Patch "fs/ntfs3: fix panic about slab-out-of-bounds caused by ntfs_list_ea()" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    fs/ntfs3: fix panic about slab-out-of-bounds caused by ntfs_list_ea()

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-ntfs3-fix-panic-about-slab-out-of-bounds-caused-by-ntfs_list_ea.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 8e7e27b2ee1e19c4040d4987e345f678a74c0aed Mon Sep 17 00:00:00 2001
From: Zeng Heng <zengheng4@xxxxxxxxxx>
Date: Thu, 20 Apr 2023 15:46:22 +0800
Subject: fs/ntfs3: fix panic about slab-out-of-bounds caused by ntfs_list_ea()

From: Zeng Heng <zengheng4@xxxxxxxxxx>

commit 8e7e27b2ee1e19c4040d4987e345f678a74c0aed upstream.

Here is a BUG report about linux-6.1 from syzbot, but it still remains
within upstream:

BUG: KASAN: slab-out-of-bounds in ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
BUG: KASAN: slab-out-of-bounds in ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
Read of size 1 at addr ffff888021acaf3d by task syz-executor128/3632

Call Trace:
 kasan_report+0x139/0x170 mm/kasan/report.c:495
 ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
 ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x293/0x2d0 fs/xattr.c:804
 path_listxattr fs/xattr.c:828 [inline]
 __do_sys_llistxattr fs/xattr.c:846 [inline]

Before derefering field members of `ea` in unpacked_ea_size(), we need to
check whether the EA_FULL struct is located in access validate range.

Similarly, when derefering `ea->name` field member, we need to check
whethe the ea->name is located in access validate range, too.

Fixes: be71b5cba2e6 ("fs/ntfs3: Add attrib operations")
Reported-by: syzbot+9fcea5ef6dc4dc72d334@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Zeng Heng <zengheng4@xxxxxxxxxx>
[almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx: took the ret variable out of the loop block]
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ntfs3/xattr.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -211,7 +211,8 @@ static ssize_t ntfs_list_ea(struct ntfs_
 	size = le32_to_cpu(info->size);
 
 	/* Enumerate all xattrs. */
-	for (ret = 0, off = 0; off < size; off += ea_size) {
+	ret = 0;
+	for (off = 0; off + sizeof(struct EA_FULL) < size; off += ea_size) {
 		ea = Add2Ptr(ea_all, off);
 		ea_size = unpacked_ea_size(ea);
 
@@ -219,6 +220,10 @@ static ssize_t ntfs_list_ea(struct ntfs_
 			break;
 
 		if (buffer) {
+			/* Check if we can use field ea->name */
+			if (off + ea_size > size)
+				break;
+
 			if (ret + ea->name_len + 1 > bytes_per_buffer) {
 				err = -ERANGE;
 				goto out;


Patches currently in stable-queue which might be from zengheng4@xxxxxxxxxx are

queue-6.5/fs-ntfs3-fix-panic-about-slab-out-of-bounds-caused-by-ntfs_list_ea.patch



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