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| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2016-11-14 07:15:05 +0100 |
|---|---|---|
| committer | Jessica Yu <jeyu@redhat.com> | 2016-11-28 01:15:33 +0100 |
| commit | 39290b389ea2654f9190e3b48c57d27b24def83e (patch) | |
| tree | c56b3f6505001d9c4bf25d5588e79e79f2db0ea8 /init | |
| parent | module: Fix a comment above strong_try_module_get() (diff) | |
| download | linux-39290b389ea2654f9190e3b48c57d27b24def83e.tar.xz linux-39290b389ea2654f9190e3b48c57d27b24def83e.zip | |
module: extend 'rodata=off' boot cmdline parameter to module mappings
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>
Diffstat (limited to 'init')
| -rw-r--r-- | init/main.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/init/main.c b/init/main.c index 2858be732f6d..959a24242988 100644 --- a/init/main.c +++ b/init/main.c @@ -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) |