[PATCH v3 12/14] reboot: Secure Launch SEXIT support on reboot paths
From: Ross Philipson <hidden>
Date: 2021-08-09 16:32:30
Also in:
linux-integrity, linux-iommu, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
If the MLE kernel is being powered off, rebooted or halted, then SEXIT must be called. Note that the SEXIT GETSEC leaf can only be called after a machine_shutdown() has been done on these paths. The machine_shutdown() is not called on a few paths like when poweroff action does not have a poweroff callback (into ACPI code) or when an emergency reset is done. In these cases, just the TXT registers are finalized but SEXIT is skipped. Signed-off-by: Ross Philipson <redacted> --- arch/x86/kernel/reboot.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index ebfb911..fe9d8cc 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c@@ -12,6 +12,7 @@ #include <linux/delay.h> #include <linux/objtool.h> #include <linux/pgtable.h> +#include <linux/slaunch.h> #include <acpi/reboot.h> #include <asm/io.h> #include <asm/apic.h>
@@ -731,6 +732,7 @@ static void native_machine_restart(char *__unused) if (!reboot_force) machine_shutdown(); + slaunch_finalize(!reboot_force); __machine_emergency_restart(0); }
@@ -741,6 +743,9 @@ static void native_machine_halt(void) tboot_shutdown(TB_SHUTDOWN_HALT); + /* SEXIT done after machine_shutdown() to meet TXT requirements */ + slaunch_finalize(1); + stop_this_cpu(NULL); }
@@ -749,8 +754,12 @@ static void native_machine_power_off(void) if (pm_power_off) { if (!reboot_force) machine_shutdown(); + slaunch_finalize(!reboot_force); pm_power_off(); + } else { + slaunch_finalize(0); } + /* A fallback in case there is no PM info available */ tboot_shutdown(TB_SHUTDOWN_HALT); }
@@ -778,6 +787,7 @@ void machine_shutdown(void) void machine_emergency_restart(void) { + slaunch_finalize(0); __machine_emergency_restart(1); }
--
1.8.3.1