mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 06:50:58 +07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
Pull livepatching updates from Jiri Kosina: "Fixes for selftests and samples for 'shadow variables' livepatching feature, from Petr Mladek" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching: livepatch: Handle allocation failure in the sample of shadow variable API livepatch/samples/selftest: Use klp_shadow_alloc() API correctly livepatch/selftest: Clean up shadow variable names and type livepatch/sample: Use the right type for the leaking data pointer
This commit is contained in:
Linus Torvalds
commit
715d128569
@ -60,36 +60,43 @@ static int ptr_id(void *ptr)
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*/
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static void *shadow_get(void *obj, unsigned long id)
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{
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void *ret = klp_shadow_get(obj, id);
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int **sv;
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sv = klp_shadow_get(obj, id);
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pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
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__func__, ptr_id(obj), id, ptr_id(ret));
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__func__, ptr_id(obj), id, ptr_id(sv));
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return ret;
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return sv;
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}
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static void *shadow_alloc(void *obj, unsigned long id, size_t size,
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gfp_t gfp_flags, klp_shadow_ctor_t ctor,
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void *ctor_data)
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{
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void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor,
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ctor_data);
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int **var = ctor_data;
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int **sv;
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sv = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, var);
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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",
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__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
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ptr_id(ctor_data), ptr_id(ret));
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return ret;
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ptr_id(*var), ptr_id(sv));
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return sv;
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}
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static void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
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gfp_t gfp_flags, klp_shadow_ctor_t ctor,
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void *ctor_data)
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{
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void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor,
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ctor_data);
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int **var = ctor_data;
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int **sv;
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sv = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, var);
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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",
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__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
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ptr_id(ctor_data), ptr_id(ret));
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return ret;
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ptr_id(*var), ptr_id(sv));
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return sv;
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}
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static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
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@ -110,58 +117,70 @@ static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
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/* Shadow variable constructor - remember simple pointer data */
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static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
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{
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int **shadow_int = shadow_data;
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*shadow_int = ctor_data;
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int **sv = shadow_data;
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int **var = ctor_data;
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if (!var)
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return -EINVAL;
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*sv = *var;
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pr_info("%s: PTR%d -> PTR%d\n",
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__func__, ptr_id(shadow_int), ptr_id(ctor_data));
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__func__, ptr_id(sv), ptr_id(*var));
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return 0;
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}
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static void shadow_dtor(void *obj, void *shadow_data)
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{
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int **sv = shadow_data;
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pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
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__func__, ptr_id(obj), ptr_id(shadow_data));
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__func__, ptr_id(obj), ptr_id(sv));
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}
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static int test_klp_shadow_vars_init(void)
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{
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void *obj = THIS_MODULE;
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int id = 0x1234;
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size_t size = sizeof(int *);
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gfp_t gfp_flags = GFP_KERNEL;
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int var1, var2, var3, var4;
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int *pv1, *pv2, *pv3, *pv4;
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int **sv1, **sv2, **sv3, **sv4;
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void *ret;
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int **sv;
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pv1 = &var1;
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pv2 = &var2;
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pv3 = &var3;
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pv4 = &var4;
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ptr_id(NULL);
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ptr_id(&var1);
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ptr_id(&var2);
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ptr_id(&var3);
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ptr_id(&var4);
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ptr_id(pv1);
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ptr_id(pv2);
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ptr_id(pv3);
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ptr_id(pv4);
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/*
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* With an empty shadow variable hash table, expect not to find
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* any matches.
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*/
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ret = shadow_get(obj, id);
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if (!ret)
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sv = shadow_get(obj, id);
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if (!sv)
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pr_info(" got expected NULL result\n");
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/*
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* Allocate a few shadow variables with different <obj> and <id>.
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*/
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sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
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sv1 = shadow_alloc(obj, id, sizeof(pv1), gfp_flags, shadow_ctor, &pv1);
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if (!sv1)
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return -ENOMEM;
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sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
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sv2 = shadow_alloc(obj + 1, id, sizeof(pv2), gfp_flags, shadow_ctor, &pv2);
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if (!sv2)
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return -ENOMEM;
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sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
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sv3 = shadow_alloc(obj, id + 1, sizeof(pv3), gfp_flags, shadow_ctor, &pv3);
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if (!sv3)
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return -ENOMEM;
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@ -169,23 +188,23 @@ static int test_klp_shadow_vars_init(void)
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* Verify we can find our new shadow variables and that they point
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* to expected data.
