Fix GH-11950: [mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set #11951

SakiTakamachi · 2023-08-12T16:15:39Z

This is a PR to solve the issue #11950

Girgias · 2023-08-12T17:39:35Z

PHP 8.0 is out of support, please rebase onto 8.1

kamil-tekiela · 2023-08-12T17:45:18Z

0d922aa

SakiTakamachi · 2023-08-12T21:55:14Z

@kamil-tekiela

Thank you.

I know that PR.
However, even with code from the latest PHP-8.1 branch, this issue still seems to occur.

SakiTakamachi · 2023-08-12T21:59:38Z

@Girgias

PHP 8.0 is out of support, please rebase onto 8.1

Thanks, fixed it.

kamil-tekiela · 2023-08-12T22:29:15Z

@kamil-tekiela

Thank you.

I know that PR. However, even with code from the latest PHP-8.1 branch, this issue still seems to occur.

Are you sure? When I execute your test script on both master and 8.1, I get this:

Uncaught mysqli_sql_exception: MySQL server has gone away

SakiTakamachi · 2023-08-13T01:45:37Z

Hmm, this happens no matter how many times I try.

Fatal error: Uncaught mysqli_sql_exception: Malformed packet in /var/www/html/test/test.php:11

I'll check again to see if I've misconfigured something.

SakiTakamachi · 2023-08-13T04:56:58Z

Although the result has not changed yet, I will describe my operating environment.

I are still investigating.

https://gist.github.com/SakiTakamachi/866c15ef2e8e333ae526a286b1428fbc

SakiTakamachi · 2023-08-13T06:43:27Z

@kamil-tekiela

First of all, it looks like bytes_sent = 0; is not running in my environment....

(edit) I made the breakpoints a bit more descriptive and re-ran.

<?php

$mysqli = new mysqli("mysql", "root", "", "test"); // my env 
var_dump($mysqli->select_db("test2"));

// master branch

(gdb) break mysqlnd_read_header
Breakpoint 1 at 0x50cee7: file /var/www/html/php-src/ext/mysqlnd/mysqlnd_wireprotocol.c, line 244.
(gdb) break mysqlnd_protocol_frame_codec.c:202
Breakpoint 2 at 0x52397f: file /var/www/html/php-src/ext/mysqlnd/mysqlnd_protocol_frame_codec.c, line 202.
(gdb) break mysqlnd_protocol_frame_codec.c:203
Breakpoint 3 at 0x52398d: file /var/www/html/php-src/ext/mysqlnd/mysqlnd_protocol_frame_codec.c, line 203.
(gdb) break mysqlnd_protocol_frame_codec.c:205
Breakpoint 4 at 0x523a2d: file /var/www/html/php-src/ext/mysqlnd/mysqlnd_protocol_frame_codec.c, line 205.
(gdb) break mysqli_api.c:1620
Breakpoint 5 at 0x36c180: file /var/www/html/php-src/ext/mysqli/mysqli_api.c, line 1621.
(gdb) run ../test/test.php
Starting program: /var/www/html/php-src/sapi/cli/php ../test/test.php

Breakpoint 1, mysqlnd_read_header (pfc=0x555555989897 <php_tcp_sockop_connect+1546>, vio=0x7fffffffb700, header=0x7ffff7a05050, conn_stats=0x555555ce2340, error_info=0x33b00000000) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_wireprotocol.c:244
244	{
(gdb) c
Continuing.

Breakpoint 2, mysqlnd_mysqlnd_pfc_send_pub (pfc=0x7ffff7a83140, vio=0x7ffff7a6c300, buffer=0x7fffffff9d40 "j", count=106, conn_stats=0x7ffff7a040c0, error_info=0x7ffff7a7a120) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_protocol_frame_codec.c:202
202		if (bytes_sent <= 0) {
(gdb) c
Continuing.

Breakpoint 1, mysqlnd_read_header (pfc=0x8, vio=0x7ffff7a01230, header=0x0, conn_stats=0x15, error_info=0x1) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_wireprotocol.c:244
244	{
(gdb) c
Continuing.

