This is a note to let you know that I've just added the patch titled
ksmbd: fix UAF issue from opinfo->conn
to the 5.15-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:
ksmbd-fix-uaf-issue-from-opinfo-conn.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From linkinjeon@xxxxxxxxx Mon Dec 18 16:40:30 2023
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Tue, 19 Dec 2023 00:33:56 +0900
Subject: ksmbd: fix UAF issue from opinfo->conn
To: gregkh@xxxxxxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
Cc: smfrench@xxxxxxxxx, Namjae Jeon <linkinjeon@xxxxxxxxxx>, Per Forlin <per.forlin@xxxxxxxx>, Steve French <stfrench@xxxxxxxxxxxxx>
Message-ID: <20231218153454.8090-97-linkinjeon@xxxxxxxxxx>
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
[ Upstream commit 36322523dddb11107e9f7f528675a0dec2536103 ]
If opinfo->conn is another connection and while ksmbd send oplock break
request to cient on current connection, The connection for opinfo->conn
can be disconnect and conn could be freed. When sending oplock break
request, this ksmbd_conn can be used and cause user-after-free issue.
When getting opinfo from the list, ksmbd check connection is being
released. If it is not released, Increase ->r_count to wait that connection
is freed.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Per Forlin <per.forlin@xxxxxxxx>
Tested-by: Per Forlin <per.forlin@xxxxxxxx>
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ksmbd/oplock.c | 72 +++++++++++++++++++++++++++++++++++-------------------
1 file changed, 47 insertions(+), 25 deletions(-)
--- a/fs/ksmbd/oplock.c
+++ b/fs/ksmbd/oplock.c
@@ -157,13 +157,42 @@ static struct oplock_info *opinfo_get_li
rcu_read_lock();
opinfo = list_first_or_null_rcu(&ci->m_op_list, struct oplock_info,
op_entry);
- if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
- opinfo = NULL;
+ if (opinfo) {
+ if (!atomic_inc_not_zero(&opinfo->refcount))
+ opinfo = NULL;
+ else {
+ atomic_inc(&opinfo->conn->r_count);
+ if (ksmbd_conn_releasing(opinfo->conn)) {
+ atomic_dec(&opinfo->conn->r_count);
+ atomic_dec(&opinfo->refcount);
+ opinfo = NULL;
+ }
+ }
+ }
+
rcu_read_unlock();
return opinfo;
}
+static void opinfo_conn_put(struct oplock_info *opinfo)
+{
+ struct ksmbd_conn *conn;
+
+ if (!opinfo)
+ return;
+
+ conn = opinfo->conn;
+ /*
+ * Checking waitqueue to dropping pending requests on
+ * disconnection. waitqueue_active is safe because it
+ * uses atomic operation for condition.
+ */
+ if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
+ wake_up(&conn->r_count_q);
+ opinfo_put(opinfo);
+}
+
void opinfo_put(struct oplock_info *opinfo)
{
if (!atomic_dec_and_test(&opinfo->refcount))
@@ -666,13 +695,6 @@ static void __smb2_oplock_break_noti(str
out:
ksmbd_free_work_struct(work);
- /*
- * Checking waitqueue to dropping pending requests on
- * disconnection. waitqueue_active is safe because it
- * uses atomic operation for condition.
- */
- if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
- wake_up(&conn->r_count_q);
}
/**
@@ -706,7 +728,6 @@ static int smb2_oplock_break_noti(struct
work->conn = conn;
work->sess = opinfo->sess;
- atomic_inc(&conn->r_count);
if (opinfo->op_state == OPLOCK_ACK_WAIT) {
INIT_WORK(&work->work, __smb2_oplock_break_noti);
ksmbd_queue_work(work);
@@ -776,13 +797,6 @@ static void __smb2_lease_break_noti(stru
out:
ksmbd_free_work_struct(work);
- /*
- * Checking waitqueue to dropping pending requests on
- * disconnection. waitqueue_active is safe because it
- * uses atomic operation for condition.
- */
- if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
- wake_up(&conn->r_count_q);
}
/**
@@ -822,7 +836,6 @@ static int smb2_lease_break_noti(struct
work->conn = conn;
work->sess = opinfo->sess;
- atomic_inc(&conn->r_count);
if (opinfo->op_state == OPLOCK_ACK_WAIT) {
list_for_each_safe(tmp, t, &opinfo->interim_list) {
struct ksmbd_work *in_work;
@@ -1144,8 +1157,10 @@ int smb_grant_oplock(struct ksmbd_work *
}
prev_opinfo = opinfo_get_list(ci);
if (!prev_opinfo ||
- (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx))
+ (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx)) {
+ opinfo_conn_put(prev_opinfo);
goto set_lev;
+ }
prev_op_has_lease = prev_opinfo->is_lease;
if (prev_op_has_lease)
prev_op_state = prev_opinfo->o_lease->state;
@@ -1153,19 +1168,19 @@ int smb_grant_oplock(struct ksmbd_work *
if (share_ret < 0 &&
prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
err = share_ret;
- opinfo_put(prev_opinfo);
+ opinfo_conn_put(prev_opinfo);
goto err_out;
}
if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
- opinfo_put(prev_opinfo);
+ opinfo_conn_put(prev_opinfo);
goto op_break_not_needed;
}
list_add(&work->interim_entry, &prev_opinfo->interim_list);
err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II);
- opinfo_put(prev_opinfo);
+ opinfo_conn_put(prev_opinfo);
if (err == -ENOENT)
goto set_lev;
/* Check all oplock was freed by close */
@@ -1228,14 +1243,14 @@ static void smb_break_all_write_oplock(s
return;
if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
- opinfo_put(brk_opinfo);
+ opinfo_conn_put(brk_opinfo);
return;
}
brk_opinfo->open_trunc = is_trunc;
list_add(&work->interim_entry, &brk_opinfo->interim_list);
oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II);
- opinfo_put(brk_opinfo);
+ opinfo_conn_put(brk_opinfo);
}
/**
@@ -1263,6 +1278,13 @@ void smb_break_all_levII_oplock(struct k
list_for_each_entry_rcu(brk_op, &ci->m_op_list, op_entry) {
if (!atomic_inc_not_zero(&brk_op->refcount))
continue;
+
+ atomic_inc(&brk_op->conn->r_count);
+ if (ksmbd_conn_releasing(brk_op->conn)) {
+ atomic_dec(&brk_op->conn->r_count);
+ continue;
+ }
+
rcu_read_unlock();
if (brk_op->is_lease && (brk_op->o_lease->state &
(~(SMB2_LEASE_READ_CACHING_LE |
@@ -1292,7 +1314,7 @@ void smb_break_all_levII_oplock(struct k
brk_op->open_trunc = is_trunc;
oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE);
next:
- opinfo_put(brk_op);
+ opinfo_conn_put(brk_op);
rcu_read_lock();
}
rcu_read_unlock();
Patches currently in stable-queue which might be from linkinjeon@xxxxxxxxx are
queue-5.15/ksmbd-fix-uaf-issue-from-opinfo-conn.patch
queue-5.15/ksmbd-fix-race-condition-from-parallel-smb2-lock-requests.patch
queue-5.15/ksmbd-validate-session-id-and-tree-id-in-compound-request.patch
queue-5.15/ksmbd-reorganize-ksmbd_iov_pin_rsp.patch
queue-5.15/ksmbd-convert-to-use-sysfs_emit-sysfs_emit_at-apis.patch
queue-5.15/ksmbd-validate-length-in-smb2_write.patch
queue-5.15/ksmbd-add-support-for-key-exchange.patch
queue-5.15/ksmbd-request-update-to-stale-share-config.patch
queue-5.15/ksmbd-remove-generic_fillattr-use-in-smb2_open.patch
queue-5.15/ksmbd-fix-uninitialized-pointer-read-in-smb2_create_link.patch
queue-5.15/ksmbd-set-smb2_session_flag_encrypt_data-when-enforcing-data-encryption-for-this-share.patch
queue-5.15/ksmbd-constify-struct-path.patch
queue-5.15/ksmbd-casefold-utf-8-share-names-and-fix-ascii-lowercase-conversion.patch
queue-5.15/ksmbd-validate-smb-request-protocol-id.patch
queue-5.15/ksmbd-avoid-out-of-bounds-access-in-decode_preauth_ctxt.patch
queue-5.15/ksmbd-release-interim-response-after-sending-status-pending-response.patch
queue-5.15/ksmbd-fix-racy-issue-under-cocurrent-smb2-tree-disconnect.patch
queue-5.15/ksmbd-fix-out-of-bounds-read-in-smb2_sess_setup.patch
