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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull vfs fixes from Al Viro:

 - a couple of ->i_link use-after-free fixes

 - regression fix for wrong errno on absent device name in mount(2)
   (this cycle stuff)

 - ancient UFS braino in large GID handling on Solaris UFS images (bogus
   cut'n'paste from large UID handling; wrong field checked to decide
   whether we should look at old (16bit) or new (32bit) field)

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ufs: fix braino in ufs_get_inode_gid() for solaris UFS flavour
  Abort file_remove_privs() for non-reg. files
  [fix] get rid of checking for absent device name in vfs_get_tree()
  apparmorfs: fix use-after-free on symlink traversal
  securityfs: fix use-after-free on symlink traversal
This commit is contained in:
Linus Torvalds 2019-05-05 09:28:45 -07:00
commit 51987affd6
5 changed files with 26 additions and 16 deletions
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9
fs/inode.c
View File

@ -1817,8 +1817,13 @@ int file_remove_privs(struct file *file)
int kill;
int error = 0;
/* Fast path for nothing security related */
if (IS_NOSEC(inode))
/*
* Fast path for nothing security related.
* As well for non-regular files, e.g. blkdev inodes.
* For example, blkdev_write_iter() might get here
* trying to remove privs which it is not allowed to.
*/
if (IS_NOSEC(inode) || !S_ISREG(inode->i_mode))
return 0;
kill = dentry_needs_remove_privs(dentry);

5
fs/super.c
View File

@ -1467,11 +1467,6 @@ int vfs_get_tree(struct fs_context *fc)
struct super_block *sb;
int error;
if (fc->fs_type->fs_flags & FS_REQUIRES_DEV && !fc->source) {
errorf(fc, "Filesystem requires source device");
return -ENOENT;
}
if (fc->root)
return -EBUSY;

2
fs/ufs/util.h
View File

@ -229,7 +229,7 @@ ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
case UFS_UID_44BSD:
return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
case UFS_UID_EFT:
if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
if (inode->ui_u1.oldids.ui_sgid == 0xFFFF)
return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
/* Fall through */
default:

13
security/apparmor/apparmorfs.c
View File

@ -123,17 +123,22 @@ static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
return 0;
}
static void aafs_evict_inode(struct inode *inode)
static void aafs_i_callback(struct rcu_head *head)
{
truncate_inode_pages_final(&inode->i_data);
clear_inode(inode);
struct inode *inode = container_of(head, struct inode, i_rcu);
if (S_ISLNK(inode->i_mode))
kfree(inode->i_link);
free_inode_nonrcu(inode);
}
static void aafs_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, aafs_i_callback);
}
static const struct super_operations aafs_super_ops = {
.statfs = simple_statfs,
.evict_inode = aafs_evict_inode,
.destroy_inode = aafs_destroy_inode,
.show_path = aafs_show_path,
};

13
security/inode.c
View File

@ -27,17 +27,22 @@
static struct vfsmount *mount;
static int mount_count;
static void securityfs_evict_inode(struct inode *inode)
static void securityfs_i_callback(struct rcu_head *head)
{
truncate_inode_pages_final(&inode->i_data);
clear_inode(inode);
struct inode *inode = container_of(head, struct inode, i_rcu);
if (S_ISLNK(inode->i_mode))
kfree(inode->i_link);
free_inode_nonrcu(inode);
}
static void securityfs_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, securityfs_i_callback);
}
static const struct super_operations securityfs_super_operations = {
.statfs = simple_statfs,
.evict_inode = securityfs_evict_inode,
.destroy_inode = securityfs_destroy_inode,
};
static int fill_super(struct super_block *sb, void *data, int silent)