diff mbox series

[v4,bpf-next,06/22] bpf: Make btf_load command to be bpfptr_t compatible.

Message ID 20210508034837.64585-7-alexei.starovoitov@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: syscall program, FD array, loader program, light skeleton. | expand

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Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count fail Series longer than 15 patches
netdev/tree_selection success Clearly marked for bpf-next
netdev/subject_prefix success Link
netdev/cc_maintainers warning 9 maintainers not CCed: netdev@vger.kernel.org haoluo@google.com yhs@fb.com kpsingh@kernel.org jolsa@kernel.org kafai@fb.com ast@kernel.org songliubraving@fb.com alan.maguire@oracle.com
netdev/source_inline success Was 0 now: 0
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netdev/module_param success Was 0 now: 0
netdev/build_32bit fail Errors and warnings before: 125 this patch: 127
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success Link
netdev/checkpatch warning WARNING: 'availble' may be misspelled - perhaps 'available'?
netdev/build_allmodconfig_warn fail Errors and warnings before: 125 this patch: 127
netdev/header_inline success Link

Commit Message

Alexei Starovoitov May 8, 2021, 3:48 a.m. UTC 
From: Alexei Starovoitov <ast@kernel.org>

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>
---
 include/linux/btf.h  | 2 +-
 kernel/bpf/btf.c     | 8 ++++----
 kernel/bpf/syscall.c | 7 ++++---
 3 files changed, 9 insertions(+), 8 deletions(-)

Comments

Andrii Nakryiko May 11, 2021, 10:41 p.m. UTC | #1 
On Fri, May 7, 2021 at 8:48 PM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> From: Alexei Starovoitov <ast@kernel.org>
>
> 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>
> ---

Acked-by: Andrii Nakryiko <andrii@kernel.org>

>  include/linux/btf.h  | 2 +-
>  kernel/bpf/btf.c     | 8 ++++----
>  kernel/bpf/syscall.c | 7 ++++---
>  3 files changed, 9 insertions(+), 8 deletions(-)
>

[...]
diff mbox series

Patch

diff --git a/include/linux/btf.h b/include/linux/btf.h
index 3bac66e0183a..94a0c976c90f 100644
--- a/include/linux/btf.h
+++ b/include/linux/btf.h
@@ -21,7 +21,7 @@  extern const struct file_operations btf_fops;
 
 void btf_get(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);
 int btf_get_info_by_fd(const struct btf *btf,
 		       const union bpf_attr *attr,
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 0600ed325fa0..fbf6c06a9d62 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -4257,7 +4257,7 @@  static int btf_parse_hdr(struct btf_verifier_env *env)
 	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)
 {
 	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_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;
 		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);
 }
 
-int btf_new_fd(const union bpf_attr *attr)
+int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr)
 {
 	struct btf *btf;
 	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,
 			u64_to_user_ptr(attr->btf_log_buf),
 			attr->btf_log_size);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 28387fe149ba..415865c49dd4 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -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
 
-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))
 		return -EINVAL;
@@ -3850,7 +3850,7 @@  static int bpf_btf_load(const union bpf_attr *attr)
 	if (!bpf_capable())
 		return -EPERM;
 
-	return btf_new_fd(attr);
+	return btf_new_fd(attr, uattr);
 }
 
 #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);
 		break;
 	case BPF_BTF_LOAD:
-		err = bpf_btf_load(&attr);
+		err = bpf_btf_load(&attr, uattr);
 		break;
 	case BPF_BTF_GET_FD_BY_ID:
 		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_FREEZE:
 	case BPF_PROG_LOAD:
+	case BPF_BTF_LOAD:
 		break;
 	/* case BPF_PROG_TEST_RUN:
 	 * is not part of this list to prevent recursive test_run