# define debug_align(X) (X)
#endif
-/*
- * Given BASE and SIZE this macro calculates the number of pages the
- * memory regions occupies
- */
-#define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
- (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
- PFN_DOWN((unsigned long)BASE) + 1) \
- : (0UL))
-
/* If this is set, the section belongs in the init part of the module */
#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
* Use a latched RB-tree for __module_address(); this allows us to use
* RCU-sched lookups of the address from any context.
*
- * Because modules have two address ranges: init and core, we need two
- * latch_tree_nodes entries. Therefore we need the back-pointer from
- * mod_tree_node.
- *
- * Because init ranges are short lived we mark them unlikely and have placed
- * them outside the critical cacheline in struct module.
- *
* This is conditional on PERF_EVENTS || TRACING because those can really hit
* __module_address() hard by doing a lot of stack unwinding; potentially from
* NMI context.
static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n)
{
- struct mod_tree_node *mtn = container_of(n, struct mod_tree_node, node);
- struct module *mod = mtn->mod;
+ struct module_layout *layout = container_of(n, struct module_layout, mtn.node);
- if (unlikely(mtn == &mod->mtn_init))
- return (unsigned long)mod->module_init;
-
- return (unsigned long)mod->module_core;
+ return (unsigned long)layout->base;
}
static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n)
{
- struct mod_tree_node *mtn = container_of(n, struct mod_tree_node, node);
- struct module *mod = mtn->mod;
-
- if (unlikely(mtn == &mod->mtn_init))
- return (unsigned long)mod->init_size;
+ struct module_layout *layout = container_of(n, struct module_layout, mtn.node);
- return (unsigned long)mod->core_size;
+ return (unsigned long)layout->size;
}
static __always_inline bool
*/
static void mod_tree_insert(struct module *mod)
{
- mod->mtn_core.mod = mod;
- mod->mtn_init.mod = mod;
+ mod->core_layout.mtn.mod = mod;
+ mod->init_layout.mtn.mod = mod;
- __mod_tree_insert(&mod->mtn_core);
- if (mod->init_size)
- __mod_tree_insert(&mod->mtn_init);
+ __mod_tree_insert(&mod->core_layout.mtn);
+ if (mod->init_layout.size)
+ __mod_tree_insert(&mod->init_layout.mtn);
}
static void mod_tree_remove_init(struct module *mod)
{
- if (mod->init_size)
- __mod_tree_remove(&mod->mtn_init);
+ if (mod->init_layout.size)
+ __mod_tree_remove(&mod->init_layout.mtn);
}
static void mod_tree_remove(struct module *mod)
{
- __mod_tree_remove(&mod->mtn_core);
+ __mod_tree_remove(&mod->core_layout.mtn);
mod_tree_remove_init(mod);
}
static void mod_update_bounds(struct module *mod)
{
- __mod_update_bounds(mod->module_core, mod->core_size);
- if (mod->init_size)
- __mod_update_bounds(mod->module_init, mod->init_size);
+ __mod_update_bounds(mod->core_layout.base, mod->core_layout.size);
+ if (mod->init_layout.size)
+ __mod_update_bounds(mod->init_layout.base, mod->init_layout.size);
}
#ifdef CONFIG_KGDB_KDB
static ssize_t show_coresize(struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
- return sprintf(buffer, "%u\n", mk->mod->core_size);
+ return sprintf(buffer, "%u\n", mk->mod->core_layout.size);
}
static struct module_attribute modinfo_coresize =
static ssize_t show_initsize(struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
- return sprintf(buffer, "%u\n", mk->mod->init_size);
+ return sprintf(buffer, "%u\n", mk->mod->init_layout.size);
}
static struct module_attribute modinfo_initsize =
/*
* LKM RO/NX protection: protect module's text/ro-data
* from modification and any data from execution.
