[PATCH 6.8 103/715] libbpf: fix __arg_ctx type enforcement for perf_event programs

Sasha Levin
2024-03-24T22:36:42Z

From: Andrii Nakryiko <andrii@kernel.org>

[ Upstream commit 9eea8fafe33eb70868f6ace2fc1e17c4ff5539c3 ]

Adjust PERF_EVENT type enforcement around __arg_ctx to match exactly
what kernel is doing.

Fixes: 76ec90a996e3 ("libbpf: warn on unexpected __arg_ctx type when rewriting BTF")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240125205510.3642094-3-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/lib/bpf/libbpf.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index b8b00da629071..910f72c9e6a49 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -33,6 +33,7 @@
#include <linux/filter.h>
#include <linux/limits.h>
#include <linux/perf_event.h>
+#include <linux/bpf_perf_event.h>
#include <linux/ring_buffer.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
@@ -6699,6 +6700,14 @@ static struct {
/* all other program types don't have "named" context structs */
};

+/* forward declarations for arch-specific underlying types of bpf_user_pt_regs_t typedef,
+ * for below __builtin_types_compatible_p() checks;
+ * with this approach we don't need any extra arch-specific #ifdef guards
+ */
+struct pt_regs;
+struct user_pt_regs;
+struct user_regs_struct;
+
static bool need_func_arg_type_fixup(const struct btf *btf, const struct bpf_program *prog,
const char *subprog_name, int arg_idx,
int arg_type_id, const char *ctx_name)
@@ -6739,11 +6748,21 @@ static bool need_func_arg_type_fixup(const struct btf *btf, const struct bpf_pro
/* special cases */
switch (prog->type) {
case BPF_PROG_TYPE_KPROBE:
- case BPF_PROG_TYPE_PERF_EVENT:
/* `struct pt_regs *` is expected, but we need to fix up */
if (btf_is_struct(t) && strcmp(tname, "pt_regs") == 0)
return true;
break;
+ case BPF_PROG_TYPE_PERF_EVENT:
+ if (__builtin_types_compatible_p(bpf_user_pt_regs_t, struct pt_regs) &&
+ btf_is_struct(t) && strcmp(tname, "pt_regs") == 0)
+ return 0;
+ if (__builtin_types_compatible_p(bpf_user_pt_regs_t, struct user_pt_regs) &&
+ btf_is_struct(t) && strcmp(tname, "user_pt_regs") == 0)
+ return 0;
+ if (__builtin_types_compatible_p(bpf_user_pt_regs_t, struct user_regs_struct) &&
+ btf_is_struct(t) && strcmp(tname, "user_regs_struct") == 0)
+ return 0;
+ break;
case BPF_PROG_TYPE_RAW_TRACEPOINT:
case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
/* allow u64* as ctx */
--
2.43.0