56 lines
1.9 KiB
Diff
56 lines
1.9 KiB
Diff
From: Matthew Garrett <matthew.garrett@nebula.com>
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Date: Wed, 8 Nov 2017 15:11:34 +0000
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Subject: [14/29] 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=2e6d31b3176ee27d216bb92a3b108f6b19d4719a
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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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Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com>
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cc: acpi4asus-user@lists.sourceforge.net
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cc: platform-driver-x86@vger.kernel.org
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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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diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
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index 48e1541dc8d4..ef5587469337 100644
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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, void *data)
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int err;
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u32 retval = -1;
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+ if (kernel_is_locked_down("Asus WMI"))
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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, void *data)
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int err;
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u32 retval = -1;
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+ if (kernel_is_locked_down("Asus WMI"))
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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, void *data)
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union acpi_object *obj;
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acpi_status status;
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+ if (kernel_is_locked_down("Asus WMI"))
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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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