queue-5.15/ksmbd-decrease-the-number-of-smb3-smbdirect-server-sges.patch
queue-5.15/ksmbd-make-utf-8-file-name-comparison-work-in-__caseless_lookup.patch
queue-5.15/ksmbd-use-f_setlk-when-unlocking-a-file.patch
queue-5.15/fs-introduce-lock_rename_child-helper.patch
queue-5.15/ksmbd-use-kzalloc-instead-of-__gfp_zero.patch
queue-5.15/ksmbd-set-ntlmssp_negotiate_seal-flag-to-challenge-blob.patch
queue-5.15/ksmbd-call-ib_drain_qp-when-disconnected.patch
queue-5.15/ksmbd-fix-posix_acls-and-acls-dereferencing-possible-err_ptr.patch
queue-5.15/ksmbd-destroy-expired-sessions.patch
queue-5.15/ksmbd-fix-resource-leak-in-smb2_lock.patch
queue-5.15/ksmbd-check-iov-vector-index-in-ksmbd_conn_write.patch
queue-5.15/ksmbd-hide-socket-error-message-when-ipv6-config-is-disable.patch
queue-5.15/ksmbd-use-netif_is_bridge_port.patch
queue-5.15/ksmbd-smbd-simplify-tracking-pending-packets.patch
queue-5.15/ksmbd-implements-sess-rpc_handle_list-as-xarray.patch
queue-5.15/ksmbd-remove-duplicate-flag-set-in-smb2_write.patch
queue-5.15/ksmbd-separately-allocate-ci-per-dentry.patch
queue-5.15/ksmbd-fix-racy-issue-from-session-setup-and-logoff.patch
queue-5.15/ksmbd-fix-race-condition-between-session-lookup-and-expire.patch
queue-5.15/ksmbd-fix-wrong-smbd-max-read-write-size-check.patch
queue-5.15/ksmbd-replace-usage-of-found-with-dedicated-list-iterator-variable.patch
queue-5.15/ksmbd-add-support-for-surrogate-pair-conversion.patch
queue-5.15/ksmbd-reduce-server-smbdirect-max-send-receive-segment-sizes.patch
queue-5.15/ksmbd-fix-force-create-mode-and-force-directory-mode.patch
queue-5.15/ksmbd-remove-unneeded-mark_inode_dirty-in-set_info_sec.patch
queue-5.15/ksmbd-fix-potential-double-free-on-smb2_read_pipe-error-path.patch
queue-5.15/ksmbd-remove-unused-ksmbd_tree_conn_share-function.patch
queue-5.15/ksmbd-block-asynchronous-requests-when-making-a-delay-on-session-setup.patch
queue-5.15/ksmbd-call-putname-after-using-the-last-component.patch
queue-5.15/ksmbd-don-t-open-code-file_path.patch
queue-5.15/ksmbd-fix-passing-freed-memory-aux_payload_buf.patch
queue-5.15/ksmbd-fill-sids-in-smb_find_file_posix_info-response.patch
queue-5.15/ksmbd-don-t-open-code-pd.patch
queue-5.15/ksmbd-shorten-experimental-warning-on-loading-the-module.patch
queue-5.15/ksmbd-remove-filename-in-ksmbd_file.patch
queue-5.15/ksmbd-move-oplock-handling-after-unlock-parent-dir.patch
queue-5.15/ksmbd-fix-race-condition-between-tree-conn-lookup-and-disconnect.patch
queue-5.15/ksmbd-smbd-introduce-read-write-credits-for-rdma-read-write.patch
queue-5.15/ksmbd-fix-slab-out-of-bounds-in-init_smb2_rsp_hdr.patch
queue-5.15/ksmbd-fix-recursive-locking-in-vfs-helpers.patch
queue-5.15/ksmbd-fix-some-kernel-doc-comments.patch
queue-5.15/ksmbd-use-struct_size-helper-in-ksmbd_negotiate_smb_dialect.patch
queue-5.15/ksmbd-smbd-relax-the-count-of-sges-required.patch
queue-5.15/ksmbd-fix-wrong-error-response-status-by-using-set_smb2_rsp_status.patch
queue-5.15/ksmbd-fix-spelling-mistake-excceed-exceeded.patch
queue-5.15/ksmbd-fix-null-pointer-dereferences-in-ksmbd_update_fstate.patch
queue-5.15/ksmbd-fix-encryption-failure-issue-for-session-logoff-response.patch
queue-5.15/ksmbd-prevent-memory-leak-on-error-return.patch
queue-5.15/ksmbd-fix-racy-issue-from-using-d_parent-and-d_name.patch
queue-5.15/ksmbd-change-security-id-to-the-one-samba-used-for-posix-extension.patch
queue-5.15/ksmbd-handle-malformed-smb1-message.patch
queue-5.15/ksmbd-don-t-update-op_state-as-oplock_state_none-on-error.patch
queue-5.15/ksmbd-smbd-fix-connection-dropped-issue.patch
queue-5.15/ksmbd-fix-racy-issue-from-smb2-close-and-logoff-with-multichannel.patch
queue-5.15/ksmbd-change-the-return-value-of-ksmbd_vfs_query_maximal_access-to-void.patch
queue-5.15/ksmbd-fix-slub-overflow-in-ksmbd_decode_ntlmssp_auth_blob.patch
