diff options
Diffstat (limited to 'arch/x86/kernel/dumpstack.c')
| -rw-r--r-- | arch/x86/kernel/dumpstack.c | 50 |
1 files changed, 30 insertions, 20 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 456511b2284e..48ce44576947 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -71,6 +71,22 @@ static void printk_stack_address(unsigned long address, int reliable, printk("%s %s%pB\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); + + /* + * Make sure userspace isn't trying to trick us into dumping kernel + * memory by pointing the userspace instruction pointer at it. + */ + if (__chk_range_not_ok(src, nbytes, TASK_SIZE_MAX)) + return -EINVAL; + + return copy_from_user_nmi(buf, (void __user *)src, nbytes); +} + /* * There are a couple of reasons for the 2/3rd prologue, courtesy of Linus: * @@ -97,17 +113,8 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl) #define OPCODE_BUFSIZE (PROLOGUE_SIZE + 1 + EPILOGUE_SIZE) u8 opcodes[OPCODE_BUFSIZE]; unsigned long prologue = regs->ip - PROLOGUE_SIZE; - bool bad_ip; - - /* - * Make sure userspace isn't trying to trick us into dumping kernel - * memory by pointing the userspace instruction pointer at it. - */ - bad_ip = user_mode(regs) && - __chk_range_not_ok(prologue, OPCODE_BUFSIZE, TASK_SIZE_MAX); - if (bad_ip || probe_kernel_read(opcodes, (u8 *)prologue, - OPCODE_BUFSIZE)) { + if (copy_code(regs, opcodes, prologue, sizeof(opcodes))) { printk("%sCode: Bad RIP value.\n", loglvl); } else { printk("%sCode: %" __stringify(PROLOGUE_SIZE) "ph <%02x> %" @@ -126,15 +133,15 @@ void show_ip(struct pt_regs *regs, const char *loglvl) show_opcodes(regs, loglvl); } -void show_iret_regs(struct pt_regs *regs) +void show_iret_regs(struct pt_regs *regs, const char *log_lvl) { - show_ip(regs, KERN_DEFAULT); - printk(KERN_DEFAULT "RSP: %04x:%016lx EFLAGS: %08lx", (int)regs->ss, + 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) + bool partial, const char *log_lvl) { /* * These on_stack() checks aren't strictly necessary: the unwind code @@ -146,7 +153,7 @@ static void show_regs_if_on_stack(struct stack_info *info, struct pt_regs *regs, * they can be printed in the right context. */ if (!partial && on_stack(info, regs, sizeof(*regs))) { - __show_regs(regs, SHOW_REGS_SHORT); + __show_regs(regs, SHOW_REGS_SHORT, log_lvl); } else if (partial && on_stack(info, (void *)regs + IRET_FRAME_OFFSET, IRET_FRAME_SIZE)) { @@ -155,7 +162,7 @@ static void show_regs_if_on_stack(struct stack_info *info, struct pt_regs *regs, * full pt_regs might not have been saved yet. In that case * just print the iret frame. */ - show_iret_regs(regs); + show_iret_regs(regs, log_lvl); } } @@ -210,7 +217,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, printk("%s <%s>\n", log_lvl, stack_name); if (regs) - show_regs_if_on_stack(&stack_info, regs, partial); + show_regs_if_on_stack(&stack_info, regs, partial, log_lvl); /* * Scan the stack, printing any text addresses we find. At the @@ -271,7 +278,7 @@ next: /* 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); + show_regs_if_on_stack(&stack_info, regs, partial, log_lvl); } if (stack_name) @@ -345,7 +352,7 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr) oops_exit(); /* Executive summary in case the oops scrolled away */ - __show_regs(&exec_summary_regs, SHOW_REGS_ALL); + __show_regs(&exec_summary_regs, SHOW_REGS_ALL, KERN_DEFAULT); if (!signr) return; @@ -437,9 +444,12 @@ void die_addr(const char *str, struct pt_regs *regs, long err, long gp_addr) void show_regs(struct pt_regs *regs) { + enum show_regs_mode print_kernel_regs; + show_regs_print_info(KERN_DEFAULT); - __show_regs(regs, user_mode(regs) ? SHOW_REGS_USER : SHOW_REGS_ALL); + 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.. |