51 lines
1.6 KiB
Diff
51 lines
1.6 KiB
Diff
From: Matthew Garrett <matthew.garrett@nebula.com>
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Date: Wed, 5 Apr 2017 17:40:30 +0100
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Subject: [52/61] asus-wmi: Restrict debugfs interface when the kernel is
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locked down
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Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=bfa10bc7193d6309dc8029e18fe7d844f9a3a1c0
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We have no way of validating what all of the Asus WMI methods do on a given
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machine - and there's a risk that some will allow hardware state to be
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manipulated in such a way that arbitrary code can be executed in the
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kernel, circumventing module loading restrictions. Prevent that if the
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kernel is locked down.
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Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
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Signed-off-by: David Howells <dhowells@redhat.com>
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---
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drivers/platform/x86/asus-wmi.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/drivers/platform/x86/asus-wmi.c
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+++ b/drivers/platform/x86/asus-wmi.c
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@@ -1905,6 +1905,9 @@ static int show_dsts(struct seq_file *m,
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int err;
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u32 retval = -1;
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+ if (kernel_is_locked_down())
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+ return -EPERM;
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+
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err = asus_wmi_get_devstate(asus, asus->debug.dev_id, &retval);
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if (err < 0)
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@@ -1921,6 +1924,9 @@ static int show_devs(struct seq_file *m,
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int err;
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u32 retval = -1;
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+ if (kernel_is_locked_down())
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+ return -EPERM;
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+
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err = asus_wmi_set_devstate(asus->debug.dev_id, asus->debug.ctrl_param,
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&retval);
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@@ -1945,6 +1951,9 @@ static int show_call(struct seq_file *m,
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union acpi_object *obj;
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acpi_status status;
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+ if (kernel_is_locked_down())
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+ return -EPERM;
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+
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status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
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0, asus->debug.method_id,
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&input, &output);
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