Date: Fri, 20 Jan 2023 16:32:10 +0100
To: cygwin@cygwin.com
Subject: Re: Error: child_copy: cygheap read copy failed.
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From: Corinna Vinschen via Cygwin <cygwin@cygwin.com>
Reply-To: cygwin@cygwin.com
Cc: Corinna Vinschen <corinna-cygwin@cygwin.com>
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On Jan 20 22:30, Takashi Yano via Cygwin wrote:
> On Fri, 20 Jan 2023 13:26:20 +0100
> Corinna Vinschen wrote:
> > On Jan 20 21:18, Takashi Yano via Cygwin wrote:
> > > On Fri, 20 Jan 2023 12:30:29 +0100
> > > Corinna Vinschen wrote:
> > > > Also, your ffplay executable isn't high-entropy-VA enabled, by any
> > > > chance?
> > > 
> > > I'm sorry, but the high-entropy-va is ebabled.
> > > 
> > > $ peflags -v /usr/bin/ff{mpeg,probe,play}
> > > /usr/bin/ffmpeg: coff(0x022e[+executable_image,+line_nums_stripped,+local_syms_stripped,+bigaddr,+sepdbg]) pe(0x8160[+high-entropy-va,+dynamicbase,+nxcompat,+tsaware])
> > > /usr/bin/ffprobe: coff(0x022e[+executable_image,+line_nums_stripped,+local_syms_stripped,+bigaddr,+sepdbg]) pe(0x8160[+high-entropy-va,+dynamicbase,+nxcompat,+tsaware])
> > > /usr/bin/ffplay: coff(0x022e[+executable_image,+line_nums_stripped,+local_syms_stripped,+bigaddr,+sepdbg]) pe(0x8160[+high-entropy-va,+dynamicbase,+nxcompat,+tsaware])
> > 
> > Btw., how did this happen?  The native Cygwin compiler/linker combo
> > usually doesn't set the dynamicbase and high-entropy-VA flags by
> > default...
> 
> Perhaps this is because configure of ffmpeg explicitly
> has the following lines:
> 
> check_ldflags -Wl,--nxcompat,--dynamicbase
> check_ldflags -Wl,--high-entropy-va # binutils 2.25

Oh, ok. The configurey should only do that on native Windows builds.

> Removing these lines makes ff{mpeg,probe,play} disable
> both high-entropy-va and dynamicbase flags.

Great!


Thanks,
Corinna

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