Re: [PATCH 3/4] fs: teach vfs_ioc_fssetxattr_check to check project id info

Jan Kara
2019-06-20T13:41:22Z

On Mon 10-06-19 21:45:57, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
>
> Standardize the project id checks for FSSETXATTR.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

The patch looks good to me. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza

> ---
> fs/ext4/ioctl.c | 27 ---------------------------
> fs/f2fs/file.c | 27 ---------------------------
> fs/inode.c | 13 +++++++++++++
> fs/xfs/xfs_ioctl.c | 15 ---------------
> 4 files changed, 13 insertions(+), 69 deletions(-)
>
>
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index c2f48c90ca45..6aa1df1918f7 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -697,30 +697,6 @@ static long ext4_ioctl_group_add(struct file *file,
> return err;
> }
>
> -static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
> -{
> - /*
> - * Project Quota ID state is only allowed to change from within the init
> - * namespace. Enforce that restriction only if we are trying to change
> - * the quota ID state. Everything else is allowed in user namespaces.
> - */
> - if (current_user_ns() == &init_user_ns)
> - return 0;
> -
> - if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
> - return -EINVAL;
> -
> - if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
> - if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
> - return -EINVAL;
> - } else {
> - if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
> - return -EINVAL;
> - }
> -
> - return 0;
> -}
> -
> static void ext4_fsgetxattr(struct inode *inode, struct fsxattr *fa)
> {
> struct ext4_inode_info *ei = EXT4_I(inode);
> @@ -1135,9 +1111,6 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>
> inode_lock(inode);
> ext4_fsgetxattr(inode, &old_fa);
> - err = ext4_ioctl_check_project(inode, &fa);
> - if (err)
> - goto out;
> err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
> if (err)
> goto out;
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index f707de6bd4a8..183ed1ac60e1 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2799,30 +2799,6 @@ static int f2fs_ioc_fsgetxattr(struct file *filp, unsigned long arg)
> return 0;
> }
>
> -static int f2fs_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
> -{
> - /*
> - * Project Quota ID state is only allowed to change from within the init
> - * namespace. Enforce that restriction only if we are trying to change
> - * the quota ID state. Everything else is allowed in user namespaces.
> - */
> - if (current_user_ns() == &init_user_ns)
> - return 0;
> -
> - if (__kprojid_val(F2FS_I(inode)->i_projid) != fa->fsx_projid)
> - return -EINVAL;
> -
> - if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL) {
> - if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
> - return -EINVAL;
> - } else {
> - if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
> - return -EINVAL;
> - }
> -
> - return 0;
> -}
> -
> static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
> {
> struct inode *inode = file_inode(filp);
> @@ -2850,9 +2826,6 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
> return err;
>
> inode_lock(inode);
> - err = f2fs_ioctl_check_project(inode, &fa);
> - if (err)
> - goto out;
>
> __f2fs_ioc_fsgetxattr(inode, &old_fa);
> err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
> diff --git a/fs/inode.c b/fs/inode.c
> index 026955258a47..40ecd3a6a188 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -2201,6 +2201,19 @@ int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
> !capable(CAP_LINUX_IMMUTABLE))
> return -EPERM;
>
> + /*
> + * Project Quota ID state is only allowed to change from within the init
> + * namespace. Enforce that restriction only if we are trying to change
> + * the quota ID state. Everything else is allowed in user namespaces.
> + */
> + if (current_user_ns() != &init_user_ns) {
> + if (old_fa->fsx_projid != fa->fsx_projid)
> + return -EINVAL;
> + if ((old_fa->fsx_xflags ^ fa->fsx_xflags) &
> + FS_XFLAG_PROJINHERIT)
> + return -EINVAL;
> + }
> +
> return 0;
> }
> EXPORT_SYMBOL(vfs_ioc_fssetxattr_check);
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 08c24f2f55c3..82961de98900 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -1299,21 +1299,6 @@ xfs_ioctl_setattr_check_projid(
> if (fa->fsx_projid > (uint16_t)-1 &&
> !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
> return -EINVAL;
> -
> - /*
> - * Project Quota ID state is only allowed to change from within the init
> - * namespace. Enforce that restriction only if we are trying to change
> - * the quota ID state. Everything else is allowed in user namespaces.
> - */
> - if (current_user_ns() == &init_user_ns)
> - return 0;
> -
> - if (xfs_get_projid(ip) != fa->fsx_projid)
> - return -EINVAL;
> - if ((fa->fsx_xflags & FS_XFLAG_PROJINHERIT) !=
> - (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
> - return -EINVAL;
> -
> return 0;
> }
>
>
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR