Re: [Gcl-devel] address@hidden: Re: Executable memory: some apps that work on RH9 don't on FC1]

[Camm Maguire]

Greetings!

Tim Daly  <address@hidden> writes:

> Further information from the fedora devel list:
> 
> From: Roland McGrath <address@hidden>
> Subject: Re: Executable memory: some apps that work on RH9 don't on FC1
> To: address@hidden
> 
> 
> You can disable the exec-shield functionality globally with
> /proc/sys/kernel/exec-shield, but that doesn't do anything different for an
> older binary that is not marked or for a binary that is marked as requiring
> executable stack.  exec-shield is always disabled for those execs.
> 
> The issue you are having is probably that malloc does not use PROT_EXEC in
> its mmap-based allocations.  Executability should be enabled in the brk
> area when exec-shield is disabled.  Verify the situation by looking at
> /proc/PID/maps for the process in question.
> 

Just one other clarification:  GCL redefines malloc as a pathway
through its own sbrk-generated, gbc managed memory system.  Again,
don't see the relevance (yet) from the failuire as reported.

Take care,

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-- 
Camm Maguire                                            address@hidden
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