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bpf: prepare for more bpf syscall to be used from kernel and user space.

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Add BPF_MAP_GET_FD_BY_ID and BPF_MAP_DELETE_PROG.

Only BPF_MAP_GET_FD_BY_ID needs to be amended to be able
to access the bpf pointer either from the userspace or the kernel.

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220824134055.1328882-7-benjamin.tissoires@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Benjamin Tissoires 2022-08-24 15:40:36 +02:00 committed by Alexei Starovoitov
parent d4ffb6f39f
commit b88df69796
1 changed files with 6 additions and 4 deletions
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10
kernel/bpf/syscall.c
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@ -1437,9 +1437,9 @@ static int map_update_elem(union bpf_attr *attr, bpfptr_t uattr)
#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
static int map_delete_elem(union bpf_attr *attr)
static int map_delete_elem(union bpf_attr *attr, bpfptr_t uattr)
{
void __user *ukey = u64_to_user_ptr(attr->key);
bpfptr_t ukey = make_bpfptr(attr->key, uattr.is_kernel);
int ufd = attr->map_fd;
struct bpf_map *map;
struct fd f;
@ -1459,7 +1459,7 @@ static int map_delete_elem(union bpf_attr *attr)
goto err_put;
}
key = __bpf_copy_key(ukey, map->key_size);
key = ___bpf_copy_key(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
@ -4941,7 +4941,7 @@ static int __sys_bpf(int cmd, bpfptr_t uattr, unsigned int size)
err = map_update_elem(&attr, uattr);
break;
case BPF_MAP_DELETE_ELEM:
err = map_delete_elem(&attr);
err = map_delete_elem(&attr, uattr);
break;
case BPF_MAP_GET_NEXT_KEY:
err = map_get_next_key(&attr);
@ -5073,8 +5073,10 @@ BPF_CALL_3(bpf_sys_bpf, int, cmd, union bpf_attr *, attr, u32, attr_size)
{
switch (cmd) {
case BPF_MAP_CREATE:
case BPF_MAP_DELETE_ELEM:
case BPF_MAP_UPDATE_ELEM:
case BPF_MAP_FREEZE:
case BPF_MAP_GET_FD_BY_ID:
case BPF_PROG_LOAD:
case BPF_BTF_LOAD:
case BPF_LINK_CREATE: