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UPSTREAM: bpf: Implement bpf_local_storage for inodes

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Similar to bpf_local_storage for sockets, add local storage for inodes.
The life-cycle of storage is managed with the life-cycle of the inode.
i.e. the storage is destroyed along with the owning inode.

The BPF LSM allocates an __rcu pointer to the bpf_local_storage in the
security blob which are now stackable and can co-exist with other LSMs.

Change-Id: Icdd652ec10897ef218406d76bfadbe321f7d6288
Signed-off-by: KP Singh <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
KP Singh 2020-08-25 20:29:17 +02:00 • committed by basamaryan
commit 9657942f30
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13 changed files with 410 additions and 8 deletions
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5
tools/lib/bpf/libbpf_probes.c
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@ -164,7 +164,7 @@ int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
return btf_fd;
}
static int load_sk_storage_btf(void)
static int load_local_storage_btf(void)
{
const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
/* struct bpf_spin_lock {
@ -223,12 +223,13 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
key_size = 0;
break;
case BPF_MAP_TYPE_SK_STORAGE:
case BPF_MAP_TYPE_INODE_STORAGE:
btf_key_type_id = 1;
btf_value_type_id = 3;
value_size = 8;
max_entries = 0;
map_flags = BPF_F_NO_PREALLOC;
btf_fd = load_sk_storage_btf();
btf_fd = load_local_storage_btf();
if (btf_fd < 0)
return false;
break;