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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2018-04-03 12:09:03 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-08 12:12:52 +0200
commit7f9a93b30bcb7d78f09c86ed47aa86f7340e42e8 (patch)
treebf8dca0b30c205afce794d102552d640003aeda1 /init
parente355d4b6a2757a72826383c32b88eb2e76e77f66 (diff)
module: extend 'rodata=off' boot cmdline parameter to module mappings
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> [v4.9 backport] Signed-off-by: Mark Rutland <mark.rutland@arm.com> [v4.9 backport] Tested-by: Will Deacon <will.deacon@arm.com> Tested-by: Greg Hackmann <ghackmann@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/main.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/init/main.c b/init/main.c
index 99f026565608..f22957afb37e 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)