1 /* 2 * Check decoding of lookup_dcookie syscall. 3 * 4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "tests.h" 31 32 #include <asm/unistd.h> 33 34 #ifdef __NR_lookup_dcookie 35 36 # include <inttypes.h> 37 # include <limits.h> 38 # include <stdio.h> 39 # include <unistd.h> 40 41 static void 42 do_lookup_cookie(uint64_t cookie, char *buf, kernel_ulong_t len) 43 { 44 long rc; 45 const char *errstr; 46 47 # if (LONG_MAX > INT_MAX) \ 48 || (defined __x86_64__ && defined __ILP32__) \ 49 || defined LINUX_MIPSN32 50 rc = syscall(__NR_lookup_dcookie, cookie, buf, len); 51 # else 52 rc = syscall(__NR_lookup_dcookie, LL_VAL_TO_PAIR(cookie), buf, len); 53 # endif 54 55 errstr = sprintrc(rc); 56 printf("lookup_dcookie(%" PRIu64 ", ", cookie); 57 58 /* Here, we trust successful return code */ 59 if ((rc >= 0) && (rc < (long) INT_MAX)) { 60 printf("%.*s, ", (int) rc, buf); 61 } else { 62 if (buf != NULL) 63 printf("%p, ", buf); 64 else 65 printf("NULL, "); 66 } 67 68 printf("%" PRIu64 ") = %s\n", (uint64_t) len, errstr); 69 } 70 71 int 72 main(void) 73 { 74 enum { BUF_SIZE = 4096 }; 75 76 static const uint64_t bogus_cookie = 77 (uint64_t) 0xf157feeddeadfaceULL; 78 static const kernel_ulong_t bogus_len = 79 (kernel_ulong_t) 0xbadc0dedda7a1057ULL; 80 81 char *buf = tail_alloc(BUF_SIZE); 82 83 do_lookup_cookie(0, NULL, 0); 84 do_lookup_cookie(bogus_cookie, buf + BUF_SIZE, bogus_len); 85 do_lookup_cookie(bogus_cookie, buf, BUF_SIZE); 86 87 puts("+++ exited with 0 +++"); 88 89 return 0; 90 } 91 92 #else 93 94 SKIP_MAIN_UNDEFINED("__NR_lookup_dcookie"); 95 96 #endif 97