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authorJoan Figueras2020-10-17 19:17:02 +0200
committerJoan Figueras2020-10-17 19:17:02 +0200
commitd263eda338e0a5a95769eed9c79a9bd386d86cac (patch)
tree9c476b374f17828cafbf0b19cd544d8798dafe49
parent7e4373d60d0181a6ee9df25705e5437b245711f9 (diff)
downloadaur-d263eda338e0a5a95769eed9c79a9bd386d86cac.tar.gz
Added 0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch
-rw-r--r--.SRCINFO4
-rw-r--r--0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch133
-rw-r--r--PKGBUILD4
3 files changed, 137 insertions, 4 deletions
diff --git a/.SRCINFO b/.SRCINFO
index 4942a8d5f11..53371c84bdf 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -20,14 +20,14 @@ pkgbase = linux-xanmod-rt
source = https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.9.tar.sign
source = https://github.com/xanmod/linux/releases/download/5.9.0-rt16-xanmod2/patch-5.9.0-rt16-xanmod2.xz
source = choose-gcc-optimization.sh
- source = 0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch::https://aur.archlinux.org/cgit/aur.git/plain/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch?h=linux-ck&id=616ec1bb1f2c0fc42b6fb5c20995996897b4f43b
+ source = 0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch
validpgpkeys = ABAF11C65A2970B130ABE3C479BE3E4300411886
validpgpkeys = 647F28654894E3BD457199BE38DBBDC86092693E
sha256sums = 3239a4ee1250bf2048be988cc8cb46c487b2c8a0de5b1b032d38394d5c6b1a06
sha256sums = SKIP
sha256sums = a94d0cadcb465a2b3021a772023951ea3a4d192d65e6fa0c2cfd9dd68dc62b5e
sha256sums = 2c7369218e81dee86f8ac15bda741b9bb34fa9cefcb087760242277a8207d511
- sha256sums = 9c507bdb0062b5b54c6969f7da9ec18b259e06cd26dbe900cfe79a7ffb2713ee
+ sha256sums = 6c66dba73251440352f93ff32b72f5dd49536d0f17ef9347867660fd3a626991
pkgname = linux-xanmod-rt
pkgdesc = The Linux kernel and modules with Xanmod patches
diff --git a/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch b/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch
new file mode 100644
index 00000000000..d7dee55dde5
--- /dev/null
+++ b/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch
@@ -0,0 +1,133 @@
+From a8d736bad70d4062a14c29bdcbed71bef7b575f5 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 01/15] ZEN: Add sysctl and CONFIG to disallow unprivileged
+ CLONE_NEWUSER
+
+Our default behavior continues to match the vanilla kernel.
+---
+ init/Kconfig | 16 ++++++++++++++++
+ kernel/fork.c | 15 +++++++++++++++
+ kernel/sysctl.c | 12 ++++++++++++
+ kernel/user_namespace.c | 7 +++++++
+ 4 files changed, 50 insertions(+)
+
+diff --git a/init/Kconfig b/init/Kconfig
+index b4daad2bac23..362f82c5ec07 100644
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -1118,6 +1118,22 @@ 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 755d8160e001..ed909f8050b2 100644
+--- a/kernel/fork.c
++++ b/kernel/fork.c
+@@ -106,6 +106,11 @@
+
+ #define CREATE_TRACE_POINTS
+ #include <trace/events/task.h>
++#ifdef CONFIG_USER_NS
++extern int unprivileged_userns_clone;
++#else
++#define unprivileged_userns_clone 0
++#endif
+
+ /*
+ * Minimum number of threads to boot the kernel
+@@ -1779,6 +1784,10 @@ 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.
+@@ -2836,6 +2845,12 @@ 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 70665934d53e..9797869ed829 100644
+--- a/kernel/sysctl.c
++++ b/kernel/sysctl.c
+@@ -111,6 +111,10 @@
+ static int sixty = 60;
+ #endif
+
++#ifdef CONFIG_USER_NS
++extern int unprivileged_userns_clone;
++#endif
++
+ static int __maybe_unused neg_one = -1;
+ static int __maybe_unused two = 2;
+ static int __maybe_unused four = 4;
+@@ -1881,6 +1885,15 @@
+ .mode = 0644,
+ .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
+ {
+diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
+index 8eadadc478f9..c36ecd19562c 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);
+
+--
+2.25.0
+
diff --git a/PKGBUILD b/PKGBUILD
index 179b7cb89f6..7b8a242f135 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -86,7 +86,7 @@ _srcname="linux-${pkgver}-rt${_rt}-xanmod${xanmod}"
source=("https://cdn.kernel.org/pub/linux/kernel/v${_branch}/linux-${_major}.tar."{xz,sign}
"https://github.com/xanmod/linux/releases/download/${pkgver}-rt${_rt}-xanmod${xanmod}/patch-${pkgver}-rt${_rt}-xanmod${xanmod}.xz"
choose-gcc-optimization.sh
- '0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch::https://aur.archlinux.org/cgit/aur.git/plain/0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch?h=linux-ck&id=616ec1bb1f2c0fc42b6fb5c20995996897b4f43b')
+ '0001-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-CLONE_NEWUSER.patch')
validpgpkeys=(
'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linux Torvalds
'647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
@@ -103,7 +103,7 @@ sha256sums=('3239a4ee1250bf2048be988cc8cb46c487b2c8a0de5b1b032d38394d5c6b1a06'
'SKIP'
'a94d0cadcb465a2b3021a772023951ea3a4d192d65e6fa0c2cfd9dd68dc62b5e'
'2c7369218e81dee86f8ac15bda741b9bb34fa9cefcb087760242277a8207d511'
- '9c507bdb0062b5b54c6969f7da9ec18b259e06cd26dbe900cfe79a7ffb2713ee')
+ '6c66dba73251440352f93ff32b72f5dd49536d0f17ef9347867660fd3a626991')
export KBUILD_BUILD_HOST=${KBUILD_BUILD_HOST:-archlinux}
export KBUILD_BUILD_USER=${KBUILD_BUILD_USER:-makepkg}