Re: [Qemu-devel] [PATCH v2 11/15] gdbstub: add support for vAttach packets

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Hi Luc,

On 01/10/2018 13:57, Luc Michel wrote:
> Add support for the vAttach packets. In multiprocess mode, GDB sends
> them to attach to additional processes.
> 
> Signed-off-by: Luc Michel <luc.michel@greensocs.com>
> ---
>  gdbstub.c | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/gdbstub.c b/gdbstub.c
> index d372972dd3..b6de821025 100644
> --- a/gdbstub.c
> +++ b/gdbstub.c
> @@ -1326,10 +1326,42 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
>                      break;
>                  }
>                  goto unknown_command;
>              }
>              break;
> +        } else if (strncmp(p, "Attach", 6) == 0) {

Shouldn't this be strncmp("Attach;", 7)?

> +            unsigned long pid;
> +
> +            p += 7;
> +
> +            qemu_strtoul(p, &p, 16, &pid);

You should check for EINVAL/ERANGE here.

Rest of the patch is OK.

> +
> +            process = gdb_get_process(s, pid);
> +
> +            if (process == NULL) {
> +                put_packet(s, "E22");
> +                break;
> +            }
> +
> +            cpu = get_first_cpu_in_process(s, process);
> +
> +            if (cpu == NULL) {
> +                /* Refuse to attach an empty process */
> +                put_packet(s, "E22");
> +                break;
> +            }
> +
> +            process->attached = true;
> +
> +            s->g_cpu = cpu;
> +            s->c_cpu = cpu;
> +
> +            snprintf(buf, sizeof(buf), "T%02xthread:%s;", GDB_SIGNAL_TRAP,
> +                     gdb_fmt_thread_id(s, cpu, thread_id, sizeof(thread_id)));
> +
> +            put_packet(s, buf);
> +            break;
>          } else {
>              goto unknown_command;
>          }
>      case 'k':
>          /* Kill the target */
>