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Bug #81577 Segfault when signal handler raising a fatal error interrupts sleep+negation
Submitted: 2021-10-31 08:42 UTC Modified: 2024-07-28 04:22 UTC
Votes:2
Avg. Score:4.0 ± 1.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: abecker at mailbox dot org Assigned: cmb (profile)
Status: No Feedback Package: PCNTL related
PHP Version: 8.0.12 OS: Linux
Private report: No CVE-ID: None
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 [2021-10-31 08:42 UTC] abecker at mailbox dot org 
Description:
------------
Run the test script on the command line and press Ctrl+C. The program will crash.

A crash will occur if sleep is interrupted by the faulty signal handler and
a negation of any variable with any value follows immediately. Negation of
a constant will not result in a crash.

Test script:
---------------
pcntl_async_signals(true);
pcntl_signal(SIGINT, function() { 0/0; });
sleep(10);
! $anyVariableWithAnyValue;

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 [2021-11-02 09:40 UTC] cmb@php.net
-Package: Reproducible crash +Package: PCNTL related
 [2021-11-04 11:13 UTC] nikic@php.net
-Status: Open +Status: Verified
 [2021-11-04 11:13 UTC] nikic@php.net 
Confirmed under valgrind:

^C==185861== Conditional jump or move depends on uninitialised value(s)
==185861==    at 0xA256BE: zval_ptr_dtor_nogc (zend_variables.h:34)
==185861==    by 0xA3B359: ZEND_HANDLE_EXCEPTION_SPEC_HANDLER (zend_vm_execute.h:2978)
==185861==    by 0xAA6D96: execute_ex (zend_vm_execute.h:54284)
==185861==    by 0xAAC367: zend_execute (zend_vm_execute.h:58523)
==185861==    by 0x9FCCCE: zend_execute_scripts (zend.c:1680)
==185861==    by 0x95E7C2: php_execute_script (main.c:2539)
==185861==    by 0xAED57D: do_cli (php_cli.c:949)
==185861==    by 0xAEE5CA: main (php_cli.c:1337)
==185861==
 [2021-11-04 14:08 UTC] nikic@php.net 
The following pull request has been associated:

Patch Name: Fix bug #81577: Execute interrupt handler on original opline
On GitHub:  https://github.com/php/php-src/pull/7624
Patch:      https://github.com/php/php-src/pull/7624.patch
 [2021-11-11 08:08 UTC] nikic@php.net 
Related To: Bug #81610
 [2021-11-11 18:28 UTC] dmitry@php.net 
The bug is partially fixed in PHP-8.0 and above by the following commits:

https://github.com/php/php-src/commit/fa0b84a06b03a1c2a2bcadd647232a8a4a90aa05
https://github.com/php/php-src/commit/5380b415a243e538240fbbb92bf020a3719ab927
 [2021-11-12 03:05 UTC] tstarling@php.net 
I confirmed that the commits by Dmitry fix the test case I reported at bug #81610. I did still observe an "AddressSanitizer: heap-use-after-free" error during random testing, from debug_backtrace_get_args() due to exception object creation. I haven't isolated it and I don't plan on working on it right now, but I can provide the backtrace if you're interested.
 [2024-07-19 21:48 UTC] cmb@php.net
-Status: Verified +Status: Feedback -Assigned To: +Assigned To: cmb
 [2024-07-19 21:48 UTC] cmb@php.net 
Is that still an issue with any of the actively supported PHP
versions[1]?

[1] <https://www.php.net/supported-versions>
 [2024-07-28 04:22 UTC] php-bugs at lists dot php dot net 
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 [2024-08-04 13:25 UTC] aabz41771 at gmail dot com 
The following pull request has been associated:

Patch Name: Drop url.pecl.windows.releases entity declaration
On GitHub:  https://github.com/php/doc-base/pull/143
Patch:      https://github.com/php/doc-base/pull/143.patch
 
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