linux-kernel - Re: [PATCH] selftests/bpf: Add test for trie_get_next

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Message-ID: <ZxrJnZ4+hmZ90Mbj@localhost.localdomain>
Date: Fri, 25 Oct 2024 07:26:37 +0900
From: Byeonguk Jeong <jungbu2855@...il.com>
To: Daniel Borkmann <daniel@...earbox.net>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Yonghong Song <yonghong.song@...ux.dev>, bpf <bpf@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/bpf: Add test for trie_get_next_key()

Hi Daniel,

Okay, I will submit them in a series of patches. Btw, ASSERT_* macros
are not defined for map_tests. Should I add the definitions for them,
or just go with CHECK?

Thanks,
Byeonguk

On Thu, Oct 24, 2024 at 11:41:19AM +0200, Daniel Borkmann wrote:
> Hi Byeonguk,
> 
> On 10/24/24 11:08 AM, Byeonguk Jeong wrote:
> > Add a test for out-of-bounds write in trie_get_next_key() when a full
> > path from root to leaf exists and bpf_map_get_next_key() is called
> > with the leaf node. It may crashes the kernel on failure, so please
> > run in a VM.
> > 
> > Signed-off-by: Byeonguk Jeong <jungbu2855@...il.com>
> 
> Could you submit the fix + this selftest as a 2-patch series, otherwise BPF CI
> cannot test both in combination (pls make sure subject has [PATCH bpf] so that
> our CI adds this on top of the bpf tree).
> 
> Right now the CI selftest build threw an error:
> 
>   /tmp/work/bpf/bpf/tools/testing/selftests/bpf/map_tests/lpm_trie_map_get_next_key.c: In function ‘test_lpm_trie_map_get_next_key’:
>   /tmp/work/bpf/bpf/tools/testing/selftests/bpf/map_tests/lpm_trie_map_get_next_key.c:84:9: error: format not a string literal and no format arguments [-Werror=format-security]
>      84 |         CHECK(map_fd == -1, "bpf_map_create(), error:%s\n",
>         |         ^~~~~
>     TEST-OBJ [test_maps] task_storage_map.test.o
>     TEST-OBJ [test_progs] access_variable_array.test.o
>   cc1: all warnings being treated as errors
>     TEST-OBJ [test_progs] align.test.o
>     TEST-OBJ [test_progs] arena_atomics.test.o
>   make: *** [Makefile:765: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/lpm_trie_map_get_next_key.test.o] Error 1
>   make: *** Waiting for unfinished jobs....
>     GEN-SKEL [test_progs-no_alu32] test_usdt.skel.h
>   make: Leaving directory '/tmp/work/bpf/bpf/tools/testing/selftests/bpf'
> 
> Also on quick glance, please use ASSERT_*() macros instead of CHECK() as the
> latter is deprecated.
> 
> Thanks,
> Daniel