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-rw-r--r--tools/lib/bpf/libbpf.c104
1 files changed, 73 insertions, 31 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 50d41815f431..3ad139285fad 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -223,13 +223,18 @@ __printf(2, 3)
void libbpf_print(enum libbpf_print_level level, const char *format, ...)
{
va_list args;
+ int old_errno;
if (!__libbpf_pr)
return;
+ old_errno = errno;
+
va_start(args, format);
__libbpf_pr(level, format, args);
va_end(args);
+
+ errno = old_errno;
}
static void pr_perm_msg(int err)
@@ -412,6 +417,7 @@ struct bpf_program {
int fd;
bool autoload;
+ bool autoattach;
bool mark_btf_static;
enum bpf_prog_type type;
enum bpf_attach_type expected_attach_type;
@@ -591,7 +597,6 @@ struct elf_state {
size_t strtabidx;
struct elf_sec_desc *secs;
int sec_cnt;
- int maps_shndx;
int btf_maps_shndx;
__u32 btf_maps_sec_btf_id;
int text_shndx;
@@ -751,6 +756,8 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog,
prog->autoload = true;
}
+ prog->autoattach = true;
+
/* inherit object's log_level */
prog->log_level = obj->log_level;
@@ -1272,7 +1279,6 @@ static struct bpf_object *bpf_object__new(const char *path,
*/
obj->efile.obj_buf = obj_buf;
obj->efile.obj_buf_sz = obj_buf_sz;
- obj->efile.maps_shndx = -1;
obj->efile.btf_maps_shndx = -1;
obj->efile.st_ops_shndx = -1;
obj->kconfig_map_idx = -1;
@@ -1642,6 +1648,10 @@ static int bpf_object__init_global_data_maps(struct bpf_object *obj)
for (sec_idx = 1; sec_idx < obj->efile.sec_cnt; sec_idx++) {
sec_desc = &obj->efile.secs[sec_idx];
+ /* Skip recognized sections with size 0. */
+ if (!sec_desc->data || sec_desc->data->d_size == 0)
+ continue;
+
switch (sec_desc->sec_type) {
case SEC_DATA:
sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx));
@@ -3359,7 +3369,8 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (err)
return err;
} else if (strcmp(name, "maps") == 0) {
- obj->efile.maps_shndx = idx;
+ pr_warn("elf: legacy map definitions in 'maps' section are not supported by libbpf v1.0+\n");
+ return -ENOTSUP;
} else if (strcmp(name, MAPS_ELF_SEC) == 0) {
obj->efile.btf_maps_shndx = idx;
} else if (strcmp(name, BTF_ELF_SEC) == 0) {
@@ -3891,8 +3902,7 @@ static bool bpf_object__shndx_is_data(const struct bpf_object *obj,
static bool bpf_object__shndx_is_maps(const struct bpf_object *obj,
int shndx)
{
- return shndx == obj->efile.maps_shndx ||
- shndx == obj->efile.btf_maps_shndx;
+ return shndx == obj->efile.btf_maps_shndx;
}
static enum libbpf_map_type
@@ -4277,11 +4287,12 @@ int bpf_map__set_autocreate(struct bpf_map *map, bool autocreate)
int bpf_map__reuse_fd(struct bpf_map *map, int fd)
{
- struct bpf_map_info info = {};
+ struct bpf_map_info info;
__u32 len = sizeof(info), name_len;
int new_fd, err;
char *new_name;
+ memset(&info, 0, len);
err = bpf_obj_get_info_by_fd(fd, &info, &len);
if (err && errno == EINVAL)
err = bpf_get_map_info_from_fdinfo(fd, &info);
@@ -4408,14 +4419,23 @@ static int probe_fd(int fd)
static int probe_kern_prog_name(void)
{
+ const size_t attr_sz = offsetofend(union bpf_attr, prog_name);
struct bpf_insn insns[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
- int ret, insn_cnt = ARRAY_SIZE(insns);
+ union bpf_attr attr;
+ int ret;
+
+ memset(&attr, 0, attr_sz);
+ attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
+ attr.license = ptr_to_u64("GPL");
+ attr.insns = ptr_to_u64(insns);
+ attr.insn_cnt = (__u32)ARRAY_SIZE(insns);
+ libbpf_strlcpy(attr.prog_name, "libbpf_nametest", sizeof(attr.prog_name));
/* make sure loading with name works */
- ret = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, "test", "GPL", insns, insn_cnt, NULL);
+ ret = sys_bpf_prog_load(&attr, attr_sz, PROG_LOAD_ATTEMPTS);
return probe_fd(ret);
