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Posted to bugs@httpd.apache.org by bu...@apache.org on 2007/11/22 23:47:58 UTC
DO NOT REPLY [Bug 43943] New: - SHMCB crash due to misalignment and GCC 4 optimization
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http://issues.apache.org/bugzilla/show_bug.cgi?id=43943
Summary: SHMCB crash due to misalignment and GCC 4 optimization
Product: Apache httpd-2
Version: 2.0.61
Platform: Sun
OS/Version: Solaris
Status: NEW
Keywords: PatchAvailable
Severity: normal
Priority: P2
Component: mod_ssl
AssignedTo: bugs@httpd.apache.org
ReportedBy: rainer.jung@kippdata.de
This is the same issue as BZ 38838, but here for Apache 2.0.
It has been fixed for httpd 2.2 in March 2006 with
http://svn.apache.org/viewvc?view=rev&revision=382799
The same patch fixes it for httpd 2.0.
The problem was noticed with httpd 2.0.61 compiled with gcc 4.1.2.
The memset() used in shmcb_safe_clear() got compiled as
0xfe2d726c <ssl_scache_shmcb_store+732>: clr [ %l1 ]
0xfe2d7270 <ssl_scache_shmcb_store+736>: clr [ %l1 + 4 ]
0xfe2d7274 <ssl_scache_shmcb_store+740>: clr [ %l1 + 8 ]
and the address in the register is not aligned for clr:
l1 0xfe435c17 -29139945
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