queue-5.15/ksmbd-replace-one-element-array-with-flexible-array-member.patch
queue-5.15/ksmbd-fix-uninitialized-pointer-read-in-ksmbd_vfs_rename.patch
queue-5.15/ksmbd-replace-one-element-arrays-with-flexible-array-members.patch
queue-5.15/ksmbd-fix-unsigned-expression-compared-with-zero.patch
queue-5.15/ksmbd-implements-sess-ksmbd_chann_list-as-xarray.patch
queue-5.15/ksmbd-set-file-permission-mode-to-match-samba-server-posix-extension-behavior.patch
queue-5.15/ksmbd-fix-wrong-interim-response-on-compound.patch
queue-5.15/ksmbd-return-invalid-parameter-error-response-if-smb2-request-is-invalid.patch
queue-5.15/ksmbd-smbd-validate-buffer-descriptor-structures.patch
queue-5.15/ksmbd-fix-missing-rdma-capable-flag-for-ipoib-device-in-ksmbd_rdma_capable_netdev.patch
queue-5.15/ksmbd-send-proper-error-response-in-smb2_tree_connect.patch
queue-5.15/ksmbd-set-negotiatecontextcount-once-instead-of-every-inc.patch
queue-5.15/ksmbd-fix-typo-syncronous-synchronous.patch
queue-5.15/ksmbd-validate-share-name-from-share-config-response.patch
queue-5.15/ksmbd-fix-possible-deadlock-in-smb2_open.patch
queue-5.15/ksmbd-fix-multiple-out-of-bounds-read-during-context-decoding.patch
queue-5.15/ksmbd-add-missing-calling-smb2_set_err_rsp-on-error.patch
queue-5.15/ksmbd-remove-unused-ksmbd_share_configs_cleanup-function.patch
queue-5.15/ksmbd-fix-out-of-bound-read-in-parse_lease_state.patch
queue-5.15/ksmbd-remove-duplicated-codes.patch
queue-5.15/ksmbd-remove-a-redundant-zeroing-of-memory.patch
queue-5.15/ksmbd-change-leasekey-data-type-to-u8-array.patch
queue-5.15/ksmbd-add-support-for-read-compound.patch
queue-5.15/ksmbd-fix-kernel-doc-comment-of-ksmbd_vfs_setxattr.patch
queue-5.15/ksmbd-remove-unused-compression-negotiate-ctx-packing.patch
queue-5.15/ksmbd-switch-to-use-kmemdup_nul-helper.patch
queue-5.15/ksmbd-fix-race-condition-from-parallel-smb2-logoff-requests.patch
queue-5.15/ksmbd-fix-out-of-bound-read-in-deassemble_neg_contexts.patch
queue-5.15/ksmbd-remove-unnecessary-generic_fillattr-in-smb2_open.patch
queue-5.15/ksmbd-avoid-duplicate-negotiate-ctx-offset-increments.patch
queue-5.15/ksmbd-remove-experimental-warning.patch
queue-5.15/ksmbd-return-a-literal-instead-of-err-in-ksmbd_vfs_kern_path_locked.patch
queue-5.15/ksmbd-smbd-change-prototypes-of-rdma-read-write-related-functions.patch
queue-5.15/ksmbd-fix-out-of-bounds-in-init_smb2_rsp_hdr.patch
queue-5.15/ksmbd-fix-possible-memory-leak-in-smb2_lock.patch
queue-5.15/ksmbd-remove-unused-field-in-ksmbd_user-struct.patch
queue-5.15/ksmbd-fix-one-kernel-doc-comment.patch
queue-5.15/ksmbd-no-need-to-wait-for-binded-connection-termination-at-logoff.patch
queue-5.15/ksmbd-fix-race-condition-with-fp.patch
queue-5.15/ksmbd-fix-wrong-signingkey-creation-when-encryption-is-aes256.patch
queue-5.15/ksmbd-update-kconfig-to-note-kerberos-support-and-fix-indentation.patch
queue-5.15/ksmbd-move-setting-smb2_flags_async_command-and-asyncid.patch
queue-5.15/smb3-fix-ksmbd-bigendian-bug-in-oplock-break-and-move-its-struct-to-smbfs_common.patch
queue-5.15/ksmbd-store-fids-as-opaque-u64-integers.patch
queue-5.15/ksmbd-delete-asynchronous-work-from-list.patch
queue-5.15/ksmbd-use-kvzalloc-instead-of-kvmalloc.patch
queue-5.15/ksmbd-smbd-change-the-return-value-of-get_sg_list.patch
queue-5.15/ksmbd-add-missing-compound-request-handing-in-some-commands.patch
queue-5.15/ksmbd-remove-unused-is_char_allowed-function.patch
queue-5.15/ksmbd-use-oid-registry-functions-to-decode-oids.patch
queue-5.15/ksmbd-fix-kernel-doc-comment-of-ksmbd_vfs_kern_path_locked.patch
queue-5.15/ksmbd-use-wait_event-instead-of-schedule_timeout.patch
queue-5.15/ksmbd-check-if-a-mount-point-is-crossed-during-path-lookup.patch
queue-5.15/ksmbd-replace-the-ternary-conditional-operator-with-min.patch
