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gh-159008: Delay load user32.dll in libcrypto on Windows #159009

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gh-159008: Delay load user32.dll in libcrypto on Windows #159009

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Windows/2026-10-07-23-48-07.gh-issue-159008.u4-k5j.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Link :file:`libcrypto-3.dll` with ``/DELAYLOAD:user32.dll`` so that
importing :mod:`hashlib` or :mod:`ssl` no longer loads :file:`user32.dll`
and its GDI dependencies into the process.
2 changes: 1 addition & 1 deletion PCbuild/openssl.vcxproj
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Expand Up @@ -67,7 +67,7 @@
set VCINSTALLDIR=$(VCInstallDir)
if not exist "$(IntDir.TrimEnd('\'))" mkdir "$(IntDir.TrimEnd('\'))"
cd /D "$(IntDir.TrimEnd('\'))"
$(Perl) "$(opensslDir)\configure" $(OpenSSLPlatform) no-asm no-uplink
$(Perl) "$(opensslDir)\configure" $(OpenSSLPlatform) no-asm no-uplink "LDFLAGS=/nologo /debug /DELAYLOAD:user32.dll" LDLIBS=delayimp.lib

@zooba zooba Oct 8, 2026

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We don't use this file to build releases anymore, it's only really still here to avoid breaking people who may have integrated it into their own builds. This change won't have any effect - it needs to go upstream first.

nmake
</NMakeBuildCommandLine>
</PropertyGroup>
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