Re: [PATCH bpf-next v2 8/8] selftests/bpf: add tests to validate KASAN on JIT programs

["Alexis Lothoré" <alexis.lothore@bootlin.com>]

On Fri Jun 5, 2026 at 5:47 PM CEST, Yonghong Song wrote:

[...]

> [root@arch-fb-vm1 bpf]# ./test_progs -n 164
> test_kasan:PASS:alloc test ctx 0 nsec
> gzopen /boot/config-7.1.0-rc5-gec86c8156bd6: No such file or directory
> test_kasan:PASS:open prog 0 nsec
> test_kasan:PASS:find rnd_hi32 prog 0 nsec
> ...
> All error logs:
> test_kasan:PASS:alloc test ctx 0 nsec
> gzopen /boot/config-7.1.0-rc5-gec86c8156bd6: No such file or directory
> test_kasan:PASS:open prog 0 nsec
> test_kasan:PASS:find rnd_hi32 prog 0 nsec
> test_kasan:PASS:load prog 0 nsec
> test_kasan:PASS:open kernel logs 0 nsec
> test_kasan:PASS:get map 0 nsec
> test_kasan:PASS:set map 0 nsec
> run_subtest_with_size_and_location:PASS:find test prog 0 nsec
> run_subtest_with_size_and_location:PASS:fetch loaded program info 0 nsec
> run_subtest_with_size_and_location:PASS:run prog 0 nsec
> run_subtest_with_size_and_location:PASS:read kernel logs 0 nsec
> run_subtest_with_size_and_location:FAIL:report should be generated unexpected error: 1 (errno 11)
> #164/1   kasan/st_1_not_on_stack:FAIL

[...]

> #164     kasan:FAIL
>
> I checked the subtest 164/1,
>
> For
>
>          ret = check_kasan_report_in_kernel_logs(klog_buffer, ctx,
>                                                  test->is_write, access_size);
>          if (on_stack || test->expect_no_report)
>                  ASSERT_NEQ(ret, 0, "no report should be generated");
>          else
>                  ASSERT_OK(ret, "report should be generated");
>
> the ret is equal to 1 as klog_buffer is empty. This caused the failure.

Are you seeing any kasan report when you manually check your kernel
logs, or not at all ? If not at all, are you using the "CI" defconfig ?

  cat tools/testing/selftests/bpf/{config,config.vm,config.x86_64} > .config && make olddefconfig

If not, would you mind sharing your defconfig ?

Thanks,

Alexis
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com