diff options
Diffstat (limited to 'sys-kernel/linux-image-redcore/files/6.8-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch')
| -rw-r--r-- | sys-kernel/linux-image-redcore/files/6.8-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/sys-kernel/linux-image-redcore/files/6.8-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch b/sys-kernel/linux-image-redcore/files/6.8-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch deleted file mode 100644 index 09d6a2c0..00000000 --- a/sys-kernel/linux-image-redcore/files/6.8-ZEN-Add-sysctl-and-CONFIG-to-disallow-unprivileged-C.patch +++ /dev/null @@ -1,131 +0,0 @@ -diff -Nur a/include/linux/user_namespace.h b/include/linux/user_namespace.h ---- a/include/linux/user_namespace.h 2024-02-23 08:51:59.000000000 +0000 -+++ b/include/linux/user_namespace.h 2024-02-24 11:24:37.945502209 +0000 -@@ -156,6 +156,8 @@ - - #ifdef CONFIG_USER_NS - -+extern int unprivileged_userns_clone; -+ - static inline struct user_namespace *get_user_ns(struct user_namespace *ns) - { - if (ns) -@@ -189,6 +191,8 @@ - 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 -Nur a/init/Kconfig b/init/Kconfig ---- a/init/Kconfig 2024-02-23 08:51:59.000000000 +0000 -+++ b/init/Kconfig 2024-02-24 11:24:37.945502209 +0000 -@@ -1235,6 +1235,22 @@ - - 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 -Nur a/kernel/fork.c b/kernel/fork.c ---- a/kernel/fork.c 2024-02-23 08:51:59.000000000 +0000 -+++ b/kernel/fork.c 2024-02-24 11:24:37.946502209 +0000 -@@ -100,6 +100,10 @@ - #include <linux/user_events.h> - #include <linux/iommu.h> - -+#ifdef CONFIG_USER_NS -+#include <linux/user_namespace.h> -+#endif -+ - #include <asm/pgalloc.h> - #include <linux/uaccess.h> - #include <asm/mmu_context.h> -@@ -2265,6 +2269,10 @@ - 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. -@@ -3411,6 +3419,12 @@ - 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 -Nur a/kernel/sysctl.c b/kernel/sysctl.c ---- a/kernel/sysctl.c 2024-02-23 08:51:59.000000000 +0000 -+++ b/kernel/sysctl.c 2024-02-24 11:24:37.946502209 +0000 -@@ -80,6 +80,9 @@ - #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 }; -@@ -1623,6 +1626,15 @@ - .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 -Nur a/kernel/user_namespace.c b/kernel/user_namespace.c ---- a/kernel/user_namespace.c 2024-02-23 08:51:59.000000000 +0000 -+++ b/kernel/user_namespace.c 2024-02-24 11:40:48.120538387 +0000 -@@ -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 __ro_after_init; - static DEFINE_MUTEX(userns_state_mutex); - |