From: Namjae Jeon linkinjeon@kernel.org
[ Upstream commit f6bd41280a44dcc2e0a25ed72617d25f586974a7 ]
Sangsoo reported that a DAC denial error occurred when accessing files through the ksmbd thread. This patch override fsids for smb2_query_info().
Reported-by: Sangsoo Lee constant.lee@samsung.com Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/server/smb2pdu.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index d97c7982bb3ee..d018148913615 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -5321,6 +5321,11 @@ int smb2_query_info(struct ksmbd_work *work)
ksmbd_debug(SMB, "GOT query info request\n");
+ if (ksmbd_override_fsids(work)) { + rc = -ENOMEM; + goto err_out; + } + switch (req->InfoType) { case SMB2_O_INFO_FILE: ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n"); @@ -5339,6 +5344,7 @@ int smb2_query_info(struct ksmbd_work *work) req->InfoType); rc = -EOPNOTSUPP; } + ksmbd_revert_fsids(work);
if (!rc) { rsp->StructureSize = cpu_to_le16(9); @@ -5348,6 +5354,7 @@ int smb2_query_info(struct ksmbd_work *work) le32_to_cpu(rsp->OutputBufferLength)); }
+err_out: if (rc < 0) { if (rc == -EACCES) rsp->hdr.Status = STATUS_ACCESS_DENIED;