linux-kernel - [PATCH] ACPI: Only allow users with CAP_SYS_RAWIO rights to overwrite ACPI funcs at runtime

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Date:	Tue, 25 Sep 2012 17:25:11 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Len Brown <lenb@...nel.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, hpa@...or.com,
	initramfs@...r.kernel.org, robert.moore@...el.com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	yinghai@...nel.org, eric.piel@...mplin-utc.net, vojcek@...n.pl
Subject: [PATCH] ACPI: Only allow users with CAP_SYS_RAWIO rights to overwrite ACPI funcs at runtime

ACPI: Only allow users with CAP_SYS_RAWIO rights to overwrite ACPI funcs at runtime

and tab align file_operations callbacks.

Signed-off-by: Thomas Renninger <trenn@...e.de>
---
 drivers/acpi/custom_method.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c
index 5d42c24..9a0294d 100644
--- a/drivers/acpi/custom_method.c
+++ b/drivers/acpi/custom_method.c
@@ -72,9 +72,15 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf,
 	return count;
 }
 
+static int open_check_acc(struct inode *inode, struct file *filp)
+{
+	return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
+}
+
 static const struct file_operations cm_fops = {
-	.write = cm_write,
-	.llseek = default_llseek,
+	.write	= cm_write,
+	.llseek	= default_llseek,
+	.open	= open_check_acc,
 };
 
 static int __init acpi_custom_method_init(void)
--
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