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modules: add ro_after_init support

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Add ro_after_init support for modules by adding a new page-aligned section
in the module layout (after rodata) for ro_after_init data and enabling RO
protection for that section after module init runs.

Signed-off-by: Jessica Yu <jeyu@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Jessica Yu 2016-07-27 12:06:21 +09:30 • committed by Rusty Russell
parent bdc9f37355
commit 444d13ff10
4 changed files with 60 additions and 15 deletions
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6
include/linux/module.h
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@ -298,6 +298,8 @@ struct module_layout {
unsigned int text_size;
/* Size of RO section of the module (text+rodata) */
unsigned int ro_size;
/* Size of RO after init section */
unsigned int ro_after_init_size;
#ifdef CONFIG_MODULES_TREE_LOOKUP
struct mod_tree_node mtn;
@ -765,12 +767,12 @@ extern int module_sysfs_initialized;
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
extern void set_all_modules_text_rw(void);
extern void set_all_modules_text_ro(void);
extern void module_enable_ro(const struct module *mod);
extern void module_enable_ro(const struct module *mod, bool after_init);
extern void module_disable_ro(const struct module *mod);
#else
static inline void set_all_modules_text_rw(void) { }
static inline void set_all_modules_text_ro(void) { }
static inline void module_enable_ro(const struct module *mod) { }
static inline void module_enable_ro(const struct module *mod, bool after_init) { }
static inline void module_disable_ro(const struct module *mod) { }
#endif