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| author | Eduard Zingerman <eddyz87@gmail.com> | 2023-11-21 04:06:59 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-11-20 18:36:40 -0800 |
| commit | 9f3330aa644d6d979eb064c46e85c62d4b4eac75 (patch) | |
| tree | 339ae1382e4f1ac5b3f2939a3b7431e6c6a9347d | |
| parent | cafe2c21508a38cdb3ed22708842e957b2572c3e (diff) | |
| download | linux-9f3330aa644d6d979eb064c46e85c62d4b4eac75.tar.gz | |
selftests/bpf: test widening for iterating callbacks
A test case to verify that imprecise scalars widening is applied to
callback entering state, when callback call is simulated repeatedly.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20231121020701.26440-10-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c b/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c index fa9429f77a8176..598c1e984b267f 100644 --- a/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c +++ b/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c @@ -25,6 +25,7 @@ struct buf_context { struct num_context { __u64 i; + __u64 j; }; __u8 choice_arr[2] = { 0, 1 }; @@ -69,6 +70,25 @@ int unsafe_on_zero_iter(void *unused) return choice_arr[loop_ctx.i]; } +static int widening_cb(__u32 idx, struct num_context *ctx) +{ + ++ctx->i; + return 0; +} + +SEC("?raw_tp") +__success +int widening(void *unused) +{ + struct num_context loop_ctx = { .i = 0, .j = 1 }; + + bpf_loop(100, widening_cb, &loop_ctx, 0); + /* loop_ctx.j is not changed during callback iteration, + * verifier should not apply widening to it. + */ + return choice_arr[loop_ctx.j]; +} + static int loop_detection_cb(__u32 idx, struct num_context *ctx) { for (;;) {} |