sysctl: move the extra1/2 boundary check of u8 to sysctl_check_table_array

Move boundary checking for proc_dou8ved_minmax into module loading, thereby
reporting errors in advance. And add a kunit test case ensuring the
boundary check is done correctly.

The boundary check in proc_dou8vec_minmax done to the extra elements in
the ctl_table struct is currently performed at runtime. This allows buggy
kernel modules to be loaded normally without any errors only to fail
when used.

This is a buggy example module:
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/sysctl.h>

	static struct ctl_table_header *_table_header = NULL;
	static unsigned char _data = 0;
	struct ctl_table table[] = {
		{
			.procname       = "foo",
			.data           = &_data,
			.maxlen         = sizeof(u8),
			.mode           = 0644,
			.proc_handler   = proc_dou8vec_minmax,
			.extra1         = SYSCTL_ZERO,
			.extra2         = SYSCTL_ONE_THOUSAND,
		},
	};

	static int init_demo(void) {
		_table_header = register_sysctl("kernel", table);
		if (!_table_header)
			return -ENOMEM;

		return 0;
	}

	module_init(init_demo);
	MODULE_LICENSE("GPL");

And this is the result:
        # insmod test.ko
        # cat /proc/sys/kernel/foo
        cat: /proc/sys/kernel/foo: Invalid argument

Suggested-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: Wen Yang <wen.yang@linux.dev>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Joel Granados <j.granados@samsung.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: Joel Granados <j.granados@samsung.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/kernel/sysctl-test.c b/kernel/sysctl-test.c
index 6ef887c19c48..4e7dcc9187e2 100644
--- a/kernel/sysctl-test.c
+++ b/kernel/sysctl-test.c
@@ -367,6 +367,54 @@ static void sysctl_test_api_dointvec_write_single_greater_int_max(
 	KUNIT_EXPECT_EQ(test, 0, *((int *)table.data));
 }
 
+/*
+ * Test that registering an invalid extra value is not allowed.
+ */
+static void sysctl_test_register_sysctl_sz_invalid_extra_value(
+		struct kunit *test)
+{
+	unsigned char data = 0;
+	struct ctl_table table_foo[] = {
+		{
+			.procname	= "foo",
+			.data		= &data,
+			.maxlen		= sizeof(u8),
+			.mode		= 0644,
+			.proc_handler	= proc_dou8vec_minmax,
+			.extra1		= SYSCTL_FOUR,
+			.extra2		= SYSCTL_ONE_THOUSAND,
+		},
+	};
+
+	struct ctl_table table_bar[] = {
+		{
+			.procname	= "bar",
+			.data		= &data,
+			.maxlen		= sizeof(u8),
+			.mode		= 0644,
+			.proc_handler	= proc_dou8vec_minmax,
+			.extra1		= SYSCTL_NEG_ONE,
+			.extra2		= SYSCTL_ONE_HUNDRED,
+		},
+	};
+
+	struct ctl_table table_qux[] = {
+		{
+			.procname	= "qux",
+			.data		= &data,
+			.maxlen		= sizeof(u8),
+			.mode		= 0644,
+			.proc_handler	= proc_dou8vec_minmax,
+			.extra1		= SYSCTL_ZERO,
+			.extra2		= SYSCTL_TWO_HUNDRED,
+		},
+	};
+
+	KUNIT_EXPECT_NULL(test, register_sysctl("foo", table_foo));
+	KUNIT_EXPECT_NULL(test, register_sysctl("foo", table_bar));
+	KUNIT_EXPECT_NOT_NULL(test, register_sysctl("foo", table_qux));
+}
+
 static struct kunit_case sysctl_test_cases[] = {
 	KUNIT_CASE(sysctl_test_api_dointvec_null_tbl_data),
 	KUNIT_CASE(sysctl_test_api_dointvec_table_maxlen_unset),
@@ -378,6 +426,7 @@ static struct kunit_case sysctl_test_cases[] = {
 	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_negative),
 	KUNIT_CASE(sysctl_test_api_dointvec_write_single_less_int_min),
 	KUNIT_CASE(sysctl_test_api_dointvec_write_single_greater_int_max),
+	KUNIT_CASE(sysctl_test_register_sysctl_sz_invalid_extra_value),
 	{}
 };