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bpf: consider CONST_PTR_TO_MAP as trusted pointer to struct bpf_map

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Add the BTF id of struct bpf_map to the reg2btf_ids array. This makes the
values of the CONST_PTR_TO_MAP type to be considered as trusted by kfuncs.
This, in turn, allows users to execute trusted kfuncs which accept `struct
bpf_map *` arguments from non-tracing programs.

While exporting the btf_bpf_map_id variable, save some bytes by defining
it as BTF_ID_LIST_GLOBAL_SINGLE (which is u32[1]) and not as BTF_ID_LIST
(which is u32[64]).

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Link: https://lore.kernel.org/r/20230719092952.41202-3-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Anton Protopopov 2023-07-19 09:29:50 +00:00 committed by Alexei Starovoitov
parent 831deb2976
commit 5ba190c29c
3 changed files with 3 additions and 2 deletions
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1
include/linux/btf_ids.h
View File

@ -267,5 +267,6 @@ MAX_BTF_TRACING_TYPE,
extern u32 btf_tracing_ids[];
extern u32 bpf_cgroup_btf_id[];
extern u32 bpf_local_storage_map_btf_id[];
extern u32 btf_bpf_map_id[];
#endif

3
kernel/bpf/map_iter.c
View File

@ -78,8 +78,7 @@ static const struct seq_operations bpf_map_seq_ops = {
.show = bpf_map_seq_show,
};
BTF_ID_LIST(btf_bpf_map_id)
BTF_ID(struct, bpf_map)
BTF_ID_LIST_GLOBAL_SINGLE(btf_bpf_map_id, struct, bpf_map)
static const struct bpf_iter_seq_info bpf_map_seq_info = {
.seq_ops = &bpf_map_seq_ops,

1
kernel/bpf/verifier.c
View File

@ -5419,6 +5419,7 @@ static u32 *reg2btf_ids[__BPF_REG_TYPE_MAX] = {
[PTR_TO_SOCK_COMMON] = &btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON],
[PTR_TO_TCP_SOCK] = &btf_sock_ids[BTF_SOCK_TYPE_TCP],
#endif
[CONST_PTR_TO_MAP] = btf_bpf_map_id,
};
static bool is_trusted_reg(const struct bpf_reg_state *reg)