From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Date: Fri, 21 Feb 2020 18:59:03 +0000 > Again, a couple of copy_regset_to_user(), but there's an additional > twist - GETREGSET of 32bit task on sparc64 will use access_process_vm() > when trying to fetch L0..L7/I0..I7 of other task, using copy_from_user() > only when the target is equal to current. For sparc32 this is not > true - it's always copy_from_user() there, so the values it reports > for those registers have nothing to do with the target process. That > part smells like a bug; by the time GETREGSET had been introduced > sparc32 was not getting much attention, GETREGS worked just fine > (not reporting L*/I* anyway) and for coredump it was accessing the > caller's memory. Not sure if anyone cares at that point... That's definitely a bug and sparc64 is doing it correctly.
