[Lldb-commits] [PATCH] Add process launch --enable-aslr option, tweak handling of flag

Todd Fiala tfiala at google.com
Mon Aug 18 12:45:47 PDT 2014

On Mon, Aug 18, 2014 at 11:22 AM, <jingham at apple.com> wrote:

> I don't think we have any other instances where we use two flags to
> express "do x" and "don't do x".

For the long options is isn't such a big deal but we try not to use up more
> short options than necessary, since this gets to be a crowded space.

I'd be happy to use long-option only here.

>   Maybe "process launch --enable-aslr <true/false>", which mirrors the
> setting anyway?
Sounds good.  But the fallback behavior when process launch doesn't specify
anything is currently to disable ASLR if the target.disable-aslr setting is
true.  Are you interested in reversing that setting to enable-aslr?  If
not, then maybe we go with just extending 'process launch --disable-aslr

In sum, I'm for either

(1) changing to either `process launch --enable-aslr <true/false>` and
change the `settings target.disable-aslr' to match the name as the fallback
setting, or

(2) keeping the target.disable-aslr setting, and extending `process launch
--disable-aslr` to take true/false.  (But - note - this does get into what
Chandler called out before as being somewhat long in the tooth - `process
launch --disable-aslr false` when you want ASLR.)

Thoughts on that?  I'll code up whatever we decide on.

If backward  compat for option (1) is a concern, we could continue to
accept `settings set disable-aslr <true/false>` and just have it do the
right thing.


> Jim
> > On Aug 17, 2014, at 10:48 PM, Todd Fiala <todd.fiala at gmail.com> wrote:
> >
> > This change modifies the logic used to set the eLaunchFlagDisableASLR
> ProcessLaunchInfo setting for inferior process launching.  Now, if 'process
> launch' is provided with either --disable-aslr or --enable-aslr, then the
> launch flag is set accordingly.  If niether --disable-aslr or --enable-aslr
> are specified, then the setting for target.disable-aslr is used to
> determine the setting or clearing of the eLaunchFlagDisableASLR setting.
> The target.disable-aslr setting currently defaults to true, so the default
> behavior when nothing is specified on the 'process launch' (i.e. 'run'
> command) is to disable ASLR.
> >
> > --
> > -Todd
> > <tfiala_enable-aslr.diff>_______________________________________________
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Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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