+ *
+ * General layout of module is:
+ * [text] [read-only-data] [writable data]
+ * text_size -----^ ^ ^
+ * ro_size ------------------------| |
+ * size -------------------------------------------|
+ *
+ * These values are always page-aligned (as is base)
*/
-void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
+static void frob_text(const struct module_layout *layout,
+ int (*set_memory)(unsigned long start, int num_pages))
{
- unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
- unsigned long end_pfn = PFN_DOWN((unsigned long)end);
+ BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
+ BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1));
+ set_memory((unsigned long)layout->base,
+ layout->text_size >> PAGE_SHIFT);
+}
- if (end_pfn > begin_pfn)
- set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
+static void frob_rodata(const struct module_layout *layout,
+ int (*set_memory)(unsigned long start, int num_pages))
+{
+ BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
+ BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1));
+ BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1));
+ set_memory((unsigned long)layout->base + layout->text_size,
+ (layout->ro_size - layout->text_size) >> PAGE_SHIFT);
}
-static void set_section_ro_nx(void *base,
- unsigned long text_size,
- unsigned long ro_size,
- unsigned long total_size)
+static void frob_writable_data(const struct module_layout *layout,
+ int (*set_memory)(unsigned long start, int num_pages))
{
- /* begin and end PFNs of the current subsection */
- unsigned long begin_pfn;
- unsigned long end_pfn;
+ BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1));
+ BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1));
+ BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1));
+ set_memory((unsigned long)layout->base + layout->ro_size,
+ (layout->size - layout->ro_size) >> PAGE_SHIFT);
+}
- /*
- * Set RO for module text and RO-data:
- * - Always protect first page.
- * - Do not protect last partial page.
- */
- if (ro_size > 0)
- set_page_attributes(base, base + ro_size, set_memory_ro);
+/* livepatching wants to disable read-only so it can frob module. */
+void module_disable_ro(const struct module *mod)
+{
+ frob_text(&mod->core_layout, set_memory_rw);
+ frob_rodata(&mod->core_layout, set_memory_rw);
+ frob_text(&mod->init_layout, set_memory_rw);
+ frob_rodata(&mod->init_layout, set_memory_rw);
+}
- /*
- * Set NX permissions for module data:
- * - Do not protect first partial page.
- * - Always protect last page.
- */
- if (total_size > text_size) {
- begin_pfn = PFN_UP((unsigned long)base + text_size);
- end_pfn = PFN_UP((unsigned long)base + total_size);
- if (end_pfn > begin_pfn)
- set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
- }
+void module_enable_ro(const struct module *mod)
+{
+ frob_text(&mod->core_layout, set_memory_ro);
+ frob_rodata(&mod->core_layout, set_memory_ro);
+ frob_text(&mod->init_layout, set_memory_ro);
+ frob_rodata(&mod->init_layout, set_memory_ro);
}
-static void unset_module_core_ro_nx(struct module *mod)
+static void module_enable_nx(const struct module *mod)
{
- 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);
+ frob_rodata(&mod->core_layout, set_memory_nx);
+ frob_writable_data(&mod->core_layout, set_memory_nx);
+ frob_rodata(&mod->init_layout, set_memory_nx);
+ frob_writable_data(&mod->init_layout, set_memory_nx);
}
-static void unset_module_init_ro_nx(struct module *mod)
+static void module_disable_nx(const 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);
+ frob_rodata(&mod->core_layout, set_memory_x);
+ frob_writable_data(&mod->core_layout, set_memory_x);
+ frob_rodata(&mod->init_layout, set_memory_x);
+ frob_writable_data(&mod->init_layout, set_memory_x);
}
/* Iterate through all modules and set each module's text as RW */
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
- if ((mod->module_core) && (mod->core_text_size)) {
- set_page_attributes(mod->module_core,
- mod->module_core + mod->core_text_size,
- set_memory_rw);
