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ext4: implement filesystem specific alloc_inode in unit test

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We expect inode with ext4_info_info type as following:
mbt_kunit_init
  mbt_mb_init
    ext4_mb_init
      ext4_mb_init_backend
        sbi->s_buddy_cache = new_inode(sb);
        EXT4_I(sbi->s_buddy_cache)->i_disksize = 0;

Implement alloc_inode ionde with ext4_inode_info type to avoid
out-of-bounds write.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240322165518.8147-1-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2024-03-23 00:55:18 +08:00 committed by Theodore Ts'o
parent 0a46ef2347
commit a11adf7be9
1 changed files with 24 additions and 0 deletions
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24
fs/ext4/mballoc-test.c
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@ -30,7 +30,31 @@ struct mbt_ext4_super_block {
#define MBT_CTX(_sb) (&MBT_SB(_sb)->mbt_ctx)
#define MBT_GRP_CTX(_sb, _group) (&MBT_CTX(_sb)->grp_ctx[_group])
static struct inode *mbt_alloc_inode(struct super_block *sb)
{
struct ext4_inode_info *ei;
ei = kmalloc(sizeof(struct ext4_inode_info), GFP_KERNEL);
if (!ei)
return NULL;
INIT_LIST_HEAD(&ei->i_orphan);
init_rwsem(&ei->xattr_sem);
init_rwsem(&ei->i_data_sem);
inode_init_once(&ei->vfs_inode);
ext4_fc_init_inode(&ei->vfs_inode);
return &ei->vfs_inode;
}
static void mbt_free_inode(struct inode *inode)
{
kfree(EXT4_I(inode));
}
static const struct super_operations mbt_sops = {
.alloc_inode = mbt_alloc_inode,
.free_inode = mbt_free_inode,
};
static void mbt_kill_sb(struct super_block *sb)