Am Fri, Apr 05, 2024 at 05:58:15AM +0000 schrieb Thorsten Glaser: > Markus Wichmann dixit: > >In any case, the emission of non-relative relocations is the issue here, > >and it is coming from the linker. > > They are present in the glibc static-pie binary as well, though. > And tbh they look to me like “just plug the absolute address of > the symbol here, please”, which is perfectly fine for things like > an array of strings when the actual string has already its own symbol. > > (Disclaimer: I know… barely anything about Unix relocation types, > a bit more about those on DOS and even TOS.) >
Then glibc's static-pie startup code also processes symbolic relocations. musl's doesn't. It only processes relative relocations. And changing this would require some massive reworking. We'd somehow have to put stage 2 of the dynamic linker into rcrt1.o. A symbolic lookup doesn't really make sense for a static executable outside of FDPIC. The only difference in address space possible is a relative offset. In order to do a symbolic relocation, you also need the symbol lookup stuff, which - granted - for a static PIE is probably very simple because there can be only one symbol table, but still. I thought the whole point of static-PIE support was to only leave relative relocations around. Ciao, Markus
