[lldb-dev] ASLR disabled by default - thoughts?

Colin Riley colin at codeplay.com
Fri Aug 15 01:00:00 PDT 2014

I'd agree with the default behavior being off and the command being 
changed to an enable style. All targets we have worked with certainly 
default to off, or don't have the feature at all.


On 15/08/2014 01:45, Eric Christopher wrote:
> I believe that disabling by default would match the gdb behavior yes? 
> If nothing else, yes, I'm a fan of this :)
> -eric
> On Thu Aug 14 2014 at 5:30:52 PM Todd Fiala <tfiala at google.com 
> <mailto:tfiala at google.com>> wrote:
>     Hey all,
>     Regarding this bug:
>     http://llvm.org/bugs/show_bug.cgi?id=20658
>     We've been discussing the idea of having ASLR disabled by default
>     when launching processes within lldb.  Currently it looks like the
>     default behavior is to have it enabled, and require explicitly
>     disabling to get that behavior for the process.
>     It seems like it might make more sense to have it disabled by
>     default - that way code references would likely be static across
>     debugger runs, which seems to be more what we want when tracking
>     down issues across code runs.
>     Any thoughts on this?
>     The counterargument I could make for changing it would be (aside
>     from legacy compatibility issues perhaps on the MacOSX/iOS side) -
>     taking the exe out of its native state on the OS.  If a bug is
>     ASLR sensitive, the user might miss it.  And so behavior in the
>     debugger could differ from the exe in its native state.  Not sure
>     how relevant that is for the majority of usages, though.
>     I'll be fixing the fact that Linux is ignoring this altogether.
>      But while I'm in there, I could flip the default if we wanted to
>     do it.  If not globally, we'd probably pursue defaulting it on
>     Linux (and Ed seems to like it for FreeBSD as well, so maybe for
>     not Apple in that case?)
>     -- 
>     Todd Fiala | 	 Software Engineer | 	tfiala at google.com
>     <mailto:tfiala at google.com> | 	650-943-3180
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- Colin Riley
Games Technology Director

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