linux-kernel - [PATCH 4/7] fs/ntfs3: Add more checks in mi_enum

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Message-ID: <20241101081753.10585-5-almaz.alexandrovich@paragon-software.com>
Date: Fri, 1 Nov 2024 11:17:50 +0300
From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To: <ntfs3@...ts.linux.dev>
CC: <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	Konstantin Komarov <almaz.alexandrovich@...agon-software.com>, lei lu
	<llfamsec@...il.com>
Subject: [PATCH 4/7] fs/ntfs3: Add more checks in mi_enum_attr (part 2)

Add offset check before access to attr->non_res field as mentioned in [1].

[1] https://lore.kernel.org/ntfs3/20241010110005.42792-1-llfamsec@gmail.com/

Suggested-by: lei lu <llfamsec@...il.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
 fs/ntfs3/record.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
index f810f0419d25..61d53d39f3b9 100644
--- a/fs/ntfs3/record.c
+++ b/fs/ntfs3/record.c
@@ -212,7 +212,7 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
 			return NULL;
 
 		if (off >= used || off < MFTRECORD_FIXUP_OFFSET_1 ||
-		    !IS_ALIGNED(off, 4)) {
+		    !IS_ALIGNED(off, 8)) {
 			return NULL;
 		}
 
@@ -236,8 +236,11 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
 		off += asize;
 	}
 
-	/* Can we use the first field (attr->type). */
-	/* NOTE: this code also checks attr->size availability. */
+	/*
+	 * Can we use the first fields:
+	 * attr->type,
+	 * attr->size
+	 */
 	if (off + 8 > used) {
 		static_assert(ALIGN(sizeof(enum ATTR_TYPE), 8) == 8);
 		return NULL;
@@ -259,10 +262,17 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
 
 	asize = le32_to_cpu(attr->size);
 
+	if (!IS_ALIGNED(asize, 8))
+		return NULL;
+
 	/* Check overflow and boundary. */
 	if (off + asize < off || off + asize > used)
 		return NULL;
 
+	/* Can we use the field attr->non_res. */
+	if (off + 9 > used)
+		return NULL;
+
 	/* Check size of attribute. */
 	if (!attr->non_res) {
 		/* Check resident fields. */
-- 
2.34.1