6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andrii Nakryiko <andrii@xxxxxxxxxx>
[ Upstream commit 189f1a976e426011e6a5588f1d3ceedf71fe2965 ]
For all these years libbpf's BTF dumper has been emitting not strictly
valid syntax for function prototypes that have no input arguments.
Instead of `int (*blah)()` we should emit `int (*blah)(void)`.
This is not normally a problem, but it manifests when we get kfuncs in
vmlinux.h that have no input arguments. Due to compiler internal
specifics, we get no BTF information for such kfuncs, if they are not
declared with proper `(void)`.
The fix is trivial. We also need to adjust a few ancient tests that
happily assumed `()` is correct.
Fixes: 351131b51c7a ("libbpf: add btf_dump API for BTF-to-C conversion")
Reported-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Stanislav Fomichev <sdf@xxxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240712224442.282823-1-andrii@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/lib/bpf/btf_dump.c | 8 +++++---
.../selftests/bpf/progs/btf_dump_test_case_multidim.c | 4 ++--
.../selftests/bpf/progs/btf_dump_test_case_syntax.c | 4 ++--
3 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index 4d9f30bf7f014..ebf56d21d08ee 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -1559,10 +1559,12 @@ static void btf_dump_emit_type_chain(struct btf_dump *d,
* Clang for BPF target generates func_proto with no
* args as a func_proto with a single void arg (e.g.,
* `int (*f)(void)` vs just `int (*f)()`). We are
- * going to pretend there are no args for such case.
+ * going to emit valid empty args (void) syntax for
+ * such case. Similarly and conveniently, valid
+ * no args case can be special-cased here as well.
*/
- if (vlen == 1 && p->type == 0) {
- btf_dump_printf(d, ")");
+ if (vlen == 0 || (vlen == 1 && p->type == 0)) {
+ btf_dump_printf(d, "void)");
return;
}
diff --git a/tools/testing/selftests/bpf/progs/btf_dump_test_case_multidim.c b/tools/testing/selftests/bpf/progs/btf_dump_test_case_multidim.c
index ba97165bdb282..a657651eba523 100644
--- a/tools/testing/selftests/bpf/progs/btf_dump_test_case_multidim.c
+++ b/tools/testing/selftests/bpf/progs/btf_dump_test_case_multidim.c
@@ -14,9 +14,9 @@ typedef int *ptr_arr_t[6];
typedef int *ptr_multiarr_t[7][8][9][10];
-typedef int * (*fn_ptr_arr_t[11])();
+typedef int * (*fn_ptr_arr_t[11])(void);
-typedef int * (*fn_ptr_multiarr_t[12][13])();
+typedef int * (*fn_ptr_multiarr_t[12][13])(void);
struct root_struct {
arr_t _1;
diff --git a/tools/testing/selftests/bpf/progs/btf_dump_test_case_syntax.c b/tools/testing/selftests/bpf/progs/btf_dump_test_case_syntax.c
index ad21ee8c7e234..29d01fff32bd2 100644
--- a/tools/testing/selftests/bpf/progs/btf_dump_test_case_syntax.c
+++ b/tools/testing/selftests/bpf/progs/btf_dump_test_case_syntax.c
@@ -100,7 +100,7 @@ typedef void (*printf_fn_t)(const char *, ...);
* `int -> char *` function and returns pointer to a char. Equivalent:
* typedef char * (*fn_input_t)(int);
* typedef char * (*fn_output_outer_t)(fn_input_t);
- * typedef const fn_output_outer_t (* fn_output_inner_t)();
+ * typedef const fn_output_outer_t (* fn_output_inner_t)(void);
* typedef const fn_output_inner_t fn_ptr_arr2_t[5];
*/
/* ----- START-EXPECTED-OUTPUT ----- */
@@ -127,7 +127,7 @@ typedef void (* (*signal_t)(int, void (*)(int)))(int);
typedef char * (*fn_ptr_arr1_t[10])(int **);
-typedef char * (* (* const fn_ptr_arr2_t[5])())(char * (*)(int));
+typedef char * (* (* const fn_ptr_arr2_t[5])(void))(char * (*)(int));
struct struct_w_typedefs {
int_t a;
--
2.43.0
