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Re: [1.7] rebaseall doesn't solve the problem

On Sat, Feb 28, 2009 at 01:47:16PM -0500, Charles Wilson wrote:
>Corinna Vinschen wrote:
>> Way cool, Chuck.  Especially the fact that this tool can also mark
>> executables with the TS-aware flag (doesn't make sense for DLLs, afaik).
>> This helps to test if setting this flag in Cygwin binaries will
>> allow Cygwin to run on 2008 with TS without disabling DEP.
>Well, the tool would need a little tweaking I think. Right now it skips
>any image (DLL or exe) that does not contain relocations.
>> If so, I'm wondering if setting the TS-aware flag shouldn't become
>> default in GCC.  What do you say, Dave?  Would that be possible?
>I'd probably wait on that for the /next/ release (e.g. after 4.3.2-2),
>so we can get aslr integerated into rebase, and the rebaseall changes
>tested.  Should I also add a switch to rebaseall that means: ONLY alsr,
>NO rebasing.  There's already a flag that allows you to add .exe's to
>the "rebase" list -- but you can't remove dll's and .so's from the list.
>Maybe the aslr functionality is different enough -- and useful in enough
>contexts that differ from rebasing -- that instead of incorporating
>'call aslr TOO' into rebaseall, there should be a separate 'aslrall' script?

It should be trivial to add this to binutils.  Doesn't it ultimately
belong in ld and (maybe) objcopy?

I can add this now but I don't think it should be the default just yet.

>> That would also allow to drop the ugly TS hack I added to Cygwin 1.7.
>> All newly built binaries would have the flag set already, and older
>> binaries could be tweaked with the aslr utility.
>That would be nice.  However, ONLY exe's linked with cygwin1.dll should
>be marked this way, right?  Not cygcheck, strace, and whatever other few
>exes we might find in the cygwin installation lists.

Do the exes themselves need this bit as well as the dlls?


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