mirror of
https://github.com/wolfcw/libfaketime.git
synced 2026-05-17 00:26:16 +03:00
ensure faketime can't be initialized more than once
One callsite of ftpl_init wasn't protected by the "if (!initialized)" condition, specifically: static void ftpl_init (void) __attribute__ ((constructor)); If another "constructor" was called before this one, and that other constructor used time or filesystem functions, ftlp_init would be initialized by that other constructor, and then reinitialized by the ftpl_init constructor. At that point, confusion ensues.
This commit is contained in:
Valentin Gatien-Baron
@@ -969,10 +969,7 @@ static inline void fake_stat64buf (struct stat64 *buf) {
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/* macOS dyld interposing uses the function's real name instead of real_name */
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#ifdef MACOS_DYLD_INTERPOSE
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#define STAT_HANDLER_COMMON(name, buf, fake_statbuf, ...) \
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if (!initialized) \
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{ \
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ftpl_init(); \
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} \
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ftpl_init(); \
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if (!CHECK_MISSING_REAL(name)) return -1; \
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\
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int result; \
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@@ -993,10 +990,7 @@ static inline void fake_stat64buf (struct stat64 *buf) {
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return result;
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#else
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#define STAT_HANDLER_COMMON(name, buf, fake_statbuf, ...) \
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if (!initialized) \
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{ \
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ftpl_init(); \
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} \
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ftpl_init(); \
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if (!CHECK_MISSING_REAL(name)) return -1; \
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\
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int result; \
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@@ -1124,10 +1118,7 @@ int macos_utime(const char *filename, const struct utimbuf *times)
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int utime(const char *filename, const struct utimbuf *times)
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#endif
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (!CHECK_MISSING_REAL(utime)) return -1;
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int result;
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@@ -1160,10 +1151,7 @@ int macos_utimes(const char *filename, const struct timeval times[2])
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int utimes(const char *filename, const struct timeval times[2])
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#endif
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (!CHECK_MISSING_REAL(utimes)) return -1;
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int result;
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@@ -1238,10 +1226,7 @@ int macos_utimensat(int dirfd, const char *filename, const struct timespec times
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int utimensat(int dirfd, const char *filename, const struct timespec times[2], int flags)
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#endif
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (!CHECK_MISSING_REAL(utimensat)) return -1;
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int result;
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@@ -1261,10 +1246,7 @@ int macos_futimens(int fd, const struct timespec times[2])
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int futimens(int fd, const struct timespec times[2])
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#endif
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (!CHECK_MISSING_REAL(futimens)) return -1;
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int result;
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@@ -1299,10 +1281,7 @@ int nanosleep(const struct timespec *req, struct timespec *rem)
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int result;
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struct timespec real_req;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_nanosleep == NULL)
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{
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return -1;
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@@ -1354,10 +1333,7 @@ int clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *req, s
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int result;
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struct timespec real_req;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_clock_nanosleep == NULL)
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{
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return -1;
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@@ -1435,10 +1411,7 @@ int usleep(useconds_t usec)
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{
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int result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (user_rate_set && !dont_fake)
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{
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struct timespec real_req;
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@@ -1487,10 +1460,7 @@ unsigned int macos_sleep(unsigned int seconds)
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unsigned int sleep(unsigned int seconds)
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#endif
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (user_rate_set && !dont_fake)
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{
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if (real_nanosleep == NULL)
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@@ -1559,10 +1529,7 @@ unsigned int alarm(unsigned int seconds)
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unsigned int ret;
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unsigned int seconds_real = (user_rate_set && !dont_fake)?((1.0 / user_rate) * seconds):seconds;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_alarm == NULL)
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{
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return -1;
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@@ -1585,10 +1552,7 @@ int ppoll(struct pollfd *fds, nfds_t nfds,
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struct timespec real_timeout, *real_timeout_pt;
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int ret;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_ppoll == NULL)
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{
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return -1;
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@@ -1623,10 +1587,7 @@ int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)
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{
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int ret, real_timeout;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_epoll_wait == NULL)
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{
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return -1;
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@@ -1650,10 +1611,7 @@ int epoll_pwait(int epfd, struct epoll_event *events, int maxevents, int timeout
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{
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int ret, real_timeout;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_epoll_pwait == NULL)
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{
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return -1;
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@@ -1682,10 +1640,7 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
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{
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int ret, timeout_real = (user_rate_set && !dont_fake && (timeout > 0))?(timeout / user_rate):timeout;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_poll == NULL)
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{
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return -1;
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@@ -1717,10 +1672,7 @@ int select(int nfds, fd_set *readfds,
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int ret;
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struct timeval timeout_real;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_select == NULL)
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{
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@@ -1784,10 +1736,7 @@ int pselect(int nfds, fd_set *readfds,
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int ret;
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struct timespec timeout_real;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_pselect == NULL)
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{
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@@ -1940,10 +1889,7 @@ timer_settime_common(timer_t_or_int timerid, int flags,
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struct itimerspec new_real;
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struct itimerspec *new_real_pt = &new_real;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (new_value == NULL)
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{
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new_real_pt = NULL;
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@@ -2052,10 +1998,7 @@ int timer_settime_22(int timerid, int flags,
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const struct itimerspec *new_value,
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struct itimerspec *old_value)
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timer_settime_22 == NULL)
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{
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return -1;
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@@ -2076,10 +2019,7 @@ int timer_settime_233(timer_t timerid, int flags,
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const struct itimerspec *new_value,
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struct itimerspec *old_value)
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timer_settime_233 == NULL)
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{
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return -1;
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@@ -2101,10 +2041,7 @@ int timer_gettime_common(timer_t_or_int timerid, struct itimerspec *curr_value,
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{
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int result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timer_gettime_233 == NULL)
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{
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return -1;
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@@ -2149,10 +2086,7 @@ int timer_gettime_common(timer_t_or_int timerid, struct itimerspec *curr_value,
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*/
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int timer_gettime_22(timer_t timerid, struct itimerspec *curr_value)
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timer_gettime_22 == NULL)
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{
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return -1;
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@@ -2171,10 +2105,7 @@ int timer_gettime_22(timer_t timerid, struct itimerspec *curr_value)
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*/
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int timer_gettime_233(timer_t timerid, struct itimerspec *curr_value)
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timer_gettime_233 == NULL)
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{
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return -1;
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@@ -2201,10 +2132,7 @@ int timerfd_settime(int fd, int flags,
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const struct itimerspec *new_value,
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struct itimerspec *old_value)
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timerfd_settime == NULL)
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{
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return -1;
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@@ -2223,10 +2151,7 @@ int timerfd_settime(int fd, int flags,
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*/
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int timerfd_gettime(int fd, struct itimerspec *curr_value)
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{
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (real_timerfd_gettime == NULL)
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{
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return -1;
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@@ -2263,10 +2188,7 @@ time_t time(time_t *time_tptr)
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struct timespec tp;
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time_t result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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#ifdef MACOS_DYLD_INTERPOSE
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DONT_FAKE_TIME(result = (*clock_gettime)(CLOCK_REALTIME, &tp));
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#else
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@@ -2293,10 +2215,7 @@ int ftime(struct timeb *tb)
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struct timespec tp;
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int result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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/* sanity check */
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if (tb == NULL)
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return 0; /* ftime() always returns 0, see manpage */
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@@ -2336,10 +2255,7 @@ int gettimeofday(struct timeval *tv, void *tz)
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{
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int result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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/* sanity check */
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if (tv == NULL)
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{
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@@ -2452,10 +2368,7 @@ int timespec_get(struct timespec *ts, int base)
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{
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int result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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/* sanity check */
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if (ts == NULL)
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{
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@@ -2656,7 +2569,7 @@ parse_modifiers:
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* =======================================================================
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*/
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static void ftpl_init(void)
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static void ftpl_really_init(void)
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{
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char *tmp_env;
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bool dont_fake_final;
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@@ -3060,6 +2973,12 @@ static void ftpl_init(void)
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dont_fake = dont_fake_final;
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}
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inline static void ftpl_init(void) {
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if (!initialized)
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{
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ftpl_really_init();
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}
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}
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/*
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* =======================================================================
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@@ -3670,10 +3589,7 @@ int pthread_cond_init_232(pthread_cond_t *restrict cond, const pthread_condattr_
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clockid_t clock_id;
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int result;
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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if (!CHECK_MISSING_REAL(pthread_cond_init_232)) return -1;
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result = real_pthread_cond_init_232(cond, attr);
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@@ -4073,10 +3989,7 @@ ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
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if (bypass_randomness(buf, buflen)) {
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return buflen;
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} else {
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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return real_getrandom(buf, buflen, flags);
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}
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}
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@@ -4088,8 +4001,7 @@ int getentropy(void *buffer, size_t length) {
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if (bypass_randomness(buffer, length)) {
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return 0;
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} else {
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if (!initialized)
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ftpl_init();
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ftpl_init();
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#ifdef MACOS_DYLD_INTERPOSE
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return getentropy(buffer, length);
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#else
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@@ -4110,10 +4022,7 @@ pid_t getpid() {
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long int pid = strtol(pidstring, NULL, 0);
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return (pid_t)(pid);
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} else {
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if (!initialized)
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{
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ftpl_init();
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}
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ftpl_init();
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return real_getpid();
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}
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}
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@@ -4150,8 +4059,7 @@ long syscall(long number, ...) {
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for (int i = 0; i < syscall_max_args; i++)
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a[i] = va_arg(ap, variadic_promotion_t);
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va_end(ap);
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if (!initialized)
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ftpl_init();
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ftpl_init();
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return real_syscall(number, a[0], a[1], a[2], a[3], a[4], a[5]);
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}
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#endif
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Block a user