[PATCH AUTOSEL 6.5 05/52] fs/ntfs3: Add more attributes checks in mi_enum_attr()

Sasha Levin
2023-10-29T22:54:53Z

[ Upstream commit 013ff63b649475f0ee134e2c8d0c8e65284ede50 ]

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ntfs3/record.c | 68 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 52 insertions(+), 16 deletions(-)

diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
index c12ebffc94da4..02cc91ed88357 100644
--- a/fs/ntfs3/record.c
+++ b/fs/ntfs3/record.c
@@ -193,8 +193,9 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
{
const struct MFT_REC *rec = mi->mrec;
u32 used = le32_to_cpu(rec->used);
- u32 t32, off, asize;
+ u32 t32, off, asize, prev_type;
u16 t16;
+ u64 data_size, alloc_size, tot_size;

if (!attr) {
u32 total = le32_to_cpu(rec->total);
@@ -213,6 +214,7 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
if (!is_rec_inuse(rec))
return NULL;

+ prev_type = 0;
attr = Add2Ptr(rec, off);
} else {
/* Check if input attr inside record. */
@@ -226,11 +228,11 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
return NULL;
}

- if (off + asize < off) {
- /* Overflow check. */
+ /* Overflow check. */
+ if (off + asize < off)
return NULL;
- }

+ prev_type = le32_to_cpu(attr->type);
attr = Add2Ptr(attr, asize);
off += asize;
}
@@ -250,7 +252,11 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)

/* 0x100 is last known attribute for now. */
t32 = le32_to_cpu(attr->type);
- if ((t32 & 0xf) || (t32 > 0x100))
+ if (!t32 || (t32 & 0xf) || (t32 > 0x100))
+ return NULL;
+
+ /* attributes in record must be ordered by type */
+ if (t32 < prev_type)
return NULL;

/* Check overflow and boundary. */
@@ -259,16 +265,15 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)

/* Check size of attribute. */
if (!attr->non_res) {
+ /* Check resident fields. */
if (asize < SIZEOF_RESIDENT)
return NULL;

t16 = le16_to_cpu(attr->res.data_off);
-
if (t16 > asize)
return NULL;

- t32 = le32_to_cpu(attr->res.data_size);
- if (t16 + t32 > asize)
+ if (t16 + le32_to_cpu(attr->res.data_size) > asize)
return NULL;

t32 = sizeof(short) * attr->name_len;
@@ -278,21 +283,52 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
return attr;
}

- /* Check some nonresident fields. */
- if (attr->name_len &&
- le16_to_cpu(attr->name_off) + sizeof(short) * attr->name_len >
- le16_to_cpu(attr->nres.run_off)) {
+ /* Check nonresident fields. */
+ if (attr->non_res != 1)
+ return NULL;
+
+ t16 = le16_to_cpu(attr->nres.run_off);
+ if (t16 > asize)
+ return NULL;
+
+ t32 = sizeof(short) * attr->name_len;
+ if (t32 && le16_to_cpu(attr->name_off) + t32 > t16)
+ return NULL;
+
+ /* Check start/end vcn. */
+ if (le64_to_cpu(attr->nres.svcn) > le64_to_cpu(attr->nres.evcn) + 1)
+ return NULL;
+
+ data_size = le64_to_cpu(attr->nres.data_size);
+ if (le64_to_cpu(attr->nres.valid_size) > data_size)
return NULL;
- }

- if (attr->nres.svcn || !is_attr_ext(attr)) {
+ alloc_size = le64_to_cpu(attr->nres.alloc_size);
+ if (data_size > alloc_size)
+ return NULL;
+
+ t32 = mi->sbi->cluster_mask;
+ if (alloc_size & t32)
+ return NULL;
+
+ if (!attr->nres.svcn && is_attr_ext(attr)) {
+ /* First segment of sparse/compressed attribute */
+ if (asize + 8 < SIZEOF_NONRESIDENT_EX)
+ return NULL;
+
+ tot_size = le64_to_cpu(attr->nres.total_size);
+ if (tot_size & t32)
+ return NULL;
+
+ if (tot_size > alloc_size)
+ return NULL;
+ } else {
if (asize + 8 < SIZEOF_NONRESIDENT)
return NULL;

if (attr->nres.c_unit)
return NULL;
- } else if (asize + 8 < SIZEOF_NONRESIDENT_EX)
- return NULL;
+ }

return attr;
}
--
2.42.0