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x86/dumpstack/64: Add noinstr version of get_stack_info()

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The get_stack_info() functionality is needed in the entry code for the
#VC exception handler. Provide a version of it in the .text.noinstr
section which can be called safely from there.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-45-joro@8bytes.org
This commit is contained in:
Joerg Roedel
2020-09-07 15:15:45 +02:00
committed by Borislav Petkov
parent 315562c9af
commit 6b27edd74a
4 changed files with 34 additions and 24 deletions
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7
arch/x86/kernel/dumpstack.c
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@@ -29,8 +29,8 @@ 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)
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;
@@ -46,7 +46,8 @@ bool in_task_stack(unsigned long *stack, struct task_struct *task,
return true;
}
bool in_entry_stack(unsigned long *stack, struct stack_info *info)
/* 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());