diff options
Diffstat (limited to 'lib/util/regress/mktemp/mktemp_test.c')
| -rw-r--r-- | lib/util/regress/mktemp/mktemp_test.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/lib/util/regress/mktemp/mktemp_test.c b/lib/util/regress/mktemp/mktemp_test.c new file mode 100644 index 0000000..134f89e --- /dev/null +++ b/lib/util/regress/mktemp/mktemp_test.c @@ -0,0 +1,206 @@ +/* + * Copyright (c) 2010 Philip Guenther <guenther@openbsd.org> + * + * Public domain. + * + * Verify that mkdtemp() and mkstemps() doesn't overrun or underrun + * the template buffer and that it can generate names that don't + * contain any X's + */ + +#include <config.h> + +#include <sys/mman.h> +#include <sys/stat.h> + +#include <errno.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> + +#define SUDO_ERROR_WRAP 0 + +#include "sudo_compat.h" +#include "sudo_util.h" +#include "sudo_fatal.h" + +#ifndef MAP_ANON +# if defined(MAP_ANONYMOUS) +# define MAP_ANON MAP_ANONYMOUS +# endif +#endif + +#ifndef MAP_FAILED +# define MAP_FAILED ((void *) -1) +#endif + +#define MAX_TEMPLATE_LEN 10 +#define MAX_TRIES 100 +#define MIN_Xs 6 + +#define SUFFIX ".suff" +#define SLEN (sizeof SUFFIX - 1) + +sudo_dso_public int main(int argc, char *argv[]); + +/* + * verify that a path generated by mkdtemp() or mkstemp() looks like a + * reasonable expansion of the template and matches the fd. Returns true + * if all the X's were replaced with non-X's + */ +static int +check(int fd, char const *kind, char const *path, char const *prefix, + size_t plen, char const *suffix, size_t slen, int tlen) +{ + struct stat sb, fsb; + char const *p; + + if (tlen < MIN_Xs) { + if (fd != -1) + sudo_fatalx("%s(%s) succeed with too few Xs", kind, path); + if (errno != EINVAL) + sudo_fatal("%s(%s) failed with wrong errno: %d", kind, path, errno); + return 1; + } + if (fd == -1) + sudo_fatal("%s(%s)", kind, path); + if (stat(path, &sb)) + sudo_fatal("%s: stat(%s)", kind, path); + if (fd >= 0) { + if (fstat(fd, &fsb)) + sudo_fatal("%s: fstat(%d==%s)", kind, fd, path); + if (sb.st_dev != fsb.st_dev || sb.st_ino != fsb.st_ino) + sudo_fatalx("%s: stat mismatch", kind); + } + if (memcmp(path, prefix, plen) != 0) + sudo_fatalx("%s: prefix changed! %s vs %s", kind, prefix, path); + if (memcmp(path + plen + tlen, suffix, slen + 1) != 0) + sudo_fatalx("%s: suffix changed! %s vs %s", kind, suffix, path); + for (p = path + plen; p < path + plen + tlen; p++) + if (*p == '\0') + sudo_fatalx("%s: unexpected truncation", kind); + else if (*p == 'X') + return 0; + return 1; +} + +static void +try_mkdtemp(char *p, char const *prefix, int len) +{ + size_t plen = strlen(prefix); + int fd, tries, ok; + + for (tries = 0; tries < MAX_TRIES; tries++) { + memcpy(p, prefix, plen); + memset(p + plen, 'X', len); + p[plen + len] = '\0'; + fd = mkdtemp(p) ? -2 : -1; + ok = check(fd, "mkdtemp", p, prefix, plen, "", 0, len); + rmdir(p); + if (ok) + return; + } + sudo_fatalx("mkdtemp: exceeded MAX_TRIES"); +} + +static void +try_mkstemps(char *p, char const *prefix, int len, char const *suffix) +{ + size_t plen = strlen(prefix); + size_t slen = strlen(suffix); + int tries, fd, ok; + + for (tries = 0; tries < MAX_TRIES; tries++) { + memcpy(p, prefix, plen); + memset(p + plen, 'X', len); + memcpy(p + plen + len, suffix, slen + 1); + fd = mkstemps(p, slen); + ok = check(fd, "mkstemp", p, prefix, plen, suffix, slen, len); + close(fd); + unlink(p); + if (ok) + return; + } + sudo_fatalx("mkstemps: exceeded MAX_TRIES"); +} + +int +main(int argc, char *argv[]) +{ + char cwd[PATH_MAX + 1]; + char *p; + size_t clen; + long pg; + int ch, i; + + initprogname(argc > 0 ? argv[0] : "mktemp_test"); + + while ((ch = getopt(argc, argv, "v")) != -1) { + switch (ch) { + case 'v': + /* ignore */ + break; + default: + fprintf(stderr, "usage: %s [-v]\n", getprogname()); + return EXIT_FAILURE; + } + } + argc -= optind; + argv += optind; + + pg = sysconf(_SC_PAGESIZE); + if (getcwd(cwd, sizeof cwd - 1) == NULL) + sudo_fatal("getcwd"); + clen = strlen(cwd); + cwd[clen++] = '/'; + cwd[clen] = '\0'; +#ifdef MAP_ANON + p = mmap(NULL, pg * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0); +#else + i = open("/dev/zero", O_RDWR); + if (i == -1) + sudo_fatal("/dev/zero"); + p = mmap(NULL, pg * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE, i, 0); +#endif + if (p == MAP_FAILED) + sudo_fatal("mmap"); + if (mprotect(p, pg, PROT_NONE) || mprotect(p + pg * 2, pg, PROT_NONE)) + sudo_fatal("mprotect"); + p += pg; + + i = MAX_TEMPLATE_LEN + 1; + while (i-- > 0) { + /* try first at the start of a page, no prefix */ + try_mkdtemp(p, "", i); + /* now at the end of the page, no prefix */ + try_mkdtemp(p + pg - i - 1, "", i); + /* start of the page, prefixed with the cwd */ + try_mkdtemp(p, cwd, i); + /* how about at the end of the page, prefixed with cwd? */ + try_mkdtemp(p + pg - clen - i - 1, cwd, i); + + /* again, with mkstemps() and an empty suffix */ + /* try first at the start of a page, no prefix */ + try_mkstemps(p, "", i, ""); + /* now at the end of the page, no prefix */ + try_mkstemps(p + pg - i - 1, "", i, ""); + /* start of the page, prefixed with the cwd */ + try_mkstemps(p, cwd, i, ""); + /* how about at the end of the page, prefixed with cwd? */ + try_mkstemps(p + pg - clen - i - 1, cwd, i, ""); + + /* mkstemps() and a non-empty suffix */ + /* try first at the start of a page, no prefix */ + try_mkstemps(p, "", i, SUFFIX); + /* now at the end of the page, no prefix */ + try_mkstemps(p + pg - i - SLEN - 1, "", i, SUFFIX); + /* start of the page, prefixed with the cwd */ + try_mkstemps(p, cwd, i, SUFFIX); + /* how about at the end of the page, prefixed with cwd? */ + try_mkstemps(p + pg - clen - i - SLEN - 1, cwd, i, SUFFIX); + } + + return 0; +} |