Breakpoint 2, mysqlnd_mysqlnd_pfc_send_pub (pfc=0x7ffff7a83140, vio=0x7ffff7a6c300, buffer=0x7ffff7a7f000 "", count=0, conn_stats=0x7ffff7a040c0, error_info=0x7ffff7a7a120) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_protocol_frame_codec.c:202
202		if (bytes_sent <= 0) {
(gdb) c
Continuing.

Breakpoint 1, mysqlnd_read_header (pfc=0x7ffff7a77500, vio=0x7ffff7a7f000, header=0x4, conn_stats=0x0, error_info=0x55555597638b <_php_stream_write+197>) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_wireprotocol.c:244
244	{
(gdb) c
Continuing.

Breakpoint 5, zif_mysqli_select_db (execute_data=0x555555a3b31c <zend_verify_internal_arg_types+220>, return_value=0x7fffffffc130) at /var/www/html/php-src/ext/mysqli/mysqli_api.c:1621
1621	{

/* -------------- mysql restart -------------- */

(gdb) c
Continuing.

Breakpoint 2, mysqlnd_mysqlnd_pfc_send_pub (pfc=0x7ffff7a83140, vio=0x7ffff7a6c300, buffer=0x7ffff7a7f000 "\006", count=6, conn_stats=0x7ffff7a040c0, error_info=0x7ffff7a7a120) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_protocol_frame_codec.c:202
202		if (bytes_sent <= 0) {
(gdb) p bytes_sent
$1 = 10
(gdb) c
Continuing.

Breakpoint 1, mysqlnd_read_header (pfc=0x0, vio=0x0, header=0x0, conn_stats=0x0, error_info=0x0) at /var/www/html/php-src/ext/mysqlnd/mysqlnd_wireprotocol.c:244
244	{
(gdb) c
Continuing.

Warning: mysqli::select_db(): Error while reading INIT_DB's response packet. PID=109 in /var/www/html/test/test.php on line 4

Fatal error: Uncaught mysqli_sql_exception: Malformed packet in /var/www/html/test/test.php:4
Stack trace:
#0 /var/www/html/test/test.php(4): mysqli->select_db('test2')
#1 {main}
  thrown in /var/www/html/test/test.php on line 4
[Inferior 1 (process 109) exited with code 0377]

SakiTakamachi · 2023-08-18T02:55:43Z

@kamil-tekiela
I investigated.

0d922aa
This fix works for errors on pfc->data->m.send() in mysqlnd_wireprotocol.c.

This issue is for pfc->data->m.receive().

I think the problem is that mysqlnd_read_packet_header_and_body correctly sets the error, but then the error is overwritten.

kamil-tekiela · 2023-08-18T15:41:59Z

I still cannot reproduce this issue in my environment. I don't know what I am doing wrong. I would appreciate some step by step instructions.

If you really get the error "Error while reading INIT_DB's response packet." then it means something is seriously broken. This warning is defensive programming and we should never get there. So I don't think it's the case of overwritten error, but something more serious.

I would appreciate if you could share as much details as possible. I hope we can resolve it together.

SakiTakamachi · 2023-08-19T04:23:27Z

@kamil-tekiela k

I see.

I'll keep investigating to see if I can find any clues.

~~I'm going to close this PR and write a continuation to the issue, but is that okay?~~

SakiTakamachi · 2023-08-19T05:55:53Z

The error Error while reading INIT_DB's response packet. was set here.

php-src/ext/mysqlnd/mysqlnd_wireprotocol.c

Line 2581 in 7f1c3bf

    
           php_error_docref(NULL, E_WARNING, "Error while reading %s's response packet. PID=%d", mysqlnd_command_to_text[command], getpid());

This if runs with condition !silent && error_info->error_no == CR_MALFORMED_PACKET.

This message is easily printed because send_command_handle_OK() was called in the previous switch and the error is overwritten there with CR_MALFORMED_PACKET.

php-src/ext/mysqlnd/mysqlnd_wireprotocol.c

Line 2570 in 7f1c3bf

    
           ret = payload_decoder_factory->m.send_command_handle_OK(payload_decoder_factory, error_info, upsert_status, ignore_upsert_status, last_message);

php-src/ext/mysqlnd/mysqlnd_wireprotocol.c

Line 2471 in 7f1c3bf

    
           SET_CLIENT_ERROR(error_info, CR_MALFORMED_PACKET, UNKNOWN_SQLSTATE, "Malformed packet");

SakiTakamachi · 2023-08-19T06:13:41Z

To reproduce this error, restart the docker mysql container itself.
Or stop the container.

