On Tue, Apr 28, 2020 at 2:05 PM Jeremy Kerr <jk@xxxxxxxxxx> wrote: > > Currently, we may perform a copy_to_user (through > simple_read_from_buffer()) while holding a context's register_lock, > while accessing the context save area. > > This change uses a temporary buffers for the context save area data, > which we then pass to simple_read_from_buffer. > > Signed-off-by: Jeremy Kerr <jk@xxxxxxxxxx> > --- Thanks for fixing this! I wonder how far it should be backported, given that this has been broken for 14 years now. Fixes: bf1ab978be23 ("[POWERPC] coredump: Add SPU elf notes to coredump.") Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>