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Test for state graph backedges accumulation for SCCs formed by
bpf_loop(). Equivalent to the following C program:
int main(void) {
1: fp[-8] = bpf_get_prandom_u32();
2: fp[-16] = -32; // used in a memory access below
3: bpf_loop(7, loop_cb4, fp, 0);
4: return 0;
}
int loop_cb4(int i, void *ctx) {
5: if (unlikely(ctx[-8] > bpf_get_prandom_u32()))
6: *(u64 *)(fp + ctx[-16]) = 42; // aligned access expected
7: if (unlikely(fp[-8] > bpf_get_prandom_u32()))
8: ctx[-16] = -31; // makes said access unaligned
9: return 0;
}
If state graph backedges are not accumulated properly at the SCC
formed by loop_cb4() call from bpf_loop(), the state {ctx[-16]=-32}
injected at instruction 9 on verification path 1,2,3,5,7,9,4 would be
considered fully verified and would lack precision mark for ctx[-16].
This would lead to early pruning of verification path 1,2,3,5,7,8,9 in
state {ctx[-16]=-31}, which in turn leads to the incorrect assumption
that the above program is safe.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20251229-scc-for-callbacks-v1-2-ceadfe679900@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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