--- /dev/null
+From 3320ba068198adc144c89d6661b805acce01735b Mon Sep 17 00:00:00 2001
+From: Gil Portnoy <dddhkts1@gmail.com>
+Date: Wed, 10 Jun 2026 20:07:04 +0900
+Subject: ksmbd: add a permission check for FSCTL_SET_ZERO_DATA
+
+From: Gil Portnoy <dddhkts1@gmail.com>
+
+commit 3320ba068198adc144c89d6661b805acce01735b upstream.
+
+FSCTL_SET_ZERO_DATA in smb2_ioctl() destroys file data via
+ksmbd_vfs_zero_data() -> vfs_fallocate(PUNCH_HOLE/ZERO_RANGE) after
+checking only the share-level KSMBD_TREE_CONN_FLAG_WRITABLE, with no
+per-handle access check. A handle opened with only FILE_WRITE_ATTRIBUTES
+still yields an FMODE_WRITE filp (FILE_WRITE_ATTRIBUTES is part of
+FILE_WRITE_DESIRE_ACCESS_LE, so smb2_create_open_flags() opens it
+O_WRONLY), so the vfs_fallocate FMODE_WRITE check does not stop it; only
+the missing fp->daccess gate would. Reproduced on mainline 7.1-rc7 with
+KASAN by an authenticated SMB client: a FILE_WRITE_ATTRIBUTES-only handle
+zeroed 4096 bytes of file data it had no FILE_WRITE_DATA right to
+(6/6; a FILE_READ_DATA-only handle was correctly denied).
+
+This is the unfixed sibling of commit cc57232cae23 ("ksmbd: fix FSCTL
+permission bypass by adding a permission check for FSCTL_SET_SPARSE").
+Because SET_ZERO_DATA writes data (not an attribute), require
+FILE_WRITE_DATA.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Gil Portnoy <dddhkts1@gmail.com>
+Acked-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -8407,6 +8407,12 @@ int smb2_ioctl(struct ksmbd_work *work)
+ goto out;
+ }
+
++ if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
++ ksmbd_fd_put(work, fp);
++ ret = -EACCES;
++ goto out;
++ }
++
+ ret = ksmbd_vfs_zero_data(work, fp, off, len);
+ ksmbd_fd_put(work, fp);
+ if (ret < 0)
--- /dev/null
+From 44df157a1183a7f746caa970c169255da5ac61f8 Mon Sep 17 00:00:00 2001
+From: Gil Portnoy <dddhkts1@gmail.com>
+Date: Tue, 9 Jun 2026 00:00:00 +0000
+Subject: ksmbd: add a WRITE_DAC/WRITE_OWNER check to SMB2 SET_INFO SECURITY
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From: Gil Portnoy <dddhkts1@gmail.com>
+
+commit 44df157a1183a7f746caa970c169255da5ac61f8 upstream.
+
+commit cc57232cae23 ("ksmbd: fix FSCTL permission bypass by adding a
+permission check for FSCTL_SET_SPARSE") added a fp->daccess gate to
+fsctl_set_sparse and noted that "similar handle-level checks exist in other
+functions but are missing here." The SMB2 SET_INFO SECURITY arm is one of
+the missing ones, and the most security-relevant: smb2_set_info_sec() calls
+set_info_sec() with no per-handle access check.
+
+set_info_sec() (fs/smb/server/smbacl.c) re-permissions the file: it
+rewrites owner/group/mode via notify_change(), rewrites the POSIX ACL via
+set_posix_acl(), and on KSMBD_SHARE_FLAG_ACL_XATTR shares removes and
+rewrites the Windows security descriptor via ksmbd_vfs_set_sd_xattr().
+Every other persistent-mutation arm of the sibling handler
+smb2_set_info_file() checks fp->daccess first (FILE_WRITE_DATA /
+FILE_DELETE / FILE_WRITE_EA / FILE_WRITE_ATTRIBUTES); the SECURITY arm —
+which mutates the access control itself — is the only one with no gate.
+
+A client can therefore open a handle with FILE_WRITE_ATTRIBUTES only (no
+FILE_WRITE_DAC / FILE_WRITE_OWNER) and use SMB2_SET_INFO with InfoType
+SMB2_O_INFO_SECURITY to rewrite the file's DACL and owner, granting itself
+access the handle's daccess never carried. Unlike the FSCTL data arms this
+is a metadata/xattr operation, so there is no FMODE_WRITE VFS backstop —
+the missing fp->daccess check is the entire gate.
+
+Setting a security descriptor is the WRITE_DAC / WRITE_OWNER operation, so
+require at least one of those on the handle before re-permissioning the
+file. -EACCES is mapped to STATUS_ACCESS_DENIED by smb2_set_info().
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Gil Portnoy <dddhkts1@gmail.com>
+Acked-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -6555,6 +6555,9 @@ static int smb2_set_info_sec(struct ksmb
+
+ fp->saccess |= FILE_SHARE_DELETE_LE;
+
++ if (!(fp->daccess & (FILE_WRITE_DAC_LE | FILE_WRITE_OWNER_LE)))
++ return -EACCES;
++
+ return set_info_sec(fp->conn, fp->tcon, &fp->filp->f_path, pntsd,
+ buf_len, false, true);
+ }
--- /dev/null
+From 13f3942f2bf45856bb751faed2f0c4618f41ca20 Mon Sep 17 00:00:00 2001
+From: Gil Portnoy <dddhkts1@gmail.com>
+Date: Wed, 10 Jun 2026 20:13:51 +0900
+Subject: ksmbd: add per-handle permission check to FILE_LINK_INFORMATION
+
+From: Gil Portnoy <dddhkts1@gmail.com>
+
+commit 13f3942f2bf45856bb751faed2f0c4618f41ca20 upstream.
