From: Eric W. Biederman <ebiederm@xmission.com>
Date: Tue, 31 Jul 2012 08:14:12 +0000 (-0700)
Subject: vfs: Allow chroot if you have CAP_SYS_CHROOT in your user namespace
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a85fb273c94648cbf20a5f9bcf8bbbb075f271ad;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

vfs: Allow chroot if you have CAP_SYS_CHROOT in your user namespace

Once you are confined to a user namespace applications can not gain
privilege and escape the user namespace so there is no longer a reason
to restrict chroot.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---

diff --git a/fs/open.c b/fs/open.c
index 59071f55bf7f..182d8667b7bd 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -435,7 +435,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
 		goto dput_and_out;
 
 	error = -EPERM;
-	if (!capable(CAP_SYS_CHROOT))
+	if (!nsown_capable(CAP_SYS_CHROOT))
 		goto dput_and_out;
 	error = security_path_chroot(&path);
 	if (error)