linux-kernel - [PATCH] bpf: extend btf id list

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Date:   Tue,  7 Mar 2023 10:12:39 -0500
From:   Tom Rix <trix@...hat.com>
To:     martin.lau@...ux.dev, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, joannelkoong@...il.com
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] bpf: extend btf id list

With clang and W=1, there is this error

kernel/bpf/verifier.c:10298:24: error: array index 16 is past
 the end of the array (that has type 'u32[16]'
 (aka 'unsigned int[16]')) [-Werror,-Warray-bounds]
    meta.func_id == special_kfunc_list[KF_bpf_dynptr_slice_rdwr]) {
                    ^                  ~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/verifier.c:9150:1: note: array 'special_kfunc_list' declared here
BTF_ID_LIST(special_kfunc_list)
^
./include/linux/btf_ids.h:207:27: note: expanded from macro 'BTF_ID_LIST'
 #define BTF_ID_LIST(name) static u32 __maybe_unused name[16];

When KF_bpf_dynptr_slice_rdwr was added to the enum special_kfunc_type
the total exceeded 16.  Increase the array size to 32.

Fixes: 66e3a13e7c2c ("bpf: Add bpf_dynptr_slice and bpf_dynptr_slice_rdwr")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 include/linux/btf_ids.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index 3a4f7cd882ca..166c387b48f7 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -204,7 +204,7 @@ extern struct btf_id_set8 name;
 
 #else
 
-#define BTF_ID_LIST(name) static u32 __maybe_unused name[16];
+#define BTF_ID_LIST(name) static u32 __maybe_unused name[32];
 #define BTF_ID(prefix, name)
 #define BTF_ID_FLAGS(prefix, name, ...)
 #define BTF_ID_UNUSED
-- 
2.27.0