- }
- if ((mod->module_init) && (mod->init_text_size)) {
- set_page_attributes(mod->module_init,
- mod->module_init + mod->init_text_size,
- set_memory_rw);
- }
+
+ frob_text(&mod->core_layout, set_memory_rw);
+ frob_text(&mod->init_layout, set_memory_rw);
}
mutex_unlock(&module_mutex);
}
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
- if ((mod->module_core) && (mod->core_text_size)) {
- set_page_attributes(mod->module_core,
- mod->module_core + mod->core_text_size,
- set_memory_ro);
- }
- if ((mod->module_init) && (mod->init_text_size)) {
- set_page_attributes(mod->module_init,
- mod->module_init + mod->init_text_size,
- set_memory_ro);
- }
+
+ frob_text(&mod->core_layout, set_memory_ro);
+ frob_text(&mod->init_layout, set_memory_ro);
}
mutex_unlock(&module_mutex);
}
+
+static void disable_ro_nx(const struct module_layout *layout)
+{
+ frob_text(layout, set_memory_rw);
+ frob_rodata(layout, set_memory_rw);
+ frob_rodata(layout, set_memory_x);
+ frob_writable_data(layout, set_memory_x);
+}
+
#else
-static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
-static void unset_module_core_ro_nx(struct module *mod) { }
-static void unset_module_init_ro_nx(struct module *mod) { }
+static void disable_ro_nx(const struct module_layout *layout) { }
+static void module_enable_nx(const struct module *mod) { }
+static void module_disable_nx(const struct module *mod) { }
#endif
void __weak module_memfree(void *module_region)
synchronize_sched();
mutex_unlock(&module_mutex);
- /* This may be NULL, but that's OK */
- unset_module_init_ro_nx(mod);
+ /* This may be empty, but that's OK */
+ disable_ro_nx(&mod->init_layout);
module_arch_freeing_init(mod);
- module_memfree(mod->module_init);
+ module_memfree(mod->init_layout.base);
kfree(mod->args);
percpu_modfree(mod);
/* Free lock-classes; relies on the preceding sync_rcu(). */
- lockdep_free_key_range(mod->module_core, mod->core_size);
+ lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size);
/* Finally, free the core (containing the module structure) */
- unset_module_core_ro_nx(mod);
- module_memfree(mod->module_core);
+ disable_ro_nx(&mod->core_layout);
+ module_memfree(mod->core_layout.base);
#ifdef CONFIG_MPU
update_protections(current->mm);
|| s->sh_entsize != ~0UL
|| strstarts(sname, ".init"))
continue;
- s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
+ s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i);
pr_debug("\t%s\n", sname);
}
switch (m) {
case 0: /* executable */
- mod->core_size = debug_align(mod->core_size);
- mod->core_text_size = mod->core_size;
+ mod->core_layout.size = debug_align(mod->core_layout.size);
+ mod->core_layout.text_size = mod->core_layout.size;
break;
case 1: /* RO: text and ro-data */
- mod->core_size = debug_align(mod->core_size);
- mod->core_ro_size = mod->core_size;
+ mod->core_layout.size = debug_align(mod->core_layout.size);
+ mod->core_layout.ro_size = mod->core_layout.size;
break;
case 3: /* whole core */
- mod->core_size = debug_align(mod->core_size);
+ mod->core_layout.size = debug_align(mod->core_layout.size);
break;
}
}
|| s->sh_entsize != ~0UL
|| !strstarts(sname, ".init"))
continue;
- s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
+ s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i)
| INIT_OFFSET_MASK);
pr_debug("\t%s\n", sname);
}
switch (m) {
case 0: /* executable */
- mod->init_size = debug_align(mod->init_size);
- mod->init_text_size = mod->init_size;
+ mod->init_layout.size = debug_align(mod->init_layout.size);
+ mod->init_layout.text_size = mod->init_layout.size;
break;
case 1: /* RO: text and ro-data */
- mod->init_size = debug_align(mod->init_size);
- mod->init_ro_size = mod->init_size;
+ mod->init_layout.size = debug_align(mod->init_layout.size);
+ mod->init_layout.ro_size = mod->init_layout.size;
break;
case 3: /* whole init */
- mod->init_size = debug_align(mod->init_size);
+ mod->init_layout.size = debug_align(mod->init_layout.size);
break;
}
}
}
if (sym->st_shndx == SHN_UNDEF)
return 'U';
- if (sym->st_shndx == SHN_ABS)
