From: Steve French <stfrench@microsoft.com>
Date: Sun, 24 Feb 2019 17:56:33 -0600
Subject: [PATCH] smb3: Update POSIX negotiate context with POSIX ctxt GUID
Git-commit: 0d481325a9e5e3a31bf83bfcd3690a7a7152ece1
Patch-mainline: v5.1-rc1
References: bsc#1144333

POSIX negotiate context now includes the GUID specifying
which POSIX open context we support.

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
 fs/cifs/smb2pdu.c | 17 +++++++++++++++++
 fs/cifs/smb2pdu.h |  4 ++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 49c2843b1bcf..64e172633bc4 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -490,6 +490,23 @@ build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 {
 	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
+	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
+	pneg_ctxt->Name[0] = 0x93;
+	pneg_ctxt->Name[1] = 0xAD;
+	pneg_ctxt->Name[2] = 0x25;
+	pneg_ctxt->Name[3] = 0x50;
+	pneg_ctxt->Name[4] = 0x9C;
+	pneg_ctxt->Name[5] = 0xB4;
+	pneg_ctxt->Name[6] = 0x11;
+	pneg_ctxt->Name[7] = 0xE7;
+	pneg_ctxt->Name[8] = 0xB4;
+	pneg_ctxt->Name[9] = 0x23;
+	pneg_ctxt->Name[10] = 0x83;
+	pneg_ctxt->Name[11] = 0xDE;
+	pneg_ctxt->Name[12] = 0x96;
+	pneg_ctxt->Name[13] = 0x8B;
+	pneg_ctxt->Name[14] = 0xCD;
+	pneg_ctxt->Name[15] = 0x7C;
 }
 
 static void
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 538e2299805f..0bd4d4802701 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -288,12 +288,12 @@ struct smb2_encryption_neg_context {
 	__le16	Ciphers[1]; /* Ciphers[0] since only one used now */
 } __packed;
 
-#define POSIX_CTXT_DATA_LEN	8
+#define POSIX_CTXT_DATA_LEN	16
 struct smb2_posix_neg_context {
 	__le16	ContextType; /* 0x100 */
 	__le16	DataLength;
 	__le32	Reserved;
-	__le64	Reserved1; /* In case needed for future (eg version or caps) */
+	__u8	Name[16]; /* POSIX ctxt GUID 93AD25509CB411E7B42383DE968BCD7C */
 } __packed;
 
 struct smb2_negotiate_rsp {
-- 
2.16.4