diff options
Diffstat (limited to 'lift-lockdown-sysrq.patch')
| -rw-r--r-- | lift-lockdown-sysrq.patch | 287 |
1 files changed, 0 insertions, 287 deletions
diff --git a/lift-lockdown-sysrq.patch b/lift-lockdown-sysrq.patch deleted file mode 100644 index b465143fb..000000000 --- a/lift-lockdown-sysrq.patch +++ /dev/null @@ -1,287 +0,0 @@ -From c2eb371cede78df9a47bf3a125aa9a45dd833da7 Mon Sep 17 00:00:00 2001 -From: Kyle McMartin <kyle@redhat.com> -Date: Mon, 9 Apr 2018 09:52:45 +0100 -Subject: [PATCH] Add a SysRq option to lift kernel lockdown - -Make an option to provide a sysrq key that will lift the kernel lockdown, -thereby allowing the running kernel image to be accessed and modified. - -On x86 this is triggered with SysRq+x, but this key may not be available on -all arches, so it is set by setting LOCKDOWN_LIFT_KEY in asm/setup.h. -Since this macro must be defined in an arch to be able to use this facility -for that arch, the Kconfig option is restricted to arches that support it. - -Signed-off-by: Kyle McMartin <kyle@redhat.com> -Signed-off-by: David Howells <dhowells@redhat.com> -cc: x86@kernel.org -Signed-off-by: Jeremy Cline <jcline@redhat.com> ---- - arch/x86/include/asm/setup.h | 2 ++ - drivers/input/misc/uinput.c | 1 + - drivers/tty/sysrq.c | 27 +++++++++++++--------- - include/linux/input.h | 5 +++++ - include/linux/sysrq.h | 8 ++++++- - kernel/debug/kdb/kdb_main.c | 2 +- - security/lockdown/Kconfig | 11 +++++++++ - security/lockdown/lockdown.c | 43 ++++++++++++++++++++++++++++++++++++ - 8 files changed, 87 insertions(+), 12 deletions(-) - -diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h -index ed8ec011a9fd..8daf633a5347 100644 ---- a/arch/x86/include/asm/setup.h -+++ b/arch/x86/include/asm/setup.h -@@ -9,6 +9,8 @@ - #include <linux/linkage.h> - #include <asm/page_types.h> - -+#define LOCKDOWN_LIFT_KEY 'x' -+ - #ifdef __i386__ - - #include <linux/pfn.h> -diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c -index 84051f20b18a..583ab2bc1916 100644 ---- a/drivers/input/misc/uinput.c -+++ b/drivers/input/misc/uinput.c -@@ -353,6 +353,7 @@ static int uinput_create_device(struct uinput_device *udev) - dev->flush = uinput_dev_flush; - } - -+ dev->flags |= INPUTDEV_FLAGS_SYNTHETIC; - dev->event = uinput_dev_event; - - input_set_drvdata(udev->dev, udev); -diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c -index 573b2055173c..99082faafc44 100644 ---- a/drivers/tty/sysrq.c -+++ b/drivers/tty/sysrq.c -@@ -480,6 +480,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = { - /* x: May be registered on mips for TLB dump */ - /* x: May be registered on ppc/powerpc for xmon */ - /* x: May be registered on sparc64 for global PMU dump */ -+ /* x: May be registered on x86_64 for disabling secure boot */ - NULL, /* x */ - /* y: May be registered on sparc64 for global register dump */ - NULL, /* y */ -@@ -523,7 +524,7 @@ static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p) - sysrq_key_table[i] = op_p; - } - --void __handle_sysrq(int key, bool check_mask) -+void __handle_sysrq(int key, unsigned int from) - { - struct sysrq_key_op *op_p; - int orig_log_level; -@@ -546,11 +547,15 @@ void __handle_sysrq(int key, bool check_mask) - - op_p = __sysrq_get_key_op(key); - if (op_p) { -- /* -- * Should we check for enabled operations (/proc/sysrq-trigger -- * should not) and is the invoked operation enabled? -- */ -- if (!check_mask || sysrq_on_mask(op_p->enable_mask)) { -+ /* Ban synthetic events from some sysrq functionality */ -+ if ((from == SYSRQ_FROM_PROC || from == SYSRQ_FROM_SYNTHETIC) && -+ op_p->enable_mask & SYSRQ_DISABLE_USERSPACE) { -+ printk("This sysrq operation is disabled from userspace.