1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4 */
  5
  6#include <linux/audit.h>
  7#include <linux/ptrace.h>
  8#include <linux/sched.h>
  9#include <linux/tracehook.h>
 10#include <linux/uaccess.h>
 11#include <asm/ptrace-abi.h>
 12
 13void user_enable_single_step(struct task_struct *child)
 14{
 15	child->ptrace |= PT_DTRACE;
 16	child->thread.singlestep_syscall = 0;
 17
 18#ifdef SUBARCH_SET_SINGLESTEPPING
 19	SUBARCH_SET_SINGLESTEPPING(child, 1);
 20#endif
 21}
 22
 23void user_disable_single_step(struct task_struct *child)
 24{
 25	child->ptrace &= ~PT_DTRACE;
 26	child->thread.singlestep_syscall = 0;
 27
 28#ifdef SUBARCH_SET_SINGLESTEPPING
 29	SUBARCH_SET_SINGLESTEPPING(child, 0);
 30#endif
 31}
 32
 33/*
 34 * Called by kernel/ptrace.c when detaching..
 35 */
 36void ptrace_disable(struct task_struct *child)
 37{
 38	user_disable_single_step(child);
 39}
 40
 41extern int peek_user(struct task_struct * child, long addr, long data);
 42extern int poke_user(struct task_struct * child, long addr, long data);
 43
 44long arch_ptrace(struct task_struct *child, long request,
 45		 unsigned long addr, unsigned long data)
 46{
 47	int i, ret;
 48	unsigned long __user *p = (void __user *)data;
 49	void __user *vp = p;
 50
 51	switch (request) {
 52	/* read the word at location addr in the USER area. */
 53	case PTRACE_PEEKUSR:
 54		ret = peek_user(child, addr, data);
 55		break;
 56
 57	/* write the word at location addr in the USER area */
 58	case PTRACE_POKEUSR:
 59		ret = poke_user(child, addr, data);
 60		break;
 61
 62	case PTRACE_SYSEMU:
 63	case PTRACE_SYSEMU_SINGLESTEP:
 64		ret = -EIO;
 65		break;
 66
 67#ifdef PTRACE_GETREGS
 68	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
 69		if (!access_ok(p, MAX_REG_OFFSET)) {
 70			ret = -EIO;
 71			break;
 72		}
 73		for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
 74			__put_user(getreg(child, i), p);
 75			p++;
 76		}
 77		ret = 0;
 78		break;
 79	}
 80#endif
 81#ifdef PTRACE_SETREGS
 82	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
 83		unsigned long tmp = 0;
 84		if (!access_ok(p, MAX_REG_OFFSET)) {
 85			ret = -EIO;
 86			break;
 87		}
 88		for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
 89			__get_user(tmp, p);
 90			putreg(child, i, tmp);
 91			p++;
 92		}
 93		ret = 0;
 94		break;
 95	}
 96#endif
 97	case PTRACE_GET_THREAD_AREA:
 98		ret = ptrace_get_thread_area(child, addr, vp);
 99		break;
100
101	case PTRACE_SET_THREAD_AREA:
102		ret = ptrace_set_thread_area(child, addr, vp);
103		break;
104
105	default:
106		ret = ptrace_request(child, request, addr, data);
107		if (ret == -EIO)
108			ret = subarch_ptrace(child, request, addr, data);
109		break;
110	}
111
112	return ret;
113}
114
115static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
116{
117	/* Send us the fake SIGTRAP */
118	force_sig_fault(SIGTRAP, TRAP_BRKPT,
119			/* User-mode eip? */
120			UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
121}
122
123/*
124 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
125 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
126 */
127int syscall_trace_enter(struct pt_regs *regs)
128{
129	audit_syscall_entry(UPT_SYSCALL_NR(&regs->regs),
130			    UPT_SYSCALL_ARG1(&regs->regs),
131			    UPT_SYSCALL_ARG2(&regs->regs),
132			    UPT_SYSCALL_ARG3(&regs->regs),
133			    UPT_SYSCALL_ARG4(&regs->regs));
134
135	if (!test_thread_flag(TIF_SYSCALL_TRACE))
136		return 0;
137
138	return tracehook_report_syscall_entry(regs);
139}
140
141void syscall_trace_leave(struct pt_regs *regs)
142{
143	int ptraced = current->ptrace;
144
145	audit_syscall_exit(regs);
146
147	/* Fake a debug trap */
148	if (ptraced & PT_DTRACE)
149		send_sigtrap(&regs->regs, 0);
150
151	if (!test_thread_flag(TIF_SYSCALL_TRACE))
152		return;
153
154	tracehook_report_syscall_exit(regs, 0);
155	/* force do_signal() --> is_syscall() */
156	if (ptraced & PT_PTRACED)
157		set_thread_flag(TIF_SIGPENDING);
158}

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4 */
  5
  6#include <linux/audit.h>
  7#include <linux/ptrace.h>
  8#include <linux/sched.h>
  9#include <linux/tracehook.h>
 10#include <linux/uaccess.h>
 11#include <asm/ptrace-abi.h>
 12
 13void user_enable_single_step(struct task_struct *child)
 14{
 15	child->ptrace |= PT_DTRACE;
 16	child->thread.singlestep_syscall = 0;
 17
 18#ifdef SUBARCH_SET_SINGLESTEPPING
 19	SUBARCH_SET_SINGLESTEPPING(child, 1);
 20#endif
 21}
 22
 23void user_disable_single_step(struct task_struct *child)
 24{
 25	child->ptrace &= ~PT_DTRACE;
 26	child->thread.singlestep_syscall = 0;
 27
 28#ifdef SUBARCH_SET_SINGLESTEPPING
 29	SUBARCH_SET_SINGLESTEPPING(child, 0);
 30#endif
 31}
 32
 33/*
 34 * Called by kernel/ptrace.c when detaching..
