diff options
Diffstat (limited to '0001-security-lockdown-expose-a-hook-to-lock-the-kernel-d.patch')
| -rw-r--r-- | 0001-security-lockdown-expose-a-hook-to-lock-the-kernel-d.patch | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/0001-security-lockdown-expose-a-hook-to-lock-the-kernel-d.patch b/0001-security-lockdown-expose-a-hook-to-lock-the-kernel-d.patch new file mode 100644 index 000000000..fc6b78ad0 --- /dev/null +++ b/0001-security-lockdown-expose-a-hook-to-lock-the-kernel-d.patch @@ -0,0 +1,103 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Jeremy Cline <jcline@redhat.com> +Date: Mon, 30 Sep 2019 21:22:47 +0000 +Subject: [PATCH] security: lockdown: expose a hook to lock the kernel down + +In order to automatically lock down kernels running on UEFI machines +booted in Secure Boot mode, expose the lock_kernel_down() hook. + +Upstream Status: RHEL only +Signed-off-by: Jeremy Cline <jcline@redhat.com> +--- + include/linux/lsm_hook_defs.h | 2 ++ + include/linux/lsm_hooks.h | 6 ++++++ + include/linux/security.h | 5 +++++ + security/lockdown/lockdown.c | 1 + + security/security.c | 6 ++++++ + 5 files changed, 20 insertions(+) + +diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h +index 5616b2567aa7..bc5caab1413b 100644 +--- a/include/linux/lsm_hook_defs.h ++++ b/include/linux/lsm_hook_defs.h +@@ -371,6 +371,8 @@ LSM_HOOK(void, LSM_RET_VOID, bpf_prog_free_security, struct bpf_prog_aux *aux) + #endif /* CONFIG_BPF_SYSCALL */ + + LSM_HOOK(int, 0, locked_down, enum lockdown_reason what) ++LSM_HOOK(int, 0, lock_kernel_down, const char *where, enum lockdown_reason level) ++ + + #ifdef CONFIG_PERF_EVENTS + LSM_HOOK(int, 0, perf_event_open, struct perf_event_attr *attr, int type) +diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h +index 988ca0df7824..4ed37b95417c 100644 +--- a/include/linux/lsm_hooks.h ++++ b/include/linux/lsm_hooks.h +@@ -1476,6 +1476,12 @@ + * + * @what: kernel feature being accessed + * ++ * @lock_kernel_down ++ * Put the kernel into lock-down mode. ++ * ++ * @where: Where the lock-down is originating from (e.g. command line option) ++ * @level: The lock-down level (can only increase) ++ * + * Security hooks for perf events + * + * @perf_event_open: +diff --git a/include/linux/security.h b/include/linux/security.h +index a8d9310472df..381305889d89 100644 +--- a/include/linux/security.h ++++ b/include/linux/security.h +@@ -446,6 +446,7 @@ int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen); + int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen); + int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen); + int security_locked_down(enum lockdown_reason what); ++int security_lock_kernel_down(const char *where, enum lockdown_reason level); + #else /* CONFIG_SECURITY */ + + static inline int call_blocking_lsm_notifier(enum lsm_event event, void *data) +@@ -1273,6 +1274,10 @@ static inline int security_locked_down(enum lockdown_reason what) + { + return 0; + } ++static inline int security_lock_kernel_down(const char *where, enum lockdown_reason level) ++{ ++ return 0; ++} + #endif /* CONFIG_SECURITY */ + + #ifdef CONFIG_SECURITY_NETWORK +diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c +index 5a952617a0eb..61cc3cdc4d25 100644 +--- a/security/lockdown/lockdown.c ++++ b/security/lockdown/lockdown.c +@@ -73,6 +73,7 @@ static int lockdown_is_locked_down(enum lockdown_reason what) + + static struct security_hook_list lockdown_hooks[] __lsm_ro_after_init = { + LSM_HOOK_INIT(locked_down, lockdown_is_locked_down), ++ LSM_HOOK_INIT(lock_kernel_down, lock_kernel_down), + }; + + static int __init lockdown_lsm_init(void) +diff --git a/security/security.c b/security/security.c +index 51de970fbb1e..48d05f8067f2 100644 +--- a/security/security.c ++++ b/security/security.c +@@ -2468,6 +2468,12 @@ int security_locked_down(enum lockdown_reason what) + } + EXPORT_SYMBOL(security_locked_down); + ++int security_lock_kernel_down(const char *where, enum lockdown_reason level) ++{ ++ return call_int_hook(lock_kernel_down, 0, where, level); ++} ++EXPORT_SYMBOL(security_lock_kernel_down); ++ + #ifdef CONFIG_PERF_EVENTS + int security_perf_event_open(struct perf_event_attr *attr, int type) + { +-- +2.26.2 + |