\n"); -+ } else if (from == SYSRQ_FROM_KERNEL || sysrq_on_mask(op_p->enable_mask)) { -+ /* -+ * Should we check for enabled operations (/proc/sysrq-trigger -+ * should not) and is the invoked operation enabled? -+ */ - pr_info("%s\n", op_p->action_msg); - console_loglevel = orig_log_level; - op_p->handler(key); -@@ -585,7 +590,7 @@ void __handle_sysrq(int key, bool check_mask) - void handle_sysrq(int key) - { - if (sysrq_on()) -- __handle_sysrq(key, true); -+ __handle_sysrq(key, SYSRQ_FROM_KERNEL); - } - EXPORT_SYMBOL(handle_sysrq); - -@@ -665,7 +670,7 @@ static void sysrq_do_reset(struct timer_list *t) - static void sysrq_handle_reset_request(struct sysrq_state *state) - { - if (state->reset_requested) -- __handle_sysrq(sysrq_xlate[KEY_B], false); -+ __handle_sysrq(sysrq_xlate[KEY_B], SYSRQ_FROM_KERNEL); - - if (sysrq_reset_downtime_ms) - mod_timer(&state->keyreset_timer, -@@ -818,8 +823,10 @@ static bool sysrq_handle_keypress(struct sysrq_state *sysrq, - - default: - if (sysrq->active && value && value != 2) { -+ int from = sysrq->handle.dev->flags & INPUTDEV_FLAGS_SYNTHETIC ? -+ SYSRQ_FROM_SYNTHETIC : 0; - sysrq->need_reinject = false; -- __handle_sysrq(sysrq_xlate[code], true); -+ __handle_sysrq(sysrq_xlate[code], from); - } - break; - } -@@ -1102,7 +1109,7 @@ static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf, - - if (get_user(c, buf)) - return -EFAULT; -- __handle_sysrq(c, false); -+ __handle_sysrq(c, SYSRQ_FROM_PROC); - } - - return count; -diff --git a/include/linux/input.h b/include/linux/input.h -index 94f277cd806a..8539afa2c001 100644 ---- a/include/linux/input.h -+++ b/include/linux/input.h -@@ -48,6 +48,7 @@ enum input_clock_type { - * @phys: physical path to the device in the system hierarchy - * @uniq: unique identification code for the device (if device has it) - * @id: id of the device (struct input_id) -+ * @flags: input device flags (SYNTHETIC, etc.) - * @propbit: bitmap of device properties and quirks - * @evbit: bitmap of types of events supported by the device (EV_KEY, - * EV_REL, etc.) -@@ -134,6 +135,8 @@ struct input_dev { - const char *uniq; - struct input_id id; - -+ unsigned int flags; -+ - unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)]; - - unsigned long evbit[BITS_TO_LONGS(EV_CNT)]; -@@ -204,6 +207,8 @@ struct input_dev { - }; - #define to_input_dev(d) container_of(d, struct input_dev, dev) - -+#define INPUTDEV_FLAGS_SYNTHETIC 0x000000001 -+ - /* - * Verify that we are in sync with input_device_id mod_devicetable.h #defines - */ -diff --git a/include/linux/sysrq.h b/include/linux/sysrq.h -index 8c71874e8485..7de1f08b60a9 100644 ---- a/include/linux/sysrq.h -+++ b/include/linux/sysrq.h -@@ -29,6 +29,8 @@ - #define SYSRQ_ENABLE_BOOT 0x0080 - #define SYSRQ_ENABLE_RTNICE 0x0100 - -+#define SYSRQ_DISABLE_USERSPACE 0x00010000 -+ - struct sysrq_key_op { - void (*handler)(int); - char *help_msg; -@@ -43,8 +45,12 @@ struct sysrq_key_op { - * are available -- else NULL's). - */ - -+#define SYSRQ_FROM_KERNEL 0x0001 -+#define SYSRQ_FROM_PROC 0x0002 -+#define SYSRQ_FROM_SYNTHETIC 0x0004 -+ - void handle_sysrq(int key); --void __handle_sysrq(int key, bool check_mask); -+void __handle_sysrq(int key, unsigned int from); - int register_sysrq_key(int key, struct sysrq_key_op *op); - int unregister_sysrq_key(int key, struct sysrq_key_op *op); - struct sysrq_key_op *__sysrq_get_key_op(int key); -diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c -index 4567fe998c30..d05142ef44c4 100644 ---- a/kernel/debug/kdb/kdb_main.c -+++ b/kernel/debug/kdb/kdb_main.c -@@ -1981,7 +1981,7 @@ static int kdb_sr(int argc, const char **argv) - return KDB_ARGCOUNT; - - kdb_trap_printk++; -- __handle_sysrq(*argv[1], check_mask); -+ __handle_sysrq(*argv[1], check_mask ? SYSRQ_FROM_KERNEL : 0); - kdb_trap_printk--; - - return 0; -diff --git a/security/lockdown/Kconfig b/security/lockdown/Kconfig -index e84ddf484010..20e979178e1c 100644 ---- a/security/lockdown/Kconfig -+++ b/security/lockdown/Kconfig -@@ -45,3 +45,14 @@ config LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY - disabled. - - endchoice -+ -+config ALLOW_LOCKDOWN_LIFT_BY_SYSRQ -+ bool "Allow the kernel lockdown to be lifted by SysRq" -+ depends on SECURITY_LOCKDOWN_LSM -+ depends on !LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY -+ depends on !LOCK_DOWN_KERNEL_FORCE_INTEGRITY -+ depends on MAGIC_SYSRQ -+ depends on X86 -+ help -+ Allow setting the lockdown mode to "none" by pressing a SysRq key -+ combination on a wired keyboard. On x86, this is SysRq+x -diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c -index 8a10b43daf74..df4662257309 100644 ---- a/security/lockdown/lockdown.c -+++ b/security/lockdown/lockdown.c -@@ -13,6 +13,8 @@ - #include <linux/security.h> - #include <linux/export.h> - #include <linux/lsm_hooks.h> -+#include <linux/sysrq.h> -+#include <asm/setup.h> - - static enum lockdown_reason kernel_locked_down; - -@@ -179,6 +181,47 @@ static int __init lockdown_secfs_init(void) - return PTR_ERR_OR_ZERO(dentry); - } - -+#ifdef CONFIG_ALLOW_LOCKDOWN_LIFT_BY_SYSRQ -+ -+/* -+ * Take the kernel out of lockdown mode. -+ */ -+static void lift_kernel_lockdown(void) -+{ -+ pr_notice("Lifting lockdown\n"); -+ kernel_locked_down = LOCKDOWN_NONE; -+} -+ -+/* -+ * Allow lockdown to be lifted by pressing something like SysRq+x (and not by -+ * echoing the appropriate letter into the sysrq-trigger file). -+ */ -+static void sysrq_handle_lockdown_lift(int key) -+{ -+ if (kernel_locked_down) -+ lift_kernel_lockdown(); -+} -+ -+static struct sysrq_key_op lockdown_lift_sysrq_op = { -+ .handler = sysrq_handle_lockdown_lift, -+ .help_msg = "unSB(x)", -+ .action_msg = "Disabling Secure Boot restrictions", -+ .enable_mask = SYSRQ_DISABLE_USERSPACE, -+}; -+ -+static int __init lockdown_lift_sysrq(void) -+{ -+ if (kernel_locked_down) { -+ lockdown_lift_sysrq_op.help_msg[5] = LOCKDOWN_LIFT_KEY; -+ register_sysrq_key(LOCKDOWN_LIFT_KEY, &lockdown_lift_sysrq_op); -+ } -+ return 0; -+} -+ -+late_initcall(lockdown_lift_sysrq); -+ -+#endif /* CONFIG_ALLOW_LOCKDOWN_LIFT_BY_SYSRQ */ -+ - core_initcall(lockdown_secfs_init); - - #ifdef CONFIG_SECURITY_LOCKDOWN_LSM_EARLY --- -2.21.0 - |