ID: 9259
Updated by: lobbin
Reported By: [EMAIL PROTECTED]
Old Status: Open
Status: Feedback
Bug Type: Semaphore related
Operating System: linux-2.2.18
PHP Version: 4.0.4pl1
New Comment:
-> feedback
Previous Comments:
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[2002-01-14 02:25:25] [EMAIL PROTECTED]
Does this happen on 4.1.1?
------------------------------------------------------------------------
[2001-02-14 08:47:01] [EMAIL PROTECTED]
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
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Edit this bug report at http://bugs.php.net/?id=9259&edit=1
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