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| Started by | Seth Forshee <seth.forshee@canonical.com> |
|---|---|
| First post | 2015-12-02 16:50 +0100 |
| Last post | 2015-12-02 16:50 +0100 |
| Articles | 1 — 1 participant |
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[PATCH 13/19] fs: Allow superblock owner to access do_remount_sb() Seth Forshee <seth.forshee@canonical.com> - 2015-12-02 16:50 +0100
| From | Seth Forshee <seth.forshee@canonical.com> |
|---|---|
| Date | 2015-12-02 16:50 +0100 |
| Subject | [PATCH 13/19] fs: Allow superblock owner to access do_remount_sb() |
| Message-ID | <qBhPj-FC-13@gated-at.bofh.it> |
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> --- 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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