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Message-Id: <20250120-of-address-overflow-v1-2-dd68dbf47bce@linutronix.de>
Date: Mon, 20 Jan 2025 15:09:41 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>
Cc: Basharath Hussain Khaja <basharath@...thit.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 2/2] of: address: Add kunit test for
__of_address_resource_bounds()
The overflow checking has to deal with different datatypes and
edgecases. Add a new kunit testcase to make sure it works correctly.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Technically it's possible to run this unittest with !CONFIG_OF_ADDRESS,
so there is an explicit check inside the test.
It would also be possible to add a dedicated source file, but that
seemed like a lot of churn to me.
---
drivers/of/address.c | 5 +-
drivers/of/of_private.h | 4 ++
drivers/of/of_test.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 127 insertions(+), 2 deletions(-)
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 5c0663066a7f3816a05077f99124ca25e3c152d7..84b8d16919dc4aae966a09f7fe0606b2e51c3dde 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -16,6 +16,8 @@
#include <linux/string.h>
#include <linux/dma-direct.h> /* for bus_dma_region */
+#include <kunit/visibility.h>
+
#include "of_private.h"
/* Max address size we deal with */
@@ -198,7 +200,7 @@ static u64 of_bus_pci_map(__be32 *addr, const __be32 *range, int na, int ns,
#endif /* CONFIG_PCI */
-static int __of_address_resource_bounds(struct resource *r, u64 start, u64 size)
+VISIBLE_IF_KUNIT int __of_address_resource_bounds(struct resource *r, u64 start, u64 size)
{
if (overflows_type(start, r->start))
return -EOVERFLOW;
@@ -212,6 +214,7 @@ static int __of_address_resource_bounds(struct resource *r, u64 start, u64 size)
return 0;
}
+EXPORT_SYMBOL_IF_KUNIT(__of_address_resource_bounds);
/*
* of_pci_range_to_resource - Create a resource from an of_pci_range
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index ea5a0951ec5e107bab265ab5f6c043e2bfb15ecc..0d29d71ac7c62ae91bfac0c8d1518622729575cd 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -188,4 +188,8 @@ void __init fdt_scan_reserved_mem_reg_nodes(void);
bool of_fdt_device_is_available(const void *blob, unsigned long node);
+#if IS_ENABLED(CONFIG_KUNIT)
+int __of_address_resource_bounds(struct resource *r, u64 start, u64 size);
+#endif
+
#endif /* _LINUX_OF_PRIVATE_H */
diff --git a/drivers/of/of_test.c b/drivers/of/of_test.c
index b0557ded838fdf70f0b679c31ead38f501371304..b8eb1d4b76fdf3a16fc5dd24f8e6ed0c3fca5e9c 100644
--- a/drivers/of/of_test.c
+++ b/drivers/of/of_test.c
@@ -2,6 +2,7 @@
/*
* KUnit tests for OF APIs
*/
+#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -54,8 +55,125 @@ static struct kunit_suite of_dtb_suite = {
.init = of_dtb_test_init,
};
+struct of_address_resource_bounds_case {
+ u64 start;
+ u64 size;
+ int ret;
+
+ resource_size_t res_start;
+ resource_size_t res_end;
+};
+
+static void of_address_resource_bounds_case_desc(const struct of_address_resource_bounds_case *p,
+ char *name)
+{
+ snprintf(name, KUNIT_PARAM_DESC_SIZE, "start=0x%016llx,size=0x%016llx", p->start, p->size);
+}
+
+static const struct of_address_resource_bounds_case of_address_resource_bounds_cases[] = {
+ {
+ .start = 0,
+ .size = 0,
+ .ret = 0,
+ .res_start = 0,
+ .res_end = -1,
+ },
+ {
+ .start = 0,
+ .size = 0x1000,
+ .ret = 0,
+ .res_start = 0,
+ .res_end = 0xfff,
+ },
+ {
+ .start = 0x1000,
+ .size = 0,
+ .ret = 0,
+ .res_start = 0x1000,
+ .res_end = 0xfff,
+ },
+ {
+ .start = 0x1000,
+ .size = 0x1000,
+ .ret = 0,
+ .res_start = 0x1000,
+ .res_end = 0x1fff,
+ },
+ {
+ .start = 1,
+ .size = RESOURCE_SIZE_MAX,
+ .ret = 0,
+ .res_start = 1,
+ .res_end = RESOURCE_SIZE_MAX,
+ },
+ {
+ .start = RESOURCE_SIZE_MAX,
+ .size = 1,
+ .ret = 0,
+ .res_start = RESOURCE_SIZE_MAX,
+ .res_end = RESOURCE_SIZE_MAX,
+ },
+ {
+ .start = 2,
+ .size = RESOURCE_SIZE_MAX,
+ .ret = -EOVERFLOW,
+ },
+ {
+ .start = RESOURCE_SIZE_MAX,
+ .size = 2,
+ .ret = -EOVERFLOW,
+ },
+ {
+ .start = 0x100000000ULL,
+ .size = 1,
+ .ret = sizeof(resource_size_t) > sizeof(u32) ? 0 : -EOVERFLOW,
+ .res_start = (resource_size_t)0x100000000,
+ .res_end = (resource_size_t)0x100000000,
+ },
+ {
+ .start = 0x1000,
+ .size = 0xffffffff,
+ .ret = sizeof(resource_size_t) > sizeof(u32) ? 0 : -EOVERFLOW,
+ .res_start = (resource_size_t)0x1000,
+ .res_end = (resource_size_t)0x100000ffe,
+ },
+};
+
+KUNIT_ARRAY_PARAM(of_address_resource_bounds,
+ of_address_resource_bounds_cases, of_address_resource_bounds_case_desc);
+
+static void of_address_resource_bounds(struct kunit *test)
+{
+ const struct of_address_resource_bounds_case *param;
+ struct resource r; /* Intentionally uninitialized */
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_OF_ADDRESS))
+ kunit_skip(test, "CONFIG_OF_ADDRESS not enabled\n");
+
+ param = test->param_value;
+
+ ret = __of_address_resource_bounds(&r, param->start, param->size);
+ KUNIT_EXPECT_EQ(test, param->ret, ret);
+ if (ret == 0) {
+ KUNIT_EXPECT_EQ(test, param->res_start, r.start);
+ KUNIT_EXPECT_EQ(test, param->res_end, r.end);
+ KUNIT_EXPECT_EQ(test, param->size, resource_size(&r));
+ }
+}
+
+static struct kunit_case of_address_test_cases[] = {
+ KUNIT_CASE_PARAM(of_address_resource_bounds, of_address_resource_bounds_gen_params),
+ {}
+};
+
+static struct kunit_suite of_address_suite = {
+ .name = "of_address",
+ .test_cases = of_address_test_cases,
+};
+
kunit_test_suites(
- &of_dtb_suite,
+ &of_dtb_suite, &of_address_suite,
);
MODULE_DESCRIPTION("KUnit tests for OF APIs");
MODULE_LICENSE("GPL");
--
2.48.1
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