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*/
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ret = shadow_get(obj, id);
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if (!ret)
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sv = shadow_get(obj, id);
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if (!sv)
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return -EINVAL;
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if (ret == sv1 && *sv1 == &var1)
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if (sv == sv1 && *sv1 == pv1)
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pr_info(" got expected PTR%d -> PTR%d result\n",
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ptr_id(sv1), ptr_id(*sv1));
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ret = shadow_get(obj + 1, id);
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if (!ret)
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sv = shadow_get(obj + 1, id);
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if (!sv)
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return -EINVAL;
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if (ret == sv2 && *sv2 == &var2)
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if (sv == sv2 && *sv2 == pv2)
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pr_info(" got expected PTR%d -> PTR%d result\n",
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ptr_id(sv2), ptr_id(*sv2));
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ret = shadow_get(obj, id + 1);
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if (!ret)
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sv = shadow_get(obj, id + 1);
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if (!sv)
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return -EINVAL;
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if (ret == sv3 && *sv3 == &var3)
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if (sv == sv3 && *sv3 == pv3)
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pr_info(" got expected PTR%d -> PTR%d result\n",
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ptr_id(sv3), ptr_id(*sv3));
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@ -193,14 +212,14 @@ static int test_klp_shadow_vars_init(void)
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* Allocate or get a few more, this time with the same <obj>, <id>.
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* The second invocation should return the same shadow var.
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*/
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sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
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sv4 = shadow_get_or_alloc(obj + 2, id, sizeof(pv4), gfp_flags, shadow_ctor, &pv4);
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if (!sv4)
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return -ENOMEM;
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ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
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if (!ret)
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sv = shadow_get_or_alloc(obj + 2, id, sizeof(pv4), gfp_flags, shadow_ctor, &pv4);
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if (!sv)
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return -EINVAL;
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if (ret == sv4 && *sv4 == &var4)
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if (sv == sv4 && *sv4 == pv4)
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pr_info(" got expected PTR%d -> PTR%d result\n",
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ptr_id(sv4), ptr_id(*sv4));
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@ -209,27 +228,27 @@ static int test_klp_shadow_vars_init(void)
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* longer find them.
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*/
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shadow_free(obj, id, shadow_dtor); /* sv1 */
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ret = shadow_get(obj, id);
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if (!ret)
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sv = shadow_get(obj, id);
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if (!sv)
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pr_info(" got expected NULL result\n");
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shadow_free(obj + 1, id, shadow_dtor); /* sv2 */
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ret = shadow_get(obj + 1, id);
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if (!ret)
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sv = shadow_get(obj + 1, id);
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if (!sv)
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pr_info(" got expected NULL result\n");
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shadow_free(obj + 2, id, shadow_dtor); /* sv4 */
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ret = shadow_get(obj + 2, id);
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if (!ret)
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sv = shadow_get(obj + 2, id);
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if (!sv)
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pr_info(" got expected NULL result\n");
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/*
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* We should still find an <id+1> variable.
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*/
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ret = shadow_get(obj, id + 1);
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if (!ret)
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sv = shadow_get(obj, id + 1);
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if (!sv)
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return -EINVAL;
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if (ret == sv3 && *sv3 == &var3)
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if (sv == sv3 && *sv3 == pv3)
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pr_info(" got expected PTR%d -> PTR%d result\n",
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ptr_id(sv3), ptr_id(*sv3));
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@ -237,8 +256,8 @@ static int test_klp_shadow_vars_init(void)
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* Free all the <id+1> variables, too.
