pathtrace.c revision 1ba85436def7da80971aeb902fbc6e52997a46fa
18a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 28a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Copyright (c) 2011, Comtrol Corp. 38a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * All rights reserved. 48a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * 58a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Redistribution and use in source and binary forms, with or without 68a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * modification, are permitted provided that the following conditions 78a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * are met: 88a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * 1. Redistributions of source code must retain the above copyright 98a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * notice, this list of conditions and the following disclaimer. 108a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * 2. Redistributions in binary form must reproduce the above copyright 118a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * notice, this list of conditions and the following disclaimer in the 128a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * documentation and/or other materials provided with the distribution. 138a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * 3. The name of the author may not be used to endorse or promote products 148a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * derived from this software without specific prior written permission. 158a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * 168a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 178a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 188a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 198a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 208a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 218a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 228a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 238a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 248a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 258a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 268a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * 278a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 288a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 298a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#include "defs.h" 30b038a43d756c84f98868557a1bbacd048faf1e53Dmitry V. Levin#include <sys/param.h> 318a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#ifdef HAVE_POLL_H 32a6d91ded3f2d5401e09a9c2fa442aabfbfe593a8Denys Vlasenko# include <poll.h> 338a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#endif 348a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#ifdef HAVE_SYS_POLL_H 35a6d91ded3f2d5401e09a9c2fa442aabfbfe593a8Denys Vlasenko# include <sys/poll.h> 368a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#endif 378a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 388a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#include "syscall.h" 398a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 408a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards#define MAXSELECTED 256 /* max number of "selected" paths */ 418a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsstatic const char *selected[MAXSELECTED]; /* paths selected for tracing */ 428a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 438a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 448a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Return true if specified path matches one that we're tracing. 458a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 468a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsstatic int 478a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardspathmatch(const char *path) 488a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 49fcda7a5f4fcfbedb5493bbfc1b37e53c6b3a575cDmitry V. Levin unsigned int i; 508a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 517b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko for (i = 0; i < ARRAY_SIZE(selected); ++i) { 528a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (selected[i] == NULL) 538a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 5429865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko if (strcmp(path, selected[i]) == 0) 558a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 1; 568a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 578a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 588a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 598a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 608a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 618a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Return true if specified path (in user-space) matches. 628a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 638a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsstatic int 648a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsupathmatch(struct tcb *tcp, unsigned long upath) 658a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 667b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko char path[PATH_MAX + 1]; 678a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 686cecba53225ae30f1a28ce6954fb0cda847f3688Denys Vlasenko return umovestr(tcp, upath, sizeof path, path) >= 0 && 698a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards pathmatch(path); 708a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 718a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 728a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 738a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Return true if specified fd maps to a path we're tracing. 748a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 758a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsstatic int 768a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsfdmatch(struct tcb *tcp, int fd) 778a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 788a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards const char *path = getfdpath(tcp, fd); 798a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 808a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return path && pathmatch(path); 818a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 828a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 838a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 848a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Add a path to the set we're tracing. 858a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Secifying NULL will delete all paths. 868a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 878a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsstatic int 888a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsstorepath(const char *path) 898a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 90fcda7a5f4fcfbedb5493bbfc1b37e53c6b3a575cDmitry V. Levin unsigned int i; 918a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 9229865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko for (i = 0; i < ARRAY_SIZE(selected); ++i) { 937b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko if (!selected[i]) { 948a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards selected[i] = path; 958a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 968a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 9729865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko } 988a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 99fcda7a5f4fcfbedb5493bbfc1b37e53c6b3a575cDmitry V. Levin fprintf(stderr, "Max trace paths exceeded, only using first %u\n", 100fcda7a5f4fcfbedb5493bbfc1b37e53c6b3a575cDmitry V. Levin (unsigned int) ARRAY_SIZE(selected)); 1018a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return -1; 1028a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 1038a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1048a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 1058a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Get path associated with fd. 1068a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 10729865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenkoconst char * 10829865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenkogetfdpath(struct tcb *tcp, int fd) 1098a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 1108a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards static char path[PATH_MAX+1]; 111384b0ada7d821f3797bf5d72dcf096032d662193Denys Vlasenko char linkpath[sizeof("/proc/%u/fd/%u") + 2 * sizeof(int)*3]; 1128a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards ssize_t n; 1138a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1148a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (fd < 0) 1158a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return NULL; 1168a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 11729865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko sprintf(linkpath, "/proc/%u/fd/%u", tcp->pid, fd); 1188a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards n = readlink(linkpath, path, (sizeof path) - 1); 1198a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (n <= 0) 1208a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return NULL; 1218a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards path[n] = '\0'; 1228a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return path; 1238a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 1248a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1258a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 1268a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Add a path to the set we're tracing. Also add the canonicalized 1278a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * version of the path. Secifying NULL will delete all paths. 