+
+The FILE_LINK_INFORMATION arm of smb2_set_info_file() calls
+smb2_create_link() with no per-handle fp->daccess check. On the
+ReplaceIfExists path smb2_create_link() unlinks an existing file at the
+target name (ksmbd_vfs_remove_file) and creates a hardlink
+(ksmbd_vfs_link); neither helper checks daccess. A handle opened with
+FILE_READ_DATA only (no FILE_DELETE, no FILE_WRITE_DATA) can therefore
+delete an arbitrary file in the share and plant a hardlink over its name.
+
+The sibling delete/move arms in the same switch already gate:
+FILE_RENAME_INFORMATION and FILE_DISPOSITION_INFORMATION both require
+FILE_DELETE_LE; FILE_FULL_EA_INFORMATION requires FILE_WRITE_EA_LE. Gate
+the link arm the same way as its closest analogue (rename), since it
+mutates the namespace and, on replace, deletes an existing entry.
+
+This is a sibling of commit cc57232cae23 ("ksmbd: fix FSCTL permission
+bypass by adding a permission check for FSCTL_SET_SPARSE").
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Gil Portnoy <dddhkts1@gmail.com>
+Acked-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -6504,6 +6504,11 @@ static int smb2_set_info_file(struct ksm
+ }
+ case FILE_LINK_INFORMATION:
+ {
++ if (!(fp->daccess & FILE_DELETE_LE)) {
++ pr_err("no right to delete : 0x%x\n", fp->daccess);
++ return -EACCES;
++ }
++
+ if (buf_len < sizeof(struct smb2_file_link_info))
+ return -EINVAL;
+
--- /dev/null
+From 388e4139db27a9e3612c9d356b826f5b1ff6a9e3 Mon Sep 17 00:00:00 2001
+From: Gil Portnoy <dddhkts1@gmail.com>
+Date: Fri, 12 Jun 2026 07:15:38 +0900
+Subject: ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
+
+From: Gil Portnoy <dddhkts1@gmail.com>
+
+commit 388e4139db27a9e3612c9d356b826f5b1ff6a9e3 upstream.
+
+The FSCTL_DUPLICATE_EXTENTS_TO_FILE arm of smb2_ioctl() overwrites the
+destination file's data via vfs_clone_file_range() with neither the
+share-level KSMBD_TREE_CONN_FLAG_WRITABLE check nor a per-handle
+fp->daccess check that the other write-bearing arms carry. A client can
+overwrite destination data on a read-only share, or from a handle opened
+with only FILE_WRITE_ATTRIBUTES (which still yields an FMODE_WRITE filp).
+FILE_WRITE_ATTRIBUTES-only destination handle overwrote the file's data via
+the clone. Add both checks, matching the FSCTL_SET_SPARSE permission fix;
+require FILE_WRITE_DATA since this writes data.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Gil Portnoy <dddhkts1@gmail.com>
+Acked-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 11 +++++++++++
+ 1 file changed, 11 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -8482,6 +8482,17 @@ int smb2_ioctl(struct ksmbd_work *work)
+ goto dup_ext_out;
+ }
+
++ if (!test_tree_conn_flag(work->tcon,
++ KSMBD_TREE_CONN_FLAG_WRITABLE)) {
++ ret = -EACCES;
++ goto dup_ext_out;
++ }
++
++ if (!(fp_out->daccess & FILE_WRITE_DATA_LE)) {
++ ret = -EACCES;
++ goto dup_ext_out;
++ }
++
+ src_off = le64_to_cpu(dup_ext->SourceFileOffset);
+ dst_off = le64_to_cpu(dup_ext->TargetFileOffset);
+ length = le64_to_cpu(dup_ext->ByteCount);
--- /dev/null
+From 20c8442dc1003f9f7bb522d3dcd81d09ea59a79e Mon Sep 17 00:00:00 2001
+From: Gil Portnoy <dddhkts1@gmail.com>
+Date: Thu, 11 Jun 2026 22:59:51 +0900
+Subject: ksmbd: enforce FILE_READ_ATTRIBUTES on SMB_FIND_FILE_POSIX_INFORMATION
+
+From: Gil Portnoy <dddhkts1@gmail.com>
+
+commit 20c8442dc1003f9f7bb522d3dcd81d09ea59a79e upstream.
+
+find_file_posix_info() in smb2_query_info() returns file metadata (owner
+uid, group gid, mode, inode, size, allocation size, hard-link count and all
+four timestamps) but performs no per-handle access check. Every sibling
+query handler gates on the handle's granted access first --
+get_file_basic_info(), get_file_all_info(), get_file_network_open_info()
+and get_file_attribute_tag_info() all reject a handle lacking
+FILE_READ_ATTRIBUTES_LE with -EACCES. The POSIX handler is gated only by
+the connection-scoped tcon->posix_extensions flag, which is not a
+per-handle authorization, so a handle opened with only FILE_WRITE_DATA is
+correctly denied FileBasicInformation yet is allowed the strict-superset
+POSIX info. Mirror the FILE_READ_ATTRIBUTES_LE gate the sibling info
+handlers already use.
