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Subject: Re: Fork issue on W10 WOW
To: cygwin AT cygwin DOT com
References: <7ad0e0d4-438b-33ad-a711-e0b1996fa6f6 AT gmail DOT com> <c1505248-8d03-c0b6-37ca-9c6eed2100e9 AT cornell DOT edu> <c618e65c-ab40-287d-39fb-d9daa9ef858a AT gmail DOT com> <20180709090332 DOT GC3111 AT calimero DOT vinschen DOT de>
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID: <87e94b8c-13d0-928e-957d-c32b15b8a962@gmail.com>
Date: Mon, 9 Jul 2018 13:37:08 +0200
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Am 7/9/2018 um 11:03 AM schrieb Corinna Vinschen:
> On Jul  8 18:03, Marco Atzeri wrote:
>> Am 30.06.2018 um 22:47 schrieb Ken Brown:
>>> On 6/30/2018 11:52 AM, Marco Atzeri wrote:
>>>
>>> I've never had this problem with my own 32bit installation on W10, but I
>>> just reproduced it by doing a new installation with your list of
>>> packages.  Have you tried just installing a minimal list of packages
>>> that you need for building the packages you maintain?
>>>
>>
>> On a fresh minimal installation the problem can arise again
>>
>> $ cygcheck -cd |wc -l
>> 245
>>
>> as the first system shared libs are lower than the rebase
>> DefaultBaseAddress=0x070000000
>>
>> 6F810000-6F811000 r--p  /cygdrive/c/Windows/System32/wow64.dll
>> 6F811000-6F844000 r-xp  /cygdrive/c/Windows/System32/wow64.dll
>>
>> I think that rebase should consider different rebase
>> base address for W10.
>>
>> Using DefaultBaseAddress=0x06F000000 seems fine
>> for the time being
> 
> I can do that in the rebaseall script (I have a matching patch locally),
> but it looks like a race we can't win in the long run.  240 Megs less
> space is a lot given the number of DLLs in the distro.

I know, but until we try to support the 32bit version, we need a
way to handle it.

> To make matters worse, I just checked my local 32 bit W10 and it turns
> out that various Windows DLLs loaded by default (even in a simple tcsh)
> are at even lower addresses, e.g.
> 
>    6B690000-6B6A3000 /mnt/c/Windows/System32/netapi32.dll

I suspect it is due the their 64bit base address

  $ objdump -x /cygdrive/c/Windows/System32/wow64.dll|grep ImageBase
ImageBase               000000006b000000

  $ objdump -x /cygdrive/c/Windows/System32/wow64win.dll |grep ImageBase
ImageBase               000000006b180000


It is like they put the 64bit System 32 over 0x6b000000 (maybe)
and the WoW64 over 0x70000000

But I guess that ALSR can play around that numbers.
There is still a way to disable ALSR?


> Corinna
Marco

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