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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>
This commit is contained in:
Domenico Andreoli 2020-05-07 09:19:53 +02:00 committed by Rafael J. Wysocki
parent ab7e9b067f
commit c4f39a6c74
2 changed files with 14 additions and 1 deletions
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12
kernel/power/Kconfig
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@ -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

3
kernel/power/Makefile
View File

@ -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