Andi Kleen wrote: > > Our ptrace jailer is checking cs to figure out if a task is a compat task > > or not, if the kernel can change that behind our back it means our jailer > > Every user program change it behind your back. .. > Look up far jumps in any x86 manual. I'm pretty sure this isn't about changing cs or far jumps I think Indan means code is running with 64-bit cs, but the kernel treats int $0x80 as a 32-bit syscall and sysenter as a 64-bit syscall, and there's no way for the ptracer to know which syscall the kernel will perform, even by looking at all registers. It looks like a hole in ptrace which could be fixed. -- Jamie -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
