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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 06/23] livepatch: Enable the livepatch submodule
Date: Fri, 17 Jan 2020 16:03:06 +0100
Message-ID: <20200117150323.21801-7-pmladek@suse.com> (raw)
In-Reply-To: <20200117150323.21801-1-pmladek@suse.com>

The final step when loading livepatch module for livepatching a module
is to actually enable the livepatch.

The steps are exactly the same as in kmp_module_comming().

Note that there is no need to call klp_cleanup_module_patches_limited()
in the error path. klp_add_object() modifies only the single matching
struct klp_patch.

Signed-off-by: Petr Mladek <pmladek@suse.com>
---
 kernel/livepatch/core.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 6c27b635e5a7..c21bd9ec2012 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -1011,6 +1011,28 @@ int klp_add_object(struct klp_object *obj)
 		goto err_free;
 	}
 
+	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_free;
+	}
+
+	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_free;
+	}
+
+	if (patch != klp_transition_patch)
+		klp_post_patch_callback(obj);
+
 	mutex_unlock(&klp_mutex);
 	return 0;
 
-- 
2.16.4


  parent reply index

Thread overview: 32+ 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
2020-01-17 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 ` Petr Mladek [this message]
2020-01-17 15:03 ` [POC 07/23] livepatch: Remove obsolete functionality from klp_module_coming() Petr Mladek
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
2020-01-17 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
2020-01-17 15:03 ` [POC 23/23] module: Remove obsolete module_disable_ro() Petr Mladek

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