Re: Page fault outside of application

On Mon, 2018-01-29 at 11:43 +0200, Nadav Har'El wrote: > 1. Your compiler defaults to "full relro" (-Wl,-z,now -Wl,-z,relro) > but for some reason object::relocate_pltgot() doesn't recognize the > bind_now. FWIW, on both workign and non-working builds, I see '-pie -z now -z relro' being passed to

Re: Page fault outside of application

On Mon, 2018-01-29 at 12:27 +0200, Nadav Har'El wrote: > Both versions used "-pie", not "-shared"? Should be, yes. Its exactly the same build setup and the Makefile shows '-pie' for LDFLAGS. I don't think gcc7.2 contains any of the -mindirect-branch changes, so thats a red-herring. I'll continue

Re: Page fault outside of application

On Mon, 2018-01-29 at 11:43 +0200, Nadav Har'El wrote: > > Hmm, I don't know, I wasn't aware anything like that changed. > We usually change parts of the object marked by PT_GNU_RELRO to read- > only in object::fix_permissions(), I'm guessing (but didn't check) > this what caused the read-only

Re: Page fault outside of application

On Mon, Jan 29, 2018 at 11:20 AM, Rick Payne wrote: > On Mon, 2018-01-29 at 10:54 +0200, Nadav Har'El wrote: > > This all seems reasonable. > Maybe we somehow got the PLT becoming read-only, so we are getting a > pagefault trying to write to it? > Can you please try in gdb

Re: Page fault outside of application

On Mon, 2018-01-29 at 10:54 +0200, Nadav Har'El wrote: > This all seems reasonable. > Maybe we somehow got the PLT becoming read-only, so we are getting a > pagefault trying to write to it? > Can you please try in gdb "osv mmap" and look at the mapping which > includes the faulting address

Re: Page fault outside of application

On Wed, Jan 24, 2018 at 11:07 AM, Rick Payne wrote: > Hi, > > On 23/01/18 20:16, Nadav Har'El wrote: > >> I don't have any bright ideas, but just a few small comments below, >> hopefully (?) they will help something... >> > > Appreciated... > > This writes in "addr", which