diff options
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/btf.c | 18 | ||||
| -rw-r--r-- | tools/lib/bpf/btf_dump.c | 3 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 36 |
3 files changed, 46 insertions, 11 deletions
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c index 27e7bfae953b..b770702dab37 100644 --- a/tools/lib/bpf/btf.c +++ b/tools/lib/bpf/btf.c @@ -995,7 +995,7 @@ static struct btf *btf_new_empty(struct btf *base_btf) if (base_btf) { btf->base_btf = base_btf; btf->start_id = btf__type_cnt(base_btf); - btf->start_str_off = base_btf->hdr->str_len; + btf->start_str_off = base_btf->hdr->str_len + base_btf->start_str_off; btf->swapped_endian = base_btf->swapped_endian; } @@ -4176,6 +4176,19 @@ static bool btf_dedup_identical_structs(struct btf_dedup *d, __u32 id1, __u32 id return true; } +static bool btf_dedup_identical_ptrs(struct btf_dedup *d, __u32 id1, __u32 id2) +{ + struct btf_type *t1, *t2; + + t1 = btf_type_by_id(d->btf, id1); + t2 = btf_type_by_id(d->btf, id2); + + if (!btf_is_ptr(t1) || !btf_is_ptr(t2)) + return false; + + return t1->type == t2->type; +} + /* * Check equivalence of BTF type graph formed by candidate struct/union (we'll * call it "candidate graph" in this description for brevity) to a type graph @@ -4308,6 +4321,9 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id, */ if (btf_dedup_identical_structs(d, hypot_type_id, cand_id)) return 1; + /* A similar case is again observed for PTRs. */ + if (btf_dedup_identical_ptrs(d, hypot_type_id, cand_id)) + return 1; return 0; } diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 46cce18c8308..12306b5de3ef 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -225,6 +225,9 @@ static void btf_dump_free_names(struct hashmap *map) size_t bkt; struct hashmap_entry *cur; + if (!map) + return; + hashmap__for_each_entry(map, cur, bkt) free((void *)cur->pkey); diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index bb24f6bac207..747cef47e685 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -596,7 +596,7 @@ struct extern_desc { int sym_idx; int btf_id; int sec_btf_id; - const char *name; + char *name; char *essent_name; bool is_set; bool is_weak; @@ -726,7 +726,7 @@ struct bpf_object { struct usdt_manager *usdt_man; - struct bpf_map *arena_map; + int arena_map_idx; void *arena_data; size_t arena_data_sz; @@ -1494,6 +1494,7 @@ static struct bpf_object *bpf_object__new(const char *path, obj->efile.obj_buf_sz = obj_buf_sz; obj->efile.btf_maps_shndx = -1; obj->kconfig_map_idx = -1; + obj->arena_map_idx = -1; obj->kern_version = get_kernel_version(); obj->loaded = false; @@ -2935,7 +2936,7 @@ static int init_arena_map_data(struct bpf_object *obj, struct bpf_map *map, const long page_sz = sysconf(_SC_PAGE_SIZE); size_t mmap_sz; - mmap_sz = bpf_map_mmap_sz(obj->arena_map); + mmap_sz = bpf_map_mmap_sz(map); if (roundup(data_sz, page_sz) > mmap_sz) { pr_warn("elf: sec '%s': declared ARENA map size (%zu) is too small to hold global __arena variables of size %zu\n", sec_name, mmap_sz, data_sz); @@ -3009,12 +3010,12 @@ static int bpf_object__init_user_btf_maps(struct bpf_object *obj, bool strict, if (map->def.type != BPF_MAP_TYPE_ARENA) continue; - if (obj->arena_map) { + if (obj->arena_map_idx >= 0) { pr_warn("map '%s': only single ARENA map is supported (map '%s' is also ARENA)\n", - map->name, obj->arena_map->name); + map->name, obj->maps[obj->arena_map_idx].name); return -EINVAL; } - obj->arena_map = map; + obj->arena_map_idx = i; if (obj->efile.arena_data) { err = init_arena_map_data(obj, map, ARENA_SEC, obj->efile.arena_data_shndx, @@ -3024,7 +3025,7 @@ static int bpf_object__init_user_btf_maps(struct bpf_object *obj, bool strict, return err; } } - if (obj->efile.arena_data && !obj->arena_map) { + if (obj->efile.arena_data && obj->arena_map_idx < 0) { pr_warn("elf: sec '%s': to use global __arena variables the ARENA map should be explicitly declared in SEC(\".maps\")\n", ARENA_SEC); return -ENOENT; @@ -4223,7 +4224,9 @@ static int bpf_object__collect_externs(struct bpf_object *obj) return ext->btf_id; } t = btf__type_by_id(obj->btf, ext->btf_id); - ext->name = btf__name_by_offset(obj->btf, t->name_off); + ext->name = strdup(btf__name_by_offset(obj->btf, t->name_off)); + if (!ext->name) + return -ENOMEM; ext->sym_idx = i; ext->is_weak = ELF64_ST_BIND(sym->st_info) == STB_WEAK; @@ -4545,8 +4548,13 @@ static int bpf_program__record_reloc(struct bpf_program *prog, if (shdr_idx == obj->efile.arena_data_shndx) { reloc_desc->type = RELO_DATA; reloc_desc->insn_idx = insn_idx; - reloc_desc->map_idx = obj->arena_map - obj->maps; + reloc_desc->map_idx = obj->arena_map_idx; reloc_desc->sym_off = sym->st_value; + + map = &obj->maps[obj->arena_map_idx]; + pr_debug("prog '%s': found arena map %d (%s, sec %d, off %zu) for insn %u\n", + prog->name, obj->arena_map_idx, map->name, map->sec_idx, + map->sec_offset, insn_idx); return 0; } @@ -9062,8 +9070,10 @@ void bpf_object__close(struct bpf_object *obj) zfree(&obj->btf_custom_path); zfree(&obj->kconfig); - for (i = 0; i < obj->nr_extern; i++) + for (i = 0; i < obj->nr_extern; i++) { + zfree(&obj->externs[i].name); zfree(&obj->externs[i].essent_name); + } zfree(&obj->externs); obj->nr_extern = 0; @@ -13971,6 +13981,12 @@ int bpf_object__attach_skeleton(struct bpf_object_skeleton *s) } link = map_skel->link; + if (!link) { + pr_warn("map '%s': BPF map skeleton link is uninitialized\n", + bpf_map__name(map)); + continue; + } + if (*link) continue; |