 35 */
 36void ptrace_disable(struct task_struct *child)
 37{
 38	user_disable_single_step(child);
 39}
 40
 41extern int peek_user(struct task_struct * child, long addr, long data);
 42extern int poke_user(struct task_struct * child, long addr, long data);
 43
 44long arch_ptrace(struct task_struct *child, long request,
 45		 unsigned long addr, unsigned long data)
 46{
 47	int i, ret;
 48	unsigned long __user *p = (void __user *)data;
 49	void __user *vp = p;
 50
 51	switch (request) {
 52	/* read the word at location addr in the USER area. */
 53	case PTRACE_PEEKUSR:
 54		ret = peek_user(child, addr, data);
 55		break;
 56
 57	/* write the word at location addr in the USER area */
 58	case PTRACE_POKEUSR:
 59		ret = poke_user(child, addr, data);
 60		break;
 61
 62	case PTRACE_SYSEMU:
 63	case PTRACE_SYSEMU_SINGLESTEP:
 64		ret = -EIO;
 65		break;
 66
 67#ifdef PTRACE_GETREGS
 68	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
 69		if (!access_ok(p, MAX_REG_OFFSET)) {
 70			ret = -EIO;
 71			break;
 72		}
 73		for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
 74			__put_user(getreg(child, i), p);
 75			p++;
 76		}
 77		ret = 0;
 78		break;
 79	}
 80#endif
 81#ifdef PTRACE_SETREGS
 82	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
 83		unsigned long tmp = 0;
 84		if (!access_ok(p, MAX_REG_OFFSET)) {
 85			ret = -EIO;
 86			break;
 87		}
 88		for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
 89			__get_user(tmp, p);
 90			putreg(child, i, tmp);
 91			p++;
 92		}
 93		ret = 0;
 94		break;
 95	}
 96#endif
 97	case PTRACE_GET_THREAD_AREA:
 98		ret = ptrace_get_thread_area(child, addr, vp);
 99		break;
100
101	case PTRACE_SET_THREAD_AREA:
102		ret = ptrace_set_thread_area(child, addr, vp);
103		break;
104
105	default:
106		ret = ptrace_request(child, request, addr, data);
107		if (ret == -EIO)
108			ret = subarch_ptrace(child, request, addr, data);
109		break;
110	}
111
112	return ret;
113}
114
115static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
116{
117	/* Send us the fake SIGTRAP */
118	force_sig_fault(SIGTRAP, TRAP_BRKPT,
119			/* User-mode eip? */
120			UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
121}
122
123/*
124 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
125 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
126 */
127int syscall_trace_enter(struct pt_regs *regs)
128{
129	audit_syscall_entry(UPT_SYSCALL_NR(&regs->regs),
130			    UPT_SYSCALL_ARG1(&regs->regs),
131			    UPT_SYSCALL_ARG2(&regs->regs),
132			    UPT_SYSCALL_ARG3(&regs->regs),
133			    UPT_SYSCALL_ARG4(&regs->regs));
134
135	if (!test_thread_flag(TIF_SYSCALL_TRACE))
136		return 0;
137
138	return tracehook_report_syscall_entry(regs);
139}
140
141void syscall_trace_leave(struct pt_regs *regs)
142{
143	int ptraced = current->ptrace;
144
145	audit_syscall_exit(regs);
146
147	/* Fake a debug trap */
148	if (ptraced & PT_DTRACE)
149		send_sigtrap(&regs->regs, 0);
150
151	if (!test_thread_flag(TIF_SYSCALL_TRACE))
152		return;
153
154	tracehook_report_syscall_exit(regs, 0);
155	/* force do_signal() --> is_syscall() */
156	if (ptraced & PT_PTRACED)
157		set_thread_flag(TIF_SIGPENDING);
158}