diff options
| author | Eduard Zingerman <[email protected]> | 2024-01-08 22:51:57 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <[email protected]> | 2024-01-23 14:40:22 -0800 |
| commit | c035b3e555b5642f786fb2d089a6ddf7b00eb374 (patch) | |
| tree | 568c8bfd477b4610624c43ebcd1dd0137ea95ca8 | |
| parent | d5b892fd607abec2a1e49b6a2afc278c329a0ee2 (diff) | |
selftests/bpf: check if imprecise stack spills confuse infinite loop detection
Verify that infinite loop detection logic separates states with
identical register states but different imprecise scalars spilled to
stack.
Signed-off-by: Eduard Zingerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_loops1.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_loops1.c b/tools/testing/selftests/bpf/progs/verifier_loops1.c index 71735dbf33d4..e07b43b78fd2 100644 --- a/tools/testing/selftests/bpf/progs/verifier_loops1.c +++ b/tools/testing/selftests/bpf/progs/verifier_loops1.c @@ -259,4 +259,28 @@ l0_%=: r2 += r1; \ " ::: __clobber_all); } +SEC("xdp") +__success +__naked void not_an_inifinite_loop(void) +{ + asm volatile (" \ + call %[bpf_get_prandom_u32]; \ + r0 &= 0xff; \ + *(u64 *)(r10 - 8) = r0; \ + r0 = 0; \ +loop_%=: \ + r0 = *(u64 *)(r10 - 8); \ + if r0 > 10 goto exit_%=; \ + r0 += 1; \ + *(u64 *)(r10 - 8) = r0; \ + r0 = 0; \ + goto loop_%=; \ +exit_%=: \ + r0 = 0; \ + exit; \ +" : + : __imm(bpf_get_prandom_u32) + : __clobber_all); +} + char _license[] SEC("license") = "GPL"; |