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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-25 15:44:53 +0200 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-25 16:29:21 +0200 |
| commit | 89c0fd014d34d409a7b196667c2b9a4813b6c968 (patch) | |
| tree | 9fad0ab3ce77b7537ed7d8db45c40e746e26692f | |
| parent | nilfs2: avoid rec_len overflow with 64KB block size (diff) | |
| download | linux-89c0fd014d34d409a7b196667c2b9a4813b6c968.tar.xz linux-89c0fd014d34d409a7b196667c2b9a4813b6c968.zip | |
nilfs2: reject filesystem with unsupported block size
This inserts sanity check that refuses to mount a filesystem with
unsupported block size.
Previously, kernel code of nilfs was looking only limitation of
devices though mkfs.nilfs2 limits the range of block sizes; there was
no check that prevents rec_len overflow with larger block sizes.
With this change, block sizes larger than 64KB or smaller than 1KB
will get rejected explicitly by kernel.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
| -rw-r--r-- | fs/nilfs2/the_nilfs.c | 9 | ||||
| -rw-r--r-- | include/linux/nilfs2_fs.h | 6 |
2 files changed, 14 insertions, 1 deletions
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index da67b560f3c3..37de1f062d81 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -671,7 +671,7 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) goto out; } - blocksize = sb_min_blocksize(sb, BLOCK_SIZE); + blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE); if (!blocksize) { printk(KERN_ERR "NILFS: unable to set blocksize\n"); err = -EINVAL; @@ -690,6 +690,13 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) goto failed_sbh; blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); + if (blocksize < NILFS_MIN_BLOCK_SIZE || + blocksize > NILFS_MAX_BLOCK_SIZE) { + printk(KERN_ERR "NILFS: couldn't mount because of unsupported " + "filesystem blocksize %d\n", blocksize); + err = -EINVAL; + goto failed_sbh; + } if (sb->s_blocksize != blocksize) { int hw_blocksize = bdev_logical_block_size(sb->s_bdev); diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h index 970828a5ffc5..f5487b6f91ed 100644 --- a/include/linux/nilfs2_fs.h +++ b/include/linux/nilfs2_fs.h @@ -287,6 +287,12 @@ struct nilfs_super_block { #define NILFS_NAME_LEN 255 /* + * Block size limitations + */ +#define NILFS_MIN_BLOCK_SIZE 1024 +#define NILFS_MAX_BLOCK_SIZE 65536 + +/* * The new version of the directory entry. Since V0 structures are * stored in intel byte order, and the name_len field could never be * bigger than 255 chars, it's safe to reclaim the extra byte for the |