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[Bug 63885] New: shifting into sign bit in mod_access_compat.c is undefined behaviour
https://bz.apache.org/bugzilla/show_bug.cgi?id=63885

Bug ID: 63885
Summary: shifting into sign bit in mod_access_compat.c is
undefined behaviour
Product: Apache httpd-2
Version: 2.4.41
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_access_compat
Assignee: bugs@httpd.apache.org
Reporter: apachebugzilla@pauldreik.se
Target Milestone: ---

I built apache with undefined behaviour sanitizer on, and the the resulting
binary complains on this row:
https://github.com/apache/httpd/blob/402ea113bbd93eef00e66ba0caaef75df15cd0e8/modules/aaa/mod_access_compat.c#L112

It gives the following error:
okt 26 21:40:02 torsken apachectl[27317]: mod_access_compat.c:112:43: runtime
error: left shift of 1 by 63 places cannot be represented in type 'long int'

The above was made by modifying the debian package instead of using the
upstream version but it seems relevant also on 2.4.41.

I tried to build the latest version from svn, but it failed when I tried to
point out the path to the apr executable to buildconf and I gave up after a
while.

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