RepoMirrors
/
kpatch
mirror of https://github.com/dynup/kpatch
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
kpatch/kmod/core/kpatch.h

64 lines
1.6 KiB
C
Raw Normal View History

add documentation to core kmod files Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 20:01:00 +00:00
/*
* kpatch.h
*
* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
kmod/core: remove unused old_func_name field Not needed, we can always add it again later if needed (for sanity checks, maybe)
2014-03-13 20:08:08 +00:00
* Copyright (C) 2013-2014 Josh Poimboeuf <jpoimboe@redhat.com>
add documentation to core kmod files Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 20:01:00 +00:00
*
add GPLv2 headers to source files
2014-03-05 03:34:03 +00:00
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
kmod/core: checkpatch and sparse fixes - checkpatch doesn't like the FSF address since it's subject to change - checkpatch doesn't like strings split by line - whitespace fix - sparse suggested to change some variables and functions to static
2014-05-01 17:19:41 +00:00
* along with this program; if not, see <https://www.gnu.org/licenses/>.
add GPLv2 headers to source files
2014-03-05 03:34:03 +00:00
*
use consistent naming for core and patch modules
2014-02-13 16:51:00 +00:00
* Contains the API for the core kpatch module used by the patch modules
add documentation to core kmod files Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 20:01:00 +00:00
*/
major rewrite to per-section function/data model Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 16:25:48 +00:00
#ifndef _KPATCH_H_
#define _KPATCH_H_
refactor core <-> patch interface Make kpatch_funs truly internal by: Defining it in core.c Adding a struct kpatch_internal, declared in kpatch.h and defined in core.c, that contains per patch module internal data. Adding an "internal" field to struct kpatch_modules. Allocating internal and funcs data in core.c, not in the patch module, since the patch module has no knowledge of kpatch_func anymore. Adding a "patch" field to kpatch_func that points directly to the kpatch_patch provided by the module (rather than a field-by-field copy) Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-05-12 19:36:10 +00:00
struct kpatch_patch {
kmod/core: rename some variables For the sake of consistency and readability, rename some variables. Also change func->old_addr_end to func->old_size.
2014-03-14 18:22:59 +00:00
unsigned long new_addr;
fix activeness safety check when unpatching When unpatching, the activeness safety logic should check for the new function on the stack, not the old one. Fixes #64.
2014-04-21 16:49:58 +00:00
unsigned long new_size;
kmod/core: rename some variables For the sake of consistency and readability, rename some variables. Also change func->old_addr_end to func->old_size.
2014-03-14 18:22:59 +00:00
unsigned long old_addr;
unsigned long old_size;
major rewrite to per-section function/data model Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 16:25:48 +00:00
};
dynrelas support, obsoleting link-vmlinux-syms This adds dynamic linking support for the patch modules. It is the first step toward supporting patching module code and relocatable kernels. Rela entries that reference non-included local and non-exported global symbols are converted to "dynrelas". These dynrelas are relocations that are done by the core module, not the kernel module linker. This allows the core module to apply offsets to the base addresses found in the base vmlinux or module. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:59:05 +00:00
struct kpatch_dynrela {
unsigned long dest;
unsigned long src;
unsigned long type;
};
refactor core <-> patch interface Make kpatch_funs truly internal by: Defining it in core.c Adding a struct kpatch_internal, declared in kpatch.h and defined in core.c, that contains per patch module internal data. Adding an "internal" field to struct kpatch_modules. Allocating internal and funcs data in core.c, not in the patch module, since the patch module has no knowledge of kpatch_func anymore. Adding a "patch" field to kpatch_func that points directly to the kpatch_patch provided by the module (rather than a field-by-field copy) Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-05-12 19:36:10 +00:00
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/module.h>
struct kpatch_internal;
kmod: add new kpatch_module struct Put funcs, num_funcs, and mod in their own struct called kpatch_module. This allows us to keep patch module specific variables in one place (and we'll have more of these variables soon).