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*/
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shadow_free_all(id + 1, shadow_dtor); /* sv3 */
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ret = shadow_get(obj, id);
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if (!ret)
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sv = shadow_get(obj, id);
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if (!sv)
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pr_info(" shadow_get() got expected NULL result\n");
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@ -52,17 +52,21 @@ struct dummy {
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*/
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static int shadow_leak_ctor(void *obj, void *shadow_data, void *ctor_data)
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{
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void **shadow_leak = shadow_data;
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void *leak = ctor_data;
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int **shadow_leak = shadow_data;
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int **leak = ctor_data;
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*shadow_leak = leak;
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if (!ctor_data)
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return -EINVAL;
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*shadow_leak = *leak;
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return 0;
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}
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static struct dummy *livepatch_fix1_dummy_alloc(void)
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{
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struct dummy *d;
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void *leak;
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int *leak;
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int **shadow_leak;
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d = kzalloc(sizeof(*d), GFP_KERNEL);
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if (!d)
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@ -76,25 +80,34 @@ static struct dummy *livepatch_fix1_dummy_alloc(void)
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* variable. A patched dummy_free routine can later fetch this
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* pointer to handle resource release.
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*/
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leak = kzalloc(sizeof(int), GFP_KERNEL);
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if (!leak) {
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kfree(d);
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return NULL;
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}
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leak = kzalloc(sizeof(*leak), GFP_KERNEL);
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if (!leak)
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goto err_leak;
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klp_shadow_alloc(d, SV_LEAK, sizeof(leak), GFP_KERNEL,
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shadow_leak_ctor, leak);
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shadow_leak = klp_shadow_alloc(d, SV_LEAK, sizeof(leak), GFP_KERNEL,
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shadow_leak_ctor, &leak);
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if (!shadow_leak) {
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pr_err("%s: failed to allocate shadow variable for the leaking pointer: dummy @ %p, leak @ %p\n",
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__func__, d, leak);
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goto err_shadow;
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}
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pr_info("%s: dummy @ %p, expires @ %lx\n",
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__func__, d, d->jiffies_expire);
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return d;
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err_shadow:
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kfree(leak);
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err_leak:
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kfree(d);
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return NULL;
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}
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static void livepatch_fix1_dummy_leak_dtor(void *obj, void *shadow_data)
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{
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void *d = obj;
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void **shadow_leak = shadow_data;
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int **shadow_leak = shadow_data;
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kfree(*shadow_leak);
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pr_info("%s: dummy @ %p, prevented leak @ %p\n",
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@ -103,7 +116,7 @@ static void livepatch_fix1_dummy_leak_dtor(void *obj, void *shadow_data)
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static void livepatch_fix1_dummy_free(struct dummy *d)
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{
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void **shadow_leak;
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int **shadow_leak;
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/*
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* Patch: fetch the saved SV_LEAK shadow variable, detach and
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@ -59,7 +59,7 @@ static bool livepatch_fix2_dummy_check(struct dummy *d, unsigned long jiffies)
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static void livepatch_fix2_dummy_leak_dtor(void *obj, void *shadow_data)
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{
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void *d = obj;
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void **shadow_leak = shadow_data;
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int **shadow_leak = shadow_data;
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kfree(*shadow_leak);
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pr_info("%s: dummy @ %p, prevented leak @ %p\n",
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@ -68,7 +68,7 @@ static void livepatch_fix2_dummy_leak_dtor(void *obj, void *shadow_data)
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static void livepatch_fix2_dummy_free(struct dummy *d)
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{
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void **shadow_leak;
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int **shadow_leak;
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int *shadow_count;
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/* Patch: copy the memory leak patch from the fix1 module. */
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@ -95,7 +95,7 @@ struct dummy {
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static __used noinline struct dummy *dummy_alloc(void)
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{
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struct dummy *d;
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void *leak;
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int *leak;
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d = kzalloc(sizeof(*d), GFP_KERNEL);
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if (!d)
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@ -105,7 +105,7 @@ static __used noinline struct dummy *dummy_alloc(void)
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msecs_to_jiffies(1000 * EXPIRE_PERIOD);
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/* Oops, forgot to save leak! */
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leak = kzalloc(sizeof(int), GFP_KERNEL);
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leak = kzalloc(sizeof(*leak), GFP_KERNEL);
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if (!leak) {
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kfree(d);
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return NULL;
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