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module: split unset_section_ro_nx function.

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Split the unprotect function into a function per section to make
the code more readable and add the missing static declaration.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Jan Glauber 2011-05-19 16:55:26 -06:00 committed by Rusty Russell
parent 448694a1d5
commit 01526ed083
1 changed files with 22 additions and 21 deletions
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43
kernel/module.c
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@ -1607,24 +1607,24 @@ static void set_section_ro_nx(void *base,
}
}
/* Setting memory back to W+X before releasing it */
void unset_section_ro_nx(struct module *mod, void *module_region)
static void unset_module_core_ro_nx(struct module *mod)
{
if (mod->module_core == module_region) {
set_page_attributes(mod->module_core + mod->core_text_size,
mod->module_core + mod->core_size,
set_memory_x);
set_page_attributes(mod->module_core,
mod->module_core + mod->core_ro_size,
set_memory_rw);
} else if (mod->module_init == module_region) {
set_page_attributes(mod->module_init + mod->init_text_size,
mod->module_init + mod->init_size,
set_memory_x);
set_page_attributes(mod->module_init,
mod->module_init + mod->init_ro_size,
set_memory_rw);
}
set_page_attributes(mod->module_core + mod->core_text_size,
mod->module_core + mod->core_size,
set_memory_x);
set_page_attributes(mod->module_core,
mod->module_core + mod->core_ro_size,
set_memory_rw);
}
static void unset_module_init_ro_nx(struct module *mod)
{
set_page_attributes(mod->module_init + mod->init_text_size,
mod->module_init + mod->init_size,
set_memory_x);
set_page_attributes(mod->module_init,
mod->module_init + mod->init_ro_size,
set_memory_rw);
}
/* Iterate through all modules and set each module's text as RW */
@ -1670,7 +1670,8 @@ void set_all_modules_text_ro(void)
}
#else
static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
static inline void unset_section_ro_nx(struct module *mod, void *module_region) { }
static void unset_module_core_ro_nx(struct module *mod) { }
static void unset_module_init_ro_nx(struct module *mod) { }
#endif
/* Free a module, remove from lists, etc. */
@ -1697,7 +1698,7 @@ static void free_module(struct module *mod)
destroy_params(mod->kp, mod->num_kp);
/* This may be NULL, but that's OK */
unset_section_ro_nx(mod, mod->module_init);
unset_module_init_ro_nx(mod);
module_free(mod, mod->module_init);
kfree(mod->args);
percpu_modfree(mod);
@ -1706,7 +1707,7 @@ static void free_module(struct module *mod)
lockdep_free_key_range(mod->module_core, mod->core_size);
/* Finally, free the core (containing the module structure) */
unset_section_ro_nx(mod, mod->module_core);
unset_module_core_ro_nx(mod);
module_free(mod, mod->module_core);
#ifdef CONFIG_MPU
@ -2932,7 +2933,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
mod->symtab = mod->core_symtab;
mod->strtab = mod->core_strtab;
#endif
unset_section_ro_nx(mod, mod->module_init);
unset_module_init_ro_nx(mod);
module_free(mod, mod->module_init);
mod->module_init = NULL;
mod->init_size = 0;