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path: root/lib/livepatch/test_klp_shadow_vars.c
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Diffstat (limited to 'lib/livepatch/test_klp_shadow_vars.c')
-rw-r--r--lib/livepatch/test_klp_shadow_vars.c119
1 files changed, 69 insertions, 50 deletions
diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c
index fe5c413efe96..f0b5a1d24e55 100644
--- a/lib/livepatch/test_klp_shadow_vars.c
+++ b/lib/livepatch/test_klp_shadow_vars.c
@@ -60,36 +60,43 @@ static int ptr_id(void *ptr)
*/
static void *shadow_get(void *obj, unsigned long id)
{
- void *ret = klp_shadow_get(obj, id);
+ int **sv;
+ sv = klp_shadow_get(obj, id);
pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
- __func__, ptr_id(obj), id, ptr_id(ret));
+ __func__, ptr_id(obj), id, ptr_id(sv));
- return ret;
+ return sv;
}
static void *shadow_alloc(void *obj, unsigned long id, size_t size,
gfp_t gfp_flags, klp_shadow_ctor_t ctor,
void *ctor_data)
{
- void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor,
- ctor_data);
+ int **var = ctor_data;
+ int **sv;
+
+ sv = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, var);
pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
- ptr_id(ctor_data), ptr_id(ret));
- return ret;
+ ptr_id(*var), ptr_id(sv));
+
+ return sv;
}
static void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
gfp_t gfp_flags, klp_shadow_ctor_t ctor,
void *ctor_data)
{
- void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor,
- ctor_data);
+ int **var = ctor_data;
+ int **sv;
+
+ sv = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, var);
pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
- ptr_id(ctor_data), ptr_id(ret));
- return ret;
+ ptr_id(*var), ptr_id(sv));
+
+ return sv;
}
static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
@@ -110,58 +117,70 @@ static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
/* Shadow variable constructor - remember simple pointer data */
static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
{
- int **shadow_int = shadow_data;
- *shadow_int = ctor_data;
+ int **sv = shadow_data;
+ int **var = ctor_data;
+
+ if (!var)
+ return -EINVAL;
+
+ *sv = *var;
pr_info("%s: PTR%d -> PTR%d\n",
- __func__, ptr_id(shadow_int), ptr_id(ctor_data));
+ __func__, ptr_id(sv), ptr_id(*var));
return 0;
}
static void shadow_dtor(void *obj, void *shadow_data)
{
+ int **sv = shadow_data;
+
pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
- __func__, ptr_id(obj), ptr_id(shadow_data));
+ __func__, ptr_id(obj), ptr_id(sv));
}
static int test_klp_shadow_vars_init(void)
{
void *obj = THIS_MODULE;
int id = 0x1234;
- size_t size = sizeof(int *);
gfp_t gfp_flags = GFP_KERNEL;
int var1, var2, var3, var4;
+ int *pv1, *pv2, *pv3, *pv4;
int **sv1, **sv2, **sv3, **sv4;
- void *ret;
+ int **sv;
+
+ pv1 = &var1;
+ pv2 = &var2;
+ pv3 = &var3;
+ pv4 = &var4;
ptr_id(NULL);
- ptr_id(&var1);
- ptr_id(&var2);
- ptr_id(&var3);
- ptr_id(&var4);
+ ptr_id(pv1);
+ ptr_id(pv2);
+ ptr_id(pv3);
+ ptr_id(pv4);
/*
* With an empty shadow variable hash table, expect not to find
* any matches.
*/
- ret = shadow_get(obj, id);
- if (!ret)
+ sv = shadow_get(obj, id);
+ if (!sv)
pr_info(" got expected NULL result\n");
/*
* Allocate a few shadow variables with different <obj> and <id>.
