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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 13:49:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 13:49:55 -0700
commit90d3417a3a4e810d67081dd106f0e603a856978f (patch)
treeb9791c255f6d98114dcb5a0abf9228db4091a1ed /kernel
parent552c7dbb3459c219e44a65fd6bca21b1227c0e33 (diff)
parent51f3d0f474aaebbc253100fa32a49c8256812330 (diff)
downloadvexpress-lsk-90d3417a3a4e810d67081dd106f0e603a856978f.tar.gz
Merge branch 'modules' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
* 'modules' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: module: cleanup comments, remove noinline module: group post-relocation functions into post_relocation() module: move module args strndup_user to just before use module: pass load_info into other functions module: fix sysfs cleanup for !CONFIG_SYSFS module: sysfs cleanup module: layout_and_allocate module: fix crash in get_ksymbol() when oopsing in module init module: kallsyms functions take struct load_info module: refactor out section header rewriting: FIX modversions module: refactor out section header rewriting module: add load_info module: reduce stack usage for each_symbol() module: refactor load_module part 5 module: refactor load_module part 4 module: refactor load_module part 3 module: refactor load_module part 2 module: refactor load_module module: module_unload_init() cleanup
Diffstat (limited to 'kernel')
-rw-r--r--kernel/module.c1088
1 files changed, 581 insertions, 507 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 6c562828c85..d0b5f8db11b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1,6 +1,6 @@
/*
Copyright (C) 2002 Richard Henderson
- Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
+ Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -110,6 +110,20 @@ int unregister_module_notifier(struct notifier_block * nb)
}
EXPORT_SYMBOL(unregister_module_notifier);
+struct load_info {
+ Elf_Ehdr *hdr;
+ unsigned long len;
+ Elf_Shdr *sechdrs;
+ 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;
+};
+
/* We require a truly strong try_module_get(): 0 means failure due to
ongoing or failed initialization etc. */
static inline int strong_try_module_get(struct module *mod)
@@ -140,42 +154,38 @@ void __module_put_and_exit(struct module *mod, long code)
EXPORT_SYMBOL(__module_put_and_exit);
/* Find a module section: 0 means not found. */
-static unsigned int find_sec(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- const char *secstrings,
- const char *name)
+static unsigned int find_sec(const struct load_info *info, const char *name)
{
unsigned int i;
- for (i = 1; i < hdr->e_shnum; i++)
+ for (i = 1; i < info->hdr->e_shnum; i++) {
+ Elf_Shdr *shdr = &info->sechdrs[i];
/* Alloc bit cleared means "ignore it." */
- if ((sechdrs[i].sh_flags & SHF_ALLOC)
- && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
+ if ((shdr->sh_flags & SHF_ALLOC)
+ && strcmp(info->secstrings + shdr->sh_name, name) == 0)
return i;
+ }
return 0;
}
/* Find a module section, or NULL. */
-static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
- const char *secstrings, const char *name)
+static void *section_addr(const struct load_info *info, const char *name)
{
/* Section 0 has sh_addr 0. */
- return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
+ return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
}
/* Find a module section, or NULL. Fill in number of "objects" in section. */
-static void *section_objs(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- const char *secstrings,
+static void *section_objs(const struct load_info *info,
const char *name,
size_t object_size,
unsigned int *num)
{
- unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
+ unsigned int sec = find_sec(info, name);
/* Section 0 has sh_addr 0 and sh_size 0. */
- *num = sechdrs[sec].sh_size / object_size;
- return (void *)sechdrs[sec].sh_addr;
+ *num = info->sechdrs[sec].sh_size / object_size;
+ return (void *)info->sechdrs[sec].sh_addr;
}
/* Provided by the linker */
@@ -227,7 +237,7 @@ bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
unsigned int symnum, void *data), void *data)
{
struct module *mod;
- const struct symsearch arr[] = {
+ static const struct symsearch arr[] = {
{ __start___ksymtab, __stop___ksymtab, __start___kcrctab,
NOT_GPL_ONLY, false },
{ __start___ksymtab_gpl, __stop___ksymtab_gpl,
@@ -392,7 +402,8 @@ static int percpu_modalloc(struct module *mod,
mod->percpu = __alloc_reserved_percpu(size, align);
if (!mod->percpu) {
printk(KERN_WARNING
- "Could not allocate %lu bytes percpu data\n", size);
+ "%s: Could not allocate %lu bytes percpu data\n",
+ mod->name, size);
return -ENOMEM;
}
mod->percpu_size = size;
@@ -404,11 +415,9 @@ static void percpu_modfree(struct module *mod)
free_percpu(mod->percpu);
}
-static unsigned int find_pcpusec(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- const char *secstrings)
+static unsigned int find_pcpusec(struct load_info *info)
{
- return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
+ return find_sec(info, ".data..percpu");
}
static void percpu_modcopy(struct module *mod,
@@ -468,9 +477,7 @@ static inline int percpu_modalloc(struct module *mod,
static inline void percpu_modfree(struct module *mod)
{
}
-static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- const char *secstrings)
+static unsigned int find_pcpusec(struct load_info *info)
{
return 0;
}
@@ -524,21 +531,21 @@ static char last_unloaded_module[MODULE_NAME_LEN+1];
EXPORT_TRACEPOINT_SYMBOL(module_get);
/* Init the unload section of the module. */
-static void module_unload_init(struct module *mod)
+static int module_unload_init(struct module *mod)
{
- int cpu;
+ mod->refptr = alloc_percpu(struct module_ref);
+ if (!mod->refptr)
+ return -ENOMEM;
INIT_LIST_HEAD(&mod->source_list);
INIT_LIST_HEAD(&mod->target_list);
- for_each_possible_cpu(cpu) {
- per_cpu_ptr(mod->refptr, cpu)->incs = 0;
- per_cpu_ptr(mod->refptr, cpu)->decs = 0;
- }
/* Hold reference count during initialization. */
__this_cpu_write(mod->refptr->incs, 1);
/* Backwards compatibility macros put refcount during init. */
mod->waiter = current;
+
+ return 0;
}
/* Does a already use b? */
@@ -618,6 +625,8 @@ static void module_unload_free(struct module *mod)
