1 /* $NetBSD: netbsd32_ptrace.c,v 1.8 2019/12/24 14:50:59 kamil 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 1.8 2019/12/24 14:50:59 kamil 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 #ifndef PTRACE_TRANSLATE_REQUEST32 51 #define PTRACE_TRANSLATE_REQUEST32(x) x 52 #endif 53 54 static void 55 netbsd32_lwpstatus_to_lwpstatus32(struct netbsd32_ptrace_lwpstatus *pls32, 56 const struct ptrace_lwpstatus *pls) 57 { 58 pls32->pl_lwpid = pls->pl_lwpid; 59 pls32->pl_sigpend = pls->pl_sigpend; 60 pls32->pl_sigmask = pls->pl_sigmask; 61 memcpy(&pls32->pl_name, &pls->pl_name, PL_LNAMELEN); 62 NETBSD32PTR32(pls32->pl_private, pls->pl_private); 63 } 64 65 void 66 netbsd32_read_lwpstatus(struct lwp *l, struct netbsd32_ptrace_lwpstatus *pls32) 67 { 68 struct ptrace_lwpstatus pls; 69 70 process_read_lwpstatus(l, &pls); 71 72 netbsd32_lwpstatus_to_lwpstatus32(pls32, &pls); 73 } 74 75 /* 76 * PTRACE methods 77 */ 78 79 static int 80 netbsd32_copyin_piod(struct ptrace_io_desc *piod, const void *addr, size_t len) 81 { 82 struct netbsd32_ptrace_io_desc piod32; 83 84 if (len != 0 && sizeof(piod32) != len) 85 return EINVAL; 86 87 int error = copyin(addr, &piod32, sizeof(piod32)); 88 if (error) 89 return error; 90 piod->piod_op = piod32.piod_op; 91 piod->piod_offs = NETBSD32PTR64(piod32.piod_offs); 92 piod->piod_addr = NETBSD32PTR64(piod32.piod_addr); 93 piod->piod_len = (size_t)piod32.piod_len; 94 95 return 0; 96 } 97 98 static int 99 netbsd32_copyout_piod(const struct ptrace_io_desc *piod, void *addr, size_t len) 100 { 101 struct netbsd32_ptrace_io_desc piod32; 102 103 if (len != 0 && sizeof(piod32) != len) 104 return EINVAL; 105 106 piod32.piod_op = piod->piod_op; 107 NETBSD32PTR32(piod32.piod_offs, piod->piod_offs); 108 NETBSD32PTR32(piod32.piod_addr, piod->piod_addr); 109 piod32.piod_len = (netbsd32_size_t)piod->piod_len; 110 return copyout(&piod32, addr, sizeof(piod32)); 111 } 112 113 static int 114 netbsd32_copyin_siginfo(struct ptrace_siginfo *psi, const void *addr, size_t len) 115 { 116 struct netbsd32_ptrace_siginfo psi32; 117 118 if (sizeof(psi32) != len) 119 return EINVAL; 120 121 int error = copyin(addr, &psi32, sizeof(psi32)); 122 if (error) 123 return error; 124 psi->psi_lwpid = psi32.psi_lwpid; 125 netbsd32_si32_to_si(&psi->psi_siginfo, &psi32.psi_siginfo); 126 return 0; 127 } 128 129 static int 130 netbsd32_copyout_siginfo(const struct ptrace_siginfo *psi, void *addr, size_t len) 131 { 132 struct netbsd32_ptrace_siginfo psi32; 133 134 if (sizeof(psi32) != len) 135 return EINVAL; 136 137 psi32.psi_lwpid = psi->psi_lwpid; 138 netbsd32_si_to_si32(&psi32.psi_siginfo, &psi->psi_siginfo); 139 return copyout(&psi32, addr, sizeof(psi32)); 140 } 141 142 static int 143 netbsd32_copyout_lwpstatus(const struct ptrace_lwpstatus *pls, void *addr, size_t len) 144 { 145 struct netbsd32_ptrace_lwpstatus pls32; 146 147 if (len > sizeof(pls32)) 148 return EINVAL; 149 150 netbsd32_lwpstatus_to_lwpstatus32(&pls32, pls); 151 152 return copyout(&pls32, addr, MIN(len, sizeof(pls32))); 153 } 154 155 static int 156 netbsd32_doregs(struct lwp *curl /*tracer*/, 157 struct lwp *l /*traced*/, 158 struct uio *uio) 159 { 160 #if defined(PT_GETREGS) || defined(PT_SETREGS) 161 process_reg32 r32; 162 int error; 163 char *kv; 164 int kl; 165 166 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 167 return EINVAL; 168 169 kl = sizeof(r32); 170 kv = (char *)&r32; 171 172 kv += uio->uio_offset; 173 kl -= uio->uio_offset; 174 if ((size_t)kl > uio->uio_resid) 175 kl = uio->uio_resid; 176 error = process_read_regs32(l, &r32); 177 if (error == 0) 178 error = uiomove(kv, kl, uio); 179 if (error == 0 && uio->uio_rw == UIO_WRITE) { 180 if (l->l_stat != LSSTOP) 181 error = EBUSY; 182 else 183 error = process_write_regs32(l, &r32); 184 } 185 186 uio->uio_offset = 0; 187 return error; 188 #else 189 return EINVAL; 190 #endif 191 } 192 193 static int 194 netbsd32_dofpregs(struct lwp *curl /*tracer*/, 195 struct lwp *l /*traced*/, 196 struct uio *uio) 197 { 198 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 199 process_fpreg32 r32; 200 int error; 201 char *kv; 202 size_t kl; 203 204 KASSERT(l->l_proc->p_flag & PK_32); 205 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 206 return EINVAL; 207 kl = sizeof(r32); 208 kv = (char *)&r32; 209 210 kv += uio->uio_offset; 211 kl -= uio->uio_offset; 212 if (kl > uio->uio_resid) 213 kl = uio->uio_resid; 214 215 error = process_read_fpregs32(l, &r32, &kl); 216 if (error == 0) 217 error = uiomove(kv, kl, uio); 218 if (error == 0 && uio->uio_rw == UIO_WRITE) { 219 if (l->l_stat != LSSTOP) 220 error = EBUSY; 221 else 222 error = process_write_fpregs32(l, &r32, kl); 223 } 224 uio->uio_offset = 0; 225 return error; 226 #else 227 return EINVAL; 228 #endif 229 } 230 231 static int 232 netbsd32_dodbregs(struct lwp *curl /*tracer*/, 233 struct lwp *l /*traced*/, 234 struct uio *uio) 235 { 236 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 237 process_dbreg32 r32; 238 int error; 239 char *kv; 240 size_t kl; 241 242 KASSERT(l->l_proc->p_flag & PK_32); 243 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 244 return EINVAL; 245 kl = sizeof(r32); 246 kv = (char *)&r32; 247 248 kv += uio->uio_offset; 249 kl -= uio->uio_offset; 250 if (kl > uio->uio_resid) 251 kl = uio->uio_resid; 252 253 error = process_read_dbregs32(l, &r32, &kl); 254 if (error == 0) 255 error = uiomove(kv, kl, uio); 256 if (error == 0 && uio->uio_rw == UIO_WRITE) { 257 if (l->l_stat != LSSTOP) 258 error = EBUSY; 259 else 260 error = process_write_dbregs32(l, &r32, kl); 261 } 262 uio->uio_offset = 0; 263 return error; 264 #else 265 return EINVAL; 266 #endif 267 } 268 269 static struct ptrace_methods netbsd32_ptm = { 270 .ptm_copyin_piod = netbsd32_copyin_piod, 271 .ptm_copyout_piod = netbsd32_copyout_piod, 272 .ptm_copyin_siginfo = netbsd32_copyin_siginfo, 273 .ptm_copyout_siginfo = netbsd32_copyout_siginfo, 274 .ptm_copyout_lwpstatus = netbsd32_copyout_lwpstatus, 275 .ptm_doregs = netbsd32_doregs, 276 .ptm_dofpregs = netbsd32_dofpregs, 277 .ptm_dodbregs = netbsd32_dodbregs 278 }; 279 280 281 int 282 netbsd32_ptrace(struct lwp *l, const struct netbsd32_ptrace_args *uap, 283 register_t *retval) 284 { 285 int req; 286 287 /* { 288 syscallarg(int) req; 289 syscallarg(pid_t) pid; 290 syscallarg(netbsd32_voidp *) addr; 291 syscallarg(int) data; 292 } */ 293 294 req = PTRACE_TRANSLATE_REQUEST32(SCARG(uap, req)); 295 if (req == -1) 296 return EOPNOTSUPP; 297 298 return do_ptrace(&netbsd32_ptm, l, req, SCARG(uap, pid), 299 SCARG_P32(uap, addr), SCARG(uap, data), retval); 300 } 301 302 static const struct syscall_package compat_ptrace_syscalls[] = { 303 { NETBSD32_SYS_netbsd32_ptrace, 0, (sy_call_t *)netbsd32_ptrace }, 304 { 0, 0, NULL }, 305 }; 306 307 #define DEPS "compat_netbsd32,ptrace_common" 308 309 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_ptrace, DEPS); 310 311 static int 312 compat_netbsd32_ptrace_modcmd(modcmd_t cmd, void *arg) 313 { 314 int error; 315 316 switch (cmd) { 317 case MODULE_CMD_INIT: 318 error = syscall_establish(&emul_netbsd32, 319 compat_ptrace_syscalls); 320 break; 321 case MODULE_CMD_FINI: 322 error = syscall_disestablish(&emul_netbsd32, 323 compat_ptrace_syscalls); 324 break; 325 default: 326 error = ENOTTY; 327 break; 328 } 329 return error; 330 } 331