I'm trying to see if it can be reproduced with php and mysql on the host OS without using docker.

SakiTakamachi · 2023-08-19T08:12:01Z

(edit) Oops, I forgot to build the local php. I'll rerun.

I have successfully reproduced it on the host OS.

repro code

// test.php

<?php

$driver = new mysqli_driver();
$driver->report_mode = MYSQLI_REPORT_ERROR|MYSQLI_REPORT_STRICT;

$mysqli = new mysqli("localhost", "root", "", "test"); // my env 

fgets(STDIN);
// Restarted mysql, then press enter

var_dump($mysqli->select_db("test2"));

my env

MacBook Pro 16-inch, 2019 (intel)

// php -v

PHP 8.2.9 (cli) (built: Aug 16 2023 21:20:30) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.9, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.9, Copyright (c), by Zend Technologies

// mysql> select version();

+-----------+
| version() |
+-----------+
| 8.1.0     |
+-----------+

steps

Open two terminals, one for php operations and one for restarting mysql.
Run php test.php on the terminal for php. Without pressing anything, go to step3.
Run sudo mysql.server restart on the terminal for mysql. Wait for mysql to finish restarting.
Press the enter key on the terminal for php.

kamil-tekiela · 2023-08-19T08:24:33Z

PHP 8.2.9 isn't the latest release in PHP 8.2 branch. My fix is included in 8.2.10

SakiTakamachi · 2023-08-19T09:25:26Z

I forgot to build a fresh PHP on my host OS.

It could be reproduced when connecting from PHP in the Docker container to mysql on the host.
I tried building PHP8.3-dev on the host, but it certainly won't be reproducible in this case.

I'll look into it some more.

SakiTakamachi · 2023-08-19T11:34:09Z

If using php of host OS, this ret will be FAIL.

php-src/ext/mysqlnd/mysqlnd_commands.c

Line 92 in 7f1c3bf

    
           ret = send_command(conn->payload_decoder_factory, COM_INIT_DB, (const zend_uchar*) db.s, db.l, FALSE,

And in gdb I get the following message: Thread 2 received signal SIGPIPE, Broken pipe

On the other hand, if using php in a docker container, the above ret will be PASS.
This causes the following line to be executed, which in turn FAIL and raises an error.

php-src/ext/mysqlnd/mysqlnd_commands.c

Line 100 in 7f1c3bf

    
           ret = send_command_handle_response(conn->payload_decoder_factory, PROT_OK_PACKET, FALSE, COM_INIT_DB, TRUE,

kamil-tekiela · 2023-08-19T14:18:48Z

If using php of host OS, this ret will be FAIL.

php-src/ext/mysqlnd/mysqlnd_commands.c

Line 92 in 7f1c3bf

ret = send_command(conn->payload_decoder_factory, COM_INIT_DB, (const zend_uchar*) db.s, db.l, FALSE,

And in gdb I get the following message: Thread 2 received signal SIGPIPE, Broken pipe
On the other hand, if using php in a docker container, the above ret will be PASS. This causes the following line to be executed, which in turn FAIL and raises an error.

php-src/ext/mysqlnd/mysqlnd_commands.c

Line 100 in 7f1c3bf

ret = send_command_handle_response(conn->payload_decoder_factory, PROT_OK_PACKET, FALSE, COM_INIT_DB, TRUE,

That's exactly what my commit (0d922aa) fixed. I guess something must be wrong with your docker setup if compiling PHP 8.1 branch still produces this error. The function returned PASS because the value of sent in php_mysqlnd_cmd_write overflowed. I fixed it, so now the function returns FAIL correctly.

Please double check your docker setup. Check what the value of sent is and what the value of bytes_sent is. Let me know what you find out. If there's still something missing, we need to find a fix.

Good job on debugging though. This is a really good skill.

SakiTakamachi · 2023-08-19T14:34:13Z

@kamil-tekiela

The docker write buffer results were exactly the same as when I had a normal connection.

