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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: davem@davemloft.net
Cc: daniel@iogearbox.net, andrii@kernel.org, bpf@vger.kernel.org,
	kernel-team@fb.com
Subject: [PATCH v4 bpf-next 06/16] bpf: Adjust BTF log size limit.
Date: Tue, 23 Nov 2021 22:01:59 -0800	[thread overview]
Message-ID: <20211124060209.493-7-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20211124060209.493-1-alexei.starovoitov@gmail.com>

From: Alexei Starovoitov <ast@kernel.org>

Make BTF log size limit to be the same as the verifier log size limit.
Otherwise tools that progressively increase log size and use the same log
for BTF loading and program loading will be hitting hard to debug EINVAL.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
 kernel/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 0d070461e2b8..dbf1f389b1d3 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -4472,7 +4472,7 @@ static struct btf *btf_parse(bpfptr_t btf_data, u32 btf_data_size,
 		log->len_total = log_size;
 
 		/* log attributes have to be sane */
-		if (log->len_total < 128 || log->len_total > UINT_MAX >> 8 ||
+		if (log->len_total < 128 || log->len_total > UINT_MAX >> 2 ||
 		    !log->level || !log->ubuf) {
 			err = -EINVAL;
 			goto errout;
-- 
2.30.2


  parent reply	other threads:[~2021-11-24  6:02 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-24  6:01 [PATCH v4 bpf-next 00/16] bpf: CO-RE support in the kernel Alexei Starovoitov
2021-11-24  6:01 ` [PATCH v4 bpf-next 01/16] libbpf: Replace btf__type_by_id() with btf_type_by_id() Alexei Starovoitov
2021-11-24  6:01 ` [PATCH v4 bpf-next 02/16] bpf: Rename btf_member accessors Alexei Starovoitov
2021-11-24  6:01 ` [PATCH v4 bpf-next 03/16] bpf: Prepare relo_core.c for kernel duty Alexei Starovoitov
2021-11-24  6:01 ` [PATCH v4 bpf-next 04/16] bpf: Define enum bpf_core_relo_kind as uapi Alexei Starovoitov
2021-11-24  6:01 ` [PATCH v4 bpf-next 05/16] bpf: Pass a set of bpf_core_relo-s to prog_load command Alexei Starovoitov
2021-11-24  6:01 ` Alexei Starovoitov [this message]
2021-11-24  6:02 ` [PATCH v4 bpf-next 07/16] bpf: Add bpf_core_add_cands() and wire it into bpf_core_apply_relo_insn() Alexei Starovoitov
2021-11-30  1:03   ` Andrii Nakryiko
2021-11-30  3:18     ` Alexei Starovoitov
2021-11-30  4:09       ` Andrii Nakryiko
2021-11-30  5:04         ` Alexei Starovoitov
2021-11-30  5:14           ` Andrii Nakryiko
2021-11-30 23:06         ` Alexei Starovoitov
2021-11-30 23:12           ` Andrii Nakryiko
2021-11-30  5:50   ` Alexei Starovoitov
2021-11-24  6:02 ` [PATCH v4 bpf-next 08/16] libbpf: Use CO-RE in the kernel in light skeleton Alexei Starovoitov
2021-11-30  1:11   ` Andrii Nakryiko
2021-11-24  6:02 ` [PATCH v4 bpf-next 09/16] libbpf: Support init of inner maps " Alexei Starovoitov
2021-11-24  6:02 ` [PATCH v4 bpf-next 10/16] libbpf: Clean gen_loader's attach kind Alexei Starovoitov
2021-11-30  1:11   ` Andrii Nakryiko
2021-11-24  6:02 ` [PATCH v4 bpf-next 11/16] selftests/bpf: Add lskel version of kfunc test Alexei Starovoitov
2021-11-24  6:02 ` [PATCH v4 bpf-next 12/16] selftests/bpf: Improve inner_map test coverage Alexei Starovoitov
2021-11-24  6:02 ` [PATCH v4 bpf-next 13/16] selftests/bpf: Convert map_ptr_kern test to use light skeleton Alexei Starovoitov
2021-11-24  6:02 ` [PATCH v4 bpf-next 14/16] selftests/bpf: Additional test for CO-RE in the kernel Alexei Starovoitov
2021-11-30  1:13   ` Andrii Nakryiko
2021-11-24  6:02 ` [PATCH v4 bpf-next 15/16] selftests/bpf: Revert CO-RE removal in test_ksyms_weak Alexei Starovoitov
2021-11-24  6:02 ` [PATCH v4 bpf-next 16/16] selftests/bpf: Add CO-RE relocations to verifier scale test Alexei Starovoitov

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