kfree(use);
}
mutex_unlock(&module_mutex);
+
+ free_percpu(mod->refptr);
}
#ifdef CONFIG_MODULE_FORCE_UNLOAD
@@ -891,8 +900,9 @@ int ref_module(struct module *a, struct module *b)
}
EXPORT_SYMBOL_GPL(ref_module);
-static inline void module_unload_init(struct module *mod)
+static inline int module_unload_init(struct module *mod)
{
+ return 0;
}
#endif /* CONFIG_MODULE_UNLOAD */
@@ -1051,10 +1061,9 @@ static inline int same_magic(const char *amagic, const char *bmagic,
#endif /* CONFIG_MODVERSIONS */
/* Resolve a symbol for this module. I.e. if we find one, record usage. */
-static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
- unsigned int versindex,
+static const struct kernel_symbol *resolve_symbol(struct module *mod,
+ const struct load_info *info,
const char *name,
- struct module *mod,
char ownername[])
{
struct module *owner;
@@ -1068,7 +1077,8 @@ static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
if (!sym)
goto unlock;
- if (!check_version(sechdrs, versindex, name, mod, crc, owner)) {
+ if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
+ owner)) {
sym = ERR_PTR(-EINVAL);
goto getname;
}
@@ -1087,21 +1097,20 @@ unlock:
return sym;
}
-static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
- unsigned int versindex,
- const char *name,
- struct module *mod)
+static const struct kernel_symbol *
+resolve_symbol_wait(struct module *mod,
+ const struct load_info *info,
+ const char *name)
{
const struct kernel_symbol *ksym;
- char ownername[MODULE_NAME_LEN];
+ char owner[MODULE_NAME_LEN];
if (wait_event_interruptible_timeout(module_wq,
- !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name,
- mod, ownername)) ||
- PTR_ERR(ksym) != -EBUSY,
+ !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
+ || PTR_ERR(ksym) != -EBUSY,
30 * HZ) <= 0) {
printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
- mod->name, ownername);
+ mod->name, owner);
}
return ksym;
}
@@ -1110,8 +1119,9 @@ static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
* /sys/module/foo/sections stuff
* J. Corbet <corbet@lwn.net>
*/
-#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
+#ifdef CONFIG_SYSFS
+#ifdef CONFIG_KALLSYMS
static inline bool sect_empty(const Elf_Shdr *sect)
{
return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
@@ -1148,8 +1158,7 @@ static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
kfree(sect_attrs);
}
-static void add_sect_attrs(struct module *mod, unsigned int nsect,
- char *secstrings, Elf_Shdr *sechdrs)
+static void add_sect_attrs(struct module *mod, const struct load_info *info)
{
unsigned int nloaded = 0, i, size[2];
struct module_sect_attrs *sect_attrs;
@@ -1157,8 +1166,8 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
struct attribute **gattr;
/* Count loaded sections and allocate structures */
- for (i = 0; i < nsect; i++)
- if (!sect_empty(&sechdrs[i]))
+ for (i = 0; i < info->hdr->e_shnum; i++)
+ if (!sect_empty(&info->sechdrs[i]))
nloaded++;
size[0] = ALIGN(sizeof(*sect_attrs)
+ nloaded * sizeof(sect_attrs->attrs[0]),
@@ -1175,11 +1184,12 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
sect_attrs->nsections = 0;
sattr = &sect_attrs->attrs[0];
gattr = &sect_attrs->grp.attrs[0];
- for (i = 0; i < nsect; i++) {
- if (sect_empty(&sechdrs[i]))
+ for (i = 0; i < info->hdr->e_shnum; i++) {
+ Elf_Shdr *sec = &info->sechdrs[i];
+ if (sect_empty(sec))
continue;
- sattr->address = sechdrs[i].sh_addr;
- sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
+ sattr->address = sec->sh_addr;
+ sattr->name = kstrdup(info->secstrings + sec->sh_name,
GFP_KERNEL);
if (sattr->name == NULL)
goto out;
@@ -1247,8 +1257,7 @@ static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
kfree(notes_attrs);
}
-static void add_notes_attrs(struct module *mod, unsigned int nsect,
- char *secstrings, Elf_Shdr *sechdrs)
+static void add_notes_attrs(struct module *mod, const struct load_info *info)
{
unsigned int notes, loaded, i;
struct module_notes_attrs *notes_attrs;
@@ -1260,9 +1269,9 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
/* Count notes sections and allocate structures. */
notes = 0;
- for (i = 0; i < nsect; i++)
- if (!sect_empty(&sechdrs[i]) &&
- (sechdrs[i].sh_type == SHT_NOTE))
+ for (i = 0; i < info->hdr->e_shnum; i++)
+ if (!sect_empty(&info->sechdrs[i]) &&
+ (info->sechdrs[i].sh_type == SHT_NOTE))
++notes;
if (notes == 0)
@@ -1276,15 +1285,15 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
notes_attrs->notes = notes;
nattr = &notes_attrs->attrs[0];
- for (loaded = i = 0; i < nsect; ++i) {
- if (sect_empty(&sechdrs[i]))
+ for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
+ if (sect_empty(&info->sechdrs[i]))
continue;
- if (sechdrs[i].sh_type == SHT_NOTE) {
+ if (info->sechdrs[i].sh_type == SHT_NOTE) {
sysfs_bin_attr_init(nattr);
nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
nattr->attr.mode = S_IRUGO;
- nattr->size = sechdrs[i].sh_size;
- nattr->private = (void *) sechdrs[i].sh_addr;
+ nattr->size = info->sechdrs[i].sh_size;
+ nattr->private = (void *) info->sechdrs[i].sh_addr;
nattr->read = module_notes_read;
++nattr;
}
@@ -1315,8 +1324,8 @@ static void remove_notes_attrs(struct module *mod)
#else
-static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
- char *sectstrings, Elf_Shdr *sechdrs)
+static inline void add_sect_attrs(struct module *mod,
+ const struct load_info *info)
{
}
@@ -1324,17 +1333,16 @@ static inline void remove_sect_attrs(struct module *mod)
{
}
-static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
- char *sectstrings, Elf_Shdr *sechdrs)
+static inline void add_notes_attrs(struct module *mod,
+ const struct load_info *info)
{
}
static inline void remove_notes_attrs(struct module *mod)
{
}
-#endif
+#endif /* CONFIG_KALLSYMS */
-#ifdef CONFIG_SYSFS
static void add_usage_links(struct module *mod)
{
#ifdef CONFIG_MODULE_UNLOAD
@@ -1439,6 +1447,7 @@ out:
}
static int mod_sysfs_setup(struct module *mod,
+ const struct load_info *info,
struct kernel_param *kparam,
unsigned int num_params)
{
@@ -1463,6 +1472,8 @@ static int mod_sysfs_setup(struct module *mod,
goto out_unreg_param;
add_usage_links(mod);
+ add_sect_attrs(mod, info);
+ add_notes_attrs(mod, info);
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
return 0;
