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module: extend 'rodata=off' boot cmdline parameter to module mappings

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The current "rodata=off" parameter disables read-only kernel mappings
under CONFIG_DEBUG_RODATA:
    commit d2aa1acad2 ("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 <[email protected]>
Signed-off-by: AKASHI Takahiro <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Rusty Russell <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jessica Yu <[email protected]>
This commit is contained in:
AKASHI Takahiro 2016-11-14 15:15:05 +09:00 • committed by Jessica Yu
commit 39290b389e
3 changed files with 25 additions and 5 deletions
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7
init/main.c
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@ -81,6 +81,7 @@
#include <linux/integrity.h>
#include <linux/proc_ns.h>
#include <linux/io.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)