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Subject[PATCH 08/29] module: extend 'rodata=off' boot cmdline parameter to module mappings
Date
From: AKASHI Takahiro <takahiro.akashi@linaro.org>

commit 39290b389ea upstream.

The current "rodata=off" parameter disables read-only kernel mappings
under CONFIG_DEBUG_RODATA:
commit d2aa1acad22f ("mm/init: Add 'rodata=off' boot cmdline parameter
to disable read-only kernel mappings")

This patch is a logical extension to module mappings ie. read-only mappings
at module loading can be disabled even if CONFIG_DEBUG_SET_MODULE_RONX
(mainly for debug use). Please note, however, that it only affects RO/RW
permissions, keeping NX set.

This is the first step to make CONFIG_DEBUG_SET_MODULE_RONX mandatory
(always-on) in the future as CONFIG_DEBUG_RODATA on x86 and arm64.

Suggested-by: and Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Link: http://lkml.kernel.org/r/20161114061505.15238-1-takahiro.akashi@linaro.org
Signed-off-by: Jessica Yu <jeyu@redhat.com>
Signed-off-by: Alex Shi <alex.shi@linaro.org>

Conflicts:
keeping kaiser.h in init/main.c
---
include/linux/init.h | 3 +++
init/main.c | 7 +++++--
kernel/module.c | 20 +++++++++++++++++---
3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 8e346d1..4dfe300 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -133,6 +133,9 @@ void prepare_namespace(void);
void __init load_default_modules(void);
int __init init_rootfs(void);

+#if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_DEBUG_SET_MODULE_RONX)
+extern bool rodata_enabled;
+#endif
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void);
#endif
diff --git a/init/main.c b/init/main.c
index 99f0265..f22957a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -81,6 +81,7 @@
#include <linux/proc_ns.h>
#include <linux/io.h>
#include <linux/kaiser.h>
+#include <linux/cache.h>

#include <asm/io.h>
#include <asm/bugs.h>
@@ -914,14 +915,16 @@ static int try_to_run_init_process(const char *init_filename)

static noinline void __init kernel_init_freeable(void);

-#ifdef CONFIG_DEBUG_RODATA
-static bool rodata_enabled = true;
+#if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_SET_MODULE_RONX)
+bool rodata_enabled __ro_after_init = true;
static int __init set_debug_rodata(char *str)
{
return strtobool(str, &rodata_enabled);
}
__setup("rodata=", set_debug_rodata);
+#endif

+#ifdef CONFIG_DEBUG_RODATA
static void mark_readonly(void)
{
if (rodata_enabled)
diff --git a/kernel/module.c b/kernel/module.c
index 07bfb99..0651f2d 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1911,6 +1911,9 @@ 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 +1923,9 @@ 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 +1958,9 @@ 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)
@@ -1968,6 +1977,9 @@ 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)
@@ -1981,10 +1993,12 @@ 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);
}
--
2.7.4
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