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[bpf-next,v4,2/2] selftests/bpf: test linking with duplicate extern functions

Message ID 20241002-libbpf-dup-extern-funcs-v4-2-560eb460ff90@hack3r.moe (mailing list archive)
State New
Delegated to: BPF
Headers show
Series BPF static linker: fix linking duplicate extern functions | expand

Checks

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bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/build_tools success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 14 maintainers not CCed: mykolal@fb.com sdf@fomichev.me eddyz87@gmail.com haoluo@google.com shuah@kernel.org jolsa@kernel.org daniel@iogearbox.net linux-kselftest@vger.kernel.org memxor@gmail.com song@kernel.org yonghong.song@linux.dev kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com
netdev/build_clang success Errors and warnings before: 7 this patch: 7
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 7 this patch: 7
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 36 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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Commit Message

Eric Long via B4 Relay Oct. 2, 2024, 6:25 a.m. UTC 
From: Eric Long <i@hack3r.moe>

Previously when multiple BPF object files referencing the same extern
function (usually kfunc) are statically linked using `bpftool gen
object`, libbpf tries to get the nonexistent size of BTF_KIND_FUNC_PROTO
and fails. This test ensures it is fixed.

Signed-off-by: Eric Long <i@hack3r.moe>
---
 tools/testing/selftests/bpf/progs/linked_funcs1.c | 8 ++++++++
 tools/testing/selftests/bpf/progs/linked_funcs2.c | 8 ++++++++
 2 files changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/linked_funcs1.c b/tools/testing/selftests/bpf/progs/linked_funcs1.c
index cc79dddac182c20da69a1a57fa39bc81004184f1..049a1f78de3f835e7658dde6f2d03161b6a5a07f 100644
--- a/tools/testing/selftests/bpf/progs/linked_funcs1.c
+++ b/tools/testing/selftests/bpf/progs/linked_funcs1.c
@@ -63,6 +63,8 @@  extern int set_output_val2(int x);
 /* here we'll force set_output_ctx2() to be __hidden in the final obj file */
 __hidden extern void set_output_ctx2(__u64 *ctx);
 
+void *bpf_cast_to_kern_ctx(void *obj) __ksym;
+
 SEC("?raw_tp/sys_enter")
 int BPF_PROG(handler1, struct pt_regs *regs, long id)
 {
@@ -86,4 +88,10 @@  int BPF_PROG(handler1, struct pt_regs *regs, long id)
 	return 0;
 }
 
+/* Generate BTF FUNC record and test linking with duplicate extern functions */
+void kfunc_gen1(void)
+{
+	bpf_cast_to_kern_ctx(0);
+}
+
 char LICENSE[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/linked_funcs2.c b/tools/testing/selftests/bpf/progs/linked_funcs2.c
index 942cc5526ddf02004bf82d1f72c74cfba6eaf486..96850759fd8d0074249bbf1f743aab08e20de0fc 100644
--- a/tools/testing/selftests/bpf/progs/linked_funcs2.c
+++ b/tools/testing/selftests/bpf/progs/linked_funcs2.c
@@ -63,6 +63,8 @@  extern int set_output_val1(int x);
 /* here we'll force set_output_ctx1() to be __hidden in the final obj file */
 __hidden extern void set_output_ctx1(__u64 *ctx);
 
+void *bpf_cast_to_kern_ctx(void *obj) __ksym;
+
 SEC("?raw_tp/sys_enter")
 int BPF_PROG(handler2, struct pt_regs *regs, long id)
 {
@@ -86,4 +88,10 @@  int BPF_PROG(handler2, struct pt_regs *regs, long id)
 	return 0;
 }
 
+/* Generate BTF FUNC record and test linking with duplicate extern functions */
+void kfunc_gen2(void)
+{
+	bpf_cast_to_kern_ctx(0);
+}
+
 char LICENSE[] SEC("license") = "GPL";