mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-10-31 16:54:21 +00:00
8a1ccfbc9e
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>
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_STACKTRACE_H
|
|
#define __ASM_STACKTRACE_H
|
|
|
|
#include <linux/percpu.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/task_stack.h>
|
|
|
|
#include <asm/memory.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/sdei.h>
|
|
|
|
struct stackframe {
|
|
unsigned long fp;
|
|
unsigned long pc;
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
int graph;
|
|
#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);
|
|
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,
|
|
struct stack_info *info)
|
|
{
|
|
unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
|
|
unsigned long high = low + IRQ_STACK_SIZE;
|
|
|
|
if (!low)
|
|
return false;
|
|
|
|
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,
|
|
struct stack_info *info)
|
|
{
|
|
unsigned long low = (unsigned long)task_stack_page(tsk);
|
|
unsigned long high = low + THREAD_SIZE;
|
|
|
|
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,
|
|
struct stack_info *info)
|
|
{
|
|
unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
|
|
unsigned long high = low + OVERFLOW_STACK_SIZE;
|
|
|
|
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,
|
|
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,
|
|
struct stack_info *info)
|
|
{
|
|
if (on_task_stack(tsk, sp, info))
|
|
return true;
|
|
if (tsk != current || preemptible())
|
|
return false;
|
|
if (on_irq_stack(sp, info))
|
|
return true;
|
|
if (on_overflow_stack(sp, info))
|
|
return true;
|
|
if (on_sdei_stack(sp, info))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
#endif /* __ASM_STACKTRACE_H */
|