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Bug #66623 no EINTR check on flock(LOCK_EX)
Submitted: 2014-02-01 08:48 UTC Modified: 2014-12-10 22:49 UTC
From: php at bof dot de Assigned: yohgaki (profile)
Status: Closed Package: Session related
PHP Version: 5.6.0alpha1 OS:
Private report: No CVE-ID: None
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 [2014-02-01 08:48 UTC] php at bof dot de 
Description:
------------
Noticed a problem in ext/session/mod_files.c :

> Some syscalls can fail with EINTR, when a signal hits while within the
> kernel. This is especially true for flock(LOCK_EX) because in the
> already-locked case the second call will go to sleep for a while waiting
> for the lock to clear. But it is also possible, I think, for the
> pread/read/write calls. The usual handling for the case (-1 return &&
> errno
> == EINTR) is to just repeat the call in a while loop. I think that at
> least
> doing so for the LOCK_EX calls, would be prudent.

Re-Read the manpage (*) a bit... read/pread/write should be safe here, going 
to disk, and not a pipe or socket. But flock() will return EINTR when 
signalled and the signal handler did not use SA_RESTART. Most PHP execution 
will _probably_ okay anyway as $restart_syscalls is default true for 
pcntl_signal(), but handling would be safer anyway.

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 [2014-02-01 22:24 UTC] yohgaki@php.net
-Assigned To: +Assigned To: yohgaki
 [2014-02-01 22:28 UTC] yohgaki@php.net 
Thank you for reporting.
 [2014-10-17 13:59 UTC] tyrael@php.net 
any update on this?
 [2014-12-10 22:49 UTC] yohgaki@php.net 
I'll process my list of todos before PHP7, hopefully.
 [2015-02-03 05:08 UTC] yohgaki@php.net 
Automatic comment on behalf of yohgaki
Revision: http://git.php.net/?p=php-src.git;a=commit;h=b41a6c6f055e87d87b42bfd87fbad14a23134e4e
Log: Fixed Bug #66623 no EINTR check on flock(LOCK_EX)
 [2015-02-03 05:08 UTC] yohgaki@php.net
-Status: Assigned +Status: Closed
 
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