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

Todd Fiala tfiala at google.com
Fri Aug 15 06:52:42 PDT 2014

Thanks all.

I'm going to start looking into this today.

On Fri, Aug 15, 2014 at 1:00 AM, Colin Riley <colin at codeplay.com> wrote:

>  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.
> Colin
> 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> 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 |  650-943-3180
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> --
> - Colin Riley
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Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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