#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/rculist.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <linux/license.h>
} index;
};
-/* We require a truly strong try_module_get(): 0 means failure due to
- ongoing or failed initialization etc. */
+/*
+ * We require a truly strong try_module_get(): 0 means success.
+ * Otherwise an error is returned due to ongoing or failed
+ * initialization etc.
+ */
static inline int strong_try_module_get(struct module *mod)
{
BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
enum lockdep_ok lockdep_ok)
{
add_taint(flag, lockdep_ok);
- mod->taints |= (1U << flag);
+ set_bit(flag, &mod->taints);
}
/*
extern const struct kernel_symbol __stop___ksymtab_gpl[];
extern const struct kernel_symbol __start___ksymtab_gpl_future[];
extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
-extern const unsigned long __start___kcrctab[];
-extern const unsigned long __start___kcrctab_gpl[];
-extern const unsigned long __start___kcrctab_gpl_future[];
+extern const s32 __start___kcrctab[];
+extern const s32 __start___kcrctab_gpl[];
+extern const s32 __start___kcrctab_gpl_future[];
#ifdef CONFIG_UNUSED_SYMBOLS
extern const struct kernel_symbol __start___ksymtab_unused[];
extern const struct kernel_symbol __stop___ksymtab_unused[];
extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
-extern const unsigned long __start___kcrctab_unused[];
-extern const unsigned long __start___kcrctab_unused_gpl[];
+extern const s32 __start___kcrctab_unused[];
+extern const s32 __start___kcrctab_unused_gpl[];
#endif
#ifndef CONFIG_MODVERSIONS
/* Output */
struct module *owner;
- const unsigned long *crc;
+ const s32 *crc;
const struct kernel_symbol *sym;
};
* (optional) module which owns it. Needs preempt disabled or module_mutex. */
const struct kernel_symbol *find_symbol(const char *name,
struct module **owner,
- const unsigned long **crc,
+ const s32 **crc,
bool gplok,
bool warn)
{
static size_t module_flags_taint(struct module *mod, char *buf)
{
size_t l = 0;
+ int i;
+
+ for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
+ if (taint_flags[i].module && test_bit(i, &mod->taints))
+ buf[l++] = taint_flags[i].c_true;
+ }
- if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
- buf[l++] = 'P';
- if (mod->taints & (1 << TAINT_OOT_MODULE))
- buf[l++] = 'O';
- if (mod->taints & (1 << TAINT_FORCED_MODULE))
- buf[l++] = 'F';
- if (mod->taints & (1 << TAINT_CRAP))
- buf[l++] = 'C';
- if (mod->taints & (1 << TAINT_UNSIGNED_MODULE))
- buf[l++] = 'E';
- if (mod->taints & (1 << TAINT_LIVEPATCH))
- buf[l++] = 'K';
- /*
- * TAINT_FORCED_RMMOD: could be added.
- * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
- * apply to modules.
- */
return l;
}
}
#ifdef CONFIG_MODVERSIONS
-/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
-static unsigned long maybe_relocated(unsigned long crc,
- const struct module *crc_owner)
+
+static u32 resolve_rel_crc(const s32 *crc)
{
-#ifdef ARCH_RELOCATES_KCRCTAB
- if (crc_owner == NULL)
- return crc - (unsigned long)reloc_start;
-#endif
- return crc;
+ return *(u32 *)((void *)crc + *crc);
}
static int check_version(Elf_Shdr *sechdrs,
unsigned int versindex,
const char *symname,
struct module *mod,
- const unsigned long *crc,
- const struct module *crc_owner)
+ const s32 *crc)
{
unsigned int i, num_versions;
struct modversion_info *versions;
/ sizeof(struct modversion_info);
for (i = 0; i < num_versions; i++) {
+ u32 crcval;
+
if (strcmp(versions[i].name, symname) != 0)
continue;
- if (versions[i].crc == maybe_relocated(*crc, crc_owner))
+ if (IS_ENABLED(CONFIG_MODULE_REL_CRCS))
+ crcval = resolve_rel_crc(crc);
+ else
+ crcval = *crc;
