Eduard Zingerman 904e6ddf41
bpf: Use scalar ids in mark_chain_precision() ...
Change mark_chain_precision() to track precision in situations
like below:
r2 = unknown value
...
--- state #0 ---
...
r1 = r2 // r1 and r2 now share the same ID
...
--- state #1 {r1.id = A, r2.id = A} ---
...
if (r2 > 10) goto exit; // find_equal_scalars() assigns range to r1
...
--- state #2 {r1.id = A, r2.id = A} ---
r3 = r10
r3 += r1 // need to mark both r1 and r2
At the beginning of the processing of each state, ensure that if a
register with a scalar ID is marked as precise, all registers sharing
this ID are also marked as precise.
This property would be used by a follow-up change in regsafe().
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com >
Signed-off-by: Andrii Nakryiko <andrii@kernel.org >
Acked-by: Andrii Nakryiko <andrii@kernel.org >
Link: https://lore.kernel.org/bpf/20230613153824.3324830-2-eddyz87@gmail.com
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904e6ddf41