@@ -1479,33 +1490,26 @@ out:
static void mod_sysfs_fini(struct module *mod)
{
+ remove_notes_attrs(mod);
+ remove_sect_attrs(mod);
kobject_put(&mod->mkobj.kobj);
}
-#else /* CONFIG_SYSFS */
-
-static inline int mod_sysfs_init(struct module *mod)
-{
- return 0;
-}
+#else /* !CONFIG_SYSFS */
-static inline int mod_sysfs_setup(struct module *mod,
+static int mod_sysfs_setup(struct module *mod,
+ const struct load_info *info,
struct kernel_param *kparam,
unsigned int num_params)
{
return 0;
}
-static inline int module_add_modinfo_attrs(struct module *mod)
-{
- return 0;
-}
-
-static inline void module_remove_modinfo_attrs(struct module *mod)
+static void mod_sysfs_fini(struct module *mod)
{
}
-static void mod_sysfs_fini(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod)
{
}
@@ -1515,7 +1519,7 @@ static void del_usage_links(struct module *mod)
#endif /* CONFIG_SYSFS */
-static void mod_kobject_remove(struct module *mod)
+static void mod_sysfs_teardown(struct module *mod)
{
del_usage_links(mod);
module_remove_modinfo_attrs(mod);
@@ -1545,9 +1549,7 @@ static void free_module(struct module *mod)
mutex_lock(&module_mutex);
stop_machine(__unlink_module, mod, NULL);
mutex_unlock(&module_mutex);
- remove_notes_attrs(mod);
- remove_sect_attrs(mod);
- mod_kobject_remove(mod);
+ mod_sysfs_teardown(mod);
/* Remove dynamic debug info */
ddebug_remove_module(mod->name);
@@ -1565,10 +1567,7 @@ static void free_module(struct module *mod)
module_free(mod, mod->module_init);
kfree(mod->args);
percpu_modfree(mod);
-#if defined(CONFIG_MODULE_UNLOAD)
- if (mod->refptr)
- free_percpu(mod->refptr);
-#endif
+
/* Free lock-classes: */
lockdep_free_key_range(mod->module_core, mod->core_size);
@@ -1634,25 +1633,23 @@ static int verify_export_symbols(struct module *mod)
}
/* Change all symbols so that st_value encodes the pointer directly. */
-static int simplify_symbols(Elf_Shdr *sechdrs,
- unsigned int symindex,
- const char *strtab,
- unsigned int versindex,
- unsigned int pcpuindex,
- struct module *mod)
-{
- Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
+static int simplify_symbols(struct module *mod, const struct load_info *info)
+{
+ Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
+ Elf_Sym *sym = (void *)symsec->sh_addr;
unsigned long secbase;
- unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
+ unsigned int i;
int ret = 0;
const struct kernel_symbol *ksym;
- for (i = 1; i < n; i++) {
+ for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
+ const char *name = info->strtab + sym[i].st_name;
+
switch (sym[i].st_shndx) {
case SHN_COMMON:
/* We compiled with -fno-common. These are not
supposed to happen. */
- DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
+ DEBUGP("Common symbol: %s\n", name);
printk("%s: please compile with -fno-common\n",
mod->name);
ret = -ENOEXEC;
@@ -1665,9 +1662,7 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
break;
case SHN_UNDEF:
- ksym = resolve_symbol_wait(sechdrs, versindex,
- strtab + sym[i].st_name,
- mod);
+ ksym = resolve_symbol_wait(mod, info, name);
/* Ok if resolved. */
if (ksym && !IS_ERR(ksym)) {
sym[i].st_value = ksym->value;
@@ -1679,17 +1674,16 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
break;
printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
- mod->name, strtab + sym[i].st_name,
- PTR_ERR(ksym));
+ mod->name, name, PTR_ERR(ksym));
ret = PTR_ERR(ksym) ?: -ENOENT;
break;
default:
/* Divert to percpu allocation if a percpu var. */
- if (sym[i].st_shndx == pcpuindex)
+ if (sym[i].st_shndx == info->index.pcpu)
secbase = (unsigned long)mod_percpu(mod);
else
- secbase = sechdrs[sym[i].st_shndx].sh_addr;
+ secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
sym[i].st_value += secbase;
break;
}
@@ -1698,6 +1692,35 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
return ret;
}
+static int apply_relocations(struct module *mod, const struct load_info *info)
+{
+ unsigned int i;
+ int err = 0;
+
+ /* Now do relocations. */
+ for (i = 1; i < info->hdr->e_shnum; i++) {
+ unsigned int infosec = info->sechdrs[i].sh_info;
+
+ /* Not a valid relocation section? */
+ if (infosec >= info->hdr->e_shnum)
+ continue;
+
+ /* Don't bother with non-allocated sections */
+ if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
+ continue;
+
+ if (info->sechdrs[i].sh_type == SHT_REL)
+ err = apply_relocate(info->sechdrs, info->strtab,
+ info->index.sym, i, mod);
+ else if (info->sechdrs[i].sh_type == SHT_RELA)
+ err = apply_relocate_add(info->sechdrs, info->strtab,
+ info->index.sym, i, mod);
+ if (err < 0)
+ break;
+ }
+ return err;
+}
+
/* Additional bytes needed by arch in front of individual sections */
unsigned int __weak arch_mod_section_prepend(struct module *mod,
unsigned int section)
@@ -1722,10 +1745,7 @@ static long get_offset(struct module *mod, unsigned int *size,
might -- code, read-only data, read-write data, small data. Tally
sizes, and place the offsets into sh_entsize fields: high bit means it
belongs in init. */
-static void layout_sections(struct module *mod,
- const Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- const char *secstrings)
+static void layout_sections(struct module *mod, struct load_info *info)
{
static unsigned long const masks[][2] = {
/* NOTE: all executable code must be the first section
@@ -1738,21 +1758,22 @@ static void layout_sections(struct module *mod,
};
unsigned int m, i;
- for (i = 0; i < hdr->e_shnum; i++)
- sechdrs[i].sh_entsize = ~0UL;
+ for (i = 0; i < info->hdr->e_shnum; i++)
+ info->sechdrs[i].sh_entsize = ~0UL;
DEBUGP("Core section allocation order:\n");
for (m = 0; m < ARRAY_SIZE(masks); ++m) {
- for (i = 0; i < hdr->e_shnum; ++i) {
- Elf_Shdr *s = &sechdrs[i];
+ for (i = 0; i < info->hdr->e_shnum; ++i) {
+ Elf_Shdr *s = &info->sechdrs[i];
+ const char *sname = info->secstrings + s->sh_name;
if ((s->sh_flags & masks[m][0]) != masks[m][0]
|| (s->sh_flags & masks[m][1])
|| s->sh_entsize != ~0UL
- || strstarts(secstrings + s->sh_name, ".init"))
+ || strstarts(sname, ".init"))
continue;
s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
- DEBUGP("\t%s\n", secstrings + s->sh_name);
+ DEBUGP("\t%s\n", name);
}
if (m == 0)
mod->core_text_size = mod->core_size;
@@ -1760,17 +1781,18 @@ static void layout_sections(struct module *mod,
