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From: Petr Mladek <pmladek@suse.com>
To: Jiri Kosina <jikos@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Miroslav Benes <mbenes@suse.cz>
Cc: Joe Lawrence <joe.lawrence@redhat.com>,
	Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
	Nicolai Stange <nstange@suse.de>,
	live-patching@vger.kernel.org, linux-kernel@vger.kernel.org,
	Petr Mladek <pmladek@suse.com>
Subject: [POC 07/23] livepatch: Remove obsolete functionality from klp_module_coming()
Date: Fri, 17 Jan 2020 16:03:07 +0100
Message-ID: <20200117150323.21801-8-pmladek@suse.com> (raw)
In-Reply-To: <20200117150323.21801-1-pmladek@suse.com>

klp_module_coming() could not operate on the livepatch structures.
Instead it has to load the livepatch module that will call
klp_add_object().

The functionality has been migrated to klp_add_object() in
the previous commits and the code can be finally removed.

The only exception is mod->klp_alive flag. It will still be needed
to decide who is responsible for loading/removing the eventual
livepatch modules.

It is done this way to make the changes manageable and easier
to review.

Signed-off-by: Petr Mladek <pmladek@suse.com>
---
 kernel/livepatch/core.c | 59 -------------------------------------------------
 1 file changed, 59 deletions(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index c21bd9ec2012..bb851f916182 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -1290,10 +1290,6 @@ static void klp_cleanup_module_patches_limited(struct module *mod,
 
 int klp_module_coming(struct module *mod)
 {
-	int ret;
-	struct klp_patch *patch;
-	struct klp_object *obj;
-
 	if (WARN_ON(mod->state != MODULE_STATE_COMING))
 		return -EINVAL;
 
@@ -1304,64 +1300,9 @@ int klp_module_coming(struct module *mod)
 	 * get patched by a new patch.
 	 */
 	mod->klp_alive = true;
-
-	klp_for_each_patch(patch) {
-		klp_for_each_object(patch, obj) {
-			if (!klp_is_module(obj) || strcmp(obj->name, mod->name))
-				continue;
-
-			obj->mod = mod;
-
-			ret = klp_init_object_loaded(obj);
-			if (ret) {
-				pr_warn("failed to initialize patch '%s' for module '%s' (%d)\n",
-					patch->obj->patch_name, obj->name, ret);
-				goto err;
-			}
-
-			pr_notice("applying patch '%s' to loading module '%s'\n",
-				  patch->obj->patch_name, obj->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->obj->patch_name, obj->name, ret);
-
-				klp_post_unpatch_callback(obj);
-				goto err;
-			}
-
-			if (patch != klp_transition_patch)
-				klp_post_patch_callback(obj);
-
-			break;
-		}
-	}
-
 	mutex_unlock(&klp_mutex);
 
 	return 0;
-
-err:
-	/*
-	 * If a patch is unsuccessfully applied, return
-	 * error to the module loader.
-	 */
-	pr_warn("patch '%s' failed for module '%s', refusing to load module '%s'\n",
-		patch->obj->patch_name, obj->name, obj->name);
-	mod->klp_alive = false;
-	obj->mod = NULL;
-	klp_cleanup_module_patches_limited(mod, patch);
-	mutex_unlock(&klp_mutex);
-
-	return ret;
 }
 
 void klp_module_going(struct module *mod)
-- 
2.16.4


  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-17 15:03 [POC 00/23] livepatch: Split livepatch module per-object Petr Mladek
2020-01-17 15:03 ` [POC 01/23] module: Allow to delete module also from inside kernel Petr Mladek
2020-01-21 11:11   ` Julien Thierry
2020-01-17 15:03 ` [POC 02/23] livepatch: Split livepatch modules per livepatched object Petr Mladek
2020-01-21 11:11   ` Julien Thierry
2020-01-28 12:16     ` Petr Mladek
2020-01-17 15:03 ` [POC 03/23] livepatch: Better checks of struct klp_object definition Petr Mladek
2020-01-21 11:27   ` Julien Thierry
2020-01-17 15:03 ` [POC 04/23] livepatch: Prevent loading livepatch sub-module unintentionally Petr Mladek
2020-04-03 17:54   ` Joe Lawrence
2020-01-17 15:03 ` [POC 05/23] livepatch: Initialize and free livepatch submodule Petr Mladek
2020-01-21 11:58   ` Julien Thierry
2020-01-17 15:03 ` [POC 06/23] livepatch: Enable the " Petr Mladek
2020-01-17 15:03 ` Petr Mladek [this message]
2020-01-17 15:03 ` [POC 08/23] livepatch: Automatically load livepatch module when the patch module is loaded Petr Mladek
2020-01-17 15:03 ` [POC 09/23] livepatch: Handle race when livepatches are reloaded during a module load Petr Mladek
2020-01-22 18:51   ` Julien Thierry
2020-01-17 15:03 ` [POC 10/23] livepatch: Handle modprobe exit code Petr Mladek
2020-01-17 15:03 ` [POC 11/23] livepatch: Safely detect forced transition when removing split livepatch modules Petr Mladek
2020-01-22 10:15   ` Julien Thierry
2020-01-17 15:03 ` [POC 12/23] livepatch: Automatically remove livepatch module when the object is freed Petr Mladek
2020-01-17 15:03 ` [POC 13/23] livepatch: Remove livepatch module when the livepatched module is unloaded Petr Mladek
2020-01-17 15:03 ` [POC 14/23] livepatch: Never block livepatch modules when the related module is being removed Petr Mladek
2020-01-17 15:03 ` [POC 15/23] livepatch: Prevent infinite loop when loading livepatch module Petr Mladek
2020-01-17 15:03 ` [POC 16/23] livepatch: Add patch into the global list early Petr Mladek
2020-01-17 15:03 ` [POC 17/23] livepatch: Load livepatches for modules when loading the main livepatch Petr Mladek
2020-01-17 15:03 ` [POC 18/23] module: Refactor add_unformed_module() Petr Mladek
2020-01-17 15:03 ` [POC 19/23] module/livepatch: Allow to use exported symbols from livepatch module for "vmlinux" Petr Mladek
2020-01-17 15:03 ` [POC 20/23] module/livepatch: Relocate local variables in the module loaded when the livepatch is being loaded Petr Mladek
2020-01-18 10:29   ` kbuild test robot
2020-04-03 18:00   ` Joe Lawrence
2020-01-17 15:03 ` [POC 21/23] livepatch: Remove obsolete arch_klp_init_object_loaded() Petr Mladek
2020-01-17 15:03 ` [POC 22/23] livepatch/module: Remove obsolete copy_module_elf() Petr Mladek
2020-04-03 18:03   ` Joe Lawrence
2020-01-17 15:03 ` [POC 23/23] module: Remove obsolete module_disable_ro() Petr Mladek

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