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arm64: Add stack information to on_accessible_stack

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In preparation for enabling the stackleak plugin on arm64,
we need a way to get the bounds of the current stack. Extend
on_accessible_stack to get this information.

Acked-by: Alexander Popov <alex.popov@linux.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
[will: folded in fix for allmodconfig build breakage w/ sdei]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Laura Abbott
2018-07-20 14:41:53 -07:00
committed by Will Deacon
parent 2c870e6113
commit 8a1ccfbc9e
5 changed files with 111 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/include/asm/stacktrace.h
+61 -12
View File
@@ -32,6 +32,21 @@ struct stackframe {
#endif
};
enum stack_type {
STACK_TYPE_UNKNOWN,
STACK_TYPE_TASK,
STACK_TYPE_IRQ,
STACK_TYPE_OVERFLOW,
STACK_TYPE_SDEI_NORMAL,
STACK_TYPE_SDEI_CRITICAL,
};
struct stack_info {
unsigned long low;
unsigned long high;
enum stack_type type;
};
extern int unwind_frame(struct task_struct *tsk, struct stackframe *frame);
extern void walk_stackframe(struct task_struct *tsk, struct stackframe *frame,
int (*fn)(struct stackframe *, void *), void *data);
@@ -39,7 +54,8 @@ extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk);
DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
static inline bool on_irq_stack(unsigned long sp)
static inline bool on_irq_stack(unsigned long sp,
struct stack_info *info)
{
unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
unsigned long high = low + IRQ_STACK_SIZE;
@@ -47,46 +63,79 @@ static inline bool on_irq_stack(unsigned long sp)
if (!low)
return false;
return (low <= sp && sp < high);
if (sp < low || sp >= high)
return false;
if (info) {
info->low = low;
info->high = high;
info->type = STACK_TYPE_IRQ;
}
return true;
}
static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp)
static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp,
struct stack_info *info)
{
unsigned long low = (unsigned long)task_stack_page(tsk);
unsigned long high = low + THREAD_SIZE;
return (low <= sp && sp < high);
if (sp < low || sp >= high)
return false;
if (info) {
info->low = low;
info->high = high;
info->type = STACK_TYPE_TASK;
}
return true;
}
#ifdef CONFIG_VMAP_STACK
DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
static inline bool on_overflow_stack(unsigned long sp)
static inline bool on_overflow_stack(unsigned long sp,
struct stack_info *info)
{
unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
unsigned long high = low + OVERFLOW_STACK_SIZE;
return (low <= sp && sp < high);
if (sp < low || sp >= high)
return false;
if (info) {
info->low = low;
info->high = high;
info->type = STACK_TYPE_OVERFLOW;
}
return true;
}
#else
static inline bool on_overflow_stack(unsigned long sp) { return false; }
static inline bool on_overflow_stack(unsigned long sp,
struct stack_info *info) { return false; }
#endif
/*
* We can only safely access per-cpu stacks from current in a non-preemptible
* context.
*/
static inline bool on_accessible_stack(struct task_struct *tsk, unsigned long sp)
static inline bool on_accessible_stack(struct task_struct *tsk,
unsigned long sp,
struct stack_info *info)
{
if (on_task_stack(tsk, sp))
if (on_task_stack(tsk, sp, info))
return true;
if (tsk != current || preemptible())
return false;
if (on_irq_stack(sp))
if (on_irq_stack(sp, info))
return true;
if (on_overflow_stack(sp))
if (on_overflow_stack(sp, info))
return true;
if (on_sdei_stack(sp))
if (on_sdei_stack(sp, info))
return true;
return false;