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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-10 03:12:10 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-10 03:12:10 +0300
commit4c0b6c10fbaf0c82efe2a7ba6c236c633d4f2ed7 (patch)
treeba2727168486504a256694aaa5f549bac1aa92eb /kernel/power/hibernate.c
parentd5f32af3100165cbd625855bd155b3aa9bd87ebf (diff)
downloadlinux-4c0b6c10fbaf0c82efe2a7ba6c236c633d4f2ed7.tar.xz
PM / hibernate: Image data protection during restoration
Make it possible to protect all pages holding image data during hibernate image restoration by setting them read-only (so as to catch attempts to write to those pages after image data have been stored in them). This adds overhead to image restoration code (it may cause large page mappings to be split as a result of page flags changes) and the errors it protects against should never happen in theory, so the feature is only active after passing hibernate=protect_image to the command line of the restore kernel. Also it only is built if CONFIG_DEBUG_RODATA is set. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power/hibernate.c')
-rw-r--r--kernel/power/hibernate.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b00f270d328e..51441d87f0b6 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -1126,6 +1126,9 @@ static int __init hibernate_setup(char *str)
} else if (!strncmp(str, "no", 2)) {
noresume = 1;
nohibernate = 1;
+ } else if (IS_ENABLED(CONFIG_DEBUG_RODATA)
+ && !strncmp(str, "protect_image", 13)) {
+ enable_restore_image_protection();
}
return 1;
}