From: [EMAIL PROTECTED]
Operating system: linux-2.2.18
PHP version: 4.0.4pl1
PHP Bug Type: Reproduceable crash
Bug description: crash when accessing shared memory + more info on bug #8985
hello,
when accessing a shared memory region that i don't have access to (because of the
permissions), php segfaults.
so if i have a shared memory region created by another user with key 0x123 and
permissions 0600 and call shm_attach(0x123), php crashes:
<?
$shmid = shm_attach(0x123);
shm_detach(0x123);
?>
also, i know some more info concerning the bug #8985: when one process is reading
some variable from the shared memory and some other is writing _another_ variable to
the same shared memory region, the data gets corrupted - possibly because of the
reorganizing before each shm_put_var(). while this is understandable (shm_put_var()
first removes the variable, reorganizes the region and writes the variable back), it
renders this extension almost unusable in multitasking environments because a big
global lock for the whole shared memory region is needed.
i can supply more information if needed of course.
thanks,
Michal Vitecek
--
Edit Bug report at: http://bugs.php.net/?id=9259&edit=1
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