linux-hardening - [PATCH v2] ksmbd: Replace one-element arrays with flexible-array members

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Message-ID: <20240816173338.151113-2-thorsten.blum@toblux.com>
Date: Fri, 16 Aug 2024 19:33:39 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: gustavo@...eddedor.com,
	linkinjeon@...nel.org,
	sfrench@...ba.org,
	senozhatsky@...omium.org,
	tom@...pey.com
Cc: linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH v2] ksmbd: Replace one-element arrays with flexible-array members

Replace the deprecated one-element arrays with flexible-array members
in the structs filesystem_attribute_info and filesystem_device_info.

There are no binary differences after this conversion.

Link: https://github.com/KSPP/linux/issues/79
Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
Changes in v2:
- Take struct size changes into account and do not subtract 2 additional
  bytes after feedback from Gustavo A. R. Silva
- Compare the binaries before and after the conversion and add a note
  that there are no differences
- Link to v1: https://lore.kernel.org/linux-kernel/20240816135823.87543-1-thorsten.blum@toblux.com/
---
 fs/smb/server/smb2pdu.c    | 4 ++--
 fs/smb/server/smb_common.h | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 2df1354288e6..1ce747b4636b 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -5357,7 +5357,7 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 					"NTFS", PATH_MAX, conn->local_nls, 0);
 		len = len * 2;
 		info->FileSystemNameLen = cpu_to_le32(len);
-		sz = sizeof(struct filesystem_attribute_info) - 2 + len;
+		sz = sizeof(struct filesystem_attribute_info) + len;
 		rsp->OutputBufferLength = cpu_to_le32(sz);
 		break;
 	}
@@ -5383,7 +5383,7 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 		len = len * 2;
 		info->VolumeLabelSize = cpu_to_le32(len);
 		info->Reserved = 0;
-		sz = sizeof(struct filesystem_vol_info) - 2 + len;
+		sz = sizeof(struct filesystem_vol_info) + len;
 		rsp->OutputBufferLength = cpu_to_le32(sz);
 		break;
 	}
diff --git a/fs/smb/server/smb_common.h b/fs/smb/server/smb_common.h
index 4a3148b0167f..cc1d6dfe29d5 100644
--- a/fs/smb/server/smb_common.h
+++ b/fs/smb/server/smb_common.h
@@ -213,7 +213,7 @@ struct filesystem_attribute_info {
 	__le32 Attributes;
 	__le32 MaxPathNameComponentLength;
 	__le32 FileSystemNameLen;
-	__le16 FileSystemName[1]; /* do not have to save this - get subset? */
+	__le16 FileSystemName[]; /* do not have to save this - get subset? */
 } __packed;
 
 struct filesystem_device_info {
@@ -226,7 +226,7 @@ struct filesystem_vol_info {
 	__le32 SerialNumber;
 	__le32 VolumeLabelSize;
 	__le16 Reserved;
-	__le16 VolumeLabel[1];
+	__le16 VolumeLabel[];
 } __packed;
 
 struct filesystem_info {
-- 
2.46.0