bpf: reuse subprog argument parsing logic for subprog call checks

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Remove duplicated BTF parsing logic when it comes to subprog call check.
Instead, use (potentially cached) results of btf_prepare_func_args() to
abstract away expectations of each subprog argument in generic terms
(e.g., "this is pointer to context", or "this is a pointer to memory of
size X"), and then use those simple high-level argument type
expectations to validate actual register states to check if they match
expectations.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231215011334.2307144-6-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Andrii Nakryiko 2023-12-14 17:13:29 -08:00 • committed by Alexei Starovoitov

parent c5a7244759

commit f18c3d88de

2 changed files with 31 additions and 81 deletions

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110

kernel/bpf/verifier.c

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2

tools/testing/selftests/bpf/progs/test_global_func5.c

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