On Fri, Sep 26, 2014 at 3:07 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > On Fri, Sep 26, 2014 at 3:03 PM, Alexei Starovoitov <ast@xxxxxxxxxxxx> wrote: >> On Fri, Sep 26, 2014 at 2:47 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: >>> >>> Can't you just disallow the 1-byte write to the stack? >> >> of course not. >> That would be extremely limiting to users. >> Can you actually see yourself living with stack that only >> allows 8-byte writes/reads? >> The stack usage will increase a lot, since all char/short >> stack variables will become 8-byte... > > How about requiring that sub-8-byte stack accesses only be to integer slots? you mean to reject the sub-8-byte write early if it's going into space where pointers were stored? That will limit stack reuse. gcc/llvm generate code where the same stack location is used by different variables during life of the function. So if I reject the write early, it will break otherwise valid programs. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
