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Merge branch 'for-4.15/callbacks' into for-linus

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This pulls in an infrastructure/API that allows livepatch writers to
register pre-patch and post-patch callbacks that allow for running a
glue code necessary for finalizing the patching if necessary.

Conflicts:
	kernel/livepatch/core.c
	- trivial conflict by adding a callback call into
	  module going notifier vs. moving that code block
	  to klp_cleanup_module_patches_limited()

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina
2017-11-15 10:53:24 +01:00
parent cb65dc7b89 89a9a1c1c8
commit fc41efc184
10 changed files with 1114 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/livepatch/core.c
+42 -10
View File
@@ -54,11 +54,6 @@ static bool klp_is_module(struct klp_object *obj)
return obj->name;
}
static bool klp_is_object_loaded(struct klp_object *obj)
{
return !obj->name || obj->mod;
}
/* sets obj->mod if object is not vmlinux and module is found */
static void klp_find_object_module(struct klp_object *obj)
{
@@ -285,6 +280,11 @@ static int klp_write_object_relocations(struct module *pmod,
static int __klp_disable_patch(struct klp_patch *patch)
{
struct klp_object *obj;
if (WARN_ON(!patch->enabled))
return -EINVAL;
if (klp_transition_patch)
return -EBUSY;
@@ -295,6 +295,10 @@ static int __klp_disable_patch(struct klp_patch *patch)
klp_init_transition(patch, KLP_UNPATCHED);
klp_for_each_object(patch, obj)
if (obj->patched)
klp_pre_unpatch_callback(obj);
/*
* Enforce the order of the func->transition writes in
* klp_init_transition() and the TIF_PATCH_PENDING writes in
@@ -388,13 +392,18 @@ static int __klp_enable_patch(struct klp_patch *patch)
if (!klp_is_object_loaded(obj))
continue;
ret = klp_pre_patch_callback(obj);
if (ret) {
pr_warn("pre-patch callback failed for object '%s'\n",
klp_is_module(obj) ? obj->name : "vmlinux");
goto err;
}
ret = klp_patch_object(obj);
if (ret) {
pr_warn("failed to enable patch '%s'\n",
patch->mod->name);
klp_cancel_transition();
return ret;
pr_warn("failed to patch object '%s'\n",
klp_is_module(obj) ? obj->name : "vmlinux");
goto err;
}
}
@@ -403,6 +412,11 @@ static int __klp_enable_patch(struct klp_patch *patch)
patch->enabled = true;
return 0;
err:
pr_warn("failed to enable patch '%s'\n", patch->mod->name);
klp_cancel_transition();
return ret;
}
/**
@@ -854,9 +868,15 @@ static void klp_cleanup_module_patches_limited(struct module *mod,
* is in transition.
*/
if (patch->enabled || patch == klp_transition_patch) {
if (patch != klp_transition_patch)
klp_pre_unpatch_callback(obj);
pr_notice("reverting patch '%s' on unloading module '%s'\n",
patch->mod->name, obj->mod->name);
klp_unpatch_object(obj);
klp_post_unpatch_callback(obj);
}
klp_free_object_loaded(obj);
@@ -906,13 +926,25 @@ int klp_module_coming(struct module *mod)
pr_notice("applying patch '%s' to loading module '%s'\n",
patch->mod->name, obj->mod->name);
ret = klp_pre_patch_callback(obj);
if (ret) {
pr_warn("pre-patch callback failed for object '%s'\n",
obj->name);
goto err;
}
ret = klp_patch_object(obj);
if (ret) {
pr_warn("failed to apply patch '%s' to module '%s' (%d)\n",
patch->mod->name, obj->mod->name, ret);
klp_post_unpatch_callback(obj);
goto err;
}
if (patch != klp_transition_patch)
klp_post_patch_callback(obj);
break;
}
}