Re: status of Linux ptrace on amd64?
Alexander Nasonov wrote: Christos Zoulas wrote: Should not be that hard, but what is that tool reading from PEEKUSER? Registers? In both cases it reads from user_regs_struct, if I understand everything correctly. But it's the first step, the tool would definitely try other things if PEEKUSER didn't fail. In fact, I'm not sure that thing would work at all because it's a dynamic instrumentation tool called Pin. It updates code on the fly. OK, I implemented reading orig_ax by PEEKUSER. It fixed ptrace failure but it added two problems: 1. I had to disable compat_linux32 to fix compilation. I need to make linux_sys_ptrace_arch multiarch-aware. 2. PEEKUSER didn't change anything. The tool still detaches its child and exits. I can't debug to see what's going on, gdb receives SIGUSR1 from the tool. I suspect PEEKUSER returns unexpected value. Alex
Re: status of Linux ptrace on amd64?
On Dec 2, 10:06pm, al...@yandex.ru (Alexander Nasonov) wrote: -- Subject: Re: status of Linux ptrace on amd64? | Alexander Nasonov wrote: | Christos Zoulas wrote: | Should not be that hard, but what is that tool reading from PEEKUSER? | Registers? | | In both cases it reads from user_regs_struct, if I understand everything | correctly. But it's the first step, the tool would definitely try other | things if PEEKUSER didn't fail. In fact, I'm not sure that thing would | work at all because it's a dynamic instrumentation tool called Pin. It | updates code on the fly. | | OK, I implemented reading orig_ax by PEEKUSER. It fixed ptrace failure | but it added two problems: | | 1. I had to disable compat_linux32 to fix compilation. I need |to make linux_sys_ptrace_arch multiarch-aware. | 2. PEEKUSER didn't change anything. The tool still detaches its child |and exits. I can't debug to see what's going on, gdb receives SIGUSR1 |from the tool. I suspect PEEKUSER returns unexpected value. Have you tried porting the tool to NetBSD? What is involved? christos
Re: status of Linux ptrace on amd64?
Christos Zoulas wrote: Have you tried porting the tool to NetBSD? What is involved? I don't think source code is available. Alex
Re: status of Linux ptrace on amd64?
In article 20141202221949.GA4053@neva, Alexander Nasonov al...@yandex.ru wrote: Christos Zoulas wrote: Have you tried porting the tool to NetBSD? What is involved? I don't think source code is available. It is going to be hard to get it to work christos
