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Message-ID: <20241101081753.10585-2-almaz.alexandrovich@paragon-software.com>
Date: Fri, 1 Nov 2024 11:17:47 +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>,
<syzbot+1c25748a40fe79b8a119@...kaller.appspotmail.com>
Subject: [PATCH 1/7] fs/ntfs3: Fix warning in ni_fiemap
Use local runs_tree instead of cached. This way excludes rw_semaphore lock.
Reported-by: syzbot+1c25748a40fe79b8a119@...kaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
fs/ntfs3/attrib.c | 9 ++--
fs/ntfs3/frecord.c | 103 +++++++--------------------------------------
fs/ntfs3/ntfs_fs.h | 3 +-
3 files changed, 21 insertions(+), 94 deletions(-)
diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index 0763202d00c9..8d789b017fa9 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -977,7 +977,7 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
/* Check for compressed frame. */
err = attr_is_frame_compressed(ni, attr_b, vcn >> NTFS_LZNT_CUNIT,
- &hint);
+ &hint, run);
if (err)
goto out;
@@ -1521,16 +1521,16 @@ int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr,
* attr_is_frame_compressed - Used to detect compressed frame.
*
* attr - base (primary) attribute segment.
+ * run - run to use, usually == &ni->file.run.
* Only base segments contains valid 'attr->nres.c_unit'
*/
int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
- CLST frame, CLST *clst_data)
+ CLST frame, CLST *clst_data, struct runs_tree *run)
{
int err;
u32 clst_frame;
CLST clen, lcn, vcn, alen, slen, vcn_next;
size_t idx;
- struct runs_tree *run;
*clst_data = 0;
@@ -1542,7 +1542,6 @@ int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
clst_frame = 1u << attr->nres.c_unit;
vcn = frame * clst_frame;
- run = &ni->file.run;
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
err = attr_load_runs_vcn(ni, attr->type, attr_name(attr),
@@ -1678,7 +1677,7 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
if (err)
goto out;
- err = attr_is_frame_compressed(ni, attr_b, frame, &clst_data);
+ err = attr_is_frame_compressed(ni, attr_b, frame, &clst_data, run);
if (err)
goto out;
diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index 41c7ffad2790..c33e818b3164 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -1900,46 +1900,6 @@ enum REPARSE_SIGN ni_parse_reparse(struct ntfs_inode *ni, struct ATTRIB *attr,
return REPARSE_LINK;
}
-/*
- * fiemap_fill_next_extent_k - a copy of fiemap_fill_next_extent
- * but it uses 'fe_k' instead of fieinfo->fi_extents_start
- */
-static int fiemap_fill_next_extent_k(struct fiemap_extent_info *fieinfo,
- struct fiemap_extent *fe_k, u64 logical,
- u64 phys, u64 len, u32 flags)
-{
- struct fiemap_extent extent;
-
- /* only count the extents */
- if (fieinfo->fi_extents_max == 0) {
- fieinfo->fi_extents_mapped++;
- return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
- }
-
- if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
- return 1;
-
- if (flags & FIEMAP_EXTENT_DELALLOC)
- flags |= FIEMAP_EXTENT_UNKNOWN;
- if (flags & FIEMAP_EXTENT_DATA_ENCRYPTED)
- flags |= FIEMAP_EXTENT_ENCODED;
- if (flags & (FIEMAP_EXTENT_DATA_TAIL | FIEMAP_EXTENT_DATA_INLINE))
- flags |= FIEMAP_EXTENT_NOT_ALIGNED;
-
- memset(&extent, 0, sizeof(extent));
- extent.fe_logical = logical;
- extent.fe_physical = phys;
- extent.fe_length = len;
- extent.fe_flags = flags;
-
- memcpy(fe_k + fieinfo->fi_extents_mapped, &extent, sizeof(extent));
-
- fieinfo->fi_extents_mapped++;
- if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
- return 1;
- return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
-}
-
/*
* ni_fiemap - Helper for file_fiemap().
*
@@ -1950,11 +1910,9 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
__u64 vbo, __u64 len)
{
int err = 0;
- struct fiemap_extent *fe_k = NULL;
struct ntfs_sb_info *sbi = ni->mi.sbi;
u8 cluster_bits = sbi->cluster_bits;
- struct runs_tree *run;
- struct rw_semaphore *run_lock;
+ struct runs_tree run;
struct ATTRIB *attr;
CLST vcn = vbo >> cluster_bits;
CLST lcn, clen;
@@ -1965,13 +1923,11 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
u32 flags;
bool ok;
+ run_init(&run);
if (S_ISDIR(ni->vfs_inode.i_mode)) {
- run = &ni->dir.alloc_run;
attr = ni_find_attr(ni, NULL, NULL, ATTR_ALLOC, I30_NAME,
ARRAY_SIZE(I30_NAME), NULL, NULL);
- run_lock = &ni->dir.run_lock;
} else {
- run = &ni->file.run;
attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL,
NULL);
if (!attr) {
@@ -1986,7 +1942,6 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
"fiemap is not supported for compressed file (cp -r)");
goto out;
}
- run_lock = &ni->file.run_lock;
}
if (!attr || !attr->non_res) {
@@ -1998,51 +1953,33 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
goto out;
}
- /*
- * To avoid lock problems replace pointer to user memory by pointer to kernel memory.
- */
- fe_k = kmalloc_array(fieinfo->fi_extents_max,
- sizeof(struct fiemap_extent),
- GFP_NOFS | __GFP_ZERO);
- if (!fe_k) {
- err = -ENOMEM;
- goto out;
- }
-
end = vbo + len;
alloc_size = le64_to_cpu(attr->nres.alloc_size);
if (end > alloc_size)
end = alloc_size;
- down_read(run_lock);
while (vbo < end) {
if (idx == -1) {
- ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx);
+ ok = run_lookup_entry(&run, vcn, &lcn, &clen, &idx);
} else {
CLST vcn_next = vcn;
- ok = run_get_entry(run, ++idx, &vcn, &lcn, &clen) &&
+ ok = run_get_entry(&run, ++idx, &vcn, &lcn, &clen) &&
vcn == vcn_next;
if (!ok)
vcn = vcn_next;
}
if (!ok) {
- up_read(run_lock);
- down_write(run_lock);
-
err = attr_load_runs_vcn(ni, attr->type,
attr_name(attr),
- attr->name_len, run, vcn);
-
- up_write(run_lock);
- down_read(run_lock);
+ attr->name_len, &run, vcn);
if (err)
break;
- ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx);
+ ok = run_lookup_entry(&run, vcn, &lcn, &clen, &idx);
if (!ok) {
err = -EINVAL;
@@ -2067,8 +2004,9 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
} else if (is_attr_compressed(attr)) {
CLST clst_data;
- err = attr_is_frame_compressed(
- ni, attr, vcn >> attr->nres.c_unit, &clst_data);
+ err = attr_is_frame_compressed(ni, attr,
+ vcn >> attr->nres.c_unit,
+ &clst_data, &run);
if (err)
break;
if (clst_data < NTFS_LZNT_CLUSTERS)
@@ -2097,8 +2035,8 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
if (vbo + dlen >= end)
flags |= FIEMAP_EXTENT_LAST;
- err = fiemap_fill_next_extent_k(fieinfo, fe_k, vbo, lbo,
- dlen, flags);
+ err = fiemap_fill_next_extent(fieinfo, vbo, lbo, dlen,
+ flags);
if (err < 0)
break;
@@ -2119,8 +2057,7 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
if (vbo + bytes >= end)
flags |= FIEMAP_EXTENT_LAST;
- err = fiemap_fill_next_extent_k(fieinfo, fe_k, vbo, lbo, bytes,
- flags);
+ err = fiemap_fill_next_extent(fieinfo, vbo, lbo, bytes, flags);
if (err < 0)
break;
if (err == 1) {
@@ -2131,19 +2068,8 @@ int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo,
vbo += bytes;
}
- up_read(run_lock);
-
- /*
- * Copy to user memory out of lock
- */
- if (copy_to_user(fieinfo->fi_extents_start, fe_k,
- fieinfo->fi_extents_max *
- sizeof(struct fiemap_extent))) {
- err = -EFAULT;
- }
-
out:
- kfree(fe_k);
+ run_close(&run);
return err;
}
@@ -2672,7 +2598,8 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages,
down_write(&ni->file.run_lock);
run_truncate_around(run, le64_to_cpu(attr->nres.svcn));
frame = frame_vbo >> (cluster_bits + NTFS_LZNT_CUNIT);
- err = attr_is_frame_compressed(ni, attr, frame, &clst_data);
+ err = attr_is_frame_compressed(ni, attr, frame, &clst_data,
+ run);
up_write(&ni->file.run_lock);
if (err)
goto out1;
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index 26e1e1379c04..cd8e8374bb5a 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -446,7 +446,8 @@ int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr,
struct runs_tree *run, u64 frame, u64 frames,
u8 frame_bits, u32 *ondisk_size, u64 *vbo_data);
int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
- CLST frame, CLST *clst_data);
+ CLST frame, CLST *clst_data,
+ struct runs_tree *run);
int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
u64 new_valid);
int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes);
--
2.34.1
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