bpf: Assign ID to scalars on spill

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Currently, when a scalar bounded register is spilled to the stack, its
ID is preserved, but only if was already assigned, i.e. if this register
was MOVed before.

Assign an ID on spill if none is set, so that equal scalars could be
tracked if a register is spilled to the stack and filled into another
register.

One test is adjusted to reflect the change in register IDs.

Signed-off-by: Maxim Mikityanskiy <maxim@isovalent.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20240108205209.838365-9-maxtram95@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Maxim Mikityanskiy 2024-01-08 22:52:02 +02:00 • committed by Alexei Starovoitov

parent 87e51ac6cb

commit 8ecfc371d8

3 changed files with 11 additions and 5 deletions

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8

kernel/bpf/verifier.c

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2

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

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6

tools/testing/selftests/bpf/verifier/precise.c

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