Date: Wed, 10 Jun 2020 12:31:02 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: Norbert Lange <nolange79@...il.com> Cc: musl@...ts.openwall.com Subject: Re: Mark stack as non-executable in asm * Norbert Lange <nolange79@...il.com> [2020-06-10 11:24:04 +0200]: > I did borrow some assembler files to avoid having to link against > (any) libc. That was for building a DSO, ultimately loaded via glibc. > The effect was that glibc did change the protection of all stacks to > be executable. > > Would you consider adding the line  > .section .note.GNU-stack, "", %progbits > to assembly files? > > I know this is not a musl bug, and I can easily add the lines myself. musl build system (just like other libcs i know of) pass -noexecstack to the assembler so if you build the asm files as part of libc the object files should have the marking, if you build outside of libc i think it's your responsibility to add the note (either to the asm or via the -Wa,-noexecstack flag) readelf -lW libfoo.so | grep GNU_STACK is one way to verify that everything has the note. > > regards, Norbert > >  - https://wiki.ubuntu.com/SecurityTeam/Roadmap/ExecutableStacks
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