// docker
php_sockop_write (stream=0x5555559079a8 <zend_string_release_ex+225>, buf=0x7fffffffbb80 "\240\273\377\377\377\177", count=140737348335360) at /var/www/html/php-src/main/streams/xp_socket.c:58
58	{
(gdb) 
59		php_netstream_data_t *sock = (php_netstream_data_t*)stream->abstract;
(gdb) 
63		if (!sock || sock->socket == -1) {
(gdb) 
67		if (sock->timeout.tv_sec == -1)
(gdb) 
70			ptimeout = &sock->timeout;
(gdb) 
73		didwrite = send(sock->socket, buf, XP_SOCK_BUF_SIZE(count), (sock->is_blocked && ptimeout) ? MSG_DONTWAIT : 0);
(gdb) 
__libc_send (fd=4, buf=0x7ffff7a7f000, len=10, flags=64) at ../sysdeps/unix/sysv/linux/send.c:24
24	../sysdeps/unix/sysv/linux/send.c: No such file or directory.
(gdb) 
28	in ../sysdeps/unix/sysv/linux/send.c
(gdb) 
php_sockop_write (stream=0x7ffff7a77600, buf=0x7ffff7a7f000 "\006", count=10) at /var/www/html/php-src/main/streams/xp_socket.c:75
75		if (didwrite <= 0) {
(gdb) p sock->socket
$8 = 4
(gdb) p count
$9 = 10
(gdb) p sock->is_blocked && ptimeout
$10 = 1
(gdb) p buf
$11 = 0x7ffff7a7f000 "\006"
(gdb) p didwrite
$12 = 10

// Mac
php_sockop_write (stream=0x102077900, buf=0x10207f000 "\006", count=10) at /Users/saki/develop/php-src/main/streams/xp_socket.c:59
59		php_netstream_data_t *sock = (php_netstream_data_t*)stream->abstract;
(gdb) 
63		if (!sock || sock->socket == -1) {
(gdb) 
67		if (sock->timeout.tv_sec == -1)
(gdb) 
70			ptimeout = &sock->timeout;
(gdb) 
67		if (sock->timeout.tv_sec == -1)
(gdb) 
73		didwrite = send(sock->socket, buf, XP_SOCK_BUF_SIZE(count), (sock->is_blocked && ptimeout) ? MSG_DONTWAIT : 0);
(gdb) p sock->socket
$1 = 4
(gdb) p count
$2 = 10
(gdb) p buf
$3 = 0x10207f000 "\006"
(gdb) p sock->is_blocked && ptimeout
$4 = 1
(gdb) s

Thread 2 received signal SIGPIPE, Broken pipe.
75		if (didwrite <= 0) {
(gdb) p didwrite
$5 = -1

After digging this far, I finally got an idea, but isn't this a problem with the specifications of socket communication?
read() can detect the disconnection immediately, but send() may not know that the connection has been disconnected until it is sent twice.

SakiTakamachi · 2023-08-19T15:59:24Z

I think this prediction is probably correct.
When I performed a similar test with a combination of connecting to Docker's mysql from the host OS, the Malformed packet error occurred.

Perhaps the result was different because it was a combination of php and mysql of the host OS. If the services are in the same environment, the disconnection may be noticed the first time send() is executed.

SakiTakamachi · 2023-09-06T22:57:55Z

@kamil-tekiela

Is there any more information you need?

kamil-tekiela · 2023-09-07T20:27:20Z

I am busy with some other stuff at the moment. I will review it soon. I need to spend some more time to check what you are saying.

SakiTakamachi · 2023-09-07T20:47:19Z

Okay, sorry for rushing you.

adsr · 2023-10-12T06:07:08Z

IMO the error emitted here:

php-src/ext/mysqlnd/mysqlnd_wireprotocol.c

Line 2471 in f907a00

    
           SET_CLIENT_ERROR(error_info, CR_MALFORMED_PACKET, UNKNOWN_SQLSTATE, "Malformed packet");

is potentially misleading.

There's a difference between trying to read the socket and getting EOF and reading in an actually malformed packet. In both cases PACKET_READ returns FAIL. If there's metadata available at this line to determine if we hit a socket EOF (i.e., the underlying recv(2) returned 0), then IMO we should emit CR_SERVER_GONE_ERROR instead, which would fix your issue. There's already handling below that handles well-formed error packets. Ideally we would also distinguish packets that are well-formed but violate protocol (such as seeing a resultset packet in response to a COM_INIT_DB).

Looking at mysqlnd it looks there are lots of similar assumptions floating around. FAIL by itself is not enough to determine what error to emit.

SakiTakamachi · 2023-10-12T06:17:04Z

@adsr

Yeah, PACKET_READ(payload_decoder_factory->conn, &ok_response) must be FAIL for the line you showed to be executed.

php-src/ext/mysqlnd/mysqlnd_wireprotocol.c

Line 2469 in f907a00

if (FAIL == (ret = PACKET_READ(payload_decoder_factory->conn, &ok_response))) {

And if this results in FAIL, CR_SERVER_GONE_ERROR may already be set on the line shown below.

php-src/ext/mysqlnd/mysqlnd_wireprotocol.c

Line 297 in f907a00

    
           SET_CLIENT_ERROR(error_info, CR_SERVER_GONE_ERROR, UNKNOWN_SQLSTATE, mysqlnd_server_gone);

Therefore, I changed it to check if an error has already been set when PACKET_READ(payload_decoder_factory->conn, &ok_response) == FAIL.

adsr · 2023-10-12T19:47:46Z

CR_SERVER_GONE_ERROR may already be set

Understood. I would bet this could happen in other places too. Rather than fixing your very specific case, could it be solved more generally in SET_CLIENT_ERROR itself? I.e., only set error_no if it's 0, and ensure mysqlnd_error_info_init is invoked at any userland entrypoint? I don't know if that's safe but at least conceptually it makes sense.

My comments re: CR_MALFORMED_PACKET still apply, but I suppose that's a separate issue.

SakiTakamachi · 2023-10-12T23:56:59Z

I see, that makes sense.

As far as I could see, this was the only place where this could happen, so I was proposing a fix like this.

However, in a sense, my modification is like a monkey patch, and it may be wise to fundamentally change the mechanism to solve the problem.

… is already set

nielsdos

I was able to reproduce the issue, and I see how it is caused by an error that was overwritten. This does fix the issue for me.
LGTM.

kamil-tekiela · 2024-02-10T12:59:21Z

@nielsdos Ok, can you please merge the PR then? As long as it fixes the issue and doesn't cause any others then let's merge it.

SakiTakamachi · 2024-02-10T13:17:55Z

Thanks for checking and merging!

SakiTakamachi changed the title ~~Fix GH-11950: Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set~~ Fix GH-11950: [mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set Aug 12, 2023

Girgias requested a review from kamil-tekiela August 12, 2023 17:39

Girgias added Extension: mysqli Extension: mysqlnd labels Aug 12, 2023

SakiTakamachi force-pushed the fix/gh-11950 branch from c9abe2c to a4b83c4 Compare August 12, 2023 21:58

SakiTakamachi changed the base branch from PHP-8.0 to PHP-8.1 August 12, 2023 21:58

SakiTakamachi mentioned this pull request Aug 19, 2023

mysqlnd: error message is inappropriate in some cases #11950

Closed

SakiTakamachi force-pushed the fix/gh-11950 branch from cfc659a to 68cdd3f Compare February 10, 2024 01:25

SakiTakamachi changed the base branch from PHP-8.1 to PHP-8.2 February 10, 2024 01:26

Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR…

1e35957

… is already set

SakiTakamachi force-pushed the fix/gh-11950 branch from 68cdd3f to 1e35957 Compare February 10, 2024 01:26

SakiTakamachi requested a review from nielsdos February 10, 2024 01:27

github-actions bot removed the Extension: mysqli label Feb 10, 2024

nielsdos approved these changes Feb 10, 2024

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nielsdos linked an issue Feb 10, 2024 that may be closed by this pull request

mysqlnd: error message is inappropriate in some cases #11950

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nielsdos closed this in 199e48b Feb 10, 2024

SakiTakamachi deleted the fix/gh-11950 branch March 15, 2024 14:15

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Fix GH-11950: [mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set #11951

Fix GH-11950: [mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set #11951

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Fix GH-11950: [mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set #11951

Fix GH-11950: [mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set #11951

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repro code

my env

steps

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