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more conservative S_NOSEC handling

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Caching "we have already removed suid/caps" was overenthusiastic as merged.
On network filesystems we might have had suid/caps set on another client,
silently picked by this client on revalidate, all of that *without* clearing
the S_NOSEC flag.

AFAICS, the only reasonably sane way to deal with that is
	* new superblock flag; unless set, S_NOSEC is not going to be set.
	* local block filesystems set it in their ->mount() (more accurately,
mount_bdev() does, so does btrfs ->mount(), users of mount_bdev() other than
local block ones clear it)
	* if any network filesystem (or a cluster one) wants to use S_NOSEC,
it'll need to set MS_NOSEC in sb->s_flags *AND* take care to clear S_NOSEC when
inode attribute changes are picked from other clients.

It's not an earth-shattering hole (anybody that can set suid on another client
will almost certainly be able to write to the file before doing that anyway),
but it's a bug that needs fixing.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-06-03 18:24:58 -04:00
parent 1fa7b6a29c
commit 9e1f1de02c
6 changed files with 8 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/btrfs/super.c
View file

@ -819,7 +819,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
} else {
char b[BDEVNAME_SIZE];
s->s_flags = flags;
s->s_flags = flags | MS_NOSEC;
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
error = btrfs_fill_super(s, fs_devices, data,
flags & MS_SILENT ? 1 : 0);

2
fs/fuse/inode.c
View file

@ -921,6 +921,8 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
if (sb->s_flags & MS_MANDLOCK)
goto err;
sb->s_flags &= ~MS_NOSEC;
if (!parse_fuse_opt((char *) data, &d, is_bdev))
goto err;

2
fs/ocfs2/super.c
View file

@ -1072,7 +1072,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
sb->s_magic = OCFS2_SUPER_MAGIC;
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
/* Hard readonly mode only if: bdev_read_only, MS_RDONLY,

2
fs/super.c
View file

@ -822,7 +822,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
} else {
char b[BDEVNAME_SIZE];
s->s_flags = flags;
s->s_flags = flags | MS_NOSEC;
s->s_mode = mode;
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
sb_set_blocksize(s, block_size(bdev));

3
include/linux/fs.h
View file

@ -208,6 +208,7 @@ struct inodes_stat_t {
#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
#define MS_I_VERSION (1<<23) /* Update inode I_version field */
#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
#define MS_NOSEC (1<<28)
#define MS_BORN (1<<29)
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
@ -2591,7 +2592,7 @@ static inline int is_sxid(mode_t mode)
static inline void inode_has_no_xattr(struct inode *inode)
{
if (!is_sxid(inode->i_mode))
if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
inode->i_flags |= S_NOSEC;
}

2
mm/filemap.c
View file

@ -2000,7 +2000,7 @@ int file_remove_suid(struct file *file)
error = security_inode_killpriv(dentry);
if (!error && killsuid)
error = __remove_suid(dentry, killsuid);
if (!error)
if (!error && (inode->i_sb->s_flags & MS_NOSEC))
inode->i_flags |= S_NOSEC;
return error;