6.6.10

1 files changed, 0 insertions, 151 deletions

diff --git a/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch b/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
deleted file mode 100644
index 8c6bfa8cb473..000000000000
--- a/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
+++ /dev/null
@@ -1,151 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: "Jan Alexander Steffens (heftig)" <jan.steffens@gmail.com>
-Date: Mon, 16 Sep 2019 04:53:20 +0200
-Subject: [PATCH] ZEN: Add sysctl and CONFIG to disallow unprivileged
- CLONE_NEWUSER
-
-Our default behavior continues to match the vanilla kernel.
----
- include/linux/user_namespace.h |  4 ++++
- init/Kconfig                   | 16 ++++++++++++++++
- kernel/fork.c                  | 14 ++++++++++++++
- kernel/sysctl.c                | 12 ++++++++++++
- kernel/user_namespace.c        |  7 +++++++
- 5 files changed, 53 insertions(+)
-
-diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
-index 45f09bec02c4..87b20e2ee274 100644
---- a/include/linux/user_namespace.h
-+++ b/include/linux/user_namespace.h
-@@ -148,6 +148,8 @@ static inline void set_userns_rlimit_max(struct user_namespace *ns,
- 
- #ifdef CONFIG_USER_NS
- 
-+extern int unprivileged_userns_clone;
-+
- static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
- {
- 	if (ns)
-@@ -181,6 +183,8 @@ extern bool current_in_userns(const struct user_namespace *target_ns);
- struct ns_common *ns_get_owner(struct ns_common *ns);
- #else
- 
-+#define unprivileged_userns_clone 0
-+
- static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
- {
- 	return &init_user_ns;
-diff --git a/init/Kconfig b/init/Kconfig
-index de255842f5d0..4e028c5c976b 100644
---- a/init/Kconfig
-+++ b/init/Kconfig
-@@ -1248,6 +1248,22 @@ config USER_NS
- 
- 	  If unsure, say N.
- 
-+config USER_NS_UNPRIVILEGED
-+	bool "Allow unprivileged users to create namespaces"
-+	default y
-+	depends on USER_NS
-+	help
-+	  When disabled, unprivileged users will not be able to create
-+	  new namespaces. Allowing users to create their own namespaces
-+	  has been part of several recent local privilege escalation
-+	  exploits, so if you need user namespaces but are
-+	  paranoid^Wsecurity-conscious you want to disable this.
-+
-+	  This setting can be overridden at runtime via the
-+	  kernel.unprivileged_userns_clone sysctl.
-+
-+	  If unsure, say Y.
-+
- config PID_NS
- 	bool "PID Namespaces"
- 	default y
-diff --git a/kernel/fork.c b/kernel/fork.c
-index 41950ff90aa3..af4961b85f91 100644
---- a/kernel/fork.c
-+++ b/kernel/fork.c
-@@ -98,6 +98,10 @@
- #include <linux/io_uring.h>
- #include <linux/bpf.h>
- 
-+#ifdef CONFIG_USER_NS
-+#include <linux/user_namespace.h>
-+#endif
-+
- #include <asm/pgalloc.h>
- #include <linux/uaccess.h>
- #include <asm/mmu_context.h>
-@@ -2014,6 +2018,10 @@ static __latent_entropy struct task_struct *copy_process(
- 	if ((clone_flags & (CLONE_NEWUSER|CLONE_FS)) == (CLONE_NEWUSER|CLONE_FS))
- 		return ERR_PTR(-EINVAL);
- 
-+	if ((clone_flags & CLONE_NEWUSER) && !unprivileged_userns_clone)
-+		if (!capable(CAP_SYS_ADMIN))
-+			return ERR_PTR(-EPERM);
-+
- 	/*
- 	 * Thread groups must share signals as well, and detached threads
- 	 * can only be started up within the thread group.
-@@ -3173,6 +3181,12 @@ int ksys_unshare(unsigned long unshare_flags)
- 	if (unshare_flags & CLONE_NEWNS)
- 		unshare_flags |= CLONE_FS;
- 
-+	if ((unshare_flags & CLONE_NEWUSER) && !unprivileged_userns_clone) {
-+		err = -EPERM;
-+		if (!capable(CAP_SYS_ADMIN))
-+			goto bad_unshare_out;
-+	}
-+
- 	err = check_unshare_flags(unshare_flags);
- 	if (err)
- 		goto bad_unshare_out;
-diff --git a/kernel/sysctl.c b/kernel/sysctl.c
-index c6d9dec11b74..9a4514ad481b 100644
---- a/kernel/sysctl.c
-+++ b/kernel/sysctl.c
-@@ -81,6 +81,9 @@
- #ifdef CONFIG_RT_MUTEXES
- #include <linux/rtmutex.h>
- #endif
-+#ifdef CONFIG_USER_NS
-+#include <linux/user_namespace.h>
-+#endif
- 
- /* shared constants to be used in various sysctls */
- const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
-@@ -1659,6 +1662,15 @@ static struct ctl_table kern_table[] = {
- 		.mode		= 0644,
- 		.proc_handler	= proc_dointvec,
- 	},
-+#ifdef CONFIG_USER_NS
-+	{
-+		.procname	= "unprivileged_userns_clone",
-+		.data		= &unprivileged_userns_clone,
-+		.maxlen		= sizeof(int),
-+		.mode		= 0644,
-+		.proc_handler	= proc_dointvec,
-+	},
-+#endif
- #ifdef CONFIG_PROC_SYSCTL
- 	{
- 		.procname	= "tainted",
-diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
-index 54211dbd516c..16ca0c151629 100644
---- a/kernel/user_namespace.c
-+++ b/kernel/user_namespace.c
-@@ -22,6 +22,13 @@
- #include <linux/bsearch.h>
- #include <linux/sort.h>
- 
-+/* sysctl */
-+#ifdef CONFIG_USER_NS_UNPRIVILEGED
-+int unprivileged_userns_clone = 1;
-+#else
-+int unprivileged_userns_clone;
-+#endif
-+
- static struct kmem_cache *user_ns_cachep __read_mostly;
- static DEFINE_MUTEX(userns_state_mutex);
-