From 71c4fb133b496d62539dd32dc3d377f861f067f2 Mon Sep 17 00:00:00 2001 From: Captain ALM Date: Sat, 25 May 2024 17:55:24 +0100 Subject: [PATCH] Hibernate Patch. --- Documentation/admin-guide/kernel-parameters.txt | 5 +++++ kernel/power/hibernate.c | 11 +++++++++-- 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a1b25a735..71b537ea6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2684,6 +2684,11 @@ to extract confidential information from the kernel are also disabled. + lockdown_hibernate [HIBERNATION] + Enable hibernation even if lockdown is enabled. Enable this only if + your swap is encrypted and secured properly, as an attacker can + modify the kernel offline during hibernation. + locktorture.nreaders_stress= [KNL] Set the number of locking read-acquisition kthreads. Defaults to being automatically set based on the diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 9abc73d50..25c3a8fa6 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -36,7 +36,7 @@ #include "power.h" - +static int lockdown_hibernate; static int nocompress; static int noresume; static int nohibernate; @@ -83,7 +83,7 @@ void hibernate_release(void) bool hibernation_available(void) { return nohibernate == 0 && - !security_locked_down(LOCKDOWN_HIBERNATION) && + (lockdown_hibernate || !security_locked_down(LOCKDOWN_HIBERNATION)) && !secretmem_active(); } @@ -1337,6 +1337,12 @@ static int __init nohibernate_setup(char *str) return 1; } +static int __init lockdown_hibernate_setup(char *str) +{ + lockdown_hibernate = 1; + return 1; +} + __setup("noresume", noresume_setup); __setup("resume_offset=", resume_offset_setup); __setup("resume=", resume_setup); @@ -1344,3 +1350,4 @@ __setup("hibernate=", hibernate_setup); __setup("resumewait", resumewait_setup); __setup("resumedelay=", resumedelay_setup); __setup("nohibernate", nohibernate_setup); +__setup("lockdown_hibernate", lockdown_hibernate_setup); -- 2.34.1