104 lines
3.7 KiB
Diff
104 lines
3.7 KiB
Diff
From 9c4460884d6fd08e62cf3b50f3d5889efa9d40e9 Mon Sep 17 00:00:00 2001
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From: Jeremy Cline <jcline@redhat.com>
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Date: Mon, 30 Sep 2019 21:22:47 +0000
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Subject: [PATCH] security: lockdown: expose a hook to lock the kernel down
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In order to automatically lock down kernels running on UEFI machines
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booted in Secure Boot mode, expose the lock_kernel_down() hook.
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Upstream Status: RHEL only
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Signed-off-by: Jeremy Cline <jcline@redhat.com>
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---
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include/linux/lsm_hook_defs.h | 2 ++
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include/linux/lsm_hooks.h | 6 ++++++
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include/linux/security.h | 5 +++++
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security/lockdown/lockdown.c | 1 +
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security/security.c | 6 ++++++
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5 files changed, 20 insertions(+)
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diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
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index 9cd4455528e5..dfa09696a0e5 100644
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--- a/include/linux/lsm_hook_defs.h
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+++ b/include/linux/lsm_hook_defs.h
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@@ -371,6 +371,8 @@ LSM_HOOK(void, LSM_RET_VOID, bpf_prog_free_security, struct bpf_prog_aux *aux)
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#endif /* CONFIG_BPF_SYSCALL */
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LSM_HOOK(int, 0, locked_down, enum lockdown_reason what)
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+LSM_HOOK(int, 0, lock_kernel_down, const char *where, enum lockdown_reason level)
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+
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#ifdef CONFIG_PERF_EVENTS
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LSM_HOOK(int, 0, perf_event_open, struct perf_event_attr *attr, int type)
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diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
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index 988ca0df7824..4ed37b95417c 100644
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--- a/include/linux/lsm_hooks.h
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+++ b/include/linux/lsm_hooks.h
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@@ -1476,6 +1476,12 @@
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*
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* @what: kernel feature being accessed
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*
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+ * @lock_kernel_down
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+ * Put the kernel into lock-down mode.
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+ *
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+ * @where: Where the lock-down is originating from (e.g. command line option)
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+ * @level: The lock-down level (can only increase)
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+ *
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* Security hooks for perf events
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*
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* @perf_event_open:
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diff --git a/include/linux/security.h b/include/linux/security.h
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index a8d9310472df..381305889d89 100644
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--- a/include/linux/security.h
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+++ b/include/linux/security.h
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@@ -446,6 +446,7 @@ int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
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int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
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int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen);
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int security_locked_down(enum lockdown_reason what);
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+int security_lock_kernel_down(const char *where, enum lockdown_reason level);
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#else /* CONFIG_SECURITY */
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static inline int call_blocking_lsm_notifier(enum lsm_event event, void *data)
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@@ -1273,6 +1274,10 @@ static inline int security_locked_down(enum lockdown_reason what)
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{
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return 0;
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}
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+static inline int security_lock_kernel_down(const char *where, enum lockdown_reason level)
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+{
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+ return 0;
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+}
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#endif /* CONFIG_SECURITY */
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#ifdef CONFIG_SECURITY_NETWORK
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diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
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index 5a952617a0eb..61cc3cdc4d25 100644
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--- a/security/lockdown/lockdown.c
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+++ b/security/lockdown/lockdown.c
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@@ -73,6 +73,7 @@ static int lockdown_is_locked_down(enum lockdown_reason what)
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static struct security_hook_list lockdown_hooks[] __lsm_ro_after_init = {
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LSM_HOOK_INIT(locked_down, lockdown_is_locked_down),
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+ LSM_HOOK_INIT(lock_kernel_down, lock_kernel_down),
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};
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static int __init lockdown_lsm_init(void)
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diff --git a/security/security.c b/security/security.c
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index 7fed24b9d57e..37fab5c5d974 100644
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--- a/security/security.c
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+++ b/security/security.c
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@@ -2456,6 +2456,12 @@ int security_locked_down(enum lockdown_reason what)
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}
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EXPORT_SYMBOL(security_locked_down);
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+int security_lock_kernel_down(const char *where, enum lockdown_reason level)
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+{
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+ return call_int_hook(lock_kernel_down, 0, where, level);
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+}
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+EXPORT_SYMBOL(security_lock_kernel_down);
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+
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#ifdef CONFIG_PERF_EVENTS
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int security_perf_event_open(struct perf_event_attr *attr, int type)
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{
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--
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2.26.2
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