sys-kernel/linux-{image,sources}-redcore-lts : version bump

1 files changed, 151 insertions, 0 deletions

diff --git a/sys-kernel/linux-sources-redcore-lts/files/5.15-0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch b/sys-kernel/linux-sources-redcore-lts/files/5.15-0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
new file mode 100644
index 00000000..ddfbd03b
--- /dev/null
+++ b/sys-kernel/linux-sources-redcore-lts/files/5.15-0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch
@@ -0,0 +1,151 @@
+From 0948f6ce6d898c598f8fe88240954e578fdc8387 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 33a4240e6a6f1..82213f9c4c17f 100644
+--- a/include/linux/user_namespace.h
++++ b/include/linux/user_namespace.h
+@@ -139,6 +139,8 @@ static inline void set_rlimit_ucount_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)
+@@ -172,6 +174,8 @@ 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 11f8a845f259d..02b7a0e455a5d 100644
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -1226,6 +1226,22 @@ 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 10885c649ca42..e0fe98e1afbdb 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>
+@@ -1950,6 +1954,10 @@ 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.
+@@ -3056,6 +3064,12 @@ 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 083be6af29d70..42aa3c7835b96 100644
+--- a/kernel/sysctl.c
++++ b/kernel/sysctl.c
+@@ -105,6 +105,9 @@
+ #ifdef CONFIG_LOCKUP_DETECTOR
+ #include <linux/nmi.h>
+ #endif
++#ifdef CONFIG_USER_NS
++#include <linux/user_namespace.h>
++#endif
+ 
+ #if defined(CONFIG_SYSCTL)
+ 
+@@ -1949,6 +1952,15 @@ static struct ctl_table kern_table[] = {
+ 		.proc_handler	= proc_dointvec,
+ 	},
+ #endif
++#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 6b2e3ca7ee993..0253002184f1d 100644
+--- a/kernel/user_namespace.c
++++ b/kernel/user_namespace.c
+@@ -21,6 +21,13 @@
+ #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);
+