[uml-devel] [PATCH] UML: Use PTRACE_KILL instead of SIGKILL to kill host-OS processes

[Chris Wedgwood <cw@f00f.org>]

kill(..., SIGKILL) doesn't work to kill host-OS processes created in
the exec path in TT mode --- for this we need PTRACE_KILL (it did work
in previous kernels, but not by design).  Without this process will
accumulate on the host-OS (although the won't be visible inside UML).

Signed-off-by: Chris Wedgwood <cw@f00f.org>
---

Yes, there are other fixes along these lines which are needed but one
at a time as we test these...

Index: cw-current/arch/um/kernel/tt/exec_user.c
===================================================================
--- cw-current.orig/arch/um/kernel/tt/exec_user.c	2004-11-03 02:10:18.064830204 -0800
+++ cw-current/arch/um/kernel/tt/exec_user.c	2004-11-03 02:12:10.447716745 -0800
@@ -35,7 +35,8 @@
 		tracer_panic("do_exec failed to get registers - errno = %d",
 			     errno);
 
-	kill(old_pid, SIGKILL);
+	if (ptrace(PTRACE_KILL, old_pid, NULL, NULL))
+		printk("Warning: ptrace(PTRACE_KILL, %d, ...) saw %d\n", errno);
 
 	if(ptrace_setregs(new_pid, regs) < 0)
 		tracer_panic("do_exec failed to start new proc - errno = %d",


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