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[SRU,Mantic,1/1] ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16()

Message ID 20240205203402.28665-2-bethany.jamison@canonical.com
State New
Headers show
Series [SRU,Mantic,1/1] ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16() | expand

Commit Message

Bethany Jamison Feb. 5, 2024, 8:34 p.m. UTC 
From: Namjae Jeon <linkinjeon@kernel.org>

If ->NameOffset/Length is bigger than ->CreateContextsOffset/Length,
ksmbd_check_message doesn't validate request buffer it correctly.
So slab-out-of-bounds warning from calling smb_strndup_from_utf16()
in smb2_open() could happen. If ->NameLength is non-zero, Set the larger
of the two sums (Name and CreateContext size) as the offset and length of
the data area.

Reported-by: Yang Chaoming <lometsj@live.com>
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
(cherry picked from commit d10c77873ba1e9e6b91905018e29e196fd5f863d)
CVE-2024-22705
Signed-off-by: Bethany Jamison <bethany.jamison@canonical.com>
---
 fs/smb/server/smb2misc.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)
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Patch

diff --git a/fs/smb/server/smb2misc.c b/fs/smb/server/smb2misc.c
index e881df1d10cbd..401e439c5fe96 100644
--- a/fs/smb/server/smb2misc.c
+++ b/fs/smb/server/smb2misc.c
@@ -106,16 +106,25 @@  static int smb2_get_data_area_len(unsigned int *off, unsigned int *len,
 		break;
 	case SMB2_CREATE:
 	{
+		unsigned short int name_off =
+			le16_to_cpu(((struct smb2_create_req *)hdr)->NameOffset);
+		unsigned short int name_len =
+			le16_to_cpu(((struct smb2_create_req *)hdr)->NameLength);
+
 		if (((struct smb2_create_req *)hdr)->CreateContextsLength) {
 			*off = le32_to_cpu(((struct smb2_create_req *)
 				hdr)->CreateContextsOffset);
 			*len = le32_to_cpu(((struct smb2_create_req *)
 				hdr)->CreateContextsLength);
-			break;
+			if (!name_len)
+				break;
+
+			if (name_off + name_len < (u64)*off + *len)
+				break;
 		}
 
-		*off = le16_to_cpu(((struct smb2_create_req *)hdr)->NameOffset);
-		*len = le16_to_cpu(((struct smb2_create_req *)hdr)->NameLength);
+		*off = name_off;
+		*len = name_len;
 		break;
 	}
 	case SMB2_QUERY_INFO: