1/* 2 * Copyright (c) 1994-1996 Rick Sladkey <jrs@world.std.com> 3 * Copyright (c) 1996-2000 Wichert Akkerman <wichert@cistron.nl> 4 * Copyright (c) 2005-2007 Roland McGrath <roland@redhat.com> 5 * Copyright (c) 2008-2015 Dmitry V. Levin <ldv@altlinux.org> 6 * Copyright (c) 2014-2017 The strace developers. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "defs.h" 33 34#include <linux/prctl.h> 35 36#include "xlat/prctl_options.h" 37#include "xlat/pr_cap_ambient.h" 38#include "xlat/pr_dumpable.h" 39#include "xlat/pr_fp_mode.h" 40#include "xlat/pr_mce_kill.h" 41#include "xlat/pr_mce_kill_policy.h" 42#include "xlat/pr_set_mm.h" 43#include "xlat/pr_tsc.h" 44#include "xlat/pr_unalign_flags.h" 45 46#ifndef TASK_COMM_LEN 47# define TASK_COMM_LEN 16 48#endif 49 50#ifdef HAVE_LINUX_SECCOMP_H 51# include <linux/seccomp.h> 52#endif 53#include "xlat/seccomp_mode.h" 54 55#ifdef HAVE_LINUX_SECUREBITS_H 56# include <linux/securebits.h> 57#endif 58#include "xlat/secbits.h" 59 60/* these constants are the same as in <linux/capability.h> */ 61enum { 62#include "caps0.h" 63#include "caps1.h" 64}; 65 66#include "xlat/cap.h" 67 68static void 69print_prctl_args(struct tcb *tcp, const unsigned int first) 70{ 71 unsigned int i; 72 73 for (i = first; i < tcp->s_ent->nargs; ++i) 74 tprintf(", %#" PRI_klx, tcp->u_arg[i]); 75} 76 77SYS_FUNC(prctl) 78{ 79 const unsigned int option = tcp->u_arg[0]; 80 const kernel_ulong_t arg2 = tcp->u_arg[1]; 81 const kernel_ulong_t arg3 = tcp->u_arg[2]; 82 /* 83 * PR_SET_VMA is the only command which actually uses these arguments 84 * currently, and it is available only on Android for now. 85 */ 86#ifdef __ANDROID__ 87 const kernel_ulong_t arg4 = tcp->u_arg[3]; 88 const kernel_ulong_t arg5 = tcp->u_arg[4]; 89#endif 90 unsigned int i; 91 92 if (entering(tcp)) 93 printxval(prctl_options, option, "PR_???"); 94 95 switch (option) { 96 case PR_GET_KEEPCAPS: 97 case PR_GET_SECCOMP: 98 case PR_GET_TIMERSLACK: 99 case PR_GET_TIMING: 100 return RVAL_DECODED; 101 102 case PR_GET_CHILD_SUBREAPER: 103 case PR_GET_ENDIAN: 104 case PR_GET_FPEMU: 105 case PR_GET_FPEXC: 106 if (entering(tcp)) 107 tprints(", "); 108 else 109 printnum_int(tcp, arg2, "%u"); 110 break; 111 112 case PR_GET_DUMPABLE: 113 if (entering(tcp)) 114 break; 115 if (syserror(tcp)) 116 return 0; 117 tcp->auxstr = xlookup(pr_dumpable, (kernel_ulong_t) tcp->u_rval); 118 return RVAL_STR; 119 120 case PR_GET_NAME: 121 if (entering(tcp)) { 122 tprints(", "); 123 } else { 124 if (syserror(tcp)) 125 printaddr(arg2); 126 else 127 printstr_ex(tcp, arg2, TASK_COMM_LEN, 128 QUOTE_0_TERMINATED); 129 } 130 break; 131 132 case PR_GET_PDEATHSIG: 133 if (entering(tcp)) { 134 tprints(", "); 135 } else if (!umove_or_printaddr(tcp, arg2, &i)) { 136 tprints("["); 137 tprints(signame(i)); 138 tprints("]"); 139 } 140 