+
+Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
+Cc: stable@vger.kernel.org
+Signed-off-by: Gil Portnoy <dddhkts1@gmail.com>
+Acked-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -5290,6 +5290,12 @@ static int find_file_posix_info(struct s
+ int out_buf_len = sizeof(struct smb311_posix_qinfo) + 32;
+ int ret;
+
++ if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
++ pr_err("no right to read the attributes : 0x%x\n",
++ fp->daccess);
++ return -EACCES;
++ }
++
+ ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
+ AT_STATX_SYNC_AS_STAT);
+ if (ret)
--- /dev/null
+From d20d1c8ba5765d1d12eefc0aee6385ab3f240e1e Mon Sep 17 00:00:00 2001
+From: Davide Ornaghi <d.ornaghi97@gmail.com>
+Date: Sat, 6 Jun 2026 16:11:04 +0900
+Subject: ksmbd: fix UAF of struct file_lock in SMB2_LOCK deferred-lock cancellation
+
+From: Davide Ornaghi <d.ornaghi97@gmail.com>
+
+commit d20d1c8ba5765d1d12eefc0aee6385ab3f240e1e upstream.
+
+When a blocking byte-range lock request is deferred in the
+FILE_LOCK_DEFERRED path, ksmbd registers the asynchronous work into
+the connection's async_requests list via setup_async_work(). The cancel
+callback smb2_remove_blocked_lock() holds a reference to the flock.
+
+If the lock waiter is subsequently woken up but the work state is no
+longer KSMBD_WORK_ACTIVE (e.g., due to a concurrent cancellation), the
+cleanup path calls locks_free_lock(flock) without dequeuing the work from
+the async_requests list. Concurrently, smb2_cancel() walks the list
+under conn->request_lock and invokes the cancel callback, which then
+dereferences the already freed 'flock'. This leads to a slab-use-after-free
+inside __wake_up_common.
+
+Fix this by restructuring the cleanup logic after the worker returns
+from ksmbd_vfs_posix_lock_wait(). Move list_del(&smb_lock->llist) and
+release_async_work(work) to the top of the cleanup block. This guarantees
+that the async work is completely dequeued and serialized under
+conn->request_lock before locks_free_lock(flock) is called, rendering
+the flock unreachable for any concurrent smb2_cancel().
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Davide Ornaghi <d.ornaghi97@gmail.com>
+Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 34 ++++++++++++++++------------------
+ 1 file changed, 16 insertions(+), 18 deletions(-)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -7667,29 +7667,27 @@ skip:
+ list_del(&work->fp_entry);
+ spin_unlock(&fp->f_lock);
+
+- if (work->state != KSMBD_WORK_ACTIVE) {
+- list_del(&smb_lock->llist);
+- locks_free_lock(flock);
++ list_del(&smb_lock->llist);
++ release_async_work(work);
++
++ if (work->state == KSMBD_WORK_ACTIVE)
++ goto retry;
+
+- if (work->state == KSMBD_WORK_CANCELLED) {
+- rsp->hdr.Status =
+- STATUS_CANCELLED;
+- kfree(smb_lock);
+- smb2_send_interim_resp(work,
+- STATUS_CANCELLED);
+- work->send_no_response = 1;
+- goto out;
+- }
++ locks_free_lock(flock);
+
+- rsp->hdr.Status =
+- STATUS_RANGE_NOT_LOCKED;
++ if (work->state == KSMBD_WORK_CANCELLED) {
++ rsp->hdr.Status = STATUS_CANCELLED;
+ kfree(smb_lock);
+- goto out2;
++ smb2_send_interim_resp(work,
++ STATUS_CANCELLED);
++ work->send_no_response = 1;
++ goto out;
+ }
+
+- list_del(&smb_lock->llist);
+- release_async_work(work);
+- goto retry;
++ rsp->hdr.Status =
++ STATUS_RANGE_NOT_LOCKED;
++ kfree(smb_lock);
++ goto out2;
+ } else if (!rc) {
+ list_add(&smb_lock->llist, &rollback_list);
+ spin_lock(&work->conn->llist_lock);
--- /dev/null
+From cedff600f1642aa982178503552f0d007bc829c8 Mon Sep 17 00:00:00 2001
+From: Namjae Jeon <linkinjeon@kernel.org>
+Date: Sat, 13 Jun 2026 22:00:02 +0900
+Subject: ksmbd: require source read access for duplicate extents
+
+From: Namjae Jeon <linkinjeon@kernel.org>
+
+commit cedff600f1642aa982178503552f0d007bc829c8 upstream.
+
+FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to
+vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB
+access mask granted to the source handle. A handle opened with attribute
+access can consequently be used to copy file contents into an
+attacker-readable destination.
+
+Require FILE_READ_DATA on the source handle before either VFS operation,
+matching other ksmbd data-copy paths.
