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824d4f64c2
linux/fs/ksmbd
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Hyunchul Lee 824d4f64c2 ksmbd: prevent out of bound read for SMB2_TREE_CONNNECT 
if Status is not 0 and PathLength is long,
smb_strndup_from_utf16 could make out of bound
read in smb2_tree_connnect.

This bug can lead an oops looking something like:

[ 1553.882047] BUG: KASAN: slab-out-of-bounds in smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882064] Read of size 2 at addr ffff88802c4eda04 by task kworker/0:2/42805
...
[ 1553.882095] Call Trace:
[ 1553.882098]  <TASK>
[ 1553.882101]  dump_stack_lvl+0x49/0x5f
[ 1553.882107]  print_report.cold+0x5e/0x5cf
[ 1553.882112]  ? smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882122]  kasan_report+0xaa/0x120
[ 1553.882128]  ? smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882139]  __asan_report_load_n_noabort+0xf/0x20
[ 1553.882143]  smb_strndup_from_utf16+0x469/0x4c0 [ksmbd]
[ 1553.882155]  ? smb_strtoUTF16+0x3b0/0x3b0 [ksmbd]
[ 1553.882166]  ? __kmalloc_node+0x185/0x430
[ 1553.882171]  smb2_tree_connect+0x140/0xab0 [ksmbd]
[ 1553.882185]  handle_ksmbd_work+0x30e/0x1020 [ksmbd]
[ 1553.882197]  process_one_work+0x778/0x11c0
[ 1553.882201]  ? _raw_spin_lock_irq+0x8e/0xe0
[ 1553.882206]  worker_thread+0x544/0x1180
[ 1553.882209]  ? __cpuidle_text_end+0x4/0x4
[ 1553.882214]  kthread+0x282/0x320
[ 1553.882218]  ? process_one_work+0x11c0/0x11c0
[ 1553.882221]  ? kthread_complete_and_exit+0x30/0x30
[ 1553.882225]  ret_from_fork+0x1f/0x30
[ 1553.882231]  </TASK>

There is no need to check error request validation in server.
This check allow invalid requests not to validate message.

Fixes: e2f34481b2 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-17818
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
2022-07-31 23:14:32 -05:00
..
mgmt ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
asn1.c ksmbd: use oid registry functions to decode OIDs 2021-12-28 22:47:22 -06:00
asn1.h
auth.c ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
auth.h ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
connection.c ksmbd: use wait_event instead of schedule_timeout() 2022-07-31 23:14:32 -05:00
connection.h ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
crypto_ctx.c ksmbd: remove NTLMv1 authentication 2021-09-29 16:17:34 -05:00
crypto_ctx.h ksmbd: remove NTLMv1 authentication 2021-09-29 16:17:34 -05:00
glob.h ksmbd: fix version mismatch with out of tree 2021-10-07 10:18:34 -05:00
Kconfig ksmbd: remove md4 leftovers 2021-11-11 19:22:58 -06:00
ksmbd_netlink.h ksmbd: add smbd max io size parameter 2022-05-21 15:01:43 -05:00
ksmbd_spnego_negtokeninit.asn1
ksmbd_spnego_negtokentarg.asn1
ksmbd_work.c ksmbd: Remove redundant 'flush_workqueue()' calls 2021-11-06 23:52:06 -05:00
ksmbd_work.h ksmbd: remove smb2_buf_length in smb2_hdr 2021-11-11 19:22:58 -06:00
Makefile
misc.c ksmbd: Fix some kernel-doc comments 2022-05-21 15:01:43 -05:00
misc.h ksmbd: remove filename in ksmbd_file 2022-04-14 20:56:13 -05:00
ndr.c ksmbd: fix error code in ndr_read_int32() 2021-12-16 12:36:49 -06:00
ndr.h ksmbd: add user namespace support 2021-07-02 16:27:10 +09:00
nterr.h
ntlmssp.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
oplock.c ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
oplock.h ksmbd: remove filename in ksmbd_file 2022-04-14 20:56:13 -05:00
server.c ksmbd: use wait_event instead of schedule_timeout() 2022-07-31 23:14:32 -05:00
server.h ksmbd: change server config string index to enumeration 2021-06-30 14:44:01 +09:00
smb2misc.c ksmbd: prevent out of bound read for SMB2_TREE_CONNNECT 2022-07-31 23:14:32 -05:00
smb2ops.c ksmbd: add support for smb2 max credit parameter 2022-01-10 12:44:19 -06:00
smb2pdu.c ksmbd: prevent out of bound read for SMB2_WRITE 2022-07-31 23:14:32 -05:00
smb2pdu.h 14 fixes to cifs client and to smbfs_common code 2022-04-01 14:31:57 -07:00
smb_common.c ksmbd: fix outstanding credits related bugs 2022-05-21 15:01:43 -05:00
smb_common.h ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
smbacl.c ksmbd: fix reference count leak in smb_check_perm_dacl() 2022-05-09 22:23:01 -05:00
smbacl.h fs: use low-level mapping helpers 2021-12-03 18:58:11 +01:00
smbfsctl.h
smbstatus.h
transport_ipc.c ksmbd: add smbd max io size parameter 2022-05-21 15:01:43 -05:00
transport_ipc.h ksmbd: throttle session setup failures to avoid dictionary attacks 2021-10-20 00:07:10 -05:00
transport_rdma.c ksmbd: smbd: Remove useless license text when SPDX-License-Identifier is already used 2022-06-11 11:18:26 -05:00
transport_rdma.h ksmbd: fix wrong smbd max read/write size check 2022-05-21 15:01:43 -05:00
transport_tcp.c ksmbd: use SOCK_NONBLOCK type for kernel_accept() 2022-06-11 11:18:26 -05:00
transport_tcp.h
unicode.c
unicode.h
uniupr.h
vfs_cache.c ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
vfs_cache.h ksmbd: remove filename in ksmbd_file 2022-04-14 20:56:13 -05:00
vfs.c ksmbd: fix racy issue while destroying session on multichannel 2022-07-31 23:14:32 -05:00
vfs.h ksmbd: don't align last entry offset in smb2 query directory 2022-02-04 00:12:22 -06:00
xattr.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00