On Sun, Feb 28, 2021 at 1:16 PM ASSI <strom...@nexgo.de> wrote: > > Christoph Reiter via Cygwin writes: > > binutils 2.36 now defaults to ASLR etc on Windows, so a cygwin compiled > > linker > > will give you: > > > >> peflags -v mydll.dll > > mydll.dll: coff(0x2026[+executable_image,+line_nums_stripped,+bigaddr,+dll]) > > pe(0x0160[+high-entropy-va,+dynamicbase,+nxcompat]) > > > > Is this still problematic for cygwin? > > Yes it is and I'm currently figuring out how to best get rid of it in > order to be able to update binutils (why this was ever allowed in > without an accompanying configure option is a mystery to me).
OK, thanks (nxcompat as well btw?). I've reverted these changes in MSYS2 now: https://github.com/msys2/MSYS2-packages/commit/c5757a43b42fb20730792469facf9a65571a2e81 > I've > already nixed it for Cygwin, but I'm not yet sure what to do for the > cross compilation toolchain. While it should in principle work there, > I'm pretty sure that there will be problems when it comes to the nitty > gritty details. It's already transpired that some of the linker scripts > can't deal with the larger base addresses this change does generate > eventually. MSYS2 builds all packages with ASLR since 6 months, so things look good. We've added a patch that allows reverting the base address if needed: https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-binutils/2001-ld-option-to-move-default-bases-under-4GB.patch > > The reason I'm asking is because we updated to 2.36 in MSYS2 and are > > wondering if we need to patch this out (or change the defaults) It > > seems to work as is right now, but maybe we are just lucky(?). > > You are just lucky and need to test more. :-) > > Note that the change does not only affect DLL as the commit message > would want you to believe and you will eventually end up with a > situation where ASLR tries moves the stack of an executable, at which > point you can no longer fork. OK, thanks. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
