linux-kernel - [PATCH v2 13/16] cifs: Fix the smbd

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Message-ID: <20250625164213.1408754-14-dhowells@redhat.com>
Date: Wed, 25 Jun 2025 17:42:08 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>,
	Steve French <sfrench@...ba.org>
Cc: David Howells <dhowells@...hat.com>,
	Paulo Alcantara <pc@...guebit.com>,
	netfs@...ts.linux.dev,
	linux-afs@...ts.infradead.org,
	linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	ceph-devel@...r.kernel.org,
	v9fs@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stefan Metzmacher <metze@...ba.org>,
	Steve French <stfrench@...rosoft.com>
Subject: [PATCH v2 13/16] cifs: Fix the smbd_reponse slab to allow usercopy

The handling of received data in the smbdirect client code involves using
copy_to_iter() to copy data from the smbd_reponse struct's packet trailer
to a folioq buffer provided by netfslib that encapsulates a chunk of
pagecache.

If, however, CONFIG_HARDENED_USERCOPY=y, this will result in the checks
then performed in copy_to_iter() oopsing with something like the following:

 CIFS: Attempting to mount //172.31.9.1/test
 CIFS: VFS: RDMA transport established
 usercopy: Kernel memory exposure attempt detected from SLUB object 'smbd_response_0000000091e24ea1' (offset 81, size 63)!
 ------------[ cut here ]------------
 kernel BUG at mm/usercopy.c:102!
 ...
 RIP: 0010:usercopy_abort+0x6c/0x80
 ...
 Call Trace:
  <TASK>
  __check_heap_object+0xe3/0x120
  __check_object_size+0x4dc/0x6d0
  smbd_recv+0x77f/0xfe0 [cifs]
  cifs_readv_from_socket+0x276/0x8f0 [cifs]
  cifs_read_from_socket+0xcd/0x120 [cifs]
  cifs_demultiplex_thread+0x7e9/0x2d50 [cifs]
  kthread+0x396/0x830
  ret_from_fork+0x2b8/0x3b0
  ret_from_fork_asm+0x1a/0x30

The problem is that the smbd_response slab's packet field isn't marked as
being permitted for usercopy.

Fix this by passing parameters to kmem_slab_create() to indicate that
copy_to_iter() is permitted from the packet region of the smbd_response
slab objects, less the header space.

Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading")
Reported-by: Stefan Metzmacher <metze@...ba.org>
Link: https://lore.kernel.org/r/acb7f612-df26-4e2a-a35d-7cd040f513e1@samba.org/
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Stefan Metzmacher <metze@...ba.org>
Tested-by: Stefan Metzmacher <metze@...ba.org>
cc: Steve French <stfrench@...rosoft.com>
cc: Paulo Alcantara <pc@...guebit.com>
cc: linux-cifs@...r.kernel.org
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
---
 fs/smb/client/smbdirect.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c
index 5fa46b2e682c..5ac007a10a53 100644
--- a/fs/smb/client/smbdirect.c
+++ b/fs/smb/client/smbdirect.c
@@ -1475,6 +1475,9 @@ static int allocate_caches_and_workqueue(struct smbd_connection *info)
 	char name[MAX_NAME_LEN];
 	int rc;
 
+	if (WARN_ON_ONCE(sp->max_recv_size < sizeof(struct smbdirect_data_transfer)))
+		return -ENOMEM;
+
 	scnprintf(name, MAX_NAME_LEN, "smbd_request_%p", info);
 	info->request_cache =
 		kmem_cache_create(
@@ -1492,12 +1495,17 @@ static int allocate_caches_and_workqueue(struct smbd_connection *info)
 		goto out1;
 
 	scnprintf(name, MAX_NAME_LEN, "smbd_response_%p", info);
+
+	struct kmem_cache_args response_args = {
+		.align		= __alignof__(struct smbd_response),
+		.useroffset	= (offsetof(struct smbd_response, packet) +
+				   sizeof(struct smbdirect_data_transfer)),
+		.usersize	= sp->max_recv_size - sizeof(struct smbdirect_data_transfer),
+	};
 	info->response_cache =
-		kmem_cache_create(
-			name,
-			sizeof(struct smbd_response) +
-				sp->max_recv_size,
-			0, SLAB_HWCACHE_ALIGN, NULL);
+		kmem_cache_create(name,
+				  sizeof(struct smbd_response) + sp->max_recv_size,
+				  &response_args, SLAB_HWCACHE_ALIGN);
 	if (!info->response_cache)
 		goto out2;