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authorDomenico Andreoli <domenico.andreoli@linux.com>2020-05-07 09:19:53 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-05-19 17:48:08 +0200
commitc4f39a6c74389fcc93ac39056ef342f32ab57a23 (patch)
tree59060a6eeb86e2c22f3c681afc0beabdfa935a72
parentab7e9b067f3d9cbec28cfca51d341efb421b7a51 (diff)
PM: hibernate: Split off snapshot dev option
Make it possible to reduce the attack surface in case the snapshot device is not to be used from userspace. Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--kernel/power/Kconfig12
-rw-r--r--kernel/power/Makefile3
2 files changed, 14 insertions, 1 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index c208566c844b..4d0e6e815a2b 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -80,6 +80,18 @@ config HIBERNATION
For more information take a look at <file:Documentation/power/swsusp.rst>.
+config HIBERNATION_SNAPSHOT_DEV
+ bool "Userspace snapshot device"
+ depends on HIBERNATION
+ default y
+ ---help---
+ Device used by the uswsusp tools.
+
+ Say N if no snapshotting from userspace is needed, this also
+ reduces the attack surface of the kernel.
+
+ If in doubt, say Y.
+
config PM_STD_PARTITION
string "Default resume partition"
depends on HIBERNATION
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index e7e47d9be1e5..5899260a8bef 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -10,7 +10,8 @@ obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o
obj-$(CONFIG_FREEZER) += process.o
obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
-obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o
+obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o
+obj-$(CONFIG_HIBERNATION_SNAPSHOT_DEV) += user.o
obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o