This is a note to let you know that I've just added the patch titled
smb: client: fix OOB in SMB2_query_info_init()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
smb-client-fix-oob-in-smb2_query_info_init.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 33eae65c6f49770fec7a662935d4eb4a6406d24b Mon Sep 17 00:00:00 2001
From: Paulo Alcantara <pc@xxxxxxxxxxxxx>
Date: Wed, 13 Dec 2023 12:25:57 -0300
Subject: smb: client: fix OOB in SMB2_query_info_init()
From: Paulo Alcantara <pc@xxxxxxxxxxxxx>
commit 33eae65c6f49770fec7a662935d4eb4a6406d24b upstream.
A small CIFS buffer (448 bytes) isn't big enough to hold
SMB2_QUERY_INFO request along with user's input data from
CIFS_QUERY_INFO ioctl. That is, if the user passed an input buffer >
344 bytes, the client will memcpy() off the end of @req->Buffer in
SMB2_query_info_init() thus causing the following KASAN splat:
BUG: KASAN: slab-out-of-bounds in SMB2_query_info_init+0x242/0x250 [cifs]
Write of size 1023 at addr ffff88801308c5a8 by task a.out/1240
CPU: 1 PID: 1240 Comm: a.out Not tainted 6.7.0-rc4 #5
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x4a/0x80
print_report+0xcf/0x650
? srso_alias_return_thunk+0x5/0xfbef5
? srso_alias_return_thunk+0x5/0xfbef5
? srso_alias_return_thunk+0x5/0xfbef5
? __phys_addr+0x46/0x90
kasan_report+0xd8/0x110
? SMB2_query_info_init+0x242/0x250 [cifs]
? SMB2_query_info_init+0x242/0x250 [cifs]
kasan_check_range+0x105/0x1b0
__asan_memcpy+0x3c/0x60
SMB2_query_info_init+0x242/0x250 [cifs]
? __pfx_SMB2_query_info_init+0x10/0x10 [cifs]
? srso_alias_return_thunk+0x5/0xfbef5
? smb_rqst_len+0xa6/0xc0 [cifs]
smb2_ioctl_query_info+0x4f4/0x9a0 [cifs]
? __pfx_smb2_ioctl_query_info+0x10/0x10 [cifs]
? __pfx_cifsConvertToUTF16+0x10/0x10 [cifs]
? kasan_set_track+0x25/0x30
? srso_alias_return_thunk+0x5/0xfbef5
? __kasan_kmalloc+0x8f/0xa0
? srso_alias_return_thunk+0x5/0xfbef5
? cifs_strndup_to_utf16+0x12d/0x1a0 [cifs]
? __build_path_from_dentry_optional_prefix+0x19d/0x2d0 [cifs]
? __pfx_smb2_ioctl_query_info+0x10/0x10 [cifs]
cifs_ioctl+0x11c7/0x1de0 [cifs]
? __pfx_cifs_ioctl+0x10/0x10 [cifs]
? srso_alias_return_thunk+0x5/0xfbef5
? rcu_is_watching+0x23/0x50
? srso_alias_return_thunk+0x5/0xfbef5
? __rseq_handle_notify_resume+0x6cd/0x850
? __pfx___schedule+0x10/0x10
? blkcg_iostat_update+0x250/0x290
? srso_alias_return_thunk+0x5/0xfbef5
? ksys_write+0xe9/0x170
__x64_sys_ioctl+0xc9/0x100
do_syscall_64+0x47/0xf0
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f893dde49cf
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48
89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89>
c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007ffc03ff4160 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffc03ff4378 RCX: 00007f893dde49cf
RDX: 00007ffc03ff41d0 RSI: 00000000c018cf07 RDI: 0000000000000003
RBP: 00007ffc03ff4260 R08: 0000000000000410 R09: 0000000000000001
R10: 00007f893dce7300 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc03ff4388 R14: 00007f893df15000 R15: 0000000000406de0
</TASK>
Fix this by increasing size of SMB2_QUERY_INFO request buffers and
validating input length to prevent other callers from overflowing @req
in SMB2_query_info_init() as well.
Fixes: f5b05d622a3e ("cifs: add IOCTL for QUERY_INFO passthrough to userspace")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Robert Morris <rtm@xxxxxxxxxxxxx>
Signed-off-by: Paulo Alcantara <pc@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/smb/client/smb2pdu.c | 29 ++++++++++++++++++++++-------
1 file changed, 22 insertions(+), 7 deletions(-)
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -372,10 +372,15 @@ static int __smb2_plain_req_init(__le16
void **request_buf, unsigned int *total_len)
{
/* BB eventually switch this to SMB2 specific small buf size */
- if (smb2_command == SMB2_SET_INFO)
+ switch (smb2_command) {
+ case SMB2_SET_INFO:
+ case SMB2_QUERY_INFO:
*request_buf = cifs_buf_get();
- else
+ break;
+ default:
*request_buf = cifs_small_buf_get();
+ break;
+ }
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
@@ -3523,8 +3528,13 @@ SMB2_query_info_init(struct cifs_tcon *t
struct smb2_query_info_req *req;
struct kvec *iov = rqst->rq_iov;
unsigned int total_len;
+ size_t len;
int rc;
+ if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
+ len > CIFSMaxBufSize))
+ return -EINVAL;
+
rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
(void **) &req, &total_len);
if (rc)
@@ -3546,7 +3556,7 @@ SMB2_query_info_init(struct cifs_tcon *t
iov[0].iov_base = (char *)req;
/* 1 for Buffer */
- iov[0].iov_len = total_len - 1 + input_len;
+ iov[0].iov_len = len;
return 0;
}
@@ -3554,7 +3564,7 @@ void
SMB2_query_info_free(struct smb_rqst *rqst)
{
if (rqst && rqst->rq_iov)
- cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+ cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
static int
@@ -5439,6 +5449,11 @@ build_qfs_info_req(struct kvec *iov, str
return 0;
}
+static inline void free_qfs_info_req(struct kvec *iov)
+{
+ cifs_buf_release(iov->iov_base);
+}
+
int
SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
@@ -5470,7 +5485,7 @@ SMB311_posix_qfs_info(const unsigned int
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
- cifs_small_buf_release(iov.iov_base);
+ free_qfs_info_req(&iov);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto posix_qfsinf_exit;
@@ -5521,7 +5536,7 @@ SMB2_QFS_info(const unsigned int xid, st
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
- cifs_small_buf_release(iov.iov_base);
+ free_qfs_info_req(&iov);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qfsinf_exit;
@@ -5588,7 +5603,7 @@ SMB2_QFS_attr(const unsigned int xid, st
rc = cifs_send_recv(xid, ses, server,
&rqst, &resp_buftype, flags, &rsp_iov);
- cifs_small_buf_release(iov.iov_base);
+ free_qfs_info_req(&iov);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qfsattr_exit;
Patches currently in stable-queue which might be from pc@xxxxxxxxxxxxx are
queue-6.1/smb-client-fix-oob-in-cifsd-when-receiving-compounded-resps.patch
queue-6.1/smb-client-fix-oob-in-smb2_query_info_init.patch
queue-6.1/smb-client-fix-potential-oob-in-cifs_dump_detail.patch
queue-6.1/smb-client-fix-oob-in-smbcalcsize.patch
