[PATCH bpf-next v7 07/24] bpf: prepare for more bpf syscall to be used from kernel and user space.
From: Benjamin Tissoires <hidden>
Date: 2022-07-21 15:38:39
Also in:
bpf, linux-doc, linux-input, linux-kselftest, lkml
Subsystem:
bpf [core], bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
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 <redacted> Signed-off-by: Benjamin Tissoires <redacted> --- no changes in v7 changes in v6: - commit description change new in v5 --- kernel/bpf/syscall.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 83c7136c5788..776c7a37c433 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c@@ -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;
@@ -4942,7 +4942,7 @@ 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);
@@ -5077,8 +5077,10 @@ 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:
--
2.36.1