break; 141 142 case PR_GET_SECUREBITS: 143 if (entering(tcp)) 144 break; 145 if (syserror(tcp) || tcp->u_rval == 0) 146 return 0; 147 tcp->auxstr = sprintflags("", secbits, 148 (kernel_ulong_t) tcp->u_rval); 149 return RVAL_STR; 150 151 case PR_GET_TID_ADDRESS: 152 if (entering(tcp)) 153 tprints(", "); 154 else 155 printnum_kptr(tcp, arg2); 156 break; 157 158 case PR_GET_TSC: 159 if (entering(tcp)) { 160 tprints(", "); 161 } else if (!umove_or_printaddr(tcp, arg2, &i)) { 162 tprints("["); 163 printxval(pr_tsc, i, "PR_TSC_???"); 164 tprints("]"); 165 } 166 break; 167 168 case PR_GET_UNALIGN: 169 if (entering(tcp)) { 170 tprints(", "); 171 } else if (!umove_or_printaddr(tcp, arg2, &i)) { 172 tprints("["); 173 printflags(pr_unalign_flags, i, "PR_UNALIGN_???"); 174 tprints("]"); 175 } 176 break; 177 178 case PR_GET_FP_MODE: 179 if (entering(tcp)) 180 break; 181 if (syserror(tcp) || tcp->u_rval == 0) 182 return 0; 183 tcp->auxstr = sprintflags("", pr_fp_mode, 184 (kernel_ulong_t) tcp->u_rval); 185 return RVAL_STR; 186 187 /* PR_TASK_PERF_EVENTS_* take no arguments. */ 188 case PR_TASK_PERF_EVENTS_DISABLE: 189 case PR_TASK_PERF_EVENTS_ENABLE: 190 return RVAL_DECODED; 191 192 case PR_SET_CHILD_SUBREAPER: 193 case PR_SET_ENDIAN: 194 case PR_SET_FPEMU: 195 case PR_SET_FPEXC: 196 case PR_SET_KEEPCAPS: 197 case PR_SET_TIMING: 198 tprintf(", %" PRI_klu, arg2); 199 return RVAL_DECODED; 200 201 case PR_SET_DUMPABLE: 202 tprints(", "); 203 printxval64(pr_dumpable, arg2, "SUID_DUMP_???"); 204 return RVAL_DECODED; 205 206 case PR_CAPBSET_DROP: 207 case PR_CAPBSET_READ: 208 tprints(", "); 209 printxval64(cap, arg2, "CAP_???"); 210 return RVAL_DECODED; 211 212 case PR_CAP_AMBIENT: 213 tprints(", "); 214 printxval64(pr_cap_ambient, arg2, 215 "PR_CAP_AMBIENT_???"); 216 switch (arg2) { 217 case PR_CAP_AMBIENT_RAISE: 218 case PR_CAP_AMBIENT_LOWER: 219 case PR_CAP_AMBIENT_IS_SET: 220 tprints(", "); 221 printxval64(cap, arg3, "CAP_???"); 222 print_prctl_args(tcp, 3); 223 break; 224 default: 225 print_prctl_args(tcp, 2); 226 break; 227 } 228 return RVAL_DECODED; 229 230 case PR_MCE_KILL: 231 tprints(", "); 232 printxval64(pr_mce_kill, arg2, "PR_MCE_KILL_???"); 233 tprints(", "); 234 if (PR_MCE_KILL_SET == arg2) 235 printxval64(pr_mce_kill_policy, arg3, 236 "PR_MCE_KILL_???"); 237 else 238 tprintf("%#" PRI_klx, arg3); 239 print_prctl_args(tcp, 3); 240 return RVAL_DECODED; 241 242 case PR_SET_NAME: 243 tprints(", "); 244 printstr_ex(tcp, arg2, TASK_COMM_LEN - 1, 245 QUOTE_0_TERMINATED); 246 return RVAL_DECODED; 247 248#ifdef __ANDROID__ 249# ifndef PR_SET_VMA_ANON_NAME 250# define PR_SET_VMA_ANON_NAME 0 251# endif 252 case PR_SET_VMA: 253 if (arg2 == PR_SET_VMA_ANON_NAME) { 254 tprintf(", PR_SET_VMA_ANON_NAME, %#" PRI_klx, arg3); 255 tprintf(", %" PRI_klu ", ", arg4); 256 printstr(tcp, arg5); 