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selftests/bpf: Test linking with duplicate extern functions

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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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241002-libbpf-dup-extern-funcs-v4-2-560eb460ff90@hack3r.moe
This commit is contained in:
Eric Long 2024-10-02 14:25:07 +08:00 committed by Andrii Nakryiko
parent 4b146e95da
commit 3c591de285
2 changed files with 16 additions and 0 deletions
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8
tools/testing/selftests/bpf/progs/linked_funcs1.c
View File

@ -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";

8
tools/testing/selftests/bpf/progs/linked_funcs2.c
View File

@ -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";