Re: SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weirdcrap with vdso on uml/i386)

[Al Viro]

On Sun, Aug 21, 2011 at 10:01:40PM -0400, Andrew Lutomirski wrote:

>  3. We're worried that pt_regs-using compat syscalls might want the
> regs to appear to match the actual arguments (why?)

run strace and you'll see why.

>  4. ptrace expects the "registers" when SYSCALL happens to match the
> int 0x80 convention.  (This is, IMO, sick.)

That's what ptrace is *for*.  It's there to let debuggers play with
the program being debugged, including taking a look at the syscall
arguments and modifying them.  In a predictable way, please.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/