DEBUGP("Init section allocation order:\n");
for (m = 0; m < ARRAY_SIZE(masks); ++m) {
- for (i = 0; i < hdr->e_shnum; ++i) {
- Elf_Shdr *s = &sechdrs[i];
+ for (i = 0; i < info->hdr->e_shnum; ++i) {
+ Elf_Shdr *s = &info->sechdrs[i];
+ const char *sname = info->secstrings + s->sh_name;
if ((s->sh_flags & masks[m][0]) != masks[m][0]
|| (s->sh_flags & masks[m][1])
|| s->sh_entsize != ~0UL
- || !strstarts(secstrings + s->sh_name, ".init"))
+ || !strstarts(sname, ".init"))
continue;
s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
| INIT_OFFSET_MASK);
- DEBUGP("\t%s\n", secstrings + s->sh_name);
+ DEBUGP("\t%s\n", sname);
}
if (m == 0)
mod->init_text_size = mod->init_size;
@@ -1809,33 +1831,28 @@ static char *next_string(char *string, unsigned long *secsize)
return string;
}
-static char *get_modinfo(Elf_Shdr *sechdrs,
- unsigned int info,
- const char *tag)
+static char *get_modinfo(struct load_info *info, const char *tag)
{
char *p;
unsigned int taglen = strlen(tag);
- unsigned long size = sechdrs[info].sh_size;
+ Elf_Shdr *infosec = &info->sechdrs[info->index.info];
+ unsigned long size = infosec->sh_size;
- for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
+ for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
return p + taglen + 1;
}
return NULL;
}
-static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
- unsigned int infoindex)
+static void setup_modinfo(struct module *mod, struct load_info *info)
{
struct module_attribute *attr;
int i;
for (i = 0; (attr = modinfo_attrs[i]); i++) {
if (attr->setup)
- attr->setup(mod,
- get_modinfo(sechdrs,
- infoindex,
- attr->attr.name));
+ attr->setup(mod, get_modinfo(info, attr->attr.name));
}
}
@@ -1876,11 +1893,10 @@ static int is_exported(const char *name, unsigned long value,
}
/* As per nm */
-static char elf_type(const Elf_Sym *sym,
- Elf_Shdr *sechdrs,
- const char *secstrings,
- struct module *mod)
+static char elf_type(const Elf_Sym *sym, const struct load_info *info)
{
+ const Elf_Shdr *sechdrs = info->sechdrs;
+
if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
return 'v';
@@ -1910,8 +1926,10 @@ static char elf_type(const Elf_Sym *sym,
else
return 'b';
}
- if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
+ if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
+ ".debug")) {
return 'n';
+ }
return '?';
}
@@ -1936,127 +1954,96 @@ static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
return true;
}
-static unsigned long layout_symtab(struct module *mod,
- Elf_Shdr *sechdrs,
- unsigned int symindex,
- unsigned int strindex,
- const Elf_Ehdr *hdr,
- const char *secstrings,
- unsigned long *pstroffs,
- unsigned long *strmap)
+static void layout_symtab(struct module *mod, struct load_info *info)
{
- unsigned long symoffs;
- Elf_Shdr *symsect = sechdrs + symindex;
- Elf_Shdr *strsect = sechdrs + strindex;
+ Elf_Shdr *symsect = info->sechdrs + info->index.sym;
+ Elf_Shdr *strsect = info->sechdrs + info->index.str;
const Elf_Sym *src;
- const char *strtab;
unsigned int i, nsrc, ndst;
/* Put symbol section at end of init part of module. */
symsect->sh_flags |= SHF_ALLOC;
symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
- symindex) | INIT_OFFSET_MASK;
- DEBUGP("\t%s\n", secstrings + symsect->sh_name);
+ info->index.sym) | INIT_OFFSET_MASK;
+ DEBUGP("\t%s\n", info->secstrings + symsect->sh_name);
- src = (void *)hdr + symsect->sh_offset;
+ src = (void *)info->hdr + symsect->sh_offset;
nsrc = symsect->sh_size / sizeof(*src);
- strtab = (void *)hdr + strsect->sh_offset;
for (ndst = i = 1; i < nsrc; ++i, ++src)
- if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
+ if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) {
unsigned int j = src->st_name;
- while(!__test_and_set_bit(j, strmap) && strtab[j])
+ while (!__test_and_set_bit(j, info->strmap)
+ && info->strtab[j])
++j;
++ndst;
}
/* Append room for core symbols at end of core part. */
- symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
- mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
+ info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
+ mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
/* Put string table section at end of init part of module. */
strsect->sh_flags |= SHF_ALLOC;
strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
- strindex) | INIT_OFFSET_MASK;
- DEBUGP("\t%s\n", secstrings + strsect->sh_name);
+ info->index.str) | INIT_OFFSET_MASK;
+ DEBUGP("\t%s\n", info->secstrings + strsect->sh_name);
/* Append room for core symbols' strings at end of core part. */
- *pstroffs = mod->core_size;
- __set_bit(0, strmap);
- mod->core_size += bitmap_weight(strmap, strsect->sh_size);
-
- return symoffs;
+ info->stroffs = mod->core_size;
+ __set_bit(0, info->strmap);
+ mod->core_size += bitmap_weight(info->strmap, strsect->sh_size);
}
-static void add_kallsyms(struct module *mod,
- Elf_Shdr *sechdrs,
- unsigned int shnum,
- unsigned int symindex,
- unsigned int strindex,
- unsigned long symoffs,
- unsigned long stroffs,
- const char *secstrings,
- unsigned long *strmap)
+static void add_kallsyms(struct module *mod, const struct load_info *info)
{
unsigned int i, ndst;
const Elf_Sym *src;
Elf_Sym *dst;
char *s;
+ Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
- mod->symtab = (void *)sechdrs[symindex].sh_addr;
- mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
- mod->strtab = (void *)sechdrs[strindex].sh_addr;
+ mod->symtab = (void *)symsec->sh_addr;
+ mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
+ /* Make sure we get permanent strtab: don't use info->strtab. */
+ mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
/* Set types up while we still have access to sections. */
for (i = 0; i < mod->num_symtab; i++)
- mod->symtab[i].st_info
- = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
+ mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
- mod->core_symtab = dst = mod->module_core + symoffs;
+ mod->core_symtab = dst = mod->module_core + info->symoffs;
src = mod->symtab;
*dst = *src;
for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
- if (!is_core_symbol(src, sechdrs, shnum))
+ if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum))
continue;
dst[ndst] = *src;
- dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
+ dst[ndst].st_name = bitmap_weight(info->strmap,
