From 6ea6dd93c9454cc9521134f907bc970d09f460e4 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Tue, 27 Nov 2007 13:02:40 +0100 Subject: [PATCH] ptrace: Call arch_ptrace_attach() when request=PTRACE_TRACEME arch_ptrace_attach() is a hook that allows the architecture to do book-keeping after a ptrace attach. This patch adds a call to this hook when handling a PTRACE_TRACEME request as well. Currently only one architecture, m32r, implements this hook. When called, it initializes a number of debug trap slots in the ptraced task's thread struct, and it looks to me like this is the right thing to do after a PTRACE_TRACEME request as well, not only after PTRACE_ATTACH. Please correct me if I'm wrong. I want to use this hook on AVR32 to turn the debugging hardware on when a process is actually being debugged and keep it off otherwise. To be able to do this, I need to intercept PTRACE_TRACEME and PTRACE_ATTACH, as well as PTRACE_DETACH and thread exit. The latter two can be handled by existing hooks. Signed-off-by: Haavard Skinnemoen --- kernel/ptrace.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/ptrace.c b/kernel/ptrace.c index c25db863081..c719bb9d79a 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -470,6 +470,8 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data) lock_kernel(); if (request == PTRACE_TRACEME) { ret = ptrace_traceme(); + if (!ret) + arch_ptrace_attach(current); goto out; }