1288a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 1298a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsint 1308a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardspathtrace_select(const char *path) 1318a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 13229865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko char *rpath; 1338a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1348a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (storepath(path)) 1358a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return -1; 1368a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1378a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards rpath = realpath(path, NULL); 1388a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1398a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (rpath == NULL) 1408a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 1418a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1428a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* if realpath and specified path are same, we're done */ 14329865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko if (strcmp(path, rpath) == 0) { 1448a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards free(rpath); 1458a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 1468a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 1478a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1488a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fprintf(stderr, "Requested path '%s' resolved into '%s'\n", 1498a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards path, rpath); 1508a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return storepath(rpath); 1518a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 1528a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1538a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* 1548a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Return true if syscall accesses a selected path 1558a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * (or if no paths have been specified for tracing). 1568a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 1578a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardsint 1588a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwardspathtrace_match(struct tcb *tcp) 1598a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards{ 1608a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards const struct sysent *s; 1618a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1628a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (selected[0] == NULL) 1638a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 1; 1648a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1655721cdbcdba76eef854a30e7e56e328eae976e44Denys Vlasenko if (!SCNO_IS_VALID(tcp->scno)) 166bdec9cbcebd256dbebf8fd2f7e35dec55b8bd5aeDmitry V. Levin return 0; 167bdec9cbcebd256dbebf8fd2f7e35dec55b8bd5aeDmitry V. Levin 1688a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s = &sysent[tcp->scno]; 1698a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1708a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (!(s->sys_flags & (TRACE_FILE | TRACE_DESC))) 1718a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 1728a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1738a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* 1748a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Check for special cases where we need to do something 1758a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * other than test arg[0]. 1768a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 1778a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1788a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == sys_dup2 || 1798a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_dup3 || 1808a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_sendfile || 1818a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_sendfile64 || 182ad178c0dc050a0bd68179ca60f3aebe0ff6ddd89Dmitry V. Levin s->sys_func == sys_tee) 1838a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 1848a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* fd, fd */ 1858a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[0]) || 1868a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fdmatch(tcp, tcp->u_arg[1]); 1878a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 1888a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 1898a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == sys_inotify_add_watch || 1908a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_faccessat || 1918a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_fchmodat || 1928a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_futimesat || 1938a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_mkdirat || 1948a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_unlinkat || 1958a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_newfstatat || 1968a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_mknodat || 1978a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_openat || 1988a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_readlinkat || 1998a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_utimensat || 2008a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_fchownat || 201b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko s->sys_func == sys_pipe2) 2028a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 2038a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* fd, path */ 2048a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[0]) || 2058a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards upathmatch(tcp, tcp->u_arg[1]); 2068a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2078a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2088a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == sys_link || 209b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko s->sys_func == sys_mount) 2108a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 2118a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* path, path */ 2128a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return upathmatch(tcp, tcp->u_arg[0]) || 2138a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards upathmatch(tcp, tcp->u_arg[1]); 2148a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2158a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2167943966f6cd137e44f27d56aaf21b023fb1fae63Dmitry V. Levin if (s->sys_func == sys_quotactl) 2177943966f6cd137e44f27d56aaf21b023fb1fae63Dmitry V. Levin { 2187943966f6cd137e44f27d56aaf21b023fb1fae63Dmitry V. Levin /* x, path */ 2197943966f6cd137e44f27d56aaf21b023fb1fae63Dmitry V. Levin return upathmatch(tcp, tcp->u_arg[1]); 2207943966f6cd137e44f27d56aaf21b023fb1fae63Dmitry V. Levin } 2217943966f6cd137e44f27d56aaf21b023fb1fae63Dmitry V. Levin 2228a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == sys_renameat || 223b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko s->sys_func == sys_linkat) 2248a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 2258a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* fd, path, fd, path */ 2268a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[0]) || 2278a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fdmatch(tcp, tcp->u_arg[2]) || 2288a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards upathmatch(tcp, tcp->u_arg[1]) || 2298a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards upathmatch(tcp, tcp->u_arg[3]); 2308a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2318a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 23235be58119e3727a694d8c9f9b83f372401fcc4c0H.J. Lu if ( 23335be58119e3727a694d8c9f9b83f372401fcc4c0H.J. Lu s->sys_func == sys_old_mmap || 2341ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko#if defined(S390) 2351ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko s->sys_func == sys_old_mmap_pgoff || 2361ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko#endif 2371ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko s->sys_func == sys_mmap || 2381ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko s->sys_func == sys_mmap_pgoff || 2391ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko s->sys_func == sys_mmap_4koff 2401ba85436def7da80971aeb902fbc6e52997a46faDenys Vlasenko ) { 2418a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* x, x, x, x, fd */ 2428a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[4]); 2438a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2448a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2457b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko if (s->sys_func == sys_symlinkat) { 2468a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* path, fd, path */ 2478a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[1]) || 2488a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards upathmatch(tcp, tcp->u_arg[0]) || 249b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko upathmatch(tcp, tcp->u_arg[2]); 2508a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2518a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 252ad178c0dc050a0bd68179ca60f3aebe0ff6ddd89Dmitry V. Levin if (s->sys_func == sys_splice) { 2538a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* fd, x, fd, x, x */ 2548a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[0]) || 2558a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fdmatch(tcp, tcp->u_arg[2]); 2568a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2578a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2587b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko if (s->sys_func == sys_epoll_ctl) { 2598a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* x, x, fd, x */ 2608a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[2]); 2618a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2628a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2638a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == sys_select || 2648a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_oldselect || 265b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko s->sys_func == sys_pselect6) 2668a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 26779a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko int i, j; 26879a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko unsigned nfds; 2698a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards long *args, oldargs[5]; 2708a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards unsigned fdsize; 2718a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fd_set *fds; 2728a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2737b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko if (s->sys_func == sys_oldselect) { 2748a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (umoven(tcp, tcp->u_arg[0], sizeof oldargs, 2758a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards (char*) oldargs) < 0) 2768a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 2778a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fprintf(stderr, "umoven() failed\n"); 2788a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 2798a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 2808a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards args = oldargs; 2818a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } else 2828a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards args = tcp->u_arg; 2838a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2848a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards nfds = args[0]; 28579a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko /* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */ 28679a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko if (args[0] > 1024*1024) 28779a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko nfds = 1024*1024; 28879a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko if (args[0] < 0) 28979a79ea851250a30005d6323b20a9e30d9f336c1Denys Vlasenko nfds = 0; 2908a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fdsize = ((((nfds + 7) / 8) + sizeof(long) - 1) 2918a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards & -sizeof(long)); 2928a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fds = malloc(fdsize); 2931d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (!fds) 2941d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 2958a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 2967b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko for (i = 1; i <= 3; ++i) { 2978a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (args[i] == 0) 2988a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards continue; 2998a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3007b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko if (umoven(tcp, args[i], fdsize, (char *) fds) < 0) { 3018a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards fprintf(stderr, "umoven() failed\n"); 3028a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards continue; 3038a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 3048a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3058a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards for (j = 0; j < nfds; ++j) 3067b609d5ba0852e6c56ba311350ebd4412361777bDenys Vlasenko if (FD_ISSET(j, fds) && fdmatch(tcp, j)) { 3078a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards free(fds); 3088a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 1; 3098a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 3108a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 3118a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards free(fds); 3128a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 3138a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 3148a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3158a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == sys_poll || 316b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko s->sys_func == sys_ppoll) 3178a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 3188a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards struct pollfd fds; 3198a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards unsigned nfds; 3208a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards unsigned long start, cur, end; 3218a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3228a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards start = tcp->u_arg[0]; 3238a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards nfds = tcp->u_arg[1]; 3248a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3258a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards end = start + sizeof(fds) * nfds; 3268a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3278a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (nfds == 0 || end < start) 3288a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 3298a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3308a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards for (cur = start; cur < end; cur += sizeof(fds)) 3318a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if ((umoven(tcp, cur, sizeof fds, (char *) &fds) == 0) 3328a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards && fdmatch(tcp, fds.fd)) 3338a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 1; 3348a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3358a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 3368a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 3378a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3388a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_func == printargs || 3398a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_pipe || 3408a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_pipe2 || 3418a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_eventfd2 || 3428a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_eventfd || 3438a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_inotify_init1 || 3448a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_timerfd_create || 3458a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_timerfd_settime || 3468a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_timerfd_gettime || 3478a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards s->sys_func == sys_epoll_create || 34829865e77e6eee0c380befd0ce53657b5604975efDenys Vlasenko strcmp(s->sys_name, "fanotify_init") == 0) 3498a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards { 3508a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* 3518a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * These have TRACE_FILE or TRACE_DESCRIPTOR set, but they 3528a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * don't have any file descriptor or path args to test. 3538a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 3548a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 3558a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards } 3568a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3578a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards /* 3588a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * Our fallback position for calls that haven't already 3598a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards * been handled is to just check arg[0]. 3608a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards */ 3618a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3628a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_flags & TRACE_FILE) 3638a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return upathmatch(tcp, tcp->u_arg[0]); 3648a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3658a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards if (s->sys_flags & TRACE_DESC) 3668a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return fdmatch(tcp, tcp->u_arg[0]); 3678a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 3688a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards return 0; 3698a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards} 370