projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 813fb2f6 A |
1 | /* |
| 2 | * testname: pwrite_avoid_sigxfsz_28581610 | |
| 3 | */ | |
| 4 | ||
| 5 | #include <darwintest.h> | |
| 6 | #include <fcntl.h> | |
| 7 | #include <limits.h> | |
| 8 | #include <setjmp.h> | |
| 9 | #include <signal.h> | |
| 10 | #include <sys/resource.h> | |
| 11 | #include <sys/stat.h> | |
| 12 | #include <unistd.h> | |
| 13 | ||
| 14 | #define TMP_FILE_PATH "/tmp/test_pwrite" | |
| 15 | ||
| 16 | static sigjmp_buf xfsz_jmpbuf; | |
| 17 | ||
| 18 | void xfsz_signal(int); | |
| 19 | ||
| 20 | void | |
| 21 | xfsz_signal(__unused int signo) | |
| 22 | { | |
| 23 | siglongjmp(xfsz_jmpbuf, 1); | |
| 24 | } | |
| 25 | ||
| 26 | T_DECL(pwrite, "Tests avoiding SIGXFSZ with pwrite and odd offsets", | |
| 27 | T_META_ASROOT(true)) | |
| 28 | { | |
| 29 | int fd, x; | |
| 30 | off_t ret; | |
| 31 | struct stat f_stat; | |
| 32 | struct rlimit crl; | |
| 33 | static const int offs[] = { -1, -1 * 1024, -1 * 1024 * 16, -1 * 1024 * 1024 * 16, 0 }; | |
| 34 | static unsigned char buffer[1048576]; | |
| 35 | ||
| 36 | T_SETUPBEGIN; | |
| 37 | /* We expect zero SIGXFSZ signals because we have no file size limits */ | |
| 38 | crl.rlim_cur = crl.rlim_max = RLIM_INFINITY; | |
| 39 | ret = setrlimit(RLIMIT_FSIZE, &crl); | |
| 40 | T_ASSERT_POSIX_SUCCESS(ret, "setting infinite file size limit"); | |
| 41 | ||
| 42 | /* we just needed root to setup unlimited file size */ | |
| 43 | remove(TMP_FILE_PATH); | |
| 44 | setuid(5000); | |
| 45 | ||
| 46 | /* We just want an empty regular file to test with */ | |
| 47 | fd = open(TMP_FILE_PATH, O_RDWR | O_CREAT | O_EXCL, 0777); | |
| 48 | T_ASSERT_POSIX_SUCCESS(fd, "opening fd on temp file %s.", TMP_FILE_PATH); | |
| 49 | ||
| 50 | /* sanity check that this new file is really zero bytes in size */ | |
| 51 | ret = fstat(fd, &f_stat); | |
| 52 | T_ASSERT_POSIX_SUCCESS(ret, "stat() fd on temp file."); | |
| 53 | T_ASSERT_TRUE(0 == f_stat.st_size, "ensure %s is empty", TMP_FILE_PATH); | |
| 54 | ||
| 55 | /* sanity check that ftruncate() considers negative offsets an error */ | |
| 56 | for (x = 0; offs[x] != 0; x++) { | |
| 57 | ret = ftruncate(fd, offs[x]); | |
| 58 | T_ASSERT_TRUE(((ret == -1) && (errno == EINVAL)), | |
| 59 | "negative offset %d", offs[x]); | |
| 60 | } | |
| 61 | ||
| 62 | T_SETUPEND; | |
| 63 | ||
| 64 | /* we want to get the EFBIG errno but without a SIGXFSZ signal */ | |
| 65 | T_EXPECTFAIL; | |
| 66 | if (!sigsetjmp(xfsz_jmpbuf, 1)) { | |
| 67 | signal(SIGXFSZ, xfsz_signal); | |
| 68 | ret = pwrite(fd, buffer, sizeof buffer, LONG_MAX); | |
| 69 | T_ASSERT_TRUE(((ret == -1) && (errno == EFBIG)), | |
| 70 | "large offset %d", 13); | |
| 71 | } else { | |
| 72 | signal(SIGXFSZ, SIG_DFL); | |
| 73 | T_FAIL("%s unexpected SIGXFSZ with offset %lX", | |
| 74 | "<rdar://problem/28581610>", LONG_MAX); | |
| 75 | } | |
| 76 | ||
| 77 | /* Negative offsets are invalid, no SIGXFSZ signals required */ | |
| 78 | for (x = 0; offs[x] != 0; x++) { | |
| 79 | /* only -1 gives the correct result */ | |
| 80 | if (-1 != offs[x]) { | |
| 81 | T_EXPECTFAIL; | |
| 82 | } | |
| 83 | ||
| 84 | if (!sigsetjmp(xfsz_jmpbuf, 1)) { | |
| 85 | signal(SIGXFSZ, xfsz_signal); | |
| 86 | ret = pwrite(fd, buffer, sizeof buffer, offs[x]); | |
| 87 | T_ASSERT_TRUE(((ret == -1) && (errno == EINVAL)), | |
| 88 | "negative offset %d", offs[x]); | |
| 89 | } else { | |
| 90 | signal(SIGXFSZ, SIG_DFL); | |
| 91 | T_FAIL("%s unexpected SIGXFSZ with negative offset %d", | |
| 92 | "<rdar://problem/28581610>", offs[x]); | |
| 93 | } | |
| 94 | } | |
| 95 | ||
| 96 | remove(TMP_FILE_PATH); | |
| 97 | } |