FAILED: patch "[PATCH] ntfs: fix memmove overlap in ntfs_new_attr_flags" failed to apply to 7.2-stable tree

FAILED: patch "[PATCH] ntfs: fix memmove overlap in ntfs_new_attr_flags" failed to apply to 7.2-stable tree

[gregkh]

The patch below does not apply to the 7.2-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-7.2.y
git checkout FETCH_HEAD
git cherry-pick -x acb1095fd2db884b417cb70808c886e4b615ff05
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026102234-sector-enjoyably-8d59@gregkh' --subject-prefix 'PATCH 7.2.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From acb1095fd2db884b417cb70808c886e4b615ff05 Mon Sep 17 00:00:00 2001
From: Hongling Zeng <zenghongling@kylinos.cn>
Date: Mon, 24 Aug 2026 15:59:35 +0800
Subject: [PATCH] ntfs: fix memmove overlap in ntfs_new_attr_flags

When the record shrinks while the payload offsets increase (e.g., enabling
compression reduces padding, making arec_size < old_arec_size, but the header
grows by 8 bytes), moving the name first can overwrite the old mapping_pairs
before they are copied. Move mapping_pairs first in this case.

Since mp_ofs is derived from name_ofs, they always change in the same
direction. Checking name_ofs alone is sufficient.

Fixes: fc053f05ca28 ("ntfs: add reparse and ea operations")
Cc: stable@vger.kernel.org
Signed-off-by: Hongling Zeng <zenghongling@kylinos.cn>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

diff --git a/fs/ntfs/ea.c b/fs/ntfs/ea.c
index 9f0222c172d9..0bc29bf1f050 100644
--- a/fs/ntfs/ea.c
+++ b/fs/ntfs/ea.c
@@ -753,15 +753,36 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	old_arec_size = le32_to_cpu(a->length);
 
 	/*
-	 * Move payloads before shrinking the record.  Otherwise resizing moves
+	 * Move payloads before shrinking the record. Otherwise resizing moves
 	 * the following attribute over the old payload before it can be copied.
+	 *
+	 * When offsets increase, move mapping_pairs first to avoid name
+	 * overwriting the start of mapping_pairs.
 	 */
 	if (arec_size < old_arec_size) {
-		if (a->name_length && name_ofs != old_name_ofs)
-			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
-				a->name_length * sizeof(__le16));
-		if (mp_ofs != old_mp_ofs)
-			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
+		if (name_ofs > old_name_ofs) {
+			/* Payload offsets increased: move mapping pairs first. */
+			if (mp_ofs != old_mp_ofs)
+				memmove((u8 *)a + mp_ofs,
+						(u8 *)a + old_mp_ofs,
+						mp_size);
+			if (a->name_length && name_ofs != old_name_ofs)
+				memmove((u8 *)a + name_ofs,
+						(u8 *)a + old_name_ofs,
+						a->name_length *
+							sizeof(__le16));
+		} else {
+			/* Payload offsets decreased or unchanged: move name first. */
+			if (a->name_length && name_ofs != old_name_ofs)
+				memmove((u8 *)a + name_ofs,
+						(u8 *)a + old_name_ofs,
+						a->name_length *
+							sizeof(__le16));
+			if (mp_ofs != old_mp_ofs)
+				memmove((u8 *)a + mp_ofs,
+						(u8 *)a + old_mp_ofs,
+						mp_size);
+		}
 	}
 
 	err = ntfs_attr_record_resize(ctx->mrec, a, arec_size);

[PATCH 7.2.y 1/3] ntfs: fix resident conversion in ntfs_new_attr_flags

[Sasha Levin]

From: Hyunchul Lee <hyc.lee@gmail.com>

[ Upstream commit 7ed0028126b5a19f278183abbae2b3166d3ca9ac ]

When setting sparse/compressed flags on a resident attribute, the
function skipped the resident-to-non-resident conversion and
terminated.

Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Stable-dep-of: acb1095fd2db ("ntfs: fix memmove overlap in ntfs_new_attr_flags")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ntfs/ea.c | 94 ++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 72 insertions(+), 22 deletions(-)

diff --git a/fs/ntfs/ea.c b/fs/ntfs/ea.c
index 223844782fe07..7f51c261ef3e7 100644
--- a/fs/ntfs/ea.c
+++ b/fs/ntfs/ea.c
@@ -630,6 +630,7 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	struct mft_record *m;
 	struct attr_record *a;
 	__le16 new_aflags;
+	u16 old_name_ofs, old_mp_ofs;
 	int mp_size, mp_ofs, name_ofs, arec_size, err;
 
 	m = map_mft_record(ni);
@@ -662,8 +663,10 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	else
 		new_aflags &= ~ATTR_IS_COMPRESSED;
 
-	if (new_aflags == a->flags)
-		return 0;
+	if (new_aflags == a->flags) {
+		err = 0;
+		goto err_out;
+	}
 
 	if ((new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) ==
 			  (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) {
@@ -672,15 +675,40 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 		goto err_out;
 	}
 
-	if (!a->non_resident)
-		goto out;
+	if (!a->non_resident) {
+		if (!(new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)))
+			return 0;
 
-	if (a->data.non_resident.data_size) {
-		pr_err("Can't change sparsed/compressed for non-empty file\n");
-		err = -EOPNOTSUPP;
-		goto err_out;
+		if (le32_to_cpu(a->data.resident.value_length)) {
+			pr_err("Can't change sparse/compressed for non-empty file");
+			err = -EOPNOTSUPP;
+			goto err_out;
+		}
+
+		err = ntfs_attr_make_non_resident(ni, 0);
+		if (err)
+			goto err_out;
+
+		ntfs_attr_reinit_search_ctx(ctx);
+		err = ntfs_attr_lookup(ni->type, ni->name,
+				ni->name_len, CASE_SENSITIVE,
+				0, NULL, 0, ctx);
+		if (err) {
+			err = -EINVAL;
+			goto err_out;
+		}
+		a = ctx->attr;
+	} else {
+		if (a->data.non_resident.data_size) {
+			pr_err("Can't change sparsed/compressed for non-empty file");
+			err = -EOPNOTSUPP;
+			goto err_out;
+		}
 	}
 
+	old_name_ofs = le16_to_cpu(a->name_offset);
+	old_mp_ofs = le16_to_cpu(a->data.non_resident.mapping_pairs_offset);
+
 	if (new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED))
 		name_ofs = (offsetof(struct attr_record,
 				     data.non_resident.compressed_size) +
@@ -703,6 +731,25 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	if (unlikely(err))
 		goto err_out;
 
+	/*
+	 * When compressed/sparse state changes, the non-resident header grows or
+	 * shrinks by the compressed_size field. Update the in-record payload layout
+	 * to match the new offsets before exposing the new mapping_pairs_offset.
+	 */
+	if (name_ofs > old_name_ofs) {
+		if (mp_ofs != old_mp_ofs)
+			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
+		if (a->name_length)
+			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
+				a->name_length * sizeof(__le16));
+	} else {
+		if (a->name_length && name_ofs != old_name_ofs)
+			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
+				a->name_length * sizeof(__le16));
+		if (mp_ofs != old_mp_ofs)
+			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
+	}
+
 	if (new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) {
 		a->data.non_resident.compression_unit = 0;
 		if (new_aflags & ATTR_IS_COMPRESSED || ni->vol->major_ver < 3)
@@ -723,28 +770,31 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 			ni->itype.compressed.block_size_bits = 0;
 			ni->itype.compressed.block_clusters = 0;
 		}
-
-		if (new_aflags & ATTR_IS_SPARSE) {
-			NInoSetSparse(ni);
-			ni->flags |= FILE_ATTR_SPARSE_FILE;
-		}
-
-		if (new_aflags & ATTR_IS_COMPRESSED) {
-			NInoSetCompressed(ni);
-			ni->flags |= FILE_ATTR_COMPRESSED;
-		}
 	} else {
-		ni->flags &= ~(FILE_ATTR_SPARSE_FILE | FILE_ATTR_COMPRESSED);
 		a->data.non_resident.compression_unit = 0;
-		NInoClearSparse(ni);
-		NInoClearCompressed(ni);
 	}
 
