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- Make sure only regular inodes can be used for file-backed mounts;
 
  - Two minor codebase cleanups.
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Merge tag 'erofs-for-6.12-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs fixes from Gao Xiang:
 "The main one fixes a syzbot issue due to the invalid inode type out of
  file-backed mounts. The others are minor cleanups without actual logic
  changes.

  Summary:

   - Make sure only regular inodes can be used for file-backed mounts

   - Two minor codebase cleanups"

* tag 'erofs-for-6.12-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: get rid of kaddr in `struct z_erofs_maprecorder`
  erofs: get rid of z_erofs_try_to_claim_pcluster()
  erofs: ensure regular inodes for file-backed mounts
This commit is contained in:
Linus Torvalds 2024-10-14 11:12:09 -07:00
commit 63fa605041
3 changed files with 31 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/erofs/super.c
View File

@ -191,10 +191,14 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
if (IS_ERR(file))
return PTR_ERR(file);
dif->file = file;
if (!erofs_is_fileio_mode(sbi))
if (!erofs_is_fileio_mode(sbi)) {
dif->dax_dev = fs_dax_get_by_bdev(file_bdev(file),
&dif->dax_part_off, NULL, NULL);
} else if (!S_ISREG(file_inode(file)->i_mode)) {
fput(file);
return -EINVAL;
}
dif->file = file;
}
dif->blocks = le32_to_cpu(dis->blocks);
@ -714,7 +718,10 @@ static int erofs_fc_get_tree(struct fs_context *fc)
if (IS_ERR(sbi->fdev))
return PTR_ERR(sbi->fdev);
return get_tree_nodev(fc, erofs_fc_fill_super);
if (S_ISREG(file_inode(sbi->fdev)->i_mode) &&
sbi->fdev->f_mapping->a_ops->read_folio)
return get_tree_nodev(fc, erofs_fc_fill_super);
fput(sbi->fdev);
}
#endif
return ret;

29
fs/erofs/zdata.c
View File

@ -710,24 +710,6 @@ static int z_erofs_attach_page(struct z_erofs_decompress_frontend *fe,
return ret;
}
static void z_erofs_try_to_claim_pcluster(struct z_erofs_decompress_frontend *f)
{
struct z_erofs_pcluster *pcl = f->pcl;
z_erofs_next_pcluster_t *owned_head = &f->owned_head;
/* type 1, nil pcluster (this pcluster doesn't belong to any chain.) */
if (cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_NIL,
*owned_head) == Z_EROFS_PCLUSTER_NIL) {
*owned_head = &pcl->next;
/* so we can attach this pcluster to our submission chain. */
f->mode = Z_EROFS_PCLUSTER_FOLLOWED;
return;
}
/* type 2, it belongs to an ongoing chain */
f->mode = Z_EROFS_PCLUSTER_INFLIGHT;
}
static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe)
{
struct erofs_map_blocks *map = &fe->map;
@ -803,7 +785,6 @@ static int z_erofs_pcluster_begin(struct z_erofs_decompress_frontend *fe)
int ret;
DBG_BUGON(fe->pcl);
/* must be Z_EROFS_PCLUSTER_TAIL or pointed to previous pcluster */
DBG_BUGON(fe->owned_head == Z_EROFS_PCLUSTER_NIL);
@ -823,7 +804,15 @@ static int z_erofs_pcluster_begin(struct z_erofs_decompress_frontend *fe)
if (ret == -EEXIST) {
mutex_lock(&fe->pcl->lock);
z_erofs_try_to_claim_pcluster(fe);
/* check if this pcluster hasn't been linked into any chain. */
if (cmpxchg(&fe->pcl->next, Z_EROFS_PCLUSTER_NIL,
fe->owned_head) == Z_EROFS_PCLUSTER_NIL) {
/* .. so it can be attached to our submission chain */
fe->owned_head = &fe->pcl->next;
fe->mode = Z_EROFS_PCLUSTER_FOLLOWED;
} else { /* otherwise, it belongs to an inflight chain */
fe->mode = Z_EROFS_PCLUSTER_INFLIGHT;
}
} else if (ret) {
return ret;
}

32
fs/erofs/zmap.c
View File

@ -10,8 +10,6 @@
struct z_erofs_maprecorder {
struct inode *inode;
struct erofs_map_blocks *map;
void *kaddr;
unsigned long lcn;
/* compression extent information gathered */
u8 type, headtype;
@ -33,14 +31,11 @@ static int z_erofs_load_full_lcluster(struct z_erofs_maprecorder *m,
struct z_erofs_lcluster_index *di;
unsigned int advise;
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
pos, EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
m->nextpackoff = pos + sizeof(struct z_erofs_lcluster_index);
di = erofs_read_metabuf(&m->map->buf, inode->i_sb, pos, EROFS_KMAP);
if (IS_ERR(di))
return PTR_ERR(di);
m->lcn = lcn;
di = m->kaddr;
m->nextpackoff = pos + sizeof(struct z_erofs_lcluster_index);
advise = le16_to_cpu(di->di_advise);
m->type = advise & Z_EROFS_LI_LCLUSTER_TYPE_MASK;
@ -53,8 +48,7 @@ static int z_erofs_load_full_lcluster(struct z_erofs_maprecorder *m,
DBG_BUGON(1);
return -EFSCORRUPTED;
}
m->compressedblks = m->delta[0] &
~Z_EROFS_LI_D0_CBLKCNT;
m->compressedblks = m->delta[0] & ~Z_EROFS_LI_D0_CBLKCNT;
m->delta[0] = 1;
}
m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
@ -110,9 +104,9 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
struct erofs_inode *const vi = EROFS_I(m->inode);
const unsigned int lclusterbits = vi->z_logical_clusterbits;
unsigned int vcnt, lo, lobits, encodebits, nblk, bytes;
int i;
u8 *in, type;
bool big_pcluster;
u8 *in, type;
int i;
if (1 << amortizedshift == 4 && lclusterbits <= 14)
vcnt = 2;
@ -121,6 +115,10 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
else
return -EOPNOTSUPP;
in = erofs_read_metabuf(&m->map->buf, m->inode->i_sb, pos, EROFS_KMAP);
if (IS_ERR(in))
return PTR_ERR(in);
/* it doesn't equal to round_up(..) */
m->nextpackoff = round_down(pos, vcnt << amortizedshift) +
(vcnt << amortizedshift);
@ -128,9 +126,7 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
lobits = max(lclusterbits, ilog2(Z_EROFS_LI_D0_CBLKCNT) + 1U);
encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
bytes = pos & ((vcnt << amortizedshift) - 1);
in = m->kaddr - bytes;
in -= bytes;
i = bytes >> amortizedshift;
lo = decode_compactedbits(lobits, in, encodebits * i, &type);
@ -255,10 +251,6 @@ static int z_erofs_load_compact_lcluster(struct z_erofs_maprecorder *m,
amortizedshift = 2;
out:
pos += lcn * (1 << amortizedshift);
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
pos, EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
return unpack_compacted_index(m, amortizedshift, pos, lookahead);
}