}
@@ -4430,7 +4450,7 @@ static int probe_kern_global_data(void)
};
int ret, map, insn_cnt = ARRAY_SIZE(insns);
- map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int), 32, 1, NULL);
+ map = bpf_map_create(BPF_MAP_TYPE_ARRAY, "libbpf_global", sizeof(int), 32, 1, NULL);
if (map < 0) {
ret = -errno;
cp = libbpf_strerror_r(ret, errmsg, sizeof(errmsg));
@@ -4563,7 +4583,7 @@ static int probe_kern_array_mmap(void)
LIBBPF_OPTS(bpf_map_create_opts, opts, .map_flags = BPF_F_MMAPABLE);
int fd;
- fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int), sizeof(int), 1, &opts);
+ fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "libbpf_mmap", sizeof(int), sizeof(int), 1, &opts);
return probe_fd(fd);
}
@@ -4610,7 +4630,7 @@ static int probe_prog_bind_map(void)
};
int ret, map, prog, insn_cnt = ARRAY_SIZE(insns);
- map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int), 32, 1, NULL);
+ map = bpf_map_create(BPF_MAP_TYPE_ARRAY, "libbpf_det_bind", sizeof(int), 32, 1, NULL);
if (map < 0) {
ret = -errno;
cp = libbpf_strerror_r(ret, errmsg, sizeof(errmsg));
@@ -4814,13 +4834,12 @@ bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id)
static bool map_is_reuse_compat(const struct bpf_map *map, int map_fd)
{
- struct bpf_map_info map_info = {};
+ struct bpf_map_info map_info;
char msg[STRERR_BUFSIZE];
- __u32 map_info_len;
+ __u32 map_info_len = sizeof(map_info);
int err;
- map_info_len = sizeof(map_info);
-
+ memset(&map_info, 0, map_info_len);
err = bpf_obj_get_info_by_fd(map_fd, &map_info, &map_info_len);
if (err && errno == EINVAL)
err = bpf_get_map_info_from_fdinfo(map_fd, &map_info);
@@ -7244,8 +7263,6 @@ static int bpf_object_unload(struct bpf_object *obj)
return 0;
}
-int bpf_object__unload(struct bpf_object *obj) __attribute__((alias("bpf_object_unload")));
-
static int bpf_object__sanitize_maps(struct bpf_object *obj)
{
struct bpf_map *m;
@@ -8298,6 +8315,16 @@ int bpf_program__set_autoload(struct bpf_program *prog, bool autoload)
return 0;
}
+bool bpf_program__autoattach(const struct bpf_program *prog)
+{
+ return prog->autoattach;
+}
+
+void bpf_program__set_autoattach(struct bpf_program *prog, bool autoattach)
+{
+ prog->autoattach = autoattach;
+}
+
const struct bpf_insn *bpf_program__insns(const struct bpf_program *prog)
{
return prog->insns;
@@ -8978,11 +9005,12 @@ int libbpf_find_vmlinux_btf_id(const char *name,
static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
{
- struct bpf_prog_info info = {};
+ struct bpf_prog_info info;
__u32 info_len = sizeof(info);
struct btf *btf;
int err;
+ memset(&info, 0, info_len);
err = bpf_obj_get_info_by_fd(attach_prog_fd, &info, &info_len);
if (err) {
pr_warn("failed bpf_obj_get_info_by_fd for FD %d: %d\n",
@@ -9810,13 +9838,16 @@ static int determine_uprobe_retprobe_bit(void)
static int perf_event_open_probe(bool uprobe, bool retprobe, const char *name,
uint64_t offset, int pid, size_t ref_ctr_off)
{
- struct perf_event_attr attr = {};
+ const size_t attr_sz = sizeof(struct perf_event_attr);
+ struct perf_event_attr attr;
char errmsg[STRERR_BUFSIZE];
int type, pfd;
if (ref_ctr_off >= (1ULL << PERF_UPROBE_REF_CTR_OFFSET_BITS))
return -EINVAL;
+ memset(&attr, 0, attr_sz);
+
type = uprobe ? determine_uprobe_perf_type()
: determine_kprobe_perf_type();
if (type < 0) {
@@ -9837,7 +9868,7 @@ static int perf_event_open_probe(bool uprobe, bool retprobe, const char *name,
}
attr.config |= 1 << bit;
}
- attr.size = sizeof(attr);
+ attr.size = attr_sz;
attr.type = type;
attr.config |= (__u64)ref_ctr_off << PERF_UPROBE_REF_CTR_OFFSET_SHIFT;
attr.config1 = ptr_to_u64(name); /* kprobe_func or uprobe_path */
@@ -9936,7 +9967,8 @@ static int determine_kprobe_perf_type_legacy(const char *probe_name, bool retpro
