30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
From: Matthew Garrett <mjg59@srcf.ucam.org>
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Date: Wed, 5 Apr 2017 17:40:30 +0100
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Subject: [49/62] uswsusp: Disable when the kernel is locked down
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Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=6c773b2f00bec7cdccc1adf4a1af1afb082b78b8
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uswsusp allows a user process to dump and then restore kernel state, which
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makes it possible to modify the running kernel. Disable this if the kernel
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is locked down.
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Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
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Signed-off-by: David Howells <dhowells@redhat.com>
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---
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kernel/power/user.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/kernel/power/user.c b/kernel/power/user.c
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index 22df9f7ff672..e4b926d329b7 100644
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--- a/kernel/power/user.c
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+++ b/kernel/power/user.c
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@@ -52,6 +52,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
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if (!hibernation_available())
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return -EPERM;
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+ if (kernel_is_locked_down())
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+ return -EPERM;
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+
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lock_system_sleep();
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if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
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