+ if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu)
return 'a';
if (sym->st_shndx >= SHN_LORESERVE)
return '?';
}
static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
- unsigned int shnum)
+ unsigned int shnum, unsigned int pcpundx)
{
const Elf_Shdr *sec;
|| !src->st_name)
return false;
+#ifdef CONFIG_KALLSYMS_ALL
+ if (src->st_shndx == pcpundx)
+ return true;
+#endif
+
sec = sechdrs + src->st_shndx;
if (!(sec->sh_flags & SHF_ALLOC)
#ifndef CONFIG_KALLSYMS_ALL
/* 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,
+ symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect,
info->index.sym) | INIT_OFFSET_MASK;
pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
/* Compute total space required for the core symbols' strtab. */
for (ndst = i = 0; i < nsrc; i++) {
if (i == 0 ||
- is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
+ is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum,
+ info->index.pcpu)) {
strtab_size += strlen(&info->strtab[src[i].st_name])+1;
ndst++;
}
}
/* Append room for core symbols at end of core part. */
- info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
- info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
- mod->core_size += strtab_size;
- mod->core_size = debug_align(mod->core_size);
+ info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1);
+ info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym);
+ mod->core_layout.size += strtab_size;
+ mod->core_layout.size = debug_align(mod->core_layout.size);
/* 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,
+ strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect,
info->index.str) | INIT_OFFSET_MASK;
- mod->init_size = debug_align(mod->init_size);
+ mod->init_layout.size = debug_align(mod->init_layout.size);
pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
}
for (i = 0; i < mod->num_symtab; i++)
mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
- mod->core_symtab = dst = mod->module_core + info->symoffs;
- mod->core_strtab = s = mod->module_core + info->stroffs;
+ mod->core_symtab = dst = mod->core_layout.base + info->symoffs;
+ mod->core_strtab = s = mod->core_layout.base + info->stroffs;
src = mod->symtab;
for (ndst = i = 0; i < mod->num_symtab; i++) {
if (i == 0 ||
- is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
+ is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum,
+ info->index.pcpu)) {
dst[ndst] = src[i];
dst[ndst++].st_name = s - mod->core_strtab;
s += strlcpy(s, &mod->strtab[src[i].st_name],
void *ptr;
/* Do the allocs. */
- ptr = module_alloc(mod->core_size);
+ ptr = module_alloc(mod->core_layout.size);
/*
* The pointer to this block is stored in the module structure
* which is inside the block. Just mark it as not being a
if (!ptr)
return -ENOMEM;
- memset(ptr, 0, mod->core_size);
- mod->module_core = ptr;
+ memset(ptr, 0, mod->core_layout.size);
+ mod->core_layout.base = ptr;
- if (mod->init_size) {
- ptr = module_alloc(mod->init_size);
+ if (mod->init_layout.size) {
+ ptr = module_alloc(mod->init_layout.size);
/*
* The pointer to this block is stored in the module structure
* which is inside the block. This block doesn't need to be
*/
kmemleak_ignore(ptr);
if (!ptr) {
- module_memfree(mod->module_core);
+ module_memfree(mod->core_layout.base);
return -ENOMEM;
}
- memset(ptr, 0, mod->init_size);
- mod->module_init = ptr;
+ memset(ptr, 0, mod->init_layout.size);
+ mod->init_layout.base = ptr;
} else
- mod->module_init = NULL;
+ mod->init_layout.base = NULL;
/* Transfer each section which specifies SHF_ALLOC */
pr_debug("final section addresses:\n");
continue;
if (shdr->sh_entsize & INIT_OFFSET_MASK)
- dest = mod->module_init
+ dest = mod->init_layout.base
+ (shdr->sh_entsize & ~INIT_OFFSET_MASK);
else
- dest = mod->module_core + shdr->sh_entsize;
+ dest = mod->core_layout.base + shdr->sh_entsize;
if (shdr->sh_type != SHT_NOBITS)
memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
* Do it before processing of module parameters, so the module
* can provide parameter accessor functions of its own.
