https://issues.apache.org/bugzilla/show_bug.cgi?id=57328
Bug ID: 57328
Summary: Invalid memory access on ap_server_config_defines
Product: Apache httpd-2
Version: 2.4.10
Hardware: All
OS: Linux
Status: NEW
Severity: critical
Priority: P2
Component: Core
Assignee: [email protected]
Reporter: [email protected]
Created attachment 32268
--> https://issues.apache.org/bugzilla/attachment.cgi?id=32268&action=edit
Patch to dump elements of ap_server_config_defines after a graceful restart,
includes also fix for the problem
== Reproduction ==
1) Find attached a patch for server/core.c that dumps the elements of
ap_server_config_defines after a graceful restart.
2) Define some variables in httpd.conf, e.g.
Define arg1=val1
Define arg2=val2
Define arg3=val4
3) By doing some graceful restarts (5-10 times), the increasing number of array
elements with invalid memory references can be observerd. The problem can be
reproduced each time.
== Explanation ==
After a graceful restart, the reset_config_defines() function in server/core.c
resets ap_server_config_defines back to its original pointer
saved_server_config_defines. Henceforth, variable definitions (by means of
Define) are stored in the original array, and thus, leading to invalid memory
access upon next graceful restarts.
== Solution ==
A fix to the problem can be found in the provided patch file and be enabled by
setting the macro constant WITH_FIX to 1.
Regards, Armin
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