static int perf_event_kprobe_open_legacy(const char *probe_name, bool retprobe,
const char *kfunc_name, size_t offset, int pid)
{
- struct perf_event_attr attr = {};
+ const size_t attr_sz = sizeof(struct perf_event_attr);
+ struct perf_event_attr attr;
char errmsg[STRERR_BUFSIZE];
int type, pfd, err;
@@ -9955,7 +9987,9 @@ static int perf_event_kprobe_open_legacy(const char *probe_name, bool retprobe,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
goto err_clean_legacy;
}
- attr.size = sizeof(attr);
+
+ memset(&attr, 0, attr_sz);
+ attr.size = attr_sz;
attr.config = type;
attr.type = PERF_TYPE_TRACEPOINT;
@@ -10412,6 +10446,7 @@ static int determine_uprobe_perf_type_legacy(const char *probe_name, bool retpro
static int perf_event_uprobe_open_legacy(const char *probe_name, bool retprobe,
const char *binary_path, size_t offset, int pid)
{
+ const size_t attr_sz = sizeof(struct perf_event_attr);
struct perf_event_attr attr;
int type, pfd, err;
@@ -10429,8 +10464,8 @@ static int perf_event_uprobe_open_legacy(const char *probe_name, bool retprobe,
goto err_clean_legacy;
}
- memset(&attr, 0, sizeof(attr));
- attr.size = sizeof(attr);
+ memset(&attr, 0, attr_sz);
+ attr.size = attr_sz;
attr.config = type;
attr.type = PERF_TYPE_TRACEPOINT;
@@ -10662,15 +10697,17 @@ static const char *arch_specific_lib_paths(void)
static int resolve_full_path(const char *file, char *result, size_t result_sz)
{
const char *search_paths[3] = {};
- int i;
+ int i, perm;
if (str_has_sfx(file, ".so") || strstr(file, ".so.")) {
search_paths[0] = getenv("LD_LIBRARY_PATH");
search_paths[1] = "/usr/lib64:/usr/lib";
search_paths[2] = arch_specific_lib_paths();
+ perm = R_OK;
} else {
search_paths[0] = getenv("PATH");
search_paths[1] = "/usr/bin:/usr/sbin";
+ perm = R_OK | X_OK;
}
for (i = 0; i < ARRAY_SIZE(search_paths); i++) {
@@ -10689,8 +10726,8 @@ static int resolve_full_path(const char *file, char *result, size_t result_sz)
if (!seg_len)
continue;
snprintf(result, result_sz, "%.*s/%s", seg_len, s, file);
- /* ensure it is an executable file/link */
- if (access(result, R_OK | X_OK) < 0)
+ /* ensure it has required permissions */
+ if (access(result, perm) < 0)
continue;
pr_debug("resolved '%s' to '%s'\n", file, result);
return 0;
@@ -10967,7 +11004,8 @@ static int determine_tracepoint_id(const char *tp_category,
static int perf_event_open_tracepoint(const char *tp_category,
const char *tp_name)
{
- struct perf_event_attr attr = {};
+ const size_t attr_sz = sizeof(struct perf_event_attr);
+ struct perf_event_attr attr;
char errmsg[STRERR_BUFSIZE];
int tp_id, pfd, err;
@@ -10979,8 +11017,9 @@ static int perf_event_open_tracepoint(const char *tp_category,
return tp_id;
}
+ memset(&attr, 0, attr_sz);
attr.type = PERF_TYPE_TRACEPOINT;
- attr.size = sizeof(attr);
+ attr.size = attr_sz;
attr.config = tp_id;
pfd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu */,
@@ -11600,12 +11639,15 @@ struct perf_buffer *perf_buffer__new(int map_fd, size_t page_cnt,
void *ctx,
const struct perf_buffer_opts *opts)
{
+ const size_t attr_sz = sizeof(struct perf_event_attr);
struct perf_buffer_params p = {};
- struct perf_event_attr attr = {};
+ struct perf_event_attr attr;
if (!OPTS_VALID(opts, perf_buffer_opts))
return libbpf_err_ptr(-EINVAL);
+ memset(&attr, 0, attr_sz);
+ attr.size = attr_sz;
attr.config = PERF_COUNT_SW_BPF_OUTPUT;
attr.type = PERF_TYPE_SOFTWARE;
attr.sample_type = PERF_SAMPLE_RAW;
@@ -12328,7 +12370,7 @@ int bpf_object__attach_skeleton(struct bpf_object_skeleton *s)
struct bpf_program *prog = *s->progs[i].prog;
struct bpf_link **link = s->progs[i].link;
- if (!prog->autoload)
+ if (!prog->autoload || !prog->autoattach)
continue;
/* auto-attaching not supported for this program */
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-07 02:52:15 +0000