On Thu, 21 Jul 2016, Jessica Yu wrote:
> Introduce arch_klp_init_object_loaded() to complete any additional
> arch-specific tasks during patching. Architecture code may override this
> function.
>
> Signed-off-by: Jessica Yu <jeyu@xxxxxxxxxx>
> ---
> include/linux/livepatch.h | 3 +++
> kernel/livepatch/core.c | 12 ++++++++++--
> 2 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
> index a93a0b2..9072f04 100644
> --- a/include/linux/livepatch.h
> +++ b/include/linux/livepatch.h
> @@ -116,6 +116,9 @@ int klp_unregister_patch(struct klp_patch *);
> int klp_enable_patch(struct klp_patch *);
> int klp_disable_patch(struct klp_patch *);
>
> +void arch_klp_init_object_loaded(struct klp_patch *patch,
> + struct klp_object *obj);
> +
> /* Called from the module loader during module coming/going states */
> int klp_module_coming(struct module *mod);
> void klp_module_going(struct module *mod);
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index 5c2bc10..164eff6 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -274,7 +274,6 @@ static int klp_write_object_relocations(struct module *pmod,
>
> objname = klp_is_module(obj) ? obj->name : "vmlinux";
>
> - module_disable_ro(pmod);
> /* For each klp relocation section */
> for (i = 1; i < pmod->klp_info->hdr.e_shnum; i++) {
> sec = pmod->klp_info->sechdrs + i;
> @@ -309,7 +308,6 @@ static int klp_write_object_relocations(struct module *pmod,
> break;
> }
>
> - module_enable_ro(pmod);
> return ret;
> }
>
> @@ -763,6 +761,12 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
> func->old_sympos ? func->old_sympos : 1);
> }
>
> +/* Arches may override this to finish any remaining arch-specific tasks */
> +void __weak arch_klp_init_object_loaded(struct klp_patch *patch,
> + struct klp_object *obj)
> +{
> +}
> +
> /* parts of the initialization that is done only when the object is loaded */
> static int klp_init_object_loaded(struct klp_patch *patch,
> struct klp_object *obj)
> @@ -770,10 +774,14 @@ static int klp_init_object_loaded(struct klp_patch *patch,
> struct klp_func *func;
> int ret;
>
> + module_disable_ro(patch->mod);
> ret = klp_write_object_relocations(patch->mod, obj);
> if (ret)
> return ret;
We need to call module_enable_ro(patch->mod) here before returning back.
Miroslav
>
> + arch_klp_init_object_loaded(patch, obj);
> + module_enable_ro(patch->mod);
> +
> klp_for_each_func(obj, func) {
> ret = klp_find_object_symbol(obj->name, func->old_name,
> func->old_sympos,
> --
> 2.5.5
>
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