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| author | Martin KaFai Lau <kafai@fb.com> | 2017-09-27 14:37:53 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-29 06:17:05 +0100 |
| commit | ad5b177bd73f5107d97c36f56395c4281fb6f089 (patch) | |
| tree | 90f03bf2a9ce3370d0979524a10784bce7714042 /kernel/bpf/syscall.c | |
| parent | cb4d2b3f03d8eed90be3a194e5b54b734ec4bbe9 (diff) | |
| download | lwn-ad5b177bd73f5107d97c36f56395c4281fb6f089.tar.gz lwn-ad5b177bd73f5107d97c36f56395c4281fb6f089.zip | |
bpf: Add map_name to bpf_map_info
This patch allows userspace to specify a name for a map
during BPF_MAP_CREATE.
The map's name can later be exported to user space
via BPF_OBJ_GET_INFO_BY_FD.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 45970df3f820..11a7f82a55d1 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -339,7 +339,7 @@ static int bpf_obj_name_cpy(char *dst, const char *src) return 0; } -#define BPF_MAP_CREATE_LAST_FIELD numa_node +#define BPF_MAP_CREATE_LAST_FIELD map_name /* called via syscall */ static int map_create(union bpf_attr *attr) { @@ -361,6 +361,10 @@ static int map_create(union bpf_attr *attr) if (IS_ERR(map)) return PTR_ERR(map); + err = bpf_obj_name_cpy(map->name, attr->map_name); + if (err) + goto free_map_nouncharge; + atomic_set(&map->refcnt, 1); atomic_set(&map->usercnt, 1); @@ -1462,6 +1466,7 @@ static int bpf_map_get_info_by_fd(struct bpf_map *map, info.value_size = map->value_size; info.max_entries = map->max_entries; info.map_flags = map->map_flags; + memcpy(info.name, map->name, sizeof(map->name)); if (copy_to_user(uinfo, &info, info_len) || put_user(info_len, &uattr->info.info_len)) |