1 /* $NetBSD: netbsd32_ptrace.c,v 1.7 2019/06/04 16:29:53 mgorny 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 1.7 2019/06/04 16:29:53 mgorny 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 /* 55 * PTRACE methods 56 */ 57 58 static int 59 netbsd32_copyin_piod(struct ptrace_io_desc *piod, const void *addr, size_t len) 60 { 61 struct netbsd32_ptrace_io_desc piod32; 62 63 if (len != 0 && sizeof(piod32) != len) 64 return EINVAL; 65 66 int error = copyin(addr, &piod32, sizeof(piod32)); 67 if (error) 68 return error; 69 piod->piod_op = piod32.piod_op; 70 piod->piod_offs = NETBSD32PTR64(piod32.piod_offs); 71 piod->piod_addr = NETBSD32PTR64(piod32.piod_addr); 72 piod->piod_len = (size_t)piod32.piod_len; 73 74 return 0; 75 } 76 77 static int 78 netbsd32_copyout_piod(const struct ptrace_io_desc *piod, void *addr, size_t len) 79 { 80 struct netbsd32_ptrace_io_desc piod32; 81 82 if (len != 0 && sizeof(piod32) != len) 83 return EINVAL; 84 85 piod32.piod_op = piod->piod_op; 86 NETBSD32PTR32(piod32.piod_offs, piod->piod_offs); 87 NETBSD32PTR32(piod32.piod_addr, piod->piod_addr); 88 piod32.piod_len = (netbsd32_size_t)piod->piod_len; 89 return copyout(&piod32, addr, sizeof(piod32)); 90 } 91 92 static int 93 netbsd32_copyin_siginfo(struct ptrace_siginfo *psi, const void *addr, size_t len) 94 { 95 struct netbsd32_ptrace_siginfo psi32; 96 97 if (sizeof(psi32) != len) 98 return EINVAL; 99 100 int error = copyin(addr, &psi32, sizeof(psi32)); 101 if (error) 102 return error; 103 psi->psi_lwpid = psi32.psi_lwpid; 104 netbsd32_si32_to_si(&psi->psi_siginfo, &psi32.psi_siginfo); 105 return 0; 106 } 107 108 static int 109 netbsd32_copyout_siginfo(const struct ptrace_siginfo *psi, void *addr, size_t len) 110 { 111 struct netbsd32_ptrace_siginfo psi32; 112 113 if (sizeof(psi32) != len) 114 return EINVAL; 115 116 psi32.psi_lwpid = psi->psi_lwpid; 117 netbsd32_si_to_si32(&psi32.psi_siginfo, &psi->psi_siginfo); 118 return copyout(&psi32, addr, sizeof(psi32)); 119 } 120 121 static int 122 netbsd32_doregs(struct lwp *curl /*tracer*/, 123 struct lwp *l /*traced*/, 124 struct uio *uio) 125 { 126 #if defined(PT_GETREGS) || defined(PT_SETREGS) 127 process_reg32 r32; 128 int error; 129 char *kv; 130 int kl; 131 132 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 133 return EINVAL; 134 135 kl = sizeof(r32); 136 kv = (char *)&r32; 137 138 kv += uio->uio_offset; 139 kl -= uio->uio_offset; 140 if ((size_t)kl > uio->uio_resid) 141 kl = uio->uio_resid; 142 error = process_read_regs32(l, &r32); 143 if (error == 0) 144 error = uiomove(kv, kl, uio); 145 if (error == 0 && uio->uio_rw == UIO_WRITE) { 146 if (l->l_stat != LSSTOP) 147 error = EBUSY; 148 else 149 error = process_write_regs32(l, &r32); 150 } 151 152 uio->uio_offset = 0; 153 return error; 154 #else 155 return EINVAL; 156 #endif 157 } 158 159 static int 160 netbsd32_dofpregs(struct lwp *curl /*tracer*/, 161 struct lwp *l /*traced*/, 162 struct uio *uio) 163 { 164 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 165 process_fpreg32 r32; 166 int error; 167 char *kv; 168 size_t kl; 169 170 KASSERT(l->l_proc->p_flag & PK_32); 171 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 172 return EINVAL; 173 kl = sizeof(r32); 174 kv = (char *)&r32; 175 176 kv += uio->uio_offset; 177 kl -= uio->uio_offset; 178 if (kl > uio->uio_resid) 179 kl = uio->uio_resid; 180 181 error = process_read_fpregs32(l, &r32, &kl); 182 if (error == 0) 183 error = uiomove(kv, kl, uio); 184 if (error == 0 && uio->uio_rw == UIO_WRITE) { 185 if (l->l_stat != LSSTOP) 186 error = EBUSY; 187 else 188 error = process_write_fpregs32(l, &r32, kl); 189 } 190 uio->uio_offset = 0; 191 return error; 192 #else 193 return EINVAL; 194 #endif 195 } 196 197 static int 198 netbsd32_dodbregs(struct lwp *curl /*tracer*/, 199 struct lwp *l /*traced*/, 200 struct uio *uio) 201 { 202 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 203 process_dbreg32 r32; 204 int error; 205 char *kv; 206 size_t kl; 207 208 KASSERT(l->l_proc->p_flag & PK_32); 209 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) 210 return EINVAL; 211 kl = sizeof(r32); 212 kv = (char *)&r32; 213 214 kv += uio->uio_offset; 215 kl -= uio->uio_offset; 216 if (kl > uio->uio_resid) 217 kl = uio->uio_resid; 218 219 error = process_read_dbregs32(l, &r32, &kl); 220 if (error == 0) 221 error = uiomove(kv, kl, uio); 222 if (error == 0 && uio->uio_rw == UIO_WRITE) { 223 if (l->l_stat != LSSTOP) 224 error = EBUSY; 225 else 226 error = process_write_dbregs32(l, &r32, kl); 227 } 228 uio->uio_offset = 0; 229 return error; 230 #else 231 return EINVAL; 232 #endif 233 } 234 235 static struct ptrace_methods netbsd32_ptm = { 236 .ptm_copyin_piod = netbsd32_copyin_piod, 237 .ptm_copyout_piod = netbsd32_copyout_piod, 238 .ptm_copyin_siginfo = netbsd32_copyin_siginfo, 239 .ptm_copyout_siginfo = netbsd32_copyout_siginfo, 240 .ptm_doregs = netbsd32_doregs, 241 .ptm_dofpregs = netbsd32_dofpregs, 242 .ptm_dodbregs = netbsd32_dodbregs 243 }; 244 245 246 int 247 netbsd32_ptrace(struct lwp *l, const struct netbsd32_ptrace_args *uap, 248 register_t *retval) 249 { 250 int req; 251 252 /* { 253 syscallarg(int) req; 254 syscallarg(pid_t) pid; 255 syscallarg(netbsd32_voidp *) addr; 256 syscallarg(int) data; 257 } */ 258 259 req = PTRACE_TRANSLATE_REQUEST32(SCARG(uap, req)); 260 if (req == -1) 261 return EOPNOTSUPP; 262 263 return do_ptrace(&netbsd32_ptm, l, req, SCARG(uap, pid), 264 SCARG_P32(uap, addr), SCARG(uap, data), retval); 265 } 266 267 static const struct syscall_package compat_ptrace_syscalls[] = { 268 { NETBSD32_SYS_netbsd32_ptrace, 0, (sy_call_t *)netbsd32_ptrace }, 269 { 0, 0, NULL }, 270 }; 271 272 #define DEPS "compat_netbsd32,ptrace_common" 273 274 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_ptrace, DEPS); 275 276 static int 277 compat_netbsd32_ptrace_modcmd(modcmd_t cmd, void *arg) 278 { 279 int error; 280 281 switch (cmd) { 282 case MODULE_CMD_INIT: 283 error = syscall_establish(&emul_netbsd32, 284 compat_ptrace_syscalls); 285 break; 286 case MODULE_CMD_FINI: 287 error = syscall_disestablish(&emul_netbsd32, 288 compat_ptrace_syscalls); 289 break; 290 default: 291 error = ENOTTY; 292 break; 293 } 294 return error; 295 } 296