diff options
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 1d5036dec08a15..786573479360ea 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1297,6 +1297,8 @@ static int shmem_setattr(struct mnt_idmap *idmap, return -EPERM; if (newsize != oldsize) { + if (info->flags & SHMEM_F_MAPPING_FROZEN) + return -EPERM; error = shmem_reacct_size(SHMEM_I(inode)->flags, oldsize, newsize); if (error) @@ -3289,6 +3291,10 @@ shmem_write_begin(const struct kiocb *iocb, struct address_space *mapping, return -EPERM; } + if (unlikely((info->flags & SHMEM_F_MAPPING_FROZEN) && + pos + len > inode->i_size)) + return -EPERM; + ret = shmem_get_folio(inode, index, pos + len, &folio, SGP_WRITE); if (ret) return ret; @@ -3662,6 +3668,11 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset, inode_lock(inode); + if (info->flags & SHMEM_F_MAPPING_FROZEN) { + error = -EPERM; + goto out; + } + if (mode & FALLOC_FL_PUNCH_HOLE) { struct address_space *mapping = file->f_mapping; loff_t unmap_start = round_up(offset, PAGE_SIZE); |