summaryrefslogtreecommitdiff
path: root/kernel/module.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c157
1 files changed, 130 insertions, 27 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 4edbd9c11ac..0e2da8695f8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -58,6 +58,8 @@
#include <linux/jump_label.h>
#include <linux/pfn.h>
#include <linux/bsearch.h>
+#include <linux/fips.h>
+#include "module-internal.h"
#define CREATE_TRACE_POINTS
#include <trace/events/module.h>
@@ -102,6 +104,43 @@ static LIST_HEAD(modules);
struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
#endif /* CONFIG_KGDB_KDB */
+#ifdef CONFIG_MODULE_SIG
+#ifdef CONFIG_MODULE_SIG_FORCE
+static bool sig_enforce = true;
+#else
+static bool sig_enforce = false;
+
+static int param_set_bool_enable_only(const char *val,
+ const struct kernel_param *kp)
+{
+ int err;
+ bool test;
+ struct kernel_param dummy_kp = *kp;
+
+ dummy_kp.arg = &test;
+
+ err = param_set_bool(val, &dummy_kp);
+ if (err)
+ return err;
+
+ /* Don't let them unset it once it's set! */
+ if (!test && sig_enforce)
+ return -EROFS;
+
+ if (test)
+ sig_enforce = true;
+ return 0;
+}
+
+static const struct kernel_param_ops param_ops_bool_enable_only = {
+ .set = param_set_bool_enable_only,
+ .get = param_get_bool,
+};
+#define param_check_bool_enable_only param_check_bool
+
+module_param(sig_enforce, bool_enable_only, 0644);
+#endif /* !CONFIG_MODULE_SIG_FORCE */
+#endif /* CONFIG_MODULE_SIG */
/* Block module loading/unloading? */
int modules_disabled = 0;
@@ -136,6 +175,7 @@ struct load_info {
unsigned long symoffs, stroffs;
struct _ddebug *debug;
unsigned int num_debug;
+ bool sig_ok;
struct {
unsigned int sym, str, mod, vers, info, pcpu;
} index;
@@ -1949,26 +1989,6 @@ static int simplify_symbols(struct module *mod, const struct load_info *info)
return ret;
}
-int __weak apply_relocate(Elf_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
-{
- pr_err("module %s: REL relocation unsupported\n", me->name);
- return -ENOEXEC;
-}
-
-int __weak apply_relocate_add(Elf_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
-{
- pr_err("module %s: RELA relocation unsupported\n", me->name);
- return -ENOEXEC;
-}
-
static int apply_relocations(struct module *mod, const struct load_info *info)
{
unsigned int i;
@@ -2399,7 +2419,52 @@ static inline void kmemleak_load_module(const struct module *mod,
}
#endif
-/* Sets info->hdr and info->len. */
+#ifdef CONFIG_MODULE_SIG
+static int module_sig_check(struct load_info *info,
+ const void *mod, unsigned long *len)
+{
+ int err = -ENOKEY;
+ const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
+ const void *p = mod, *end = mod + *len;
+
+ /* Poor man's memmem. */
+ while ((p = memchr(p, MODULE_SIG_STRING[0], end - p))) {
+ if (p + markerlen > end)
+ break;
+
+ if (memcmp(p, MODULE_SIG_STRING, markerlen) == 0) {
+ const void *sig = p + markerlen;
+ /* Truncate module up to signature. */
+ *len = p - mod;
+ err = mod_verify_sig(mod, *len, sig, end - sig);
+ break;
+ }
+ p++;
+ }
+
+ if (!err) {
+ info->sig_ok = true;
+ return 0;
+ }
+
+ /* Not having a signature is only an error if we're strict. */
+ if (err < 0 && fips_enabled)
+ panic("Module verification failed with error %d in FIPS mode\n",
+ err);
+ if (err == -ENOKEY && !sig_enforce)
+ err = 0;
+
+ return err;
+}
+#else /* !CONFIG_MODULE_SIG */
+static int module_sig_check(struct load_info *info,
+ void *mod, unsigned long *len)
+{
+ return 0;
+}
+#endif /* !CONFIG_MODULE_SIG */
+
+/* Sets info->hdr, info->len and info->sig_ok. */
