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Groups > linux.kernel > #1300926
| From | Seth Forshee <seth.forshee@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH RESEND v2 13/18] fs: Allow superblock owner to access do_remount_sb() |
| Date | 2016-01-04 19:20 +0100 |
| Message-ID | <qNhTB-73f-21@gated-at.bofh.it> (permalink) |
| References | <qNhJT-6ZN-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Superblock level remounts are currently restricted to global CAP_SYS_ADMIN, as is the path for changing the root mount to read only on umount. Loosen both of these permission checks to also allow CAP_SYS_ADMIN in any namespace which is privileged towards the userns which originally mounted the filesystem. Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> --- fs/namespace.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 18fc58760aec..b00a765895e7 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1510,7 +1510,7 @@ static int do_umount(struct mount *mnt, int flags) * Special case for "unmounting" root ... * we just try to remount it readonly. */ - if (!capable(CAP_SYS_ADMIN)) + if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) return -EPERM; down_write(&sb->s_umount); if (!(sb->s_flags & MS_RDONLY)) @@ -2199,7 +2199,7 @@ static int do_remount(struct path *path, int flags, int mnt_flags, down_write(&sb->s_umount); if (flags & MS_BIND) err = change_mount_flags(path->mnt, flags); - else if (!capable(CAP_SYS_ADMIN)) + else if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) err = -EPERM; else err = do_remount_sb(sb, flags, data, 0); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH RESEND v2 00/19] Support fuse mounts in user namespaces Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:10 +0100 [PATCH RESEND v2 04/18] selinux: Add support for unprivileged mounts from user namespaces Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:10 +0100 [PATCH RESEND v2 10/18] fs: Update posix_acl support to handle user namespace mounts Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:10 +0100 [PATCH RESEND v2 16/18] fuse: Support fuse filesystems outside of init_user_ns Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:10 +0100 [PATCH RESEND v2 12/18] fs: Don't remove suid for CAP_FSETID in s_user_ns Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:20 +0100 [PATCH RESEND v2 13/18] fs: Allow superblock owner to access do_remount_sb() Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:20 +0100 [PATCH RESEND v2 02/18] block_dev: Check permissions towards block device inode when mounting Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:20 +0100 [PATCH RESEND v2 11/18] fs: Ensure the mounter of a filesystem is privileged towards its inodes Seth Forshee <seth.forshee@canonical.com> - 2016-01-04 19:20 +0100
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