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Fix GH-20601: ftp_connect() timeout argument overflow. #20603

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Fix GH-20601: ftp_connect() timeout argument overflow. #20603

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Fix GH-20601: ftp_connect() timeout argument overflow.
devnexen Nov 27, 2025
37dd21c
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devnexen Nov 29, 2025
b1090b4
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devnexen Nov 29, 2025
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19 changes: 19 additions & 0 deletions ext/ftp/tests/gh20601.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
--TEST--
GH-20601 (ftp_connect timeout overflow)
--EXTENSIONS--
ftp
--SKIPIF--
<?php
if (PHP_INT_SIZE != 8) die("skip: 64-bit only");
if (PHP_OS_FAMILY === 'Windows') die("skip not for windows");
?>
Comment on lines +5 to +9
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@Girgias Girgias Nov 29, 2025

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This an issue that cannot appear on 32 bit nor Windows?

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@devnexen devnexen Nov 29, 2025 •
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yes this test "failed" for both earlier.

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@Girgias Girgias Nov 29, 2025

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Alright

--FILE--
<?php
try {
ftp_connect('127.0.0.1', 1024, PHP_INT_MAX);
} catch (\ValueError $e) {
echo $e->getMessage();
}
?>
--EXPECT--
timeout value overflow
21 changes: 18 additions & 3 deletions main/network.c
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Expand Up @@ -315,16 +315,23 @@ static inline void sub_times(struct timeval a, struct timeval b, struct timeval
}
}

static inline void php_network_set_limit_time(struct timeval *limit_time,
static inline zend_result php_network_set_limit_time(struct timeval *limit_time,
struct timeval *timeout)
{
gettimeofday(limit_time, NULL);
const double timeoutmax = (double) PHP_TIMEOUT_ULL_MAX / 1000000.0;
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@bukka bukka Nov 29, 2025

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I'm just checking the whole logic here and I wonder why PHP_TIMEOUT_ULL_MAX is unsigned int 64? The time_t is signed int 64 (or 32 on 32bit arch) if I'm not mistakend. And in this case this is later converted to int (see php_pollfd_for and mainly php_tvtoto). So what am I missing?

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@devnexen devnexen Nov 29, 2025

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Yes it s unsigned but my sense since it s that way because this constant is never used directly but converted from microseconds value to seconds (so yes unsigned int64 > double > time_t or int).

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@bukka bukka Nov 30, 2025 •
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But how is this covering the lower type overflows? I mean if it gets converted in php_tvtoto, then it will still overflow on conversion to int, right?


if (limit_time->tv_sec > (timeoutmax - timeout->tv_sec)) {
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@bukka bukka Nov 29, 2025

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Shouldn't that be be >=?

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@devnexen devnexen Nov 29, 2025

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yes it should

return FAILURE;
}

limit_time->tv_sec += timeout->tv_sec;
limit_time->tv_usec += timeout->tv_usec;
if (limit_time->tv_usec >= 1000000) {
limit_time->tv_usec -= 1000000;
limit_time->tv_sec++;
}
return SUCCESS;
}
#endif

Expand Down Expand Up @@ -391,7 +398,11 @@ PHPAPI int php_network_connect_socket(php_socket_t sockfd,
if (timeout) {
memcpy(&working_timeout, timeout, sizeof(working_timeout));
#if HAVE_GETTIMEOFDAY
php_network_set_limit_time(&limit_time, &working_timeout);
if (UNEXPECTED(php_network_set_limit_time(&limit_time, &working_timeout) == FAILURE)) {
error = ERANGE;
ret = -1;
goto ok;
}
#endif
Comment on lines 395 to 397
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@Girgias Girgias Nov 29, 2025

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Ditto

}

Expand Down Expand Up @@ -849,7 +860,11 @@ php_socket_t php_network_connect_socket_to_host(const char *host, unsigned short
if (timeout) {
memcpy(&working_timeout, timeout, sizeof(working_timeout));
#if HAVE_GETTIMEOFDAY
php_network_set_limit_time(&limit_time, &working_timeout);
if (UNEXPECTED(php_network_set_limit_time(&limit_time, &working_timeout) == FAILURE)) {
php_network_freeaddresses(psal);
zend_value_error("timeout value overflow");
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@bukka bukka Nov 29, 2025

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I'm not sure about throwing error here even though it already triggers normal errors in some cases.

Why is this even checked here and not in the actual function as it has been case before?

return -1;
}
#endif
}

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