diff options
| author | Toke Hoiland-Jorgensen <toke@redhat.com> | 2022-01-21 11:10:02 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-01-21 14:14:03 -0800 |
| commit | f45d5b6ce2e835834c94b8b700787984f02cd662 (patch) | |
| tree | ed4902ab21d3d6389bb0327279efc6e684ce4032 /kernel/bpf/syscall.c | |
| parent | 082c4bfba4f77d6c65b451d7ef23093a75cc50e7 (diff) | |
bpf: generalise tail call map compatibility check
The check for tail call map compatibility ensures that tail calls only
happen between maps of the same type. To ensure backwards compatibility for
XDP frags we need a similar type of check for cpumap and devmap
programs, so move the state from bpf_array_aux into bpf_map, add
xdp_has_frags to the check, and apply the same check to cpumap and devmap.
Acked-by: John Fastabend <john.fastabend@gmail.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/f19fd97c0328a39927f3ad03e1ca6b43fd53cdfd.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index f29090643c6e..72ce1edde950 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -556,16 +556,14 @@ static unsigned long bpf_map_memory_footprint(const struct bpf_map *map) static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) { - const struct bpf_map *map = filp->private_data; - const struct bpf_array *array; + struct bpf_map *map = filp->private_data; u32 type = 0, jited = 0; - if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { - array = container_of(map, struct bpf_array, map); - spin_lock(&array->aux->owner.lock); - type = array->aux->owner.type; - jited = array->aux->owner.jited; - spin_unlock(&array->aux->owner.lock); + if (map_type_contains_progs(map)) { + spin_lock(&map->owner.lock); + type = map->owner.type; + jited = map->owner.jited; + spin_unlock(&map->owner.lock); } seq_printf(m, @@ -874,6 +872,7 @@ static int map_create(union bpf_attr *attr) atomic64_set(&map->refcnt, 1); atomic64_set(&map->usercnt, 1); mutex_init(&map->freeze_mutex); + spin_lock_init(&map->owner.lock); map->spin_lock_off = -EINVAL; map->timer_off = -EINVAL; |