Messages in this thread | | | Date | Mon, 22 Aug 2011 03:07:38 +0100 | From | Al Viro <> | Subject | Re: SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) |
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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.
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