static int copy_and_check(struct load_info *info,
const void __user *umod, unsigned long len,
const char __user *uargs)
@@ -2419,6 +2484,10 @@ static int copy_and_check(struct load_info *info,
goto free_hdr;
}
+ err = module_sig_check(info, hdr, &len);
+ if (err)
+ goto free_hdr;
+
/* Sanity checks against insmoding binaries or wrong arch,
weird elf version */
if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
@@ -2730,6 +2799,10 @@ static int check_module_license_and_versions(struct module *mod)
if (strcmp(mod->name, "driverloader") == 0)
add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
+ /* lve claims to be GPL but upstream won't provide source */
+ if (strcmp(mod->name, "lve") == 0)
+ add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
+
#ifdef CONFIG_MODVERSIONS
if ((mod->num_syms && !mod->crcs)
|| (mod->num_gpl_syms && !mod->gpl_crcs)
@@ -2861,6 +2934,20 @@ static int post_relocation(struct module *mod, const struct load_info *info)
return module_finalize(info->hdr, info->sechdrs, mod);
}
+/* Is this module of this name done loading? No locks held. */
+static bool finished_loading(const char *name)
+{
+ struct module *mod;
+ bool ret;
+
+ mutex_lock(&module_mutex);
+ mod = find_module(name);
+ ret = !mod || mod->state != MODULE_STATE_COMING;
+ mutex_unlock(&module_mutex);
+
+ return ret;
+}
+
/* 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,
@@ -2868,7 +2955,7 @@ static struct module *load_module(void __user *umod,
const char __user *uargs)
{
struct load_info info = { NULL, };
- struct module *mod;
+ struct module *mod, *old;
long err;
pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n",
@@ -2886,6 +2973,12 @@ static struct module *load_module(void __user *umod,
goto free_copy;
}
+#ifdef CONFIG_MODULE_SIG
+ mod->sig_ok = info.sig_ok;
+ if (!mod->sig_ok)
+ add_taint_module(mod, TAINT_FORCED_MODULE);
+#endif
+
/* Now module is in final location, initialize linked lists, etc. */
err = module_unload_init(mod);
if (err)
@@ -2934,8 +3027,18 @@ static struct module *load_module(void __user *umod,
* function to insert in a way safe to concurrent readers.
* The mutex protects against concurrent writers.
*/
+again:
mutex_lock(&module_mutex);
- if (find_module(mod->name)) {
+ if ((old = find_module(mod->name)) != NULL) {
+ if (old->state == MODULE_STATE_COMING) {
+ /* Wait in case it fails to load. */
+ mutex_unlock(&module_mutex);
+ err = wait_event_interruptible(module_wq,
+ finished_loading(mod->name));
+ if (err)
+ goto free_arch_cleanup;
+ goto again;
+ }
err = -EEXIST;
goto unlock;
}
@@ -2975,7 +3078,7 @@ static struct module *load_module(void __user *umod,
/* Unlink carefully: kallsyms could be walking list. */
list_del_rcu(&mod->list);
module_bug_cleanup(mod);
-
+ wake_up_all(&module_wq);
ddebug:
dynamic_debug_remove(info.debug);
unlock:
@@ -3050,7 +3153,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_GOING, mod);
free_module(mod);
- wake_up(&module_wq);
+ wake_up_all(&module_wq);
return ret;
}
if (ret > 0) {
@@ -3062,9 +3165,8 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
dump_stack();
}
- /* Now it's a first class citizen! Wake up anyone waiting for it. */
+ /* Now it's a first class citizen! */
mod->state = MODULE_STATE_LIVE;
- wake_up(&module_wq);
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_LIVE, mod);
@@ -3087,6 +3189,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
mod->init_ro_size = 0;
mod->init_text_size = 0;
mutex_unlock(&module_mutex);
+ wake_up_all(&module_wq);
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 18:15:53 +0000