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Diffstat (limited to 'lib/livepatch/test_klp_shadow_vars.c')
-rw-r--r--lib/livepatch/test_klp_shadow_vars.c277
1 files changed, 0 insertions, 277 deletions
diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c
deleted file mode 100644
index f0b5a1d24e55..000000000000
--- a/lib/livepatch/test_klp_shadow_vars.c
+++ /dev/null
@@ -1,277 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/livepatch.h>
-#include <linux/slab.h>
-
-/*
- * Keep a small list of pointers so that we can print address-agnostic
- * pointer values. Use a rolling integer count to differentiate the values.
- * Ironically we could have used the shadow variable API to do this, but
- * let's not lean too heavily on the very code we're testing.
- */
-static LIST_HEAD(ptr_list);
-struct shadow_ptr {
- void *ptr;
- int id;
- struct list_head list;
-};
-
-static void free_ptr_list(void)
-{
- struct shadow_ptr *sp, *tmp_sp;
-
- list_for_each_entry_safe(sp, tmp_sp, &ptr_list, list) {
- list_del(&sp->list);
- kfree(sp);
- }
-}
-
-static int ptr_id(void *ptr)
-{
- struct shadow_ptr *sp;
- static int count;
-
- list_for_each_entry(sp, &ptr_list, list) {
- if (sp->ptr == ptr)
- return sp->id;
- }
-
- sp = kmalloc(sizeof(*sp), GFP_ATOMIC);
- if (!sp)
- return -ENOMEM;
- sp->ptr = ptr;
- sp->id = count++;
-
- list_add(&sp->list, &ptr_list);
-
- return sp->id;
-}
-
-/*
- * Shadow variable wrapper functions that echo the function and arguments
- * to the kernel log for testing verification. Don't display raw pointers,
- * but use the ptr_id() value instead.
- */
-static void *shadow_get(void *obj, unsigned long 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(sv));
-
- 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)
-{
- 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(*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)
-{
- 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(*var), ptr_id(sv));
-
- return sv;
-}
-
-static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
-{
- klp_shadow_free(obj, id, dtor);
- pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
- __func__, ptr_id(obj), id, ptr_id(dtor));
-}
-
-static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
-{
- klp_shadow_free_all(id, dtor);
- pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n",
- __func__, id, ptr_id(dtor));
-}
-
-
-/* Shadow variable constructor - remember simple pointer data */
-static int shadow_ctor(void *obj, void *shadow_data, void *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(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(sv));
-}
-
-static int test_klp_shadow_vars_init(void)
-{
- void *obj = THIS_MODULE;
- int id = 0x1234;
- gfp_t gfp_flags = GFP_KERNEL;
-
- int var1, var2, var3, var4;
- int *pv1, *pv2, *pv3, *pv4;
- int **sv1, **sv2, **sv3, **sv4;
-
- int **sv;
-
- pv1 = &var1;
- pv2 = &var2;
- pv3 = &var3;
- pv4 = &var4;
-
- ptr_id(NULL);
- 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.
- */
- 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, sizeof(pv1), gfp_flags, shadow_ctor, &pv1);
- if (!sv1)
- return -ENOMEM;
-
- sv2 = shadow_alloc(obj + 1, id, sizeof(pv2), gfp_flags, shadow_ctor, &pv2);
- if (!sv2)
- return -ENOMEM;
-
- sv3 = shadow_alloc(obj, id + 1, sizeof(pv3), gfp_flags, shadow_ctor, &pv3);
- if (!sv3)
- return -ENOMEM;
-
- /*
- * Verify we can find our new shadow variables and that they point
- * to expected data.
- */
- sv = shadow_get(obj, id);
- if (!sv)
- return -EINVAL;
- if (sv == sv1 && *sv1 == pv1)
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv1), ptr_id(*sv1));
-
- sv = shadow_get(obj + 1, id);
- if (!sv)
- return -EINVAL;
- if (sv == sv2 && *sv2 == pv2)
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv2), ptr_id(*sv2));
- sv = shadow_get(obj, id + 1);
- if (!sv)
- return -EINVAL;
- if (sv == sv3 && *sv3 == pv3)
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv3), ptr_id(*sv3));
-
- /*
- * 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, sizeof(pv4), gfp_flags, shadow_ctor, &pv4);
- if (!sv4)
- return -ENOMEM;
-
- sv = shadow_get_or_alloc(obj + 2, id, sizeof(pv4), gfp_flags, shadow_ctor, &pv4);
- if (!sv)
- return -EINVAL;
- if (sv == sv4 && *sv4 == pv4)
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv4), ptr_id(*sv4));
-
- /*
- * Free the <obj=*, id> shadow variables and check that we can no
- * longer find them.
- */
- shadow_free(obj, id, shadow_dtor); /* sv1 */
- sv = shadow_get(obj, id);
- if (!sv)
- pr_info(" got expected NULL result\n");
-
- shadow_free(obj + 1, id, shadow_dtor); /* sv2 */
- sv = shadow_get(obj + 1, id);
- if (!sv)
- pr_info(" got expected NULL result\n");
-
- shadow_free(obj + 2, id, shadow_dtor); /* sv4 */
- sv = shadow_get(obj + 2, id);
- if (!sv)
- pr_info(" got expected NULL result\n");
-
- /*
- * We should still find an <id+1> variable.
- */
- sv = shadow_get(obj, id + 1);
- if (!sv)
- return -EINVAL;
- if (sv == sv3 && *sv3 == pv3)
- pr_info(" got expected PTR%d -> PTR%d result\n",
- ptr_id(sv3), ptr_id(*sv3));
-
- /*
- * Free all the <id+1> variables, too.
- */
- shadow_free_all(id + 1, shadow_dtor); /* sv3 */
- sv = shadow_get(obj, id);
- if (!sv)
- pr_info(" shadow_get() got expected NULL result\n");
-
-
- free_ptr_list();
-
- return 0;
-}
-
-static void test_klp_shadow_vars_exit(void)
-{
-}
-
-module_init(test_klp_shadow_vars_init);
-module_exit(test_klp_shadow_vars_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
-MODULE_DESCRIPTION("Livepatch test: shadow variables");
generated by cgit (git 2.34.1) at 2025-12-25 18:30:03 +0000