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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-10 02:12:10 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-10 02:12:10 +0200
commit4c0b6c10fbaf0c82efe2a7ba6c236c633d4f2ed7 (patch)
treeba2727168486504a256694aaa5f549bac1aa92eb /Documentation/kernel-parameters.txt
parentd5f32af3100165cbd625855bd155b3aa9bd87ebf (diff)
downloadlinux-aarch64-4c0b6c10fbaf0c82efe2a7ba6c236c633d4f2ed7.tar.gz
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 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 82b42c958d1c..07960c24642d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3594,6 +3594,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
present during boot.
nocompress Don't compress/decompress hibernation images.
no Disable hibernation and resume.
+ protect_image Turn on image protection during restoration
+ (that will set all pages holding image data
+ during restoration read-only).
retain_initrd [RAM] Keep initrd memory after extraction