1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Stack trace management functions
 4 *
 5 *  Copyright IBM Corp. 2006
 6 *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 7 */
 8
 9#include <linux/stacktrace.h>
10#include <asm/stacktrace.h>
11#include <asm/unwind.h>
 
12
13void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
14		     struct task_struct *task, struct pt_regs *regs)
15{
16	struct unwind_state state;
17	unsigned long addr;
18
19	unwind_for_each_frame(&state, task, regs, 0) {
20		addr = unwind_get_return_address(&state);
21		if (!addr || !consume_entry(cookie, addr, false))
22			break;
23	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
24}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Stack trace management functions
 4 *
 5 *  Copyright IBM Corp. 2006
 6 *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 7 */
 8
 9#include <linux/stacktrace.h>
10#include <asm/stacktrace.h>
11#include <asm/unwind.h>
12#include <asm/kprobes.h>
13
14void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
15		     struct task_struct *task, struct pt_regs *regs)
16{
17	struct unwind_state state;
18	unsigned long addr;
19
20	unwind_for_each_frame(&state, task, regs, 0) {
21		addr = unwind_get_return_address(&state);
22		if (!addr || !consume_entry(cookie, addr))
23			break;
24	}
25}
26
27int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
28			     void *cookie, struct task_struct *task)
29{
30	struct unwind_state state;
31	unsigned long addr;
32
33	unwind_for_each_frame(&state, task, NULL, 0) {
34		if (state.stack_info.type != STACK_TYPE_TASK)
35			return -EINVAL;
36
37		if (state.regs)
38			return -EINVAL;
39
40		addr = unwind_get_return_address(&state);
41		if (!addr)
42			return -EINVAL;
43
44#ifdef CONFIG_KPROBES
45		/*
46		 * Mark stacktraces with kretprobed functions on them
47		 * as unreliable.
48		 */
49		if (state.ip == (unsigned long)kretprobe_trampoline)
50			return -EINVAL;
51#endif
52
53		if (!consume_entry(cookie, addr))
54			return -EINVAL;
55	}
56
57	/* Check for stack corruption */
58	if (unwind_error(&state))
59		return -EINVAL;
60	return 0;
61}