+
+Cc: stable@vger.kernel.org
+Reported-by: Musaab Khan <musaab.khan@protonmail.com>
+Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -8500,6 +8500,10 @@ int smb2_ioctl(struct ksmbd_work *work)
+ ret = -EACCES;
+ goto dup_ext_out;
+ }
++ if (!(fp_in->daccess & FILE_READ_DATA_LE)) {
++ ret = -EACCES;
++ goto dup_ext_out;
++ }
+
+ src_off = le64_to_cpu(dup_ext->SourceFileOffset);
+ dst_off = le64_to_cpu(dup_ext->TargetFileOffset);
--- /dev/null
+From b383bcad3d2fe634b26efbce53e22bbb5753a520 Mon Sep 17 00:00:00 2001
+From: Namjae Jeon <linkinjeon@kernel.org>
+Date: Sat, 13 Jun 2026 22:00:01 +0900
+Subject: ksmbd: run set info with opener credentials
+
+From: Namjae Jeon <linkinjeon@kernel.org>
+
+commit b383bcad3d2fe634b26efbce53e22bbb5753a520 upstream.
+
+SMB2 SET_INFO handlers call path-based VFS helpers after checking the
+access mask granted to the SMB handle. Those helpers perform their owner,
+inode permission and LSM checks using the current ksmbd worker credentials.
+
+Run the complete SET_INFO dispatch with the credentials captured when the
+handle was opened. This also removes the separate security information
+credential setup and keeps all SET_INFO classes under one credential scope.
+
+Direct override_creds() is used because it can nest with the request
+credential overrides already used by rename and link helpers.
+
+Cc: stable@vger.kernel.org
+Reported-by: Musaab Khan <musaab.khan@protonmail.com>
+Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 8 +++-----
+ 1 file changed, 3 insertions(+), 5 deletions(-)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -6570,6 +6570,7 @@ static int smb2_set_info_sec(struct ksmb
+ */
+ int smb2_set_info(struct ksmbd_work *work)
+ {
++ const struct cred *saved_cred;
+ struct smb2_set_info_req *req;
+ struct smb2_set_info_rsp *rsp;
+ struct ksmbd_file *fp = NULL;
+@@ -6611,6 +6612,7 @@ int smb2_set_info(struct ksmbd_work *wor
+ goto err_out;
+ }
+
++ saved_cred = override_creds(fp->filp->f_cred);
+ switch (req->InfoType) {
+ case SMB2_O_INFO_FILE:
+ ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
+@@ -6618,19 +6620,15 @@ int smb2_set_info(struct ksmbd_work *wor
+ break;
+ case SMB2_O_INFO_SECURITY:
+ ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
+- if (ksmbd_override_fsids(work)) {
+- rc = -ENOMEM;
+- goto err_out;
+- }
+ rc = smb2_set_info_sec(fp,
+ le32_to_cpu(req->AdditionalInformation),
+ (char *)req + le16_to_cpu(req->BufferOffset),
+ le32_to_cpu(req->BufferLength));
+- ksmbd_revert_fsids(work);
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ }
++ revert_creds(saved_cred);
+
+ if (rc < 0)
+ goto err_out;
--- /dev/null
+From be6d26bf27499977c746abc163659915082348d8 Mon Sep 17 00:00:00 2001
+From: Namjae Jeon <linkinjeon@kernel.org>
+Date: Fri, 12 Jun 2026 08:00:00 +0900
+Subject: ksmbd: serialize QUERY_DIRECTORY requests per file
+
+From: Namjae Jeon <linkinjeon@kernel.org>
+
+commit be6d26bf27499977c746abc163659915082348d8 upstream.
+
+smb2_query_dir() stores a pointer to its stack-allocated private data in
+the ksmbd_file readdir_data. Concurrent QUERY_DIRECTORY requests using the
+same file handle can overwrite this pointer while an iterate_dir() callback
+is still using it, resulting in a stack use-after-free.
+
+Add a per-file mutex and hold it while accessing the shared directory
+enumeration state. The lock covers scan restart, dot entry state,
+readdir_data setup and iteration, and response construction. This prevents
+another request from replacing readdir_data.private before the current
+request has finished using it and also serializes the shared file position.
