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-rw-r--r--kernel/module.c69
-rw-r--r--kernel/panic.c53
2 files changed, 68 insertions, 54 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 0e54d5bf0097..f7482db0f843 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -313,8 +313,11 @@ struct load_info {
} 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);
@@ -330,7 +333,7 @@ static inline void add_taint_module(struct module *mod, unsigned flag,
enum lockdep_ok lockdep_ok)
{
add_taint(flag, lockdep_ok);
- mod->taints |= (1U << flag);
+ set_bit(flag, &mod->taints);
}
/*
@@ -1138,24 +1141,13 @@ static inline int module_unload_init(struct module *mod)
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].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;
}
@@ -1911,6 +1903,9 @@ static void frob_writable_data(const struct module_layout *layout,
/* 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);
@@ -1920,6 +1915,9 @@ void module_disable_ro(const struct module *mod)
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);
@@ -1952,6 +1950,9 @@ void set_all_modules_text_rw(void)
{
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)
@@ -1968,9 +1969,18 @@ void set_all_modules_text_ro(void)
{
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);
@@ -1981,10 +1991,12 @@ void set_all_modules_text_ro(void)
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);
}
@@ -3709,6 +3721,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
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);
@@ -4042,6 +4055,10 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
}
#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;
@@ -4086,7 +4103,7 @@ static void m_stop(struct seq_file *m, void *p)
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)
@@ -4257,7 +4274,7 @@ EXPORT_SYMBOL_GPL(__module_text_address);
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 */
diff --git a/kernel/panic.c b/kernel/panic.c
index e6480e20379e..c51edaa04fce 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -298,30 +298,27 @@ void panic(const char *fmt, ...)
EXPORT_SYMBOL(panic);
-
-struct tnt {
- u8 bit;
- char true;
- char false;
-};
-
-static const struct tnt tnts[] = {
- { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
- { TAINT_FORCED_MODULE, 'F', ' ' },
- { TAINT_CPU_OUT_OF_SPEC, 'S', ' ' },
- { TAINT_FORCED_RMMOD, 'R', ' ' },
- { TAINT_MACHINE_CHECK, 'M', ' ' },
- { TAINT_BAD_PAGE, 'B', ' ' },
- { TAINT_USER, 'U', ' ' },
- { TAINT_DIE, 'D', ' ' },
- { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
- { TAINT_WARN, 'W', ' ' },
- { TAINT_CRAP, 'C', ' ' },
- { TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
- { TAINT_OOT_MODULE, 'O', ' ' },
- { TAINT_UNSIGNED_MODULE, 'E', ' ' },
- { TAINT_SOFTLOCKUP, 'L', ' ' },
- { TAINT_LIVEPATCH, 'K', ' ' },
+/*
+ * TAINT_FORCED_RMMOD could be a per-module flag but the module
+ * is being removed anyway.
+ */
+const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
+ { 'P', 'G', true }, /* TAINT_PROPRIETARY_MODULE */
+ { 'F', ' ', true }, /* TAINT_FORCED_MODULE */
+ { 'S', ' ', false }, /* TAINT_CPU_OUT_OF_SPEC */
+ { 'R', ' ', false }, /* TAINT_FORCED_RMMOD */
+ { 'M', ' ', false }, /* TAINT_MACHINE_CHECK */
+ { 'B', ' ', false }, /* TAINT_BAD_PAGE */
+ { 'U', ' ', false }, /* TAINT_USER */
+ { 'D', ' ', false }, /* TAINT_DIE */
+ { 'A', ' ', false }, /* TAINT_OVERRIDDEN_ACPI_TABLE */
+ { 'W', ' ', false }, /* TAINT_WARN */
+ { 'C', ' ', true }, /* TAINT_CRAP */
+ { 'I', ' ', false }, /* TAINT_FIRMWARE_WORKAROUND */
+ { 'O', ' ', true }, /* TAINT_OOT_MODULE */
+ { 'E', ' ', true }, /* TAINT_UNSIGNED_MODULE */
+ { 'L', ' ', false }, /* TAINT_SOFTLOCKUP */
+ { 'K', ' ', true }, /* TAINT_LIVEPATCH */
};
/**
@@ -348,16 +345,16 @@ static const struct tnt tnts[] = {
*/
const char *print_tainted(void)
{
- static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ")];
+ static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")];
if (tainted_mask) {
char *s;
int i;
s = buf + sprintf(buf, "Tainted: ");
- for (i = 0; i < ARRAY_SIZE(tnts); i++) {
- const struct tnt *t = &tnts[i];
- *s++ = test_bit(t->bit, &tainted_mask) ?
+ for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
+ const struct taint_flag *t = &taint_flags[i];
+ *s++ = test_bit(i, &tainted_mask) ?
t->true : t->false;
}
*s = 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 14:13:48 +0000