/*
+ * This is gone through when something in the kernel has done something bad
+ * and is about to be terminated:
+ */
+void die(const char *str, struct pt_regs *regs, long err)
+{
+ unsigned long flags = oops_begin();
+ int sig = SIGSEGV;
+
+ if (__die(str, regs, err))
+ sig = 0;
+ oops_end(flags, regs, sig);
+}
+
+void die_addr(const char *str, struct pt_regs *regs, long err, long gp_addr)
+{
+ unsigned long flags = oops_begin();
+ int sig = SIGSEGV;
+
+ __die_header(str, regs, err);
+ if (gp_addr)
+ kasan_non_canonical_hook(gp_addr);
+ if (__die_body(str, regs, err))
+ sig = 0;
+ oops_end(flags, regs, sig);
+}
+
+void show_regs(struct pt_regs *regs)
+{
+ enum show_regs_mode print_kernel_regs;
+
+ show_regs_print_info(KERN_DEFAULT);
+
+ print_kernel_regs = user_mode(regs) ? SHOW_REGS_USER : SHOW_REGS_ALL;
+ __show_regs(regs, print_kernel_regs, KERN_DEFAULT);
+
+ /*
+ * When in-kernel, we also print out the stack at the time of the fault..
+ */
+ if (!user_mode(regs))
+ show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
+}
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