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e693da913d
Add verifier_var_off coverage for variable-offset stack reads from spilled scalar constant zero values. Cover single-slot and cross-slot spilled zero reads, a sub-8-byte spill with neighbouring STACK_ZERO bytes, and a sub-8-byte spill with neighbouring STACK_MISC bytes that must not be treated as zero. Add verifier_spill_fill coverage for a fixed-offset stack read spanning both STACK_ZERO bytes and scalar const-zero STACK_SPILL bytes. Use verifier log assertions to check both the zero result and the precision backtracking trail. Assisted-by: opencode:gpt-5.5 Signed-off-by: Woojin Ji <random6.xyz@gmail.com> Acked-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20260625-bpf-stack-var-off-zero-v1-v3-2-a068210a761b@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>