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