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Commit f3f1a183 authored by Seth Forshee's avatar Seth Forshee Committed by Eric W. Biederman
Browse files

fs: Allow CAP_SYS_ADMIN in s_user_ns to freeze and thaw filesystems 



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.

Signed-off-by: default avatarSeth Forshee <seth.forshee@canonical.com>
Acked-by: default avatarChristian Brauner <christian@brauner.io>
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
parent b1d749c5

fs/ioctl.c

+2 −2
Original line number Diff line number Diff line
@@ -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 */