 	a->name_offset = cpu_to_le16(name_ofs);
 	a->data.non_resident.mapping_pairs_offset = cpu_to_le16(mp_ofs);
 
-out:
 	a->flags = new_aflags;
+
+	if (new_aflags & ATTR_IS_SPARSE) {
+		NInoSetSparse(ni);
+		ni->flags |= FILE_ATTR_SPARSE_FILE;
+	} else {
+		NInoClearSparse(ni);
+		ni->flags &= ~FILE_ATTR_SPARSE_FILE;
+	}
+
+	if (new_aflags & ATTR_IS_COMPRESSED) {
+		NInoSetCompressed(ni);
+		ni->flags |= FILE_ATTR_COMPRESSED;
+	} else {
+		NInoClearCompressed(ni);
+		ni->flags &= ~FILE_ATTR_COMPRESSED;
+	}
+
 	mark_mft_record_dirty(ctx->ntfs_ino);
 err_out:
 	if (ctx)
-- 
2.53.0

[PATCH 7.2.y 2/3] ntfs: move attribute payload before shrinking its record

[Sasha Levin]

From: Namjae Jeon <linkinjeon@kernel.org>

[ Upstream commit 0ab6dc1ac4601c8d79e5448a024daed6b0c5ef64 ]

ntfs_new_attr_flags() resizes the non-resident attribute record before
moving its name and mapping pairs to their shorter-header offsets when
compression or sparse state is cleared.

Shrinking the record first moves the following attribute over the tail of
the old record. The subsequent memmove() therefore copies bytes from that
following attribute instead of the old mapping pairs. Re-enabling
compression on an empty file persists those bytes as a malformed mapping
pairs array, which ntfsck reports as a missing or invalid run length.

Move the payload before shrinking the record, while retaining the existing
resize-before-move ordering when growing it.

Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Stable-dep-of: acb1095fd2db ("ntfs: fix memmove overlap in ntfs_new_attr_flags")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ntfs/ea.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/fs/ntfs/ea.c b/fs/ntfs/ea.c
index 7f51c261ef3e7..dc0a70041d788 100644
--- a/fs/ntfs/ea.c
+++ b/fs/ntfs/ea.c
@@ -631,7 +631,7 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	struct attr_record *a;
 	__le16 new_aflags;
 	u16 old_name_ofs, old_mp_ofs;
-	int mp_size, mp_ofs, name_ofs, arec_size, err;
+	int mp_size, mp_ofs, name_ofs, old_arec_size, arec_size, err;
 
 	m = map_mft_record(ni);
 	if (IS_ERR(m))
@@ -726,6 +726,19 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 
 	mp_ofs = (name_ofs + a->name_length * sizeof(__le16) + 7) & ~7;
 	arec_size = (mp_ofs + mp_size + 7) & ~7;
+	old_arec_size = le32_to_cpu(a->length);
+
+	/*
+	 * Move payloads before shrinking the record.  Otherwise resizing moves
+	 * the following attribute over the old payload before it can be copied.
+	 */
+	if (arec_size < old_arec_size) {
+		if (a->name_length && name_ofs != old_name_ofs)
+			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
+				a->name_length * sizeof(__le16));
+		if (mp_ofs != old_mp_ofs)
+			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
+	}
 
 	err = ntfs_attr_record_resize(ctx->mrec, a, arec_size);
 	if (unlikely(err))
@@ -736,18 +749,12 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	 * shrinks by the compressed_size field. Update the in-record payload layout
 	 * to match the new offsets before exposing the new mapping_pairs_offset.
 	 */
-	if (name_ofs > old_name_ofs) {
+	if (arec_size > old_arec_size) {
 		if (mp_ofs != old_mp_ofs)
 			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
 		if (a->name_length)
 			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
 				a->name_length * sizeof(__le16));
-	} else {
-		if (a->name_length && name_ofs != old_name_ofs)
-			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
-				a->name_length * sizeof(__le16));
-		if (mp_ofs != old_mp_ofs)
-			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
 	}
 
 	if (new_aflags & (ATTR_IS_SPARSE | ATTR_IS_COMPRESSED)) {
-- 
2.53.0

[PATCH 7.2.y 3/3] ntfs: fix memmove overlap in ntfs_new_attr_flags

[Sasha Levin]

From: Hongling Zeng <zenghongling@kylinos.cn>

[ Upstream commit acb1095fd2db884b417cb70808c886e4b615ff05 ]

When the record shrinks while the payload offsets increase (e.g., enabling
compression reduces padding, making arec_size < old_arec_size, but the header
grows by 8 bytes), moving the name first can overwrite the old mapping_pairs
before they are copied. Move mapping_pairs first in this case.

Since mp_ofs is derived from name_ofs, they always change in the same
direction. Checking name_ofs alone is sufficient.

Fixes: fc053f05ca28 ("ntfs: add reparse and ea operations")
Cc: stable@vger.kernel.org
Signed-off-by: Hongling Zeng <zenghongling@kylinos.cn>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ntfs/ea.c | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/fs/ntfs/ea.c b/fs/ntfs/ea.c
index dc0a70041d788..6cc0b6cfee920 100644
--- a/fs/ntfs/ea.c
+++ b/fs/ntfs/ea.c
@@ -729,15 +729,36 @@ static int ntfs_new_attr_flags(struct ntfs_inode *ni, __le32 fattr)
 	old_arec_size = le32_to_cpu(a->length);
 
 	/*
-	 * Move payloads before shrinking the record.  Otherwise resizing moves
+	 * Move payloads before shrinking the record. Otherwise resizing moves
 	 * the following attribute over the old payload before it can be copied.
+	 *
+	 * When offsets increase, move mapping_pairs first to avoid name
+	 * overwriting the start of mapping_pairs.
 	 */
 	if (arec_size < old_arec_size) {
-		if (a->name_length && name_ofs != old_name_ofs)
-			memmove((u8 *)a + name_ofs, (u8 *)a + old_name_ofs,
-				a->name_length * sizeof(__le16));
-		if (mp_ofs != old_mp_ofs)
-			memmove((u8 *)a + mp_ofs, (u8 *)a + old_mp_ofs, mp_size);
+		if (name_ofs > old_name_ofs) {
+			/* Payload offsets increased: move mapping pairs first. */
+			if (mp_ofs != old_mp_ofs)
+				memmove((u8 *)a + mp_ofs,
+						(u8 *)a + old_mp_ofs,
+						mp_size);
+			if (a->name_length && name_ofs != old_name_ofs)
+				memmove((u8 *)a + name_ofs,
+						(u8 *)a + old_name_ofs,
+						a->name_length *
+							sizeof(__le16));
+		} else {
+			/* Payload offsets decreased or unchanged: move name first. */
+			if (a->name_length && name_ofs != old_name_ofs)
+				memmove((u8 *)a + name_ofs,
+						(u8 *)a + old_name_ofs,
+						a->name_length *
+							sizeof(__le16));
+			if (mp_ofs != old_mp_ofs)
+				memmove((u8 *)a + mp_ofs,
+						(u8 *)a + old_mp_ofs,
+						mp_size);
+		}
 	}
 
 	err = ntfs_attr_record_resize(ctx->mrec, a, arec_size);
-- 
2.53.0