+
+Cc: stable@vger.kernel.org
+Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-30527
+Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/smb2pdu.c | 4 ++++
+ fs/smb/server/vfs_cache.c | 1 +
+ fs/smb/server/vfs_cache.h | 2 ++
+ 3 files changed, 7 insertions(+)
+
+--- a/fs/smb/server/smb2pdu.c
++++ b/fs/smb/server/smb2pdu.c
+@@ -4445,6 +4445,8 @@ int smb2_query_dir(struct ksmbd_work *wo
+ ksmbd_debug(SMB, "Search pattern is %s\n", srch_ptr);
+ }
+
++ mutex_lock(&dir_fp->readdir_lock);
++
+ if (srch_flag & SMB2_REOPEN || srch_flag & SMB2_RESTART_SCANS) {
+ ksmbd_debug(SMB, "Restart directory scan\n");
+ generic_file_llseek(dir_fp->filp, 0, SEEK_SET);
+@@ -4549,6 +4551,7 @@ no_buf_len:
+ goto err_out;
+ }
+
++ mutex_unlock(&dir_fp->readdir_lock);
+ kfree(srch_ptr);
+ ksmbd_fd_put(work, dir_fp);
+ ksmbd_revert_fsids(work);
+@@ -4556,6 +4559,7 @@ no_buf_len:
+
+ err_out:
+ pr_err("error while processing smb2 query dir rc = %d\n", rc);
++ mutex_unlock(&dir_fp->readdir_lock);
+ kfree(srch_ptr);
+
+ err_out2:
+--- a/fs/smb/server/vfs_cache.c
++++ b/fs/smb/server/vfs_cache.c
+@@ -686,6 +686,7 @@ struct ksmbd_file *ksmbd_open_fd(struct
+ INIT_LIST_HEAD(&fp->node);
+ INIT_LIST_HEAD(&fp->lock_list);
+ spin_lock_init(&fp->f_lock);
++ mutex_init(&fp->readdir_lock);
+ atomic_set(&fp->refcount, 1);
+
+ fp->filp = filp;
+--- a/fs/smb/server/vfs_cache.h
++++ b/fs/smb/server/vfs_cache.h
+@@ -8,6 +8,7 @@
+
+ #include <linux/file.h>
+ #include <linux/fs.h>
++#include <linux/mutex.h>
+ #include <linux/rwsem.h>
+ #include <linux/spinlock.h>
+ #include <linux/idr.h>
+@@ -112,6 +113,7 @@ struct ksmbd_file {
+
+ /* if ls is happening on directory, below is valid*/
+ struct ksmbd_readdir_data readdir_data;
++ struct mutex readdir_lock;
+ int dot_dotdot[2];
+ unsigned int f_state;
+ bool reserve_lease_break;
--- /dev/null
+From 52e2f21911158ec961cd5aae19c56460db382af0 Mon Sep 17 00:00:00 2001
+From: Namjae Jeon <linkinjeon@kernel.org>
+Date: Sat, 13 Jun 2026 22:00:00 +0900
+Subject: ksmbd: use opener credentials for delete-on-close
+
+From: Namjae Jeon <linkinjeon@kernel.org>
+
+commit 52e2f21911158ec961cd5aae19c56460db382af0 upstream.
+
+Delete-on-close can be completed by deferred or durable handle teardown,
+where no request work is available. Both the base-file unlink and the ADS
+xattr removal consequently run with the ksmbd worker credentials and can
+bypass filesystem permission checks.
+
+Run both operations with the credentials captured in struct file when the
+handle was opened. This preserves the authenticated user's fsuid, fsgid,
+supplementary groups and capability restrictions at final close.
+
+Cc: stable@vger.kernel.org
+Reported-by: Musaab Khan <musaab.khan@protonmail.com>
+Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/server/vfs.c | 7 +++++--
+ fs/smb/server/vfs_cache.c | 4 ++++
+ 2 files changed, 9 insertions(+), 2 deletions(-)
+
+--- a/fs/smb/server/vfs.c
++++ b/fs/smb/server/vfs.c
+@@ -1084,13 +1084,15 @@ int ksmbd_vfs_remove_xattr(struct mnt_id
+
+ int ksmbd_vfs_unlink(struct file *filp)
+ {
++ const struct cred *saved_cred;
+ int err = 0;
+ struct dentry *dir, *dentry = filp->f_path.dentry;
+ struct mnt_idmap *idmap = file_mnt_idmap(filp);
+
++ saved_cred = override_creds(filp->f_cred);
+ err = mnt_want_write(filp->f_path.mnt);
+ if (err)
+- return err;
++ goto out_revert;
+
+ dir = dget_parent(dentry);
+ err = ksmbd_vfs_lock_parent(dir, dentry);
+@@ -1110,7 +1112,8 @@ int ksmbd_vfs_unlink(struct file *filp)
+ out:
+ dput(dir);
+ mnt_drop_write(filp->f_path.mnt);
+-
++out_revert:
++ revert_creds(saved_cred);
+ return err;
+ }
+
+--- a/fs/smb/server/vfs_cache.c
++++ b/fs/smb/server/vfs_cache.c
+@@ -292,10 +292,14 @@ static void __ksmbd_inode_close(struct k
+ up_write(&ci->m_lock);
+
+ if (remove_stream_xattr) {
++ const struct cred *saved_cred;
++
++ saved_cred = override_creds(filp->f_cred);
+ err = ksmbd_vfs_remove_xattr(file_mnt_idmap(filp),
+ &filp->f_path,
+ fp->stream.name,
+ true);
++ revert_creds(saved_cred);
+ if (err)
+ pr_err("remove xattr failed : %s\n",
+ fp->stream.name);
fs-ntfs3-zero-fill-folios-beyond-i_valid-in-ntfs_rea.patch
fs-ntfs3-fix-missing-run-load-for-vcn0-in-attr_data_.patch
coresight-ultrasoc-smb-fix-oob-write-in-smb_sync_perf_buffer.patch
+smb-client-fix-error-code-in-smb2_aead_req_alloc.patch
+ksmbd-add-permission-checks-for-fsctl_duplicate_extents_to_file.patch
+ksmbd-add-a-permission-check-for-fsctl_set_zero_data.patch
+ksmbd-serialize-query_directory-requests-per-file.patch
+ksmbd-fix-uaf-of-struct-file_lock-in-smb2_lock-deferred-lock-cancellation.patch
+ksmbd-require-source-read-access-for-duplicate-extents.patch
+ksmbd-add-a-write_dac-write_owner-check-to-smb2-set_info-security.patch
+ksmbd-run-set-info-with-opener-credentials.patch
+ksmbd-enforce-file_read_attributes-on-smb_find_file_posix_information.patch
+ksmbd-add-per-handle-permission-check-to-file_link_information.patch
+ksmbd-use-opener-credentials-for-delete-on-close.patch
+smb-client-fix-query-directory-replay-double-free.patch
+smb-client-fix-query_info-replay-double-free.patch
+smb-client-fix-double-free-in-smb2_ioctl-replay.patch
+smb-client-fix-change-notify-replay-double-free.patch
+smb-client-fix-double-free-in-smb2_flush-replay.patch
+smb-client-fix-double-free-in-smb2_open-replay.patch
+smb-client-fix-double-free-in-smb2_close-replay.patch
+smb-client-fix-next-buffer-leak-in-receive_encrypted_standard.patch
+smb-client-use-unaligned-reads-in-parse_posix_ctxt.patch
+smb-client-harden-posix-sid-length-parsing.patch
+smb-client-mask-server-provided-mode-to-07777-in-modefromsid.patch
--- /dev/null
+From 145f820dcbb2cced374f2532f8a61a44dce4a615 Mon Sep 17 00:00:00 2001
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+Date: Thu, 18 Jun 2026 17:34:37 -0300
+Subject: smb: client: fix change notify replay double-free
+
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+
+commit 145f820dcbb2cced374f2532f8a61a44dce4a615 upstream.
