Re: [EXAMPLE CODE] Parasite thread injection and TCP connection hijacking

Hello,

On Sat, Aug 06, 2011 at 09:15:45AM -0400, Andrew Lutomirski wrote:

On Sat, Aug 6, 2011 at 9:00 AM, Tejun Heo [off-list ref] wrote:

quoted

Actually, the only thing we need on x86_64 is two bytes for the
syscall instruction because all params are passed through registers
anyway.  We can just set up parameters for mmap, turn on single step,
point %rip to syscall in the vsyscall page.  So, either way, I don't
think this would be too difficult to solve.

Not any more -- that syscall instruction is gone as of 3.1.  You could
search through the vdso to find a syscall, but that seems fragile.

Why not just add a ptrace command to issue a syscall?

Yeah, maybe.  If this thing proves to be useful enough and looking for
a page to poke under proc too cumbersome.  I'm not against it but
don't really see strong need either at this point.

Thanks.

-- 
tejun