bpf: Report Call Type Safety argument errors

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Augment selected helper and kfunc argument-contract failures with Call Type
Safety reports. Keep the existing terse verifier messages and add reason,
source context, causal register or stack-argument history, and targeted
suggestions.

Cover helper register-type mismatch, helper and kfunc non-NULL pointer
requirements, release-helper ownership requirements, scalar and constant kfunc
arguments, trusted and RCU pointer contracts, kfunc memory arguments,
memory/length pairs, refcounted kptrs, constant strings, and IRQ flag stack
arguments.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20260815064612.378577-12-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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Kumar Kartikeya Dwivedi 2026-08-15 08:46:06 +02:00 • committed by Eduard Zingerman

parent 5d57646275

commit 66e2727395

4 changed files with 388 additions and 56 deletions

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46

kernel/bpf/diagnostics.c

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3

kernel/bpf/diagnostics.h

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414

kernel/bpf/verifier.c

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1

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

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