+
+A response-bearing attempt can return a replayable error and free its
+response buffer. If SMB2_notify_init() fails before the next send, cleanup
+retains the previous buffer type and frees that response again.
+
+Reset response bookkeeping before each attempt to prevent the stale free.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -4024,6 +4024,8 @@ SMB2_change_notify(const unsigned int xi
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ server = cifs_pick_channel(ses);
+
--- /dev/null
+From f96e1cdcb63ed3321142ff2fcdf784e32cda8fee Mon Sep 17 00:00:00 2001
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+Date: Thu, 18 Jun 2026 17:34:35 -0300
+Subject: smb: client: fix double-free in SMB2_close() replay
+
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+
+commit f96e1cdcb63ed3321142ff2fcdf784e32cda8fee upstream.
+
+A response-bearing attempt can return a replayable error and free its
+response buffer. If SMB2_close_init() fails before the next send, cleanup
+retains the previous buffer type and frees that response again.
+
+Reset response bookkeeping before each attempt to prevent the stale free.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -3629,6 +3629,8 @@ __SMB2_close(const unsigned int xid, str
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ query_attrs = false;
+ server = cifs_pick_channel(ses);
--- /dev/null
+From 4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a Mon Sep 17 00:00:00 2001
+From: Zhao Zhang <zzhan461@ucr.edu>
+Date: Thu, 18 Jun 2026 23:28:05 +0800
+Subject: smb: client: fix double-free in SMB2_flush() replay
+
+From: Zhao Zhang <zzhan461@ucr.edu>
+
+commit 4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a upstream.
+
+SMB2_flush() keeps its response buffer bookkeeping across replay
+attempts. If a replayable flush response is received and the retry then
+fails before cifs_send_recv() stores a replacement response, flush_exit
+will free the stale response pointer a second time.
+
+Reinitialize resp_buftype and rsp_iov at the top of the replay loop so
+cleanup only acts on response state produced by the current attempt.
+This fixes a double-free without changing replay handling for successful
+requests.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Zhengchuan Liang <zcliangcn@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Assisted-by: Codex:GPT-5.4
+Acked-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Zhao Zhang <zzhan461@ucr.edu>
+Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -4350,6 +4350,8 @@ SMB2_flush(const unsigned int xid, struc
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ server = cifs_pick_channel(ses);
+
--- /dev/null
+From f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9 Mon Sep 17 00:00:00 2001
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+Date: Thu, 18 Jun 2026 17:34:34 -0300
+Subject: smb: client: fix double-free in SMB2_ioctl() replay
+
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+
+commit f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9 upstream.
+
+A response-bearing attempt can return a replayable error and free its
+response buffer. If SMB2_ioctl_init() fails before the next send, cleanup
+retains the previous buffer type and frees that response again.
+
+Reset response bookkeeping before each attempt to prevent the stale free.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -3437,6 +3437,8 @@ SMB2_ioctl(const unsigned int xid, struc
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ server = cifs_pick_channel(ses);
+
--- /dev/null
+From b55e182f2324bc6a604c21a47aa6c448f719a532 Mon Sep 17 00:00:00 2001
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+Date: Thu, 18 Jun 2026 17:34:33 -0300
+Subject: smb: client: fix double-free in SMB2_open() replay
+
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+
+commit b55e182f2324bc6a604c21a47aa6c448f719a532 upstream.
+
+A response-bearing attempt can return a replayable error and free its
+response buffer. If SMB2_open_init() fails before the next send, cleanup
+retains the previous buffer type and frees that response again.
