On Fri, 2019-06-07 at 15:27 -0700, Andy Lutomirski wrote: > > On Jun 7, 2019, at 2:09 PM, Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > > > > On 6/7/19 1:06 PM, Yu-cheng Yu wrote: > > > > Huh, how does glibc know about all possible past and future legacy code > > > > in the application? > > > > > > When dlopen() gets a legacy binary and the policy allows that, it will > > > manage > > > the bitmap: > > > > > > If a bitmap has not been created, create one. > > > Set bits for the legacy code being loaded. > > > > I was thinking about code that doesn't go through GLIBC like JITs. > > CRIU is another consideration: it would be rather annoying if CET programs > can’t migrate between LA57 and normal machines. When a machine migrates, does its applications' addresses change? If no, then the bitmap should still work, right? Yu-cheng
