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SubjectRe: [PATCH 07/11] fs: Allow CAP_SYS_ADMIN in s_user_ns to freeze and thaw filesystems
On Fri, Dec 22, 2017 at 03:32:31PM +0100, Dongsu Park wrote:
> From: Seth Forshee <seth.forshee@canonical.com>
>
> The user in control of a super block should be allowed to freeze
> and thaw it. Relax the restrictions on the FIFREEZE and FITHAW
> ioctls to require CAP_SYS_ADMIN in s_user_ns.
>
> Cc: linux-fsdevel@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Alexander Viro <viro@zeniv.linux.org.uk>
> Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
> Signed-off-by: Dongsu Park <dongsu@kinvolk.io>

Reviewed-by: Serge Hallyn <serge@hallyn.com>

> ---
> fs/ioctl.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ioctl.c b/fs/ioctl.c
> index 5ace7efb..8c628a8d 100644
> --- a/fs/ioctl.c
> +++ b/fs/ioctl.c
> @@ -549,7 +549,7 @@ static int ioctl_fsfreeze(struct file *filp)
> {
> struct super_block *sb = file_inode(filp)->i_sb;
>
> - if (!capable(CAP_SYS_ADMIN))
> + if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
> return -EPERM;
>
> /* If filesystem doesn't support freeze feature, return. */
> @@ -566,7 +566,7 @@ static int ioctl_fsthaw(struct file *filp)
> {
> struct super_block *sb = file_inode(filp)->i_sb;
>
> - if (!capable(CAP_SYS_ADMIN))
> + if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
> return -EPERM;
>
> /* Thaw */
> --
> 2.13.6
>
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> Containers@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/containers

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