+ dst[ndst].st_name);
++ndst;
}
mod->core_num_syms = ndst;
- mod->core_strtab = s = mod->module_core + stroffs;
- for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
- if (test_bit(i, strmap))
+ mod->core_strtab = s = mod->module_core + info->stroffs;
+ for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i)
+ if (test_bit(i, info->strmap))
*++s = mod->strtab[i];
}
#else
-static inline unsigned long layout_symtab(struct module *mod,
- Elf_Shdr *sechdrs,
- unsigned int symindex,
- unsigned int strindex,
- const Elf_Ehdr *hdr,
- const char *secstrings,
- unsigned long *pstroffs,
- unsigned long *strmap)
+static inline void layout_symtab(struct module *mod, struct load_info *info)
{
- return 0;
}
-static inline void add_kallsyms(struct module *mod,
- Elf_Shdr *sechdrs,
- unsigned int shnum,
- unsigned int symindex,
- unsigned int strindex,
- unsigned long symoffs,
- unsigned long stroffs,
- const char *secstrings,
- const unsigned long *strmap)
+static void add_kallsyms(struct module *mod, struct load_info *info)
{
}
#endif /* CONFIG_KALLSYMS */
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",
@@ -2087,65 +2074,47 @@ static void *module_alloc_update_bounds(unsigned long size)
}
#ifdef CONFIG_DEBUG_KMEMLEAK
-static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs, char *secstrings)
+static void kmemleak_load_module(const struct module *mod,
+ const struct load_info *info)
{
unsigned int i;
/* only scan the sections containing data */
kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
- for (i = 1; i < hdr->e_shnum; i++) {
- if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+ for (i = 1; i < info->hdr->e_shnum; i++) {
+ const char *name = info->secstrings + info->sechdrs[i].sh_name;
+ if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
continue;
- if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
- && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
+ if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
continue;
- kmemleak_scan_area((void *)sechdrs[i].sh_addr,
- sechdrs[i].sh_size, GFP_KERNEL);
+ kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
+ info->sechdrs[i].sh_size, GFP_KERNEL);
}
}
#else
-static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs, char *secstrings)
+static inline void kmemleak_load_module(const struct module *mod,
+ const struct load_info *info)
{
}
#endif
-/* 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,
- unsigned long len,
- const char __user *uargs)
+/* Sets info->hdr and info->len. */
+static int copy_and_check(struct load_info *info,
+ const void __user *umod, unsigned long len,
+ const char __user *uargs)
{
+ int err;
Elf_Ehdr *hdr;
- Elf_Shdr *sechdrs;
- char *secstrings, *args, *modmagic, *strtab = NULL;
- char *staging;
- unsigned int i;
- unsigned int symindex = 0;
- unsigned int strindex = 0;
- unsigned int modindex, versindex, infoindex, pcpuindex;
- struct module *mod;
- long err = 0;
- void *ptr = NULL; /* Stops spurious gcc warning */
- unsigned long symoffs, stroffs, *strmap;
- void __percpu *percpu;
- struct _ddebug *debug = NULL;
- unsigned int num_debug = 0;
- mm_segment_t old_fs;
-
- DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
- umod, len, uargs);
if (len < sizeof(*hdr))
- return ERR_PTR(-ENOEXEC);
+ return -ENOEXEC;
/* Suck in entire file: we'll want most of it. */
/* vmalloc barfs on "unusual" numbers. Check here */
if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
if (copy_from_user(hdr, umod, len) != 0) {
err = -EFAULT;
@@ -2153,135 +2122,225 @@ static noinline struct module *load_module(void __user *umod,
}
/* Sanity checks against insmoding binaries or wrong arch,
- weird elf version */
+ weird elf version */
if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
|| hdr->e_type != ET_REL
|| !elf_check_arch(hdr)
- || hdr->e_shentsize != sizeof(*sechdrs)) {
+ || hdr->e_shentsize != sizeof(Elf_Shdr)) {
err = -ENOEXEC;
goto free_hdr;
}
- if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
- goto truncated;
+ if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
+ err = -ENOEXEC;
+ goto free_hdr;
+ }
- /* Convenience variables */
- sechdrs = (void *)hdr + hdr->e_shoff;
- secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
- sechdrs[0].sh_addr = 0;
+ info->hdr = hdr;
+ info->len = len;
+ return 0;
- for (i = 1; i < hdr->e_shnum; i++) {
- if (sechdrs[i].sh_type != SHT_NOBITS
- && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
- goto truncated;
+free_hdr:
+ vfree(hdr);
+ return err;
+}
+
+static void free_copy(struct load_info *info)
+{
+ vfree(info->hdr);
+}
+
+static int rewrite_section_headers(struct load_info *info)
+{
+ unsigned int i;
+
+ /* This should always be true, but let's be sure. */
+ info->sechdrs[0].sh_addr = 0;
+
+ for (i = 1; i < info->hdr->e_shnum; i++) {
+ Elf_Shdr *shdr = &info->sechdrs[i];
+ if (shdr->sh_type != SHT_NOBITS
+ && info->len < shdr->sh_offset + shdr->sh_size) {
+ printk(KERN_ERR "Module len %lu truncated\n",
+ info->len);
+ return -ENOEXEC;
+ }
/* Mark all sections sh_addr with their address in the
temporary image. */
- sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
+ shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
- /* Internal symbols and strings. */
- if (sechdrs[i].sh_type == SHT_SYMTAB) {
- symindex = i;
- strindex = sechdrs[i].sh_link;
- strtab = (char *)hdr + sechdrs[strindex].sh_offset;
- }
#ifndef CONFIG_MODULE_UNLOAD
/* Don't load .exit sections */
- if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
- sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
+ if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
+ shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
#endif
}
- modindex = find_sec(hdr, sechdrs, secstrings,
- ".gnu.linkonce.this_module");
- if (!modindex) {
+ /* Track but don't keep modinfo and version sections. */
+ info->index.vers = find_sec(info, "__versions");
+ info->index.info = find_sec(info, ".modinfo");
+ info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
+ info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
+ return 0;
+}
+
+/*
+ * Set up our basic convenience variables (pointers to section headers,
+ * search for module section index etc), and do some basic section
+ * verification.
+ *
+ * Return the temporary module pointer (we'll replace it with the final
+ * one when we move the module sections around).
+ */
+static struct module *setup_load_info(struct load_info *info)
+{
+ unsigned int i;
+ int err;
+ struct module *mod;
+
+ /* Set up the convenience variables */
+ info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
+ info->secstrings = (void *)info->hdr
+ + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
+
+ err = rewrite_section_headers(info);
+ if (err)
+ return ERR_PTR(err);
+
+ /* Find internal symbols and strings. */
+ for (i = 1; i < info->hdr->e_shnum; i++) {
+ if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
+ info->index.sym = i;
+ info->index.str = info->sechdrs[i].sh_link;
+ info->strtab = (char *)info->hdr
+ + info->sechdrs[info->index.str].sh_offset;
+ break;
+ }
+ }
+
+ info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
+ if (!info->index.mod) {
printk(KERN_WARNING "No module found in object\n");
- err = -ENOEXEC;
- goto free_hdr;
+ return ERR_PTR(-ENOEXEC);
}
/* This is temporary: point mod into copy of data. */
- mod = (void *)sechdrs[modindex].sh_addr;
+ mod = (void *)info->sechdrs[info->index.mod].sh_addr;
- if (symindex == 0) {
+ if (info->index.sym == 0) {
printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
mod->name);
- err = -ENOEXEC;
- goto free_hdr;
+ return ERR_PTR(-ENOEXEC);
}
- versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
- infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
- pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
-
- /* Don't keep modinfo and version sections. */
- sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
- sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
+ info->index.pcpu = find_pcpusec(info);
/* Check module struct version now, before we try to use module. */
- if (!check_modstruct_version(sechdrs, versindex, mod)) {
- err = -ENOEXEC;
- goto free_hdr;
- }
+ if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
+ return ERR_PTR(-ENOEXEC);
+
+ return mod;
+}
+
+static int check_modinfo(struct module *mod, struct load_info *info)
+{
+ const char *modmagic = get_modinfo(info, "vermagic");
+ int err;
- modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
/* This is allowed: modprobe --force will invalidate it. */
if (!modmagic) {
err = try_to_force_load(mod, "bad vermagic");
if (err)
- goto free_hdr;
- } else if (!same_magic(modmagic, vermagic, versindex)) {
+ return err;
+ } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
mod->name, modmagic, vermagic);
- err = -ENOEXEC;
- goto free_hdr;
+ return -ENOEXEC;
}
- staging = get_modinfo(sechdrs, infoindex, "staging");
- if (staging) {
+ if (get_modinfo(info, "staging")) {
add_taint_module(mod, TAINT_CRAP);
printk(KERN_WARNING "%s: module is from the staging directory,"
" the quality is unknown, you have been warned.\n",
mod->name);
}
- /* Now copy in args */
- args = strndup_user(uargs, ~0UL >> 1);
- if (IS_ERR(args)) {
- err = PTR_ERR(args);
- goto free_hdr;
- }
+ /* Set up license info based on the info section */
+ set_license(mod, get_modinfo(info, "license"));
- strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
- * sizeof(long), GFP_KERNEL);
- if (!strmap) {
- err = -ENOMEM;
- goto free_mod;
- }
+ return 0;
+}
- mod->state = MODULE_STATE_COMING;
+static void find_module_sections(struct module *mod, struct load_info *info)
+{
+ mod->kp = section_objs(info, "__param",
+ sizeof(*mod->kp), &mod->num_kp);
+ mod->syms = section_objs(info, "__ksymtab",
+ sizeof(*mod->syms), &mod->num_syms);
+ mod->crcs = section_addr(info, "__kcrctab");
+ mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
+ sizeof(*mod->gpl_syms),
+ &mod->num_gpl_syms);
+ mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
+ mod->gpl_future_syms = section_objs(info,
+ "__ksymtab_gpl_future",
+ sizeof(*mod->gpl_future_syms),
+ &mod->num_gpl_future_syms);
+ mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
- /* Allow arches to frob section contents and sizes. */
- err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
- if (err < 0)
- goto free_mod;
+#ifdef CONFIG_UNUSED_SYMBOLS
+ mod->unused_syms = section_objs(info, "__ksymtab_unused",
+ sizeof(*mod->unused_syms),
+ &mod->num_unused_syms);
+ mod->unused_crcs = section_addr(info, "__kcrctab_unused");
+ mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
+ sizeof(*mod->unused_gpl_syms),
+ &mod->num_unused_gpl_syms);
+ mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
+#endif
+#ifdef CONFIG_CONSTRUCTORS
+ mod->ctors = section_objs(info, ".ctors",
+ sizeof(*mod->ctors), &mod->num_ctors);
+#endif
- if (pcpuindex) {
- /* We have a special allocation for this section. */
- err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
- sechdrs[pcpuindex].sh_addralign);
- if (err)
- goto free_mod;
- sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
- }
- /* Keep this around for failure path. */
- percpu = mod_percpu(mod);
+#ifdef CONFIG_TRACEPOINTS
+ mod->tracepoints = section_objs(info, "__tracepoints",
+ sizeof(*mod->tracepoints),
+ &mod->num_tracepoints);
+#endif
+#ifdef CONFIG_EVENT_TRACING
+ mod->trace_events = section_objs(info, "_ftrace_events",
+ sizeof(*mod->trace_events),
+ &mod->num_trace_events);
+ /*
+ * This section contains pointers to allocated objects in the trace
+ * code and not scanning it leads to false positives.
+ */
+ kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
+ mod->num_trace_events, GFP_KERNEL);
+#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ /* sechdrs[0].sh_size is always zero */
+ mod->ftrace_callsites = section_objs(info, "__mcount_loc",
+ sizeof(*mod->ftrace_callsites),
+ &mod->num_ftrace_callsites);
+#endif
- /* Determine total sizes, and put offsets in sh_entsize. For now
- this is done generically; there doesn't appear to be any
- special cases for the architectures. */
- layout_sections(mod, hdr, sechdrs, secstrings);
- symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
- secstrings, &stroffs, strmap);
+ 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)
+{
+ int i;
+ void *ptr;
/* Do the allocs. */
ptr = module_alloc_update_bounds(mod->core_size);
@@ -2291,10 +2350,9 @@ static noinline struct module *load_module(void __user *umod,
* leak.
*/
kmemleak_not_leak(ptr);
- if (!ptr) {
- err = -ENOMEM;
- goto free_percpu;
- }
+ if (!ptr)
+ return -ENOMEM;
+
memset(ptr, 0, mod->core_size);
mod->module_core = ptr;
@@ -2307,50 +2365,40 @@ static noinline struct module *load_module(void __user *umod,
*/
kmemleak_ignore(ptr);
if (!ptr && mod->init_size) {
- err = -ENOMEM;
- goto free_core;
+ module_free(mod, mod->module_core);
+ return -ENOMEM;
}
memset(ptr, 0, mod->init_size);
mod->module_init = ptr;
/* Transfer each section which specifies SHF_ALLOC */
DEBUGP("final section addresses:\n");
- for (i = 0; i < hdr->e_shnum; i++) {
+ for (i = 0; i < info->hdr->e_shnum; i++) {
void *dest;
+ Elf_Shdr *shdr = &info->sechdrs[i];
- if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+ if (!(shdr->sh_flags & SHF_ALLOC))
continue;
- if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
+ if (shdr->sh_entsize & INIT_OFFSET_MASK)
dest = mod->module_init
- + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
+ + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
else
- dest = mod->module_core + sechdrs[i].sh_entsize;
+ dest = mod->module_core + shdr->sh_entsize;
- if (sechdrs[i].sh_type != SHT_NOBITS)
- memcpy(dest, (void *)sechdrs[i].sh_addr,
- sechdrs[i].sh_size);
+ if (shdr->sh_type != SHT_NOBITS)
+ memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
/* Update sh_addr to point to copy in image. */
- sechdrs[i].sh_addr = (unsigned long)dest;
- DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
- }
- /* Module has been moved. */
- mod = (void *)sechdrs[modindex].sh_addr;
- kmemleak_load_module(mod, hdr, sechdrs, secstrings);
-
-#if defined(CONFIG_MODULE_UNLOAD)
- mod->refptr = alloc_percpu(struct module_ref);
- if (!mod->refptr) {
- err = -ENOMEM;
- goto free_init;
+ shdr->sh_addr = (unsigned long)dest;
+ DEBUGP("\t0x%lx %s\n",
+ shdr->sh_addr, info->secstrings + shdr->sh_name);
}
-#endif
- /* Now we've moved module, initialize linked lists, etc. */
- module_unload_init(mod);
- /* Set up license info based on the info section */
- set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
+ return 0;
+}
+static int check_module_license_and_versions(struct module *mod)
+{
/*
* ndiswrapper is under GPL by itself, but loads proprietary modules.
* Don't use add_taint_module(), as it would prevent ndiswrapper from
@@ -2363,77 +2411,6 @@ static noinline struct module *load_module(void __user *umod,
if (strcmp(mod->name, "driverloader") == 0)
add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
- /* Set up MODINFO_ATTR fields */
- setup_modinfo(mod, sechdrs, infoindex);
-
- /* Fix up syms, so that st_value is a pointer to location. */
- err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
- mod);
- if (err < 0)
- goto cleanup;
-
- /* Now we've got everything in the final locations, we can
- * find optional sections. */
- mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
- sizeof(*mod->kp), &mod->num_kp);
- mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
- sizeof(*mod->syms), &mod->num_syms);
- mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
- mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
- sizeof(*mod->gpl_syms),
- &mod->num_gpl_syms);
- mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
- mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
- "__ksymtab_gpl_future",
- sizeof(*mod->gpl_future_syms),
- &mod->num_gpl_future_syms);
- mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
- "__kcrctab_gpl_future");
-
-#ifdef CONFIG_UNUSED_SYMBOLS
- mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
- "__ksymtab_unused",
- sizeof(*mod->unused_syms),
- &mod->num_unused_syms);
- mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
- "__kcrctab_unused");
- mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
- "__ksymtab_unused_gpl",
- sizeof(*mod->unused_gpl_syms),
- &mod->num_unused_gpl_syms);
- mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
- "__kcrctab_unused_gpl");
-#endif
-#ifdef CONFIG_CONSTRUCTORS
- mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
- sizeof(*mod->ctors), &mod->num_ctors);
-#endif
-
-#ifdef CONFIG_TRACEPOINTS
- mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
- "__tracepoints",
- sizeof(*mod->tracepoints),
- &mod->num_tracepoints);
-#endif
-#ifdef CONFIG_EVENT_TRACING
- mod->trace_events = section_objs(hdr, sechdrs, secstrings,
- "_ftrace_events",
- sizeof(*mod->trace_events),
- &mod->num_trace_events);
- /*
- * This section contains pointers to allocated objects in the trace
- * code and not scanning it leads to false positives.
- */
- kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
- mod->num_trace_events, GFP_KERNEL);
-#endif
-#ifdef CONFIG_FTRACE_MCOUNT_RECORD
- /* sechdrs[0].sh_size is always zero */
- mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
- "__mcount_loc",
- sizeof(*mod->ftrace_callsites),
- &mod->num_ftrace_callsites);
-#endif
#ifdef CONFIG_MODVERSIONS
if ((mod->num_syms && !mod->crcs)
|| (mod->num_gpl_syms && !mod->gpl_crcs)
@@ -2443,56 +2420,16 @@ static noinline struct module *load_module(void __user *umod,
|| (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
#endif
) {
- err = try_to_force_load(mod,
- "no versions for exported symbols");
- if (err)
- goto cleanup;
+ return try_to_force_load(mod,
+ "no versions for exported symbols");
}
#endif
+ return 0;
+}
- /* Now do relocations. */
- for (i = 1; i < hdr->e_shnum; i++) {
- const char *strtab = (char *)sechdrs[strindex].sh_addr;
- unsigned int info = sechdrs[i].sh_info;
-
- /* Not a valid relocation section? */
- if (info >= hdr->e_shnum)
- continue;
-
- /* Don't bother with non-allocated sections */
- if (!(sechdrs[info].sh_flags & SHF_ALLOC))
- continue;
-
- if (sechdrs[i].sh_type == SHT_REL)
- err = apply_relocate(sechdrs, strtab, symindex, i,mod);
- else if (sechdrs[i].sh_type == SHT_RELA)
- err = apply_relocate_add(sechdrs, strtab, symindex, i,
- mod);
- if (err < 0)
- goto cleanup;
- }
-
- /* Set up and sort exception table */
- mod->extable = section_objs(hdr, sechdrs, secstrings, "__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 *)sechdrs[pcpuindex].sh_addr,
- sechdrs[pcpuindex].sh_size);
-
- add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
- symoffs, stroffs, secstrings, strmap);
- kfree(strmap);
- strmap = NULL;
-
- if (!mod->taints)
- debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
- sizeof(*debug), &num_debug);
-
- err = module_finalize(hdr, sechdrs, mod);
- if (err < 0)
- goto cleanup;
+static void flush_module_icache(const struct module *mod)
+{
+ mm_segment_t old_fs;
/* flush the icache in correct context */
old_fs = get_fs();
@@ -2511,11 +2448,160 @@ static noinline struct module *load_module(void __user *umod,
(unsigned long)mod->module_core + mod->core_size);
set_fs(old_fs);
+}
- mod->args = args;
- if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
- printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
- mod->name);
+static struct module *layout_and_allocate(struct load_info *info)
+{
+ /* Module within temporary copy. */
+ struct module *mod;
+ Elf_Shdr *pcpusec;
+ int err;
+
+ mod = setup_load_info(info);
+ if (IS_ERR(mod))
+ return mod;
+
+ err = check_modinfo(mod, info);
+ if (err)
+ return ERR_PTR(err);
+
+ /* Allow arches to frob section contents and sizes. */
+ err = module_frob_arch_sections(info->hdr, info->sechdrs,
+ info->secstrings, mod);
+ if (err < 0)
+ goto out;
+
+ pcpusec = &info->sechdrs[info->index.pcpu];
+ if (pcpusec->sh_size) {
+ /* We have a special allocation for this section. */
+ err = percpu_modalloc(mod,
+ pcpusec->sh_size, pcpusec->sh_addralign);
+ if (err)
+ goto out;
+ pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
+ }
+
+ /* Determine total sizes, and put offsets in sh_entsize. For now
+ this is done generically; there doesn't appear to be any
+ special cases for the architectures. */
+ layout_sections(mod, info);
+
+ info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size)
+ * sizeof(long), GFP_KERNEL);
+ if (!info->strmap) {
+ err = -ENOMEM;
+ goto free_percpu;
+ }
+ layout_symtab(mod, info);
+
+ /* Allocate and move to the final place */
+ err = move_module(mod, info);
+ if (err)
+ goto free_strmap;
+
+ /* Module has been copied to its final place now: return it. */
+ mod = (void *)info->sechdrs[info->index.mod].sh_addr;
+ kmemleak_load_module(mod, info);
+ return mod;
+
+free_strmap:
+ kfree(info->strmap);
+free_percpu:
+ percpu_modfree(mod);
+out:
+ return ERR_PTR(err);
+}
+
+/* mod is no longer valid after this! */
+static void module_deallocate(struct module *mod, struct load_info *info)
+{
+ kfree(info->strmap);
+ percpu_modfree(mod);
+ module_free(mod, mod->module_init);
+ module_free(mod, mod->module_core);
+}
+
+static int post_relocation(struct module *mod, const struct load_info *info)
+{
+ /* Sort exception table now relocations are done. */
+ 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);
+
+ /* Setup kallsyms-specific fields. */
+ 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 struct module *load_module(void __user *umod,
+ unsigned long len,
+ const char __user *uargs)
+{
+ struct load_info info = { NULL, };
+ struct module *mod;
+ long err;
+
+ DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
+ umod, len, uargs);
+
+ /* Copy in the blobs from userspace, check they are vaguely sane. */
+ err = copy_and_check(&info, umod, len, uargs);
+ if (err)
+ return ERR_PTR(err);
+
+ /* Figure out module layout, and allocate all the memory. */
+ mod = layout_and_allocate(&info);
+ if (IS_ERR(mod)) {
+ err = PTR_ERR(mod);
+ goto free_copy;
+ }
+
+ /* Now module is in final location, initialize linked lists, etc. */
+ err = module_unload_init(mod);
+ if (err)
+ goto free_module;
+
+ /* Now we've got everything in the final locations, we can
+ * find optional sections. */
+ find_module_sections(mod, &info);
+
+ err = check_module_license_and_versions(mod);
+ if (err)
+ goto free_unload;
+
+ /* Set up MODINFO_ATTR fields */
+ setup_modinfo(mod, &info);
+
+ /* Fix up syms, so that st_value is a pointer to location. */
+ err = simplify_symbols(mod, &info);
+ if (err < 0)
+ goto free_modinfo;
+
+ err = apply_relocations(mod, &info);
+ if (err < 0)
+ goto free_modinfo;
+
+ err = post_relocation(mod, &info);
+ if (err < 0)
+ goto free_modinfo;
+
+ flush_module_icache(mod);
+
+ /* Now copy in args */
+ mod->args = strndup_user(uargs, ~0UL >> 1);
+ if (IS_ERR(mod->args)) {
+ err = PTR_ERR(mod->args);
+ goto free_arch_cleanup;
+ }
+
+ /* Mark state as coming so strong_try_module_get() ignores us. */
+ mod->state = MODULE_STATE_COMING;
/* Now sew it into the lists so we can get lockdep and oops
* info during argument parsing. Noone should access us, since
@@ -2530,8 +2616,9 @@ 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);
@@ -2541,23 +2628,22 @@ static noinline struct module *load_module(void __user *umod,
list_add_rcu(&mod->list, &modules);
mutex_unlock(&module_mutex);
+ /* Module is ready to execute: parsing args may do that. */
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
if (err < 0)
goto unlink;
- err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
+ /* Link in to syfs. */
+ err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp);
if (err < 0)
goto unlink;
- add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
- add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
-
- /* Get rid of temporary copy */
- vfree(hdr);
-
- trace_module_load(mod);
+ /* Get rid of temporary copy and strmap. */
+ kfree(info.strmap);
+ free_copy(&info);
/* Done! */
+ trace_module_load(mod);
return mod;
unlink:
@@ -2565,35 +2651,23 @@ 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();
+ kfree(mod->args);
+ free_arch_cleanup:
module_arch_cleanup(mod);
- cleanup:
+ free_modinfo:
free_modinfo(mod);
+ free_unload:
module_unload_free(mod);
-#if defined(CONFIG_MODULE_UNLOAD)
- free_percpu(mod->refptr);
- free_init:
-#endif
- module_free(mod, mod->module_init);
- free_core:
- module_free(mod, mod->module_core);
- /* mod will be freed with core. Don't access it beyond this line! */
- free_percpu:
- free_percpu(percpu);
- free_mod:
- kfree(args);
- kfree(strmap);
- free_hdr:
- vfree(hdr);
+ free_module:
+ module_deallocate(mod, &info);
+ free_copy:
+ free_copy(&info);
return ERR_PTR(err);
-
- truncated:
- printk(KERN_ERR "Module len %lu truncated\n", len);
- err = -ENOEXEC;
- goto free_hdr;
}
/* Call module constructors. */