+
+Reset response bookkeeping before each attempt to prevent the stale free.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -3208,6 +3208,8 @@ SMB2_open(const unsigned int xid, struct
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ server = cifs_pick_channel(ses);
+ oparms->replay = !!(retries);
--- /dev/null
+From 61f28012e5650c619223decdb7970e0d3162e949 Mon Sep 17 00:00:00 2001
+From: Dan Carpenter <error27@gmail.com>
+Date: Thu, 11 Jun 2026 10:35:28 +0300
+Subject: smb/client: Fix error code in smb2_aead_req_alloc()
+
+From: Dan Carpenter <error27@gmail.com>
+
+commit 61f28012e5650c619223decdb7970e0d3162e949 upstream.
+
+The "*num_sgs" variable is a u32 so "ERR_PTR(*num_sgs)" doesn't work.
+We would have to do something similar to the previous line where it's
+cast to int and then long. However, it's simpler to store the return in
+an int ret variable.
+
+This bug would eventually result in a crash when dereference the invalid
+error pointer.
+
+Fixes: d08089f649a0 ("cifs: Change the I/O paths to use an iterator rather than a page list")
+Cc: stable@kernel.org
+Signed-off-by: Dan Carpenter <error27@gmail.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2ops.c | 8 +++++---
+ 1 file changed, 5 insertions(+), 3 deletions(-)
+
+--- a/fs/smb/client/smb2ops.c
++++ b/fs/smb/client/smb2ops.c
+@@ -4182,11 +4182,13 @@ static void *smb2_aead_req_alloc(struct
+ unsigned int req_size = sizeof(**req) + crypto_aead_reqsize(tfm);
+ unsigned int iv_size = crypto_aead_ivsize(tfm);
+ unsigned int len;
++ int ret;
+ u8 *p;
+
+- *num_sgs = cifs_get_num_sgs(rqst, num_rqst, sig);
+- if (IS_ERR_VALUE((long)(int)*num_sgs))
+- return ERR_PTR(*num_sgs);
++ ret = cifs_get_num_sgs(rqst, num_rqst, sig);
++ if (ret < 0)
++ return ERR_PTR(ret);
++ *num_sgs = ret;
+
+ len = iv_size;
+ len += crypto_aead_alignmask(tfm) & ~(crypto_tfm_ctx_alignment() - 1);
--- /dev/null
+From 1c6267a1d5cf4c73b656f8181b310cbbb3e4767b Mon Sep 17 00:00:00 2001
+From: Haoxiang Li <haoxiang_li2024@163.com>
+Date: Tue, 23 Jun 2026 09:45:38 +0800
+Subject: smb: client: Fix next buffer leak in receive_encrypted_standard()
+
+From: Haoxiang Li <haoxiang_li2024@163.com>
+
+commit 1c6267a1d5cf4c73b656f8181b310cbbb3e4767b upstream.
+
+receive_encrypted_standard() allocates next_buffer before checking
+whether the number of compound PDUs already reached MAX_COMPOUND. If
+the limit check fails, the function returns immediately and the newly
+allocated next_buffer is not assigned to server->smallbuf/server->bigbuf,
+making it leaked.
+
+Move the MAX_COMPOUND check before allocating next_buffer.
+
+Fixes: b24df3e30cbf ("cifs: update receive_encrypted_standard to handle compounded responses")
+Cc: stable@vger.kernel.org
+Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2ops.c | 10 ++++++----
+ 1 file changed, 6 insertions(+), 4 deletions(-)
+
+--- a/fs/smb/client/smb2ops.c
++++ b/fs/smb/client/smb2ops.c
+@@ -4942,6 +4942,12 @@ receive_encrypted_standard(struct TCP_Se
+ one_more:
+ shdr = (struct smb2_hdr *)buf;
+ next_cmd = le32_to_cpu(shdr->NextCommand);
++
++ if (*num_mids >= MAX_COMPOUND) {
++ cifs_server_dbg(VFS, "too many PDUs in compound\n");
++ return -1;
++ }
++
+ if (next_cmd) {
+ if (WARN_ON_ONCE(next_cmd > pdu_length))
+ return -1;
+@@ -4965,10 +4971,6 @@ one_more:
+ mid_entry->resp_buf_size = server->pdu_size;
+ }
+
+- if (*num_mids >= MAX_COMPOUND) {
+- cifs_server_dbg(VFS, "too many PDUs in compound\n");
+- return -1;
+- }
+ bufs[*num_mids] = buf;
+ mids[(*num_mids)++] = mid_entry;
+
--- /dev/null
+From 9647492b5e41954be59d5157eddbcd4cdc1656f7 Mon Sep 17 00:00:00 2001
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+Date: Thu, 18 Jun 2026 17:34:38 -0300
+Subject: smb: client: fix query directory replay double-free
+
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+
+commit 9647492b5e41954be59d5157eddbcd4cdc1656f7 upstream.
+
+A response-bearing attempt can return a replayable error and free its
+response buffer. If SMB2_query_directory_init() fails before the next send,
+cleanup retains the previous buffer type and frees that response again.
+
+Reset response bookkeeping before each attempt to prevent the stale free.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -5814,6 +5814,8 @@ SMB311_posix_qfs_info(const unsigned int
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ server = cifs_pick_channel(ses);
+
--- /dev/null
+From 2a88561d66eb855813cf004a0abe648bbb17de5e Mon Sep 17 00:00:00 2001
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+Date: Thu, 18 Jun 2026 17:34:36 -0300
+Subject: smb: client: fix query_info() replay double-free
+
+From: Henrique Carvalho <henrique.carvalho@suse.com>
+
+commit 2a88561d66eb855813cf004a0abe648bbb17de5e upstream.
