Peter Chubb wrote:

quoted

quoted

quoted

quoted

quoted

"Oren" == Oren Laadan [off-list ref] writes:
            

Oren> Daniel Lezcano wrote:

  

quoted

quoted

quoted

The one exception (and it is a tedious one !) are states in which
the task is already frozen by definition: any ptrace blocking
point where the tracee waits for the tracer to grant permission to
proceed with its execution. Another example is in vfork(), waiting
for completion.
        

I would say these are perfect places for "may be
non-checkpointable" :)
      

Oren> For now, yes. But we definitely want this capability in the long
Oren> run; otherwise we won't be able to checkpoint a kernel compile
Oren> ('make' uses vfork), or anything with 'gdb' running inside, or
Oren> 'strace', and other goodies.

The strace/gdb example is *really* hard; but for vfork, you just wait
until it's over. The interval between vfork and exec/exit should be
short enough not to affect the overall time for a checkpoint

A malicious user could trivially exploit that.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>