forked from luck/tmp_suning_uos_patched
x86/dumpstack: Handle stack overflow on all stacks
We currently special-case stack overflow on the task stack. We're going to start putting special stacks in the fixmap with a custom layout, so they'll have guard pages, too. Teach the unwinder to be able to unwind an overflow of any of the stacks. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bpetkov@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Link: https://lkml.kernel.org/r/20171204150605.802057305@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -112,24 +112,28 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
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* - task stack
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* - interrupt stack
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* - HW exception stacks (double fault, nmi, debug, mce)
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* - SYSENTER stack
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*
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* x86-32 can have up to three stacks:
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* x86-32 can have up to four stacks:
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* - task stack
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* - softirq stack
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* - hardirq stack
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* - SYSENTER stack
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*/
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for (regs = NULL; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
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const char *stack_name;
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/*
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* If we overflowed the task stack into a guard page, jump back
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* to the bottom of the usable stack.
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*/
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if (task_stack_page(task) - (void *)stack < PAGE_SIZE)
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stack = task_stack_page(task);
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if (get_stack_info(stack, task, &stack_info, &visit_mask))
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break;
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if (get_stack_info(stack, task, &stack_info, &visit_mask)) {
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/*
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* We weren't on a valid stack. It's possible that
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* we overflowed a valid stack into a guard page.
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* See if the next page up is valid so that we can
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* generate some kind of backtrace if this happens.
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*/
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stack = (unsigned long *)PAGE_ALIGN((unsigned long)stack);
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if (get_stack_info(stack, task, &stack_info, &visit_mask))
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break;
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}
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stack_name = stack_type_name(stack_info.type);
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if (stack_name)
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