+
+A response-bearing attempt can return a replayable error and free its
+response buffer. If SMB2_query_info_init() fails before the next send,
+cleanup retains the previous buffer type and frees that response again.
+
+Reset response bookkeeping before each attempt to prevent the stale free.
+
+Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
+Cc: stable@vger.kernel.org
+Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -3833,6 +3833,8 @@ query_info(const unsigned int xid, struc
+
+ replay_again:
+ /* reinitialize for possible replay */
++ resp_buftype = CIFS_NO_BUFFER;
++ memset(&rsp_iov, 0, sizeof(rsp_iov));
+ flags = 0;
+ allocated = false;
+ server = cifs_pick_channel(ses);
--- /dev/null
+From 7ad2bcf2441430bb2e918fb3ef9a90d775a6e422 Mon Sep 17 00:00:00 2001
+From: Zihan Xi <xizh2024@lzu.edu.cn>
+Date: Sun, 28 Jun 2026 17:19:24 +0800
+Subject: smb: client: harden POSIX SID length parsing
+
+From: Zihan Xi <xizh2024@lzu.edu.cn>
+
+commit 7ad2bcf2441430bb2e918fb3ef9a90d775a6e422 upstream.
+
+posix_info_sid_size() reads sid[1] to obtain the subauthority count,
+but its existing boundary check still accepts buffers with only one
+remaining byte. Require two bytes before reading sid[1] so all client
+paths that reuse the helper reject truncated POSIX SIDs safely.
+
+Fixes: 349e13ad30b4 ("cifs: add smb2 POSIX info level")
+Cc: stable@vger.kernel.org
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Assisted-by: Codex:gpt-5.4
+Signed-off-by: Zihan Xi <xizh2024@lzu.edu.cn>
+Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -5130,7 +5130,7 @@ int posix_info_sid_size(const void *beg,
+ size_t subauth;
+ int total;
+
+- if (beg + 1 > end)
++ if (beg + 2 > end)
+ return -1;
+
+ subauth = *(u8 *)(beg+1);
--- /dev/null
+From e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 Mon Sep 17 00:00:00 2001
+From: Norbert Manthey <nmanthey@amazon.de>
+Date: Thu, 9 Jul 2026 15:54:39 +0000
+Subject: smb: client: mask server-provided mode to 07777 in modefromsid
+
+From: Norbert Manthey <nmanthey@amazon.de>
+
+commit e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 upstream.
+
+When modefromsid is active, parse_dacl() applies the server-provided
+sub_auth[2] value from the NFS mode SID to cf_mode without masking to
+07777. Apply the correct masking, same as in the read path.
+
+Fixes: e2f8fbfb8d09c ("cifs: get mode bits from special sid on stat")
+Signed-off-by: Norbert Manthey <nmanthey@amazon.de>
+Assisted-by: Kiro:claude-opus-4.6
+Cc: stable@vger.kernel.org
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/cifsacl.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/fs/smb/client/cifsacl.c
++++ b/fs/smb/client/cifsacl.c
+@@ -890,7 +890,7 @@ static void parse_dacl(struct smb_acl *p
+ */
+ fattr->cf_mode &= ~07777;
+ fattr->cf_mode |=
+- le32_to_cpu(ppace[i]->sid.sub_auth[2]);
++ le32_to_cpu(ppace[i]->sid.sub_auth[2]) & 07777;
+ break;
+ } else {
+ if (compare_sids(&(ppace[i]->sid), pownersid) == 0) {
--- /dev/null
+From b86467cd2691192ad4809a5a6e922fc24b8e9839 Mon Sep 17 00:00:00 2001
+From: Zihan Xi <xizh2024@lzu.edu.cn>
+Date: Wed, 1 Jul 2026 18:23:21 +0800
+Subject: smb: client: use unaligned reads in parse_posix_ctxt()
+
+From: Zihan Xi <xizh2024@lzu.edu.cn>
+
+commit b86467cd2691192ad4809a5a6e922fc24b8e9839 upstream.
+
+The server controls create-context DataOffset, so the POSIX context data
+pointer may be misaligned on strict-alignment architectures. Use
+get_unaligned_le32() when reading nlink, reparse_tag, and mode.
+
+Fixes: 69dda3059e7a ("cifs: add SMB2_open() arg to return POSIX data")
+Cc: stable@vger.kernel.org
+Signed-off-by: Zihan Xi <xizh2024@lzu.edu.cn>
+Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/smb2pdu.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+--- a/fs/smb/client/smb2pdu.c
++++ b/fs/smb/client/smb2pdu.c
+@@ -2307,9 +2307,9 @@ parse_posix_ctxt(struct create_context *
+
+ memset(posix, 0, sizeof(*posix));
+
+- posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
+- posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
+- posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
++ posix->nlink = get_unaligned_le32(beg);
++ posix->reparse_tag = get_unaligned_le32(beg + 4);
++ posix->mode = get_unaligned_le32(beg + 8);
+
+ sid = beg + 12;
+ sid_len = posix_info_sid_size(sid, end);
projects / thirdparty / kernel / stable-queue.git / commitdiff