257 } else { 258 /* There are no other sub-options now, but there 259 * might be in future... */ 260 print_prctl_args(tcp, 1); 261 } 262 return RVAL_DECODED; 263#endif 264 265 case PR_SET_MM: 266 tprints(", "); 267 printxval(pr_set_mm, arg2, "PR_SET_MM_???"); 268 print_prctl_args(tcp, 2); 269 return RVAL_DECODED; 270 271 case PR_SET_PDEATHSIG: 272 tprints(", "); 273 if (arg2 > 128) 274 tprintf("%" PRI_klu, arg2); 275 else 276 tprints(signame(arg2)); 277 return RVAL_DECODED; 278 279 case PR_SET_PTRACER: 280 tprints(", "); 281 if ((int) arg2 == -1) 282 tprints("PR_SET_PTRACER_ANY"); 283 else 284 tprintf("%" PRI_klu, arg2); 285 return RVAL_DECODED; 286 287 case PR_SET_SECCOMP: 288 tprints(", "); 289 printxval64(seccomp_mode, arg2, 290 "SECCOMP_MODE_???"); 291 if (SECCOMP_MODE_STRICT == arg2) 292 return RVAL_DECODED; 293 if (SECCOMP_MODE_FILTER == arg2) { 294 tprints(", "); 295 decode_seccomp_fprog(tcp, arg3); 296 return RVAL_DECODED; 297 } 298 print_prctl_args(tcp, 2); 299 return RVAL_DECODED; 300 301 case PR_SET_SECUREBITS: 302 tprints(", "); 303 printflags64(secbits, arg2, "SECBIT_???"); 304 return RVAL_DECODED; 305 306 case PR_SET_TIMERSLACK: 307 tprintf(", %" PRI_kld, arg2); 308 return RVAL_DECODED; 309 310 case PR_SET_TSC: 311 tprints(", "); 312 printxval(pr_tsc, arg2, "PR_TSC_???"); 313 return RVAL_DECODED; 314 315 case PR_SET_UNALIGN: 316 tprints(", "); 317 printflags(pr_unalign_flags, arg2, "PR_UNALIGN_???"); 318 return RVAL_DECODED; 319 320 case PR_SET_NO_NEW_PRIVS: 321 case PR_SET_THP_DISABLE: 322 tprintf(", %" PRI_klu, arg2); 323 print_prctl_args(tcp, 2); 324 return RVAL_DECODED; 325 326 case PR_MCE_KILL_GET: 327 if (entering(tcp)) { 328 print_prctl_args(tcp, 1); 329 return 0; 330 } 331 if (syserror(tcp)) 332 return 0; 333 tcp->auxstr = xlookup(pr_mce_kill_policy, 334 (kernel_ulong_t) tcp->u_rval); 335 return tcp->auxstr ? RVAL_STR : RVAL_UDECIMAL; 336 337 case PR_SET_FP_MODE: 338 tprints(", "); 339 printflags(pr_fp_mode, arg2, "PR_FP_MODE_???"); 340 return RVAL_DECODED; 341 342 case PR_GET_NO_NEW_PRIVS: 343 case PR_GET_THP_DISABLE: 344 case PR_MPX_DISABLE_MANAGEMENT: 345 case PR_MPX_ENABLE_MANAGEMENT: 346 default: 347 print_prctl_args(tcp, 1); 348 return RVAL_DECODED; 349 } 350 return 0; 351} 352 353#if defined X86_64 || defined X32 || defined I386 354# include "xlat/archvals.h" 355 356SYS_FUNC(arch_prctl) 357{ 358 const unsigned int option = tcp->u_arg[0]; 359 const kernel_ulong_t addr = tcp->u_arg[1]; 360 361 if (entering(tcp)) 362 printxval(archvals, option, "ARCH_???"); 363 364 switch (option) { 365 case ARCH_GET_GS: 366 case ARCH_GET_FS: 367 if (entering(tcp)) 368 tprints(", "); 369 else 370 printnum_ptr(tcp, addr); 371 return 0; 372 } 373 374 tprintf(", %#" PRI_klx, addr); 375 return RVAL_DECODED; 376} 377#endif /* X86_64 || X32 || I386 */ 378