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Signed-off-by: David Kaplan --- include/linux/module.h | 5 +++++ kernel/module/main.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/include/linux/module.h b/include/linux/module.h index e135cc79acee..2d8c34cb961f 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -1020,4 +1020,9 @@ static inline unsigned long find_kallsyms_symbol_valu= e(struct module *mod, /* Define __free(module_put) macro for struct module *. */ DEFINE_FREE(module_put, struct module *, if (_T) module_put(_T)) =20 +#ifdef CONFIG_DYNAMIC_MITIGATIONS +void modules_prepare_repatch(void); +void modules_post_repatch(void); +#endif + #endif /* _LINUX_MODULE_H */ diff --git a/kernel/module/main.c b/kernel/module/main.c index 088f9399af11..0525b1c6d5b9 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3910,3 +3910,37 @@ static int module_debugfs_init(void) } module_init(module_debugfs_init); #endif + +#ifdef CONFIG_DYNAMIC_MITIGATIONS +static void change_mod_mem_perm(struct module *mod, enum mod_mem_type type, + bool writeable) +{ + unsigned long base, size; + + base =3D (unsigned long) mod->mem[type].base; + size =3D mod->mem[type].size; + + if (writeable) + set_memory_rw(base, PFN_UP(size)); + else + set_memory_ro(base, PFN_UP(size)); +} + +void modules_prepare_repatch(void) +{ + struct module *mod; + + list_for_each_entry(mod, &modules, list) { + change_mod_mem_perm(mod, MOD_TEXT, true); + } +} + +void modules_post_repatch(void) +{ + struct module *mod; + + list_for_each_entry(mod, &modules, list) { + change_mod_mem_perm(mod, MOD_TEXT, false); + } +} +#endif --=20 2.34.1