selftests/bpf: track string payload offset as scalar in strobemeta

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commit 87eb0152bc upstream.

This change prepares strobemeta for update in callbacks verification
logic. To allow bpf_loop() verification converge when multiple
callback iterations are considered:
- track offset inside strobemeta_payload->payload directly as scalar
  value;
- at each iteration make sure that remaining
  strobemeta_payload->payload capacity is sufficient for execution of
  read_{map,str}_var functions;
- make sure that offset is tracked as unbound scalar between
  iterations, otherwise verifier won't be able infer that bpf_loop
  callback reaches identical states.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20231121020701.26440-3-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eduard Zingerman 2023-11-21 04:06:52 +02:00 • committed by Greg Kroah-Hartman

parent d9631d0d8c

commit e030da5f51

1 changed files with 48 additions and 30 deletions

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tools/testing/selftests/bpf/progs/strobemeta.h

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