2014-04-21 16:29:01 +00:00
struct kpatch_module {
struct module *mod;
refactor core <-> patch interface Make kpatch_funs truly internal by: Defining it in core.c Adding a struct kpatch_internal, declared in kpatch.h and defined in core.c, that contains per patch module internal data. Adding an "internal" field to struct kpatch_modules. Allocating internal and funcs data in core.c, not in the patch module, since the patch module has no knowledge of kpatch_func anymore. Adding a "patch" field to kpatch_func that points directly to the kpatch_patch provided by the module (rather than a field-by-field copy) Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-05-12 19:36:10 +00:00
struct kpatch_patch *patches;
dynrelas support, obsoleting link-vmlinux-syms This adds dynamic linking support for the patch modules. It is the first step toward supporting patching module code and relocatable kernels. Rela entries that reference non-included local and non-exported global symbols are converted to "dynrelas". These dynrelas are relocations that are done by the core module, not the kernel module linker. This allows the core module to apply offsets to the base addresses found in the base vmlinux or module. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:59:05 +00:00
struct kpatch_dynrela *dynrelas;
refactor core <-> patch interface Make kpatch_funs truly internal by: Defining it in core.c Adding a struct kpatch_internal, declared in kpatch.h and defined in core.c, that contains per patch module internal data. Adding an "internal" field to struct kpatch_modules. Allocating internal and funcs data in core.c, not in the patch module, since the patch module has no knowledge of kpatch_func anymore. Adding a "patch" field to kpatch_func that points directly to the kpatch_patch provided by the module (rather than a field-by-field copy) Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-05-12 19:36:10 +00:00
int patches_nr;
dynrelas support, obsoleting link-vmlinux-syms This adds dynamic linking support for the patch modules. It is the first step toward supporting patching module code and relocatable kernels. Rela entries that reference non-included local and non-exported global symbols are converted to "dynrelas". These dynrelas are relocations that are done by the core module, not the kernel module linker. This allows the core module to apply offsets to the base addresses found in the base vmlinux or module. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:59:05 +00:00
int dynrelas_nr;
safe kpatch unload Currently the patch module calls kpatch_unregister in the patch module exit path. If the activeness safety check fails in kpatch_unregister, it's too late for the patch module to stop exiting, so all it can do is panic. Prevent this scenario by requiring the user to disable the patch module via sysfs before allowing the module to be unloaded. The sysfs write will fail if the activeness safety check fails. An rmmod will fail if the patch is still enabled. Also add support for this new unloading model in "kpatch unload".
2014-04-26 04:05:26 +00:00
bool enabled;
refactor core <-> patch interface Make kpatch_funs truly internal by: Defining it in core.c Adding a struct kpatch_internal, declared in kpatch.h and defined in core.c, that contains per patch module internal data. Adding an "internal" field to struct kpatch_modules. Allocating internal and funcs data in core.c, not in the patch module, since the patch module has no knowledge of kpatch_func anymore. Adding a "patch" field to kpatch_func that points directly to the kpatch_patch provided by the module (rather than a field-by-field copy) Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-05-12 19:36:10 +00:00
struct kpatch_internal *internal; /* used internally by core module */
kmod: add new kpatch_module struct Put funcs, num_funcs, and mod in their own struct called kpatch_module. This allows us to keep patch module specific variables in one place (and we'll have more of these variables soon).
2014-04-21 16:29:01 +00:00
};
safe kpatch unload Currently the patch module calls kpatch_unregister in the patch module exit path. If the activeness safety check fails in kpatch_unregister, it's too late for the patch module to stop exiting, so all it can do is panic. Prevent this scenario by requiring the user to disable the patch module via sysfs before allowing the module to be unloaded. The sysfs write will fail if the activeness safety check fails. An rmmod will fail if the patch is still enabled. Also add support for this new unloading model in "kpatch unload".
2014-04-26 04:05:26 +00:00
extern struct kobject *kpatch_patches_kobj;
kpatch replace Allow the user to atomically replace all existing modules with a new "kpatch replace" command. This provides a safe way to do atomic upgrades for cumulative patch module updates.
2014-04-28 21:18:29 +00:00
extern int kpatch_register(struct kpatch_module *kpmod, bool replace);
kmod: add new kpatch_module struct Put funcs, num_funcs, and mod in their own struct called kpatch_module. This allows us to keep patch module specific variables in one place (and we'll have more of these variables soon).
2014-04-21 16:29:01 +00:00
extern int kpatch_unregister(struct kpatch_module *kpmod);
major rewrite to per-section function/data model Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 16:25:48 +00:00
refactor core <-> patch interface Make kpatch_funs truly internal by: Defining it in core.c Adding a struct kpatch_internal, declared in kpatch.h and defined in core.c, that contains per patch module internal data. Adding an "internal" field to struct kpatch_modules. Allocating internal and funcs data in core.c, not in the patch module, since the patch module has no knowledge of kpatch_func anymore. Adding a "patch" field to kpatch_func that points directly to the kpatch_patch provided by the module (rather than a field-by-field copy) Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-05-12 19:36:10 +00:00
#endif /* __KERNEL__ */
major rewrite to per-section function/data model Signed-off-by: Seth Jennings <sjenning@redhat.com>
2014-02-11 16:25:48 +00:00
#endif /* _KPATCH_H_ */