Messages in this thread | | | From | Andrew Lutomirski <> | Date | Tue, 31 May 2011 12:10:40 -0400 | Subject | Re: [PATCH v4 09/10] x86-64: Randomize int 0xcc magic al values at boot |
| |
On Tue, May 31, 2011 at 11:56 AM, Andrew Lutomirski <luto@mit.edu> wrote: > We could scrap int 0xcc entirely and emulate on page fault, but that > is slower and has other problems (like breaking anything that thinks > it can look at a call target in a binary and dereference that > address). > > Here's a possibly dumb/evil idea: > > Put real syscalls in the vsyscall page but mark the page NX. Then > emulate the vsyscalls on the PF_INSTR fault when userspace jumps to > the correct address but send SIGSEGV for the wrong address. > > Down side: it's even more complexity for the same silly case.
Scratch that. It's incompatible with keeping time() fast for now.
> > --Andy > >> >> Thanks, >> >> Ingo >> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |