epoll event backend does not guarantee that child input/output events
are reported before SIGCHILD due to finished worker. While a bunch of
events received by epoll is being processed, child-related structures
may be removed before dispatching of an I/O event for the same child.
The result may be attempt to access to memory region allocated for
another purpose, segfault of the master process, and unavailable web
sites.
Postpone processing of SIGCHILD events till other events in the same
bunch are processed.
Fix Bug #62418 php-fpm master process crashes
Fix Bug #65398 Race condition between SIGCHLD and child stdout/stderr event leads to segfault
Fix Bug #75112 php-fpm crashing, hard to reproduce
Fix Bug #77114 php-fpm master segfaults in fpm_event_epoll_wait/fpm_event_fire
Fix Bug #77185 Use-after-free in FPM master event handling
Also adds an --asan flag to run-tests.php to setup all the necessary
environment variables. Some tests are marked as skipped because they
are incompatible with asan or too slow.
I'm basing this on the DEBUG_ZTS build, which seems to give us the
most mileage.
Some headers were checked multiple times in the main configure.ac file
and in the bundled extensions or SAPIs themselves. Also many of these
checks are then used accross other extensions or SAPIs so a central
configure.ac makes most sense for these checks.
Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment character # which is visible in the output.
- Line length normalized to 80 columns
- Dots for most of the one line sentences
- Macro definitions include similar pattern header comments now
The `<loccale.h>` header file, setlocale, and localeconv are part of the
standard C89 [1] and on current systems can be used unconditionally.
Since PHP 7.4 requires at least C89 or greater, the `HAVE_LOCALE_H`,
`HAVE_SETLOCALE`, and `HAVE_LOCALECONV` symbols defined by Autoconf in
configure.ac [2] can be ommitted and simplifed.
The bundled libmagic (file) has also been patched already in version
5.35 and up in upstream location so when it will be patched also in
php-src the check for locale.h header is still left in the configure.ac
and in windows headers definition file.
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.4
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4
Omit the bundled libmagic files
The `<signal.h>` header file is part of the standard C89 headers [1] and
on current systems can be included unconditionally.
Since file requires at least C89 or greater, the `HAVE_SIGNAL_H` symbol
defined by Autoconf in Zend.m4 [2] can be ommitted and simplifed.
The bundled libmagic (file) also ommits the usage of HAVE_SIGNAL_H since
5.35 however current version in PHP is very modified 5.34 version and
will be refactored separately. Check for HAVE_SIGNAL_H is therefore
still done in the configure.ac.
Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4
Changes:
- AC_TYPE_SIZE_T called on only one place (configure.ac)
- AC_FUNC_ALLOCA called on only one place (configure.ac)
- AC_TYPE_UID_T called on only one place (configure.ac)
- HAVE_STRSTR removed since strstr is part of C89 standard [1]
- Remove checks for strtol and strpbrk
- Checking for the presence of perror function is not needed anymore
since it is part of C89 standard and PHP calls it unconditionally.
- Checking for functions strdup, setenv, strerror, and memmove done only
on one place (configure.ac)
- outdated check for snprintf removed
1: https://port70.net/~nsz/c/c89/c89-draft.html