+ if (versions[i].crc == crcval)
return 1;
- pr_debug("Found checksum %lX vs module %lX\n",
- maybe_relocated(*crc, crc_owner), versions[i].crc);
+ pr_debug("Found checksum %X vs module %lX\n",
+ crcval, versions[i].crc);
goto bad_version;
}
unsigned int versindex,
struct module *mod)
{
- const unsigned long *crc;
+ const s32 *crc;
/*
* Since this should be found in kernel (which can't be removed), no
}
preempt_enable();
return check_version(sechdrs, versindex,
- VMLINUX_SYMBOL_STR(module_layout), mod, crc,
- NULL);
+ VMLINUX_SYMBOL_STR(module_layout), mod, crc);
}
/* First part is kernel version, which we ignore if module has crcs. */
unsigned int versindex,
const char *symname,
struct module *mod,
- const unsigned long *crc,
- const struct module *crc_owner)
+ const s32 *crc)
{
return 1;
}
{
struct module *owner;
const struct kernel_symbol *sym;
- const unsigned long *crc;
+ const s32 *crc;
int err;
/*
if (!sym)
goto unlock;
- if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
- owner)) {
+ if (!check_version(info->sechdrs, info->index.vers, name, mod, crc)) {
sym = ERR_PTR(-EINVAL);
goto getname;
}
/* livepatching wants to disable read-only so it can frob module. */
void module_disable_ro(const struct module *mod)
{
+ if (!rodata_enabled)
+ return;
+
frob_text(&mod->core_layout, set_memory_rw);
frob_rodata(&mod->core_layout, set_memory_rw);
frob_ro_after_init(&mod->core_layout, set_memory_rw);
void module_enable_ro(const struct module *mod, bool after_init)
{
+ if (!rodata_enabled)
+ return;
+
frob_text(&mod->core_layout, set_memory_ro);
frob_rodata(&mod->core_layout, set_memory_ro);
frob_text(&mod->init_layout, set_memory_ro);
{
struct module *mod;
+ if (!rodata_enabled)
+ return;
+
mutex_lock(&module_mutex);
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
{
struct module *mod;
+ if (!rodata_enabled)
+ return;
+
mutex_lock(&module_mutex);
list_for_each_entry_rcu(mod, &modules, list) {
- if (mod->state == MODULE_STATE_UNFORMED)
+ /*
+ * Ignore going modules since it's possible that ro
+ * protection has already been disabled, otherwise we'll
+ * run into protection faults at module deallocation.
+ */
+ if (mod->state == MODULE_STATE_UNFORMED ||
+ mod->state == MODULE_STATE_GOING)
continue;
frob_text(&mod->core_layout, set_memory_ro);
static void disable_ro_nx(const struct module_layout *layout)
{
- frob_text(layout, set_memory_rw);
- frob_rodata(layout, set_memory_rw);
+ if (rodata_enabled) {
+ frob_text(layout, set_memory_rw);
+ frob_rodata(layout, set_memory_rw);
+ frob_ro_after_init(layout, set_memory_rw);
+ }
frob_rodata(layout, set_memory_x);
- frob_ro_after_init(layout, set_memory_rw);
frob_ro_after_init(layout, set_memory_x);
frob_writable_data(layout, set_memory_x);
}
sysfs_cleanup:
mod_sysfs_teardown(mod);
coming_cleanup:
+ mod->state = MODULE_STATE_GOING;
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_GOING, mod);
klp_module_going(mod);
}
#endif /* CONFIG_KALLSYMS */
+/* Maximum number of characters written by module_flags() */
+#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
+
+/* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */
static char *module_flags(struct module *mod, char *buf)
{
int bx = 0;
static int m_show(struct seq_file *m, void *p)
{
struct module *mod = list_entry(p, struct module, list);
- char buf[8];
+ char buf[MODULE_FLAGS_BUF_SIZE];
/* We always ignore unformed modules. */
if (mod->state == MODULE_STATE_UNFORMED)
void print_modules(void)
{
struct module *mod;
- char buf[8];
+ char buf[MODULE_FLAGS_BUF_SIZE];
printk(KERN_DEFAULT "Modules linked in:");
/* Most callers should already have preempt disabled, but make sure */
projects / linux.git / blobdiff