*/
- if (mod->module_init)
- flush_icache_range((unsigned long)mod->module_init,
- (unsigned long)mod->module_init
- + mod->init_size);
- flush_icache_range((unsigned long)mod->module_core,
- (unsigned long)mod->module_core + mod->core_size);
+ if (mod->init_layout.base)
+ flush_icache_range((unsigned long)mod->init_layout.base,
+ (unsigned long)mod->init_layout.base
+ + mod->init_layout.size);
+ flush_icache_range((unsigned long)mod->core_layout.base,
+ (unsigned long)mod->core_layout.base + mod->core_layout.size);
set_fs(old_fs);
}
{
percpu_modfree(mod);
module_arch_freeing_init(mod);
- module_memfree(mod->module_init);
- module_memfree(mod->module_core);
+ module_memfree(mod->init_layout.base);
+ module_memfree(mod->core_layout.base);
}
int __weak module_finalize(const Elf_Ehdr *hdr,
ret = -ENOMEM;
goto fail;
}
- freeinit->module_init = mod->module_init;
+ freeinit->module_init = mod->init_layout.base;
/*
* We want to find out whether @mod uses async during init. Clear
mod->strtab = mod->core_strtab;
#endif
mod_tree_remove_init(mod);
- unset_module_init_ro_nx(mod);
+ disable_ro_nx(&mod->init_layout);
module_arch_freeing_init(mod);
- mod->module_init = NULL;
- mod->init_size = 0;
- mod->init_ro_size = 0;
- mod->init_text_size = 0;
+ mod->init_layout.base = NULL;
+ mod->init_layout.size = 0;
+ mod->init_layout.ro_size = 0;
+ mod->init_layout.text_size = 0;
/*
* We want to free module_init, but be aware that kallsyms may be
* walking this with preempt disabled. In all the failure paths, we
/* This relies on module_mutex for list integrity. */
module_bug_finalize(info->hdr, info->sechdrs, mod);
- /* Set RO and NX regions for core */
- set_section_ro_nx(mod->module_core,
- mod->core_text_size,
- mod->core_ro_size,
- mod->core_size);
-
- /* Set RO and NX regions for init */
- set_section_ro_nx(mod->module_init,
- mod->init_text_size,
- mod->init_ro_size,
- mod->init_size);
+ /* Set RO and NX regions */
+ module_enable_ro(mod);
+ module_enable_nx(mod);
/* Mark state as coming so strong_try_module_get() ignores us,
* but kallsyms etc. can see us. */
MODULE_STATE_GOING, mod);
/* we can't deallocate the module until we clear memory protection */
- unset_module_init_ro_nx(mod);
- unset_module_core_ro_nx(mod);
+ module_disable_ro(mod);
+ module_disable_nx(mod);
ddebug_cleanup:
dynamic_debug_remove(info->debug);
*/
ftrace_release_mod(mod);
/* Free lock-classes; relies on the preceding sync_rcu() */
- lockdep_free_key_range(mod->module_core, mod->core_size);
+ lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size);
module_deallocate(mod, info);
free_copy:
/* At worse, next value is at end of module */
if (within_module_init(addr, mod))
- nextval = (unsigned long)mod->module_init+mod->init_text_size;
+ nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size;
else
- nextval = (unsigned long)mod->module_core+mod->core_text_size;
+ nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size;
/* Scan for closest preceding symbol, and next symbol. (ELF
starts real symbols at 1). */
return 0;
seq_printf(m, "%s %u",
- mod->name, mod->init_size + mod->core_size);
+ mod->name, mod->init_layout.size + mod->core_layout.size);
print_unload_info(m, mod);
/* Informative for users. */
mod->state == MODULE_STATE_COMING ? "Loading" :
"Live");
/* Used by oprofile and other similar tools. */
- seq_printf(m, " 0x%pK", mod->module_core);
+ seq_printf(m, " 0x%pK", mod->core_layout.base);
/* Taints info */
if (mod->taints)
struct module *mod = __module_address(addr);
if (mod) {
/* Make sure it's within the text section. */
- if (!within(addr, mod->module_init, mod->init_text_size)
- && !within(addr, mod->module_core, mod->core_text_size))
+ if (!within(addr, mod->init_layout.base, mod->init_layout.text_size)
+ && !within(addr, mod->core_layout.base, mod->core_layout.text_size))
mod = NULL;
}
return mod;
projects / cascardo / linux.git / blobdiff