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module: group post-relocation functions into post_relocation()

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This simply hoists more code out of load_module; we also put the
identification of the extable and dynamic debug table in with the
others in find_module_sections().

We move the taint check to the actual add/remove of the dynamic debug
info: this is certain (find_module_sections is too early).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Yehuda Sadeh <yehuda@hq.newdream.net>
This commit is contained in:
Rusty Russell 2010-08-05 12:59:12 -06:00
parent 6526c534b2
commit 811d66a0e1
1 changed files with 32 additions and 24 deletions
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56
kernel/module.c
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@ -117,6 +117,8 @@ struct load_info {
char *secstrings, *strtab;
unsigned long *strmap;
unsigned long symoffs, stroffs;
struct _ddebug *debug;
unsigned int num_debug;
struct {
unsigned int sym, str, mod, vers, info, pcpu;
} index;
@ -1993,7 +1995,7 @@ static void layout_symtab(struct module *mod, struct load_info *info)
mod->core_size += bitmap_weight(info->strmap, strsect->sh_size);
}
static void add_kallsyms(struct module *mod, struct load_info *info)
static void add_kallsyms(struct module *mod, const struct load_info *info)
{
unsigned int i, ndst;
const Elf_Sym *src;
@ -2040,6 +2042,8 @@ static void add_kallsyms(struct module *mod, struct load_info *info)
static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
{
if (!debug)
return;
#ifdef CONFIG_DYNAMIC_DEBUG
if (ddebug_add_module(debug, num, debug->modname))
printk(KERN_ERR "dynamic debug error adding module: %s\n",
@ -2267,8 +2271,7 @@ static int check_modinfo(struct module *mod, struct load_info *info)
return 0;
}
static void find_module_sections(struct module *mod,
const struct load_info *info)
static void find_module_sections(struct module *mod, struct load_info *info)
{
mod->kp = section_objs(info, "__param",
sizeof(*mod->kp), &mod->num_kp);
@ -2323,9 +2326,15 @@ static void find_module_sections(struct module *mod,
&mod->num_ftrace_callsites);
#endif
mod->extable = section_objs(info, "__ex_table",
sizeof(*mod->extable), &mod->num_exentries);
if (section_addr(info, "__obsparm"))
printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
mod->name);
info->debug = section_objs(info, "__verbose",
sizeof(*info->debug), &info->num_debug);
}
static int move_module(struct module *mod, struct load_info *info)
@ -2512,6 +2521,20 @@ static void module_deallocate(struct module *mod, struct load_info *info)
module_free(mod, mod->module_core);
}
static int post_relocation(struct module *mod, const struct load_info *info)
{
sort_extable(mod->extable, mod->extable + mod->num_exentries);
/* Copy relocated percpu area over. */
percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
info->sechdrs[info->index.pcpu].sh_size);
add_kallsyms(mod, info);
/* Arch-specific module finalizing. */
return module_finalize(info->hdr, info->sechdrs, mod);
}
/* Allocate and load the module: note that size of section 0 is always
zero, and we rely on this for optional sections. */
static noinline struct module *load_module(void __user *umod,
@ -2521,8 +2544,6 @@ static noinline struct module *load_module(void __user *umod,
struct load_info info = { NULL, };
struct module *mod;
long err;
struct _ddebug *debug = NULL;
unsigned int num_debug = 0;
DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
umod, len, uargs);
@ -2564,22 +2585,7 @@ static noinline struct module *load_module(void __user *umod,
if (err < 0)
goto free_modinfo;
/* Set up and sort exception table */
mod->extable = section_objs(&info, "__ex_table",
sizeof(*mod->extable), &mod->num_exentries);
sort_extable(mod->extable, mod->extable + mod->num_exentries);
/* Finally, copy percpu area over. */
percpu_modcopy(mod, (void *)info.sechdrs[info.index.pcpu].sh_addr,
info.sechdrs[info.index.pcpu].sh_size);
add_kallsyms(mod, &info);
if (!mod->taints)
debug = section_objs(&info, "__verbose",
sizeof(*debug), &num_debug);
err = module_finalize(info.hdr, info.sechdrs, mod);
err = post_relocation(mod, &info);
if (err < 0)
goto free_modinfo;
@ -2607,8 +2613,9 @@ static noinline struct module *load_module(void __user *umod,
goto unlock;
}
if (debug)
dynamic_debug_setup(debug, num_debug);
/* This has to be done once we're sure module name is unique. */
if (!mod->taints)
dynamic_debug_setup(info.debug, info.num_debug);
/* Find duplicate symbols */
err = verify_export_symbols(mod);
@ -2640,7 +2647,8 @@ static noinline struct module *load_module(void __user *umod,
/* Unlink carefully: kallsyms could be walking list. */
list_del_rcu(&mod->list);
ddebug:
dynamic_debug_remove(debug);
if (!mod->taints)
dynamic_debug_remove(info.debug);
unlock:
mutex_unlock(&module_mutex);
synchronize_sched();