*/
- sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
+ sv1 = shadow_alloc(obj, id, sizeof(pv1), gfp_flags, shadow_ctor, &pv1);
if (!sv1)
return -ENOMEM;
- sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
+ sv2 = shadow_alloc(obj + 1, id, sizeof(pv2), gfp_flags, shadow_ctor, &pv2);
if (!sv2)
return -ENOMEM;
- sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
+ sv3 = shadow_alloc(obj, id + 1, sizeof(pv3), gfp_flags, shadow_ctor, &pv3);
if (!sv3)
return -ENOMEM;
@@ -169,23 +188,23 @@ static int test_klp_shadow_vars_init(void)
* Verify we can find our new shadow variables and that they point
* to expected data.
*/
- ret = shadow_get(obj, id);
- if (!ret)
+ sv = shadow_get(obj, id);
+ if (!sv)
return -EINVAL;
- if (ret == sv1 && *sv1 == &var1)
+ if (sv == sv1 && *sv1 == pv1)
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv1), ptr_id(*sv1));
- ret = shadow_get(obj + 1, id);
- if (!ret)
+ sv = shadow_get(obj + 1, id);
+ if (!sv)
return -EINVAL;
- if (ret == sv2 && *sv2 == &var2)
+ if (sv == sv2 && *sv2 == pv2)
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv2), ptr_id(*sv2));
- ret = shadow_get(obj, id + 1);
- if (!ret)
+ sv = shadow_get(obj, id + 1);
+ if (!sv)
return -EINVAL;
- if (ret == sv3 && *sv3 == &var3)
+ if (sv == sv3 && *sv3 == pv3)
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv3), ptr_id(*sv3));
@@ -193,14 +212,14 @@ static int test_klp_shadow_vars_init(void)
* Allocate or get a few more, this time with the same <obj>, <id>.
* The second invocation should return the same shadow var.
*/
- sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+ sv4 = shadow_get_or_alloc(obj + 2, id, sizeof(pv4), gfp_flags, shadow_ctor, &pv4);
if (!sv4)
return -ENOMEM;
- ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
- if (!ret)
+ sv = shadow_get_or_alloc(obj + 2, id, sizeof(pv4), gfp_flags, shadow_ctor, &pv4);
+ if (!sv)
return -EINVAL;
- if (ret == sv4 && *sv4 == &var4)
+ if (sv == sv4 && *sv4 == pv4)
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv4), ptr_id(*sv4));
@@ -209,27 +228,27 @@ static int test_klp_shadow_vars_init(void)
* longer find them.
*/
shadow_free(obj, id, shadow_dtor); /* sv1 */
- ret = shadow_get(obj, id);
- if (!ret)
+ sv = shadow_get(obj, id);
+ if (!sv)
pr_info(" got expected NULL result\n");
shadow_free(obj + 1, id, shadow_dtor); /* sv2 */
- ret = shadow_get(obj + 1, id);
- if (!ret)
+ sv = shadow_get(obj + 1, id);
+ if (!sv)
pr_info(" got expected NULL result\n");
shadow_free(obj + 2, id, shadow_dtor); /* sv4 */
- ret = shadow_get(obj + 2, id);
- if (!ret)
+ sv = shadow_get(obj + 2, id);
+ if (!sv)
pr_info(" got expected NULL result\n");
/*
* We should still find an <id+1> variable.
*/
- ret = shadow_get(obj, id + 1);
- if (!ret)
+ sv = shadow_get(obj, id + 1);
+ if (!sv)
return -EINVAL;
- if (ret == sv3 && *sv3 == &var3)
+ if (sv == sv3 && *sv3 == pv3)
pr_info(" got expected PTR%d -> PTR%d result\n",
ptr_id(sv3), ptr_id(*sv3));
@@ -237,8 +256,8 @@ static int test_klp_shadow_vars_init(void)
* Free all the <id+1> variables, too.
*/
shadow_free_all(id + 1, shadow_dtor); /* sv3 */
- ret = shadow_get(obj, id);
- if (!ret)
+ sv = shadow_get(obj, id);
+ if (!sv)
pr_info(" shadow_get() got expected NULL result\n");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.