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x86/dumpstack: Fix off-by-one errors in stack identification 

The get_stack_info() function is off-by-one when checking whether an
address is on a IRQ stack or a IST stack. This prevents an overflowed
IRQ or IST stack from being dumped properly.

[ tglx: Do the same for 32-bit ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160143.785651055@linutronix.de
This commit is contained in:
Andy Lutomirski 2019-04-14 17:59:39 +02:00 committed by Borislav Petkov
parent 7dbcf2b0b7
commit fa33215422
2 changed files with 4 additions and 4 deletions
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4
arch/x86/kernel/dumpstack_32.c
View File

@ -41,7 +41,7 @@ static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
* This is a software stack, so 'end' can be a valid stack pointer.
* It just means the stack is empty.
*/
if (stack <= begin || stack > end)
if (stack < begin || stack > end)
return false;
info->type = STACK_TYPE_IRQ;
@ -66,7 +66,7 @@ static bool in_softirq_stack(unsigned long *stack, struct stack_info *info)
* This is a software stack, so 'end' can be a valid stack pointer.
* It just means the stack is empty.
*/
if (stack <= begin || stack > end)
if (stack < begin || stack > end)
return false;
info->type = STACK_TYPE_SOFTIRQ;

4
arch/x86/kernel/dumpstack_64.c
View File

@ -65,7 +65,7 @@ static bool in_exception_stack(unsigned long *stack, struct stack_info *info)
begin = end - (exception_stack_sizes[k] / sizeof(long));
regs = (struct pt_regs *)end - 1;
if (stack <= begin || stack >= end)
if (stack < begin || stack >= end)
continue;
info->type = STACK_TYPE_EXCEPTION + k;
@ -88,7 +88,7 @@ static bool in_irq_stack(unsigned long *stack, struct stack_info *info)
* This is a software stack, so 'end' can be a valid stack pointer.
* It just means the stack is empty.
*/
if (stack <= begin || stack > end)
if (stack < begin || stack >= end)
return false;
info->type = STACK_TYPE_IRQ;