68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright IBM Corp. 2006
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/stacktrace.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <asm/unwind.h>
|
|
#include <asm/kprobes.h>
|
|
|
|
void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
|
|
struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
struct unwind_state state;
|
|
unsigned long addr;
|
|
|
|
unwind_for_each_frame(&state, task, regs, 0) {
|
|
addr = unwind_get_return_address(&state);
|
|
if (!addr || !consume_entry(cookie, addr, false))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function returns an error if it detects any unreliable features of the
|
|
* stack. Otherwise it guarantees that the stack trace is reliable.
|
|
*
|
|
* If the task is not 'current', the caller *must* ensure the task is inactive.
|
|
*/
|
|
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
|
|
void *cookie, struct task_struct *task)
|
|
{
|
|
struct unwind_state state;
|
|
unsigned long addr;
|
|
|
|
unwind_for_each_frame(&state, task, NULL, 0) {
|
|
if (state.stack_info.type != STACK_TYPE_TASK)
|
|
return -EINVAL;
|
|
|
|
if (state.regs)
|
|
return -EINVAL;
|
|
|
|
addr = unwind_get_return_address(&state);
|
|
if (!addr)
|
|
return -EINVAL;
|
|
|
|
#ifdef CONFIG_KPROBES
|
|
/*
|
|
* Mark stacktraces with kretprobed functions on them
|
|
* as unreliable.
|
|
*/
|
|
if (state.ip == (unsigned long)kretprobe_trampoline)
|
|
return -EINVAL;
|
|
#endif
|
|
|
|
if (!consume_entry(cookie, addr, false))
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check for stack corruption */
|
|
if (unwind_error(&state))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|