bpf: Classify scalar kfunc arguments from BTF

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Add kfunc scalar argument types, classify them in get_kfunc_arg_type()
along side with pointer arguments and move scalar type verification
into the main switch in check_kfunc_args(). This keeps BTF-based
classification separate from register validation for every argument,
paving the way for generating the kfunc argument prototype at add-call
time. No functional change intended.

KF_ARG_MEM_SIZE and KF_ARG_CONST_MEM_SIZE now are reachable. Therefore,
remove the fallthrough from KF_ARG_PTR_TO_MEM case and adjust the
register indexing.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Reviewed-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260801074633.1595644-18-ameryhung@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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Amery Hung 2026-08-01 00:46:32 -07:00 • committed by Kumar Kartikeya Dwivedi

parent ba5b99470c

commit 1690dcf27c

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2 changed files with 92 additions and 51 deletions

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141

kernel/bpf/verifier.c

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2

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

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