Add buffer validation in smb2_set_info.
Cc: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
Cc: Ralph Böhme <slow@xxxxxxxxx>
Cc: Steve French <smfrench@xxxxxxxxx>
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
---
fs/ksmbd/smb2pdu.c | 113 +++++++++++++++++++++++++++++++++++----------
fs/ksmbd/smb2pdu.h | 9 ++++
2 files changed, 97 insertions(+), 25 deletions(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 46e0275a77a8..7763f69e1ae8 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -2107,17 +2107,23 @@ static noinline int create_smb2_pipe(struct ksmbd_work *work)
* smb2_set_ea() - handler for setting extended attributes using set
* info command
* @eabuf: set info command buffer
+ * @buf_len: set info command buffer length
* @path: dentry path for get ea
*
* Return: 0 on success, otherwise error
*/
-static int smb2_set_ea(struct smb2_ea_info *eabuf, struct path *path)
+static int smb2_set_ea(struct smb2_ea_info *eabuf, unsigned int buf_len,
+ struct path *path)
{
struct user_namespace *user_ns = mnt_user_ns(path->mnt);
char *attr_name = NULL, *value;
int rc = 0;
int next = 0;
+ if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength +
+ le16_to_cpu(eabuf->EaValueLength))
+ return -EINVAL;
+
attr_name = kmalloc(XATTR_NAME_MAX + 1, GFP_KERNEL);
if (!attr_name)
return -ENOMEM;
@@ -2181,7 +2187,13 @@ static int smb2_set_ea(struct smb2_ea_info *eabuf, struct path *path)
next:
next = le32_to_cpu(eabuf->NextEntryOffset);
+ if (next == 0 || buf_len < next)
+ break;
+ buf_len -= next;
eabuf = (struct smb2_ea_info *)((char *)eabuf + next);
+ if (next < eabuf->EaNameLength + le16_to_cpu(eabuf->EaValueLength))
+ break;
+
} while (next != 0);
kfree(attr_name);
@@ -2790,7 +2802,9 @@ int smb2_open(struct ksmbd_work *work)
created = true;
user_ns = mnt_user_ns(path.mnt);
if (ea_buf) {
- rc = smb2_set_ea(&ea_buf->ea, &path);
+ rc = smb2_set_ea(&ea_buf->ea,
+ le32_to_cpu(ea_buf->ccontext.DataLength),
+ &path);
if (rc == -EOPNOTSUPP)
rc = 0;
else if (rc)
@@ -5375,7 +5389,7 @@ static int smb2_rename(struct ksmbd_work *work,
static int smb2_create_link(struct ksmbd_work *work,
struct ksmbd_share_config *share,
struct smb2_file_link_info *file_info,
- struct file *filp,
+ int buf_len, struct file *filp,
struct nls_table *local_nls)
{
char *link_name = NULL, *target_name = NULL, *pathname = NULL;
@@ -5383,6 +5397,10 @@ static int smb2_create_link(struct ksmbd_work *work,
bool file_present = true;
int rc;
+ if (buf_len < sizeof(struct smb2_file_link_info) +
+ le32_to_cpu(file_info->FileNameLength))
+ return -EINVAL;
+
ksmbd_debug(SMB, "setting FILE_LINK_INFORMATION\n");
pathname = kmalloc(PATH_MAX, GFP_KERNEL);
if (!pathname)
@@ -5442,7 +5460,7 @@ static int smb2_create_link(struct ksmbd_work *work,
static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
struct ksmbd_share_config *share)
{
- struct smb2_file_all_info *file_info;
+ struct smb2_file_basic_info *file_info;
struct iattr attrs;
struct timespec64 ctime;
struct file *filp;
@@ -5453,7 +5471,7 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
if (!(fp->daccess & FILE_WRITE_ATTRIBUTES_LE))
return -EACCES;
- file_info = (struct smb2_file_all_info *)buf;
+ file_info = (struct smb2_file_basic_info *)buf;
attrs.ia_valid = 0;
filp = fp->filp;
inode = file_inode(filp);
@@ -5619,7 +5637,8 @@ static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
}
static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
- char *buf)
+ struct smb2_file_rename_info *rename_info,
+ int buf_len)
{
struct user_namespace *user_ns;
struct ksmbd_file *parent_fp;
@@ -5632,6 +5651,10 @@ static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
return -EACCES;
}
+ if (buf_len < sizeof(struct smb2_file_rename_info) +
+ le32_to_cpu(rename_info->FileNameLength))
+ return -EINVAL;
+
user_ns = file_mnt_user_ns(fp->filp);
if (ksmbd_stream_fd(fp))
goto next;
@@ -5654,8 +5677,7 @@ static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
}
}
next:
- return smb2_rename(work, fp, user_ns,
- (struct smb2_file_rename_info *)buf,
+ return smb2_rename(work, fp, user_ns, rename_info,
work->sess->conn->local_nls);
}
