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x86/dumpstack: Save first regs set for the executive summary 

Save the regs set when __die() is onvoked for the first time and print it
in oops_end().

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Link: https://lkml.kernel.org/r/20180417161124.5294-9-bp@alien8.de
This commit is contained in:
Borislav Petkov 2018-04-17 18:11:23 +02:00 committed by Thomas Gleixner
parent 7cccf0725c
commit 602bd705da
1 changed files with 12 additions and 20 deletions
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32
arch/x86/kernel/dumpstack.c
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@ -28,6 +28,8 @@ int panic_on_unrecovered_nmi;
int panic_on_io_nmi;
static int die_counter;
static struct pt_regs exec_summary_regs;
bool in_task_stack(unsigned long *stack, struct task_struct *task,
struct stack_info *info)
{
@ -321,6 +323,9 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
raw_local_irq_restore(flags);
oops_exit();
/* Executive summary in case the oops scrolled away */
__show_regs(&exec_summary_regs, true);
if (!signr)
return;
if (in_interrupt())
@ -339,10 +344,10 @@ NOKPROBE_SYMBOL(oops_end);
int __die(const char *str, struct pt_regs *regs, long err)
{
#ifdef CONFIG_X86_32
unsigned short ss;
unsigned long sp;
#endif
/* Save the regs of the first oops for the executive summary later. */
if (!die_counter)
exec_summary_regs = *regs;
printk(KERN_DEFAULT
"%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
@ -352,26 +357,13 @@ int __die(const char *str, struct pt_regs *regs, long err)
IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION) ?
(boot_cpu_has(X86_FEATURE_PTI) ? " PTI" : " NOPTI") : "");
show_regs(regs);
print_modules();
if (notify_die(DIE_OOPS, str, regs, err,
current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
return 1;
print_modules();
show_regs(regs);
#ifdef CONFIG_X86_32
if (user_mode(regs)) {
sp = regs->sp;
ss = regs->ss;
} else {
sp = kernel_stack_pointer(regs);
savesegment(ss, ss);
}
printk(KERN_EMERG "EIP: %pS SS:ESP: %04x:%08lx\n",
(void *)regs->ip, ss, sp);
#else
/* Executive summary in case the oops scrolled away */
printk(KERN_ALERT "RIP: %pS RSP: %016lx\n", (void *)regs->ip, regs->sp);
#endif
return 0;
}
NOKPROBE_SYMBOL(__die);