1 /* $NetBSD: netbsd32_ptrace.c,v 1.5 2017/12/17 20:59:27 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2016 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: netbsd32_ptrace.c,v 1.5 2017/12/17 20:59:27 christos Exp $"); 34 35 #if defined(_KERNEL_OPT) 36 #include "opt_ptrace.h" 37 #include "opt_compat_netbsd.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/module.h> 42 #include <sys/ptrace.h> 43 #include <sys/syscallvar.h> 44 45 #include <compat/netbsd32/netbsd32.h> 46 #include <compat/netbsd32/netbsd32_syscall.h> 47 #include <compat/netbsd32/netbsd32_syscallargs.h> 48 #include <compat/netbsd32/netbsd32_conv.h> 49 50 extern struct emul emul_netbsd32; 51 52 53 /* 54 * PTRACE methods 55 */ 56 57 static int 58 netbsd32_copyin_piod(struct ptrace_io_desc *piod, const void *addr, size_t len) 59 { 60 struct netbsd32_ptrace_io_desc piod32; 61 62 if (len != 0 && sizeof(piod32) != len) 63 return EINVAL; 64 65 int error = copyin(addr, &piod32, sizeof(piod32)); 66 if (error) 67 return error; 68 piod->piod_op = piod32.piod_op; 69 piod->piod_offs = NETBSD32PTR64(piod32.piod_offs); 70 piod->piod_addr = NETBSD32PTR64(piod32.piod_addr); 71 piod->piod_len = (size_t)piod32.piod_len; 72 73 return 0; 74 } 75 76 static int 77 netbsd32_copyout_piod(const struct ptrace_io_desc *piod, void *addr, size_t len) 78 { 79 struct netbsd32_ptrace_io_desc piod32; 80 81 if (len != 0 && sizeof(piod32) != len) 82 return EINVAL; 83 84 piod32.piod_op = piod->piod_op; 85 NETBSD32PTR32(piod32.piod_offs, piod->piod_offs); 86 NETBSD32PTR32(piod32.piod_addr, piod->piod_addr); 87 piod32.piod_len = (netbsd32_size_t)piod->piod_len; 88 return copyout(&piod32, addr, sizeof(piod32)); 89 } 90 91 static int 92 netbsd32_copyin_siginfo(struct ptrace_siginfo *psi, const void *addr, size_t len) 93 { 94 struct netbsd32_ptrace_siginfo psi32; 95 96 if (sizeof(psi32) != len) 97 return EINVAL; 98 99 int error = copyin(addr, &psi32, sizeof(psi32)); 100 if (error) 101 return error; 102 psi->psi_lwpid = psi32.psi_lwpid; 103 netbsd32_si32_to_si(&psi->psi_siginfo, &psi32.psi_siginfo); 104 return 0; 105 } 106 107 static int 108 netbsd32_copyout_siginfo(const struct ptrace_siginfo *psi, void *addr, size_t len) 109 { 110 struct netbsd32_ptrace_siginfo psi32; 111 112 if (sizeof(psi32) != len) 113 return EINVAL; 114 115 psi32.psi_lwpid = psi->psi_lwpid; 116 netbsd32_si_to_si32(&psi32.psi_siginfo, &psi->psi_siginfo); 117 return copyout(&psi32, addr, sizeof(psi32)); 118 } 119 120 static int 121 netbsd32_doregs(struct lwp *curl /*tracer*/, 122 struct lwp *l /*traced*/, 123 struct uio *uio) 124 { 125 #if defined(PT_GETREGS) || defined(PT_SETREGS) 126 process_reg32 r32; 127 int error; 128 char *kv; 129 int kl; 130 131 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 132 return EINVAL; 133 134 kl = sizeof(r32); 135 kv = (char *)&r32; 136 137 kv += uio->uio_offset; 138 kl -= uio->uio_offset; 139 if ((size_t)kl > uio->uio_resid) 140 kl = uio->uio_resid; 141 error = process_read_regs32(l, &r32); 142 if (error == 0) 143 error = uiomove(kv, kl, uio); 144 if (error == 0 && uio->uio_rw == UIO_WRITE) { 145 if (l->l_stat != LSSTOP) 146 error = EBUSY; 147 else 148 error = process_write_regs32(l, &r32); 149 } 150 151 uio->uio_offset = 0; 152 return error; 153 #else 154 return EINVAL; 155 #endif 156 } 157 158 static int 159 netbsd32_dofpregs(struct lwp *curl /*tracer*/, 160 struct lwp *l /*traced*/, 161 struct uio *uio) 162 { 163 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 164 process_fpreg32 r32; 165 int error; 166 char *kv; 167 size_t kl; 168 169 KASSERT(l->l_proc->p_flag & PK_32); 170 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 171 return EINVAL; 172 kl = sizeof(r32); 173 kv = (char *)&r32; 174 175 kv += uio->uio_offset; 176 kl -= uio->uio_offset; 177 if (kl > uio->uio_resid) 178 kl = uio->uio_resid; 179 180 error = process_read_fpregs32(l, &r32, &kl); 181 if (error == 0) 182 error = uiomove(kv, kl, uio); 183 if (error == 0 && uio->uio_rw == UIO_WRITE) { 184 if (l->l_stat != LSSTOP) 185 error = EBUSY; 186 else 187 error = process_write_fpregs32(l, &r32, kl); 188 } 189 uio->uio_offset = 0; 190 return error; 191 #else 192 return EINVAL; 193 #endif 194 } 195 196 static int 197 netbsd32_dodbregs(struct lwp *curl /*tracer*/, 198 struct lwp *l /*traced*/, 199 struct uio *uio) 200 { 201 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 202 process_dbreg32 r32; 203 int error; 204 char *kv; 205 size_t kl; 206 207 KASSERT(l->l_proc->p_flag & PK_32); 208 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 209 return EINVAL; 210 kl = sizeof(r32); 211 kv = (char *)&r32; 212 213 kv += uio->uio_offset; 214 kl -= uio->uio_offset; 215 if (kl > uio->uio_resid) 216 kl = uio->uio_resid; 217 218 error = process_read_dbregs32(l, &r32, &kl); 219 if (error == 0) 220 error = uiomove(kv, kl, uio); 221 if (error == 0 && uio->uio_rw == UIO_WRITE) { 222 if (l->l_stat != LSSTOP) 223 error = EBUSY; 224 else 225 error = process_write_dbregs32(l, &r32, kl); 226 } 227 uio->uio_offset = 0; 228 return error; 229 #else 230 return EINVAL; 231 #endif 232 } 233 234 static struct ptrace_methods netbsd32_ptm = { 235 .ptm_copyin_piod = netbsd32_copyin_piod, 236 .ptm_copyout_piod = netbsd32_copyout_piod, 237 .ptm_copyin_siginfo = netbsd32_copyin_siginfo, 238 .ptm_copyout_siginfo = netbsd32_copyout_siginfo, 239 .ptm_doregs = netbsd32_doregs, 240 .ptm_dofpregs = netbsd32_dofpregs, 241 .ptm_dodbregs = netbsd32_dodbregs 242 }; 243 244 245 int 246 netbsd32_ptrace(struct lwp *l, const struct netbsd32_ptrace_args *uap, 247 register_t *retval) 248 { 249 /* { 250 syscallarg(int) req; 251 syscallarg(pid_t) pid; 252 syscallarg(netbsd32_voidp *) addr; 253 syscallarg(int) data; 254 } */ 255 256 return do_ptrace(&netbsd32_ptm, l, SCARG(uap, req), SCARG(uap, pid), 257 SCARG_P32(uap, addr), SCARG(uap, data), retval); 258 } 259 260 static const struct syscall_package compat_ptrace_syscalls[] = { 261 { NETBSD32_SYS_netbsd32_ptrace, 0, (sy_call_t *)netbsd32_ptrace }, 262 { 0, 0, NULL }, 263 }; 264 265 #define DEPS "compat_netbsd32,ptrace_common" 266 267 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_ptrace, DEPS); 268 269 static int 270 compat_netbsd32_ptrace_modcmd(modcmd_t cmd, void *arg) 271 { 272 int error; 273 274 switch (cmd) { 275 case MODULE_CMD_INIT: 276 error = syscall_establish(&emul_netbsd32, 277 compat_ptrace_syscalls); 278 break; 279 case MODULE_CMD_FINI: 280 error = syscall_disestablish(&emul_netbsd32, 281 compat_ptrace_syscalls); 282 break; 283 default: 284 error = ENOTTY; 285 break; 286 } 287 return error; 288 } 289