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So today #musl discovered a longstanding 🤦🤦🤦 bug in Linux's ELF loader...
For whatever reason, Linux has two copies of the ELF loading code in binfmt_elf.c, one for the main program and the other for the "program interpreter" (dynamic linker). The former handles BSS right but the latter doesn't.
ELF program LOAD segments can have p_memsz>p_filesz, representing a mapping larger in memory than in the image on disk, with the remainder zero-filled (mapping zero paged if needed).
