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diff --git a/build_msvc/README.md b/build_msvc/README.md index 5ce0f6cde4..7c1704d30f 100644 --- a/build_msvc/README.md +++ b/build_msvc/README.md @@ -81,3 +81,25 @@ For safety reasons the Bitcoin Core .appveyor.yml file has the artifact options #- 7z a bitcoin-%APPVEYOR_BUILD_VERSION%.zip %APPVEYOR_BUILD_FOLDER%\build_msvc\%platform%\%configuration%\*.exe #- path: bitcoin-%APPVEYOR_BUILD_VERSION%.zip ``` + +Security +--------------------- +[Base address randomization](https://docs.microsoft.com/en-us/cpp/build/reference/dynamicbase-use-address-space-layout-randomization?view=msvc-160) is used to make Bitcoin Core more secure. When building Bitcoin using the `build_msvc` process base address randomization can be disabled by editing `common.init.vcproj` to change `RandomizedBaseAddress` from `true` to `false` and then rebuilding the project. + +To check if `bitcoind` has `RandomizedBaseAddress` enabled or disabled run + +``` +.\dumpbin.exe /headers src/bitcoind.exe +``` + +If is it enabled then in the output `Dynamic base` will be listed in the `DLL characteristics` under `OPTIONAL HEADER VALUES` as shown below + +``` + 8160 DLL characteristics + High Entropy Virtual Addresses + Dynamic base + NX compatible + Terminal Server Aware +``` + +This may not disable all stack randomization as versions of windows employ additional stack randomization protections. These protections must be turned off in the OS configuration.
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