Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 3 commits into from
+28 −0
Closed

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

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
05342f4
Fix GH-20601: ftp_connect() timeout argument overflow.
devnexen Nov 27, 2025
37dd21c
feedback
devnexen Nov 29, 2025
b1090b4
feedback 2
devnexen Nov 29, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions ext/ftp/php_ftp.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -158,11 +158,18 @@ PHP_FUNCTION(ftp_connect)
RETURN_THROWS();
}

const zend_long timeoutmax = (zend_long)((double) PHP_TIMEOUT_ULL_MAX / 1000000.0);

if (timeout_sec <= 0) {
zend_argument_value_error(3, "must be greater than 0");
RETURN_THROWS();
}

if (timeout_sec >= timeoutmax) {
zend_argument_value_error(3, "must be less than " ZEND_LONG_FMT, timeoutmax);
RETURN_THROWS();
}

/* connect */
if (!(ftp = ftp_open(host, (short)port, timeout_sec))) {
RETURN_FALSE;
Expand Down
19 changes: 19 additions & 0 deletions ext/ftp/tests/gh20601.phpt
View file
Open in desktop
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
Copy link
Member

@Girgias Girgias Nov 29, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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

Copy link
Member Author

@devnexen devnexen Nov 29, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

yes this test "failed" for both earlier.

Copy link
Member

@Girgias Girgias Nov 29, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Alright

--FILE--
<?php
try {
ftp_connect('127.0.0.1', 1024, PHP_INT_MAX);
} catch (\ValueError $e) {
echo $e->getMessage();
}
?>
--EXPECTF--
ftp_connect(): Argument #3 ($timeout) must be less than %d
2 changes: 2 additions & 0 deletions main/network.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -319,6 +319,8 @@ static inline void 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;
Copy link
Member

@bukka bukka Nov 29, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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?

Copy link
Member Author

@devnexen devnexen Nov 29, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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).

Copy link
Member

@bukka bukka Nov 30, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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?

ZEND_ASSERT(limit_time->tv_sec < (timeoutmax - timeout->tv_sec));
limit_time->tv_sec += timeout->tv_sec;
limit_time->tv_usec += timeout->tv_usec;
if (limit_time->tv_usec >= 1000000) {
Expand Down
Loading