@@ -5741,40 +5763,71 @@ static int set_file_mode_info(struct ksmbd_file *fp, char *buf)
* TODO: need to implement an error handling for STATUS_INFO_LENGTH_MISMATCH
*/
static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp,
- int info_class, char *buf,
+ struct smb2_set_info_req *req,
struct ksmbd_share_config *share)
{
- switch (info_class) {
+ int buf_len = le32_to_cpu(req->BufferLength);
+
+ switch (req->FileInfoClass) {
case FILE_BASIC_INFORMATION:
- return set_file_basic_info(fp, buf, share);
+ {
+ if (buf_len < sizeof(struct smb2_file_basic_info))
+ return -EINVAL;
+ return set_file_basic_info(fp, req->Buffer, share);
+ }
case FILE_ALLOCATION_INFORMATION:
- return set_file_allocation_info(work, fp, buf);
+ {
+ if (buf_len < sizeof(struct smb2_file_alloc_info))
+ return -EINVAL;
+ return set_file_allocation_info(work, fp, req->Buffer);
+ }
case FILE_END_OF_FILE_INFORMATION:
- return set_end_of_file_info(work, fp, buf);
+ {
+ if (buf_len < sizeof(struct smb2_file_eof_info))
+ return -EINVAL;
+ return set_end_of_file_info(work, fp, req->Buffer);
+ }
case FILE_RENAME_INFORMATION:
+ {
if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
ksmbd_debug(SMB,
"User does not have write permission\n");
return -EACCES;
}
- return set_rename_info(work, fp, buf);
+ if (buf_len < sizeof(struct smb2_file_rename_info))
+ return -EINVAL;
+
+ return set_rename_info(work, fp,
+ (struct smb2_file_rename_info *)req->Buffer,
+ buf_len);
+ }
case FILE_LINK_INFORMATION:
+ {
+ if (buf_len < sizeof(struct smb2_file_link_info))
+ return -EINVAL;
+
return smb2_create_link(work, work->tcon->share_conf,
- (struct smb2_file_link_info *)buf, fp->filp,
+ (struct smb2_file_link_info *)req->Buffer,
+ buf_len, fp->filp,
work->sess->conn->local_nls);
-
+ }
case FILE_DISPOSITION_INFORMATION:
+ {
if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
ksmbd_debug(SMB,
"User does not have write permission\n");
return -EACCES;
}
- return set_file_disposition_info(fp, buf);
+ if (buf_len < sizeof(struct smb2_file_disposition_info))
+ return -EINVAL;
+
+ return set_file_disposition_info(fp, req->Buffer);
+ }
case FILE_FULL_EA_INFORMATION:
{
if (!(fp->daccess & FILE_WRITE_EA_LE)) {
@@ -5783,18 +5836,29 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp,
return -EACCES;
}
- return smb2_set_ea((struct smb2_ea_info *)buf,
- &fp->filp->f_path);
- }
+ if (buf_len < sizeof(struct smb2_ea_info))
+ return -EINVAL;
+ return smb2_set_ea((struct smb2_ea_info *)req->Buffer,
+ buf_len, &fp->filp->f_path);
+ }
case FILE_POSITION_INFORMATION:
- return set_file_position_info(fp, buf);
+ {
+ if (buf_len < sizeof(struct smb2_file_pos_info))
+ return -EINVAL;
+ return set_file_position_info(fp, req->Buffer);
+ }
case FILE_MODE_INFORMATION:
- return set_file_mode_info(fp, buf);
+ {
+ if (buf_len < sizeof(struct smb2_file_mode_info))
+ return -EINVAL;
+
+ return set_file_mode_info(fp, req->Buffer);
+ }
}
- pr_err("Unimplemented Fileinfoclass :%d\n", info_class);
+ pr_err("Unimplemented Fileinfoclass :%d\n", req->FileInfoClass);
return -EOPNOTSUPP;
}
@@ -5855,8 +5919,7 @@ int smb2_set_info(struct ksmbd_work *work)
switch (req->InfoType) {
case SMB2_O_INFO_FILE:
ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
- rc = smb2_set_info_file(work, fp, req->FileInfoClass,
- req->Buffer, work->tcon->share_conf);
+ rc = smb2_set_info_file(work, fp, req, work->tcon->share_conf);
break;
case SMB2_O_INFO_SECURITY:
ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
diff --git a/fs/ksmbd/smb2pdu.h b/fs/ksmbd/smb2pdu.h
index bcec845b03f3..261825d06391 100644
--- a/fs/ksmbd/smb2pdu.h
+++ b/fs/ksmbd/smb2pdu.h
@@ -1464,6 +1464,15 @@ struct smb2_file_all_info { /* data block encoding of response to level 18 */
char FileName[1];
} __packed; /* level 18 Query */
+struct smb2_file_basic_info { /* data block encoding of response to level 18 */
+ __le64 CreationTime; /* Beginning of FILE_BASIC_INFO equivalent */
+ __le64 LastAccessTime;
+ __le64 LastWriteTime;
+ __le64 ChangeTime;
+ __le32 Attributes;
+ __u32 Pad1; /* End of FILE_BASIC_INFO_INFO equivalent */
+} __packed;
+
struct smb2_file_alt_name_info {
__le32 FileNameLength;
char FileName[0];
--
2.25.1
