On Fri, Sep 29, 2023 at 01:33:50PM +0200, Sebastian Ott wrote: > Hello Kees, > > On Thu, 28 Sep 2023, Kees Cook wrote: > > This is the continuation of the work Eric started for handling > > "p_memsz > p_filesz" in arbitrary segments (rather than just the last, > > BSS, segment). I've added the suggested changes: > > > > - drop unused "elf_bss" variable > > - refactor load_elf_interp() to use elf_load() > > - refactor load_elf_library() to use elf_load() > > - report padzero() errors when PROT_WRITE is present > > - drop vm_brk() > > While I was debugging the initial issue I stumbled over the following > - care to take it as part of this series? > ----->8 > [PATCH] mm: vm_brk_flags don't bail out while holding lock > > Calling vm_brk_flags() with flags set other than VM_EXEC > will exit the function without releasing the mmap_write_lock. > > Just do the sanity check before the lock is acquired. This > doesn't fix an actual issue since no caller sets a flag other > than VM_EXEC. Oh, eek. Yeah, that seems like a good idea. :) Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -Kees -- Kees Cook
