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bpf: Make btf_load command to be bpfptr_t compatible.

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Similar to prog_load make btf_load command to be availble to
bpf_prog_type_syscall program.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-7-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-05-13 17:36:08 -07:00 • committed by Daniel Borkmann
parent 00899e7e8d
commit c571bd752e
3 changed files with 9 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/btf.h
View file

@ -21,7 +21,7 @@ extern const struct file_operations btf_fops;
void btf_get(struct btf *btf); void btf_get(struct btf *btf);
void btf_put(struct btf *btf); void btf_put(struct btf *btf);
int btf_new_fd(const union bpf_attr *attr); int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr);
struct btf *btf_get_by_fd(int fd); struct btf *btf_get_by_fd(int fd);
int btf_get_info_by_fd(const struct btf *btf, int btf_get_info_by_fd(const struct btf *btf,
const union bpf_attr *attr, const union bpf_attr *attr,

8
kernel/bpf/btf.c
View file

@ -4257,7 +4257,7 @@ static int btf_parse_hdr(struct btf_verifier_env *env)
return 0; return 0;
} }
static struct btf *btf_parse(void __user *btf_data, u32 btf_data_size, static struct btf *btf_parse(bpfptr_t btf_data, u32 btf_data_size,
u32 log_level, char __user *log_ubuf, u32 log_size) u32 log_level, char __user *log_ubuf, u32 log_size)
{ {
struct btf_verifier_env *env = NULL; struct btf_verifier_env *env = NULL;
@ -4306,7 +4306,7 @@ static struct btf *btf_parse(void __user *btf_data, u32 btf_data_size,
btf->data = data; btf->data = data;
btf->data_size = btf_data_size; btf->data_size = btf_data_size;
if (copy_from_user(data, btf_data, btf_data_size)) { if (copy_from_bpfptr(data, btf_data, btf_data_size)) {
err = -EFAULT; err = -EFAULT;
goto errout; goto errout;
} }
@ -5780,12 +5780,12 @@ static int __btf_new_fd(struct btf *btf)
return anon_inode_getfd("btf", &btf_fops, btf, O_RDONLY | O_CLOEXEC); return anon_inode_getfd("btf", &btf_fops, btf, O_RDONLY | O_CLOEXEC);
} }
int btf_new_fd(const union bpf_attr *attr) int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr)
{ {
struct btf *btf; struct btf *btf;
int ret; int ret;
btf = btf_parse(u64_to_user_ptr(attr->btf), btf = btf_parse(make_bpfptr(attr->btf, uattr.is_kernel),
attr->btf_size, attr->btf_log_level, attr->btf_size, attr->btf_log_level,
u64_to_user_ptr(attr->btf_log_buf), u64_to_user_ptr(attr->btf_log_buf),
attr->btf_log_size); attr->btf_log_size);

7
kernel/bpf/syscall.c
View file

@ -3842,7 +3842,7 @@ static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
#define BPF_BTF_LOAD_LAST_FIELD btf_log_level #define BPF_BTF_LOAD_LAST_FIELD btf_log_level
static int bpf_btf_load(const union bpf_attr *attr) static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr)
{ {
if (CHECK_ATTR(BPF_BTF_LOAD)) if (CHECK_ATTR(BPF_BTF_LOAD))
return -EINVAL; return -EINVAL;
@ -3850,7 +3850,7 @@ static int bpf_btf_load(const union bpf_attr *attr)
if (!bpf_capable()) if (!bpf_capable())
return -EPERM; return -EPERM;
return btf_new_fd(attr); return btf_new_fd(attr, uattr);
} }
#define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
@ -4471,7 +4471,7 @@ static int __sys_bpf(int cmd, bpfptr_t uattr, unsigned int size)
err = bpf_raw_tracepoint_open(&attr); err = bpf_raw_tracepoint_open(&attr);
break; break;
case BPF_BTF_LOAD: case BPF_BTF_LOAD:
err = bpf_btf_load(&attr); err = bpf_btf_load(&attr, uattr);
break; break;
case BPF_BTF_GET_FD_BY_ID: case BPF_BTF_GET_FD_BY_ID:
err = bpf_btf_get_fd_by_id(&attr); err = bpf_btf_get_fd_by_id(&attr);
@ -4552,6 +4552,7 @@ BPF_CALL_3(bpf_sys_bpf, int, cmd, void *, attr, u32, attr_size)
case BPF_MAP_UPDATE_ELEM: case BPF_MAP_UPDATE_ELEM:
case BPF_MAP_FREEZE: case BPF_MAP_FREEZE:
case BPF_PROG_LOAD: case BPF_PROG_LOAD:
case BPF_BTF_LOAD:
break; break;
/* case BPF_PROG_TEST_RUN: /* case BPF_PROG_TEST_RUN:
* is not part of this list to prevent recursive test_run * is not part of this list to prevent recursive test_run