tree 6af86387e67804ce0b375367811af02fb9b04ac3
parent 679c782de14bd48c19dd74cd1af20a2bc05dd936
author Edward Cree <ecree@solarflare.com> 1534964564 +0100
committer Alexei Starovoitov <ast@kernel.org> 1535593932 -0700

bpf/verifier: display non-spill stack slot types in print_verifier_state

If a stack slot does not hold a spilled register (STACK_SPILL), then each
 of its eight bytes could potentially have a different slot_type.  This
 information can be important for debugging, and previously we either did
 not print anything for the stack slot, or just printed fp-X=0 in the case
 where its first byte was STACK_ZERO.
Instead, print eight characters with either 0 (STACK_ZERO), m (STACK_MISC)
 or ? (STACK_INVALID) for any stack slot which is neither STACK_SPILL nor
 entirely STACK_INVALID.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>