The verifier.c:regsafe() has the following shortcut:

	equal = memcmp(rold, rcur, offsetof(struct bpf_reg_state, parent)) == 0;
	...
	if (equal)
		return true;

Which is executed regardless old register type. This is incorrect for
register types that might have an ID checked by check_ids(), namely:
 - PTR_TO_MAP_KEY
 - PTR_TO_MAP_VALUE
 - PTR_TO_PACKET_META
 - PTR_TO_PACKET

The following pattern could be used to exploit this:

  0: r9 = map_lookup_elem(...)  ; Returns PTR_TO_MAP_VALUE_OR_NULL id=1.
  1: r8 = map_lookup_elem(...)  ; Returns PTR_TO_MAP_VALUE_OR_NULL id=2.
  2: r7 = ktime_get_ns()        ; Unbound SCALAR_VALUE.
  3: r6 = ktime_get_ns()        ; Unbound SCALAR_VALUE.
  4: if r6 > r7 goto +1         ; No new information about the state
                                ; is derived from this check, thus
                                ; produced verifier states differ only
                                ; in 'insn_idx'.
  5: r9 = r8                    ; Optionally make r9.id == r8.id.
  --- checkpoint ---            ; Assume is_state_visisted() creates a
                                ; checkpoint here.
  6: if r9 == 0 goto <exit>     ; Nullness info is propagated to all
                                ; registers with matching ID.
  7: r1 = *(u64 *) r8           ; Not always safe.

Verifier first visits path 1-7 where r8 is verified to be not null
at (6). Later the jump from 4 to 6 is examined. The checkpoint for (6)
looks as follows:
  R8_rD=map_value_or_null(id=2,off=0,ks=4,vs=8,imm=0)
  R9_rwD=map_value_or_null(id=2,off=0,ks=4,vs=8,imm=0)
  R10=fp0

The current state is:
  R0=... R6=... R7=... fp-8=...
  R8=map_value_or_null(id=2,off=0,ks=4,vs=8,imm=0)
  R9=map_value_or_null(id=1,off=0,ks=4,vs=8,imm=0)
  R10=fp0

Note that R8 states are byte-to-byte identical, so regsafe() would
exit early and skip call to check_ids(), thus ID mapping 2->2 will not
be added to 'idmap'. Next, states for R9 are compared: these are not
identical and check_ids() is executed, but 'idmap' is empty, so
check_ids() adds mapping 2->1 to 'idmap' and returns success.

This commit pushes the 'equal' down to register types that don't need
check_ids().
Signed-off-by: NEduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20221209135733.28851-2-eddyz87@gmail.comSigned-off-by: NAlexei Starovoitov <ast@kernel.org>