[PATCH 1/2] ARM: kexec: Make .text R/W in machine_kexec

[Nikolay.Borisov@arm.com (Nikolay Borisov)]

With the introduction of Kees Cook's patch to make the kernel .text read-only the
existing method by which kexec works got broken since it directly pokes some
values in the template code, which resides in the .text section.

The current patch changes the way those values are inserted so that poking .text
section occurs only in machine_kexec (e.g when we are about to nuke the old
kernel and are beyond the point of return). This allows to use
set_kernel_text_rw() to directly patch the values in the .text section.

I had already sent a patch which achieved this but it was significantly more
complicated, so this is a cleaner/straight-forward approach.

Tested on 3.15-rc4

Signed-off-by: Nikolay Borisov <Nikolay.Borisov@arm.com>
---
 arch/arm/kernel/machine_kexec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 8cf0996..cee44db 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -29,6 +29,7 @@ extern unsigned long kexec_boot_atags;
 
 static atomic_t waiting_for_crash_ipi;
 
+static unsigned long dt_mem;
 /*
  * Provide a dummy crash_notes definition while crash dump arrives to arm.
  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
@@ -64,7 +65,7 @@ int machine_kexec_prepare(struct kimage *image)
 			return err;
 
 		if (be32_to_cpu(header) == OF_DT_HEADER)
-			kexec_boot_atags = current_segment->mem;
+			dt_mem = current_segment->mem;
 	}
 	return 0;
 }
@@ -163,9 +164,11 @@ void machine_kexec(struct kimage *image)
 	reboot_code_buffer = page_address(image->control_code_page);
 
 	/* Prepare parameters for reboot_code_buffer*/
+	set_kernel_text_rw();
 	kexec_start_address = image->start;
 	kexec_indirection_page = page_list;
 	kexec_mach_type = machine_arch_type;
+	kexec_boot_atags = dt_mem;
 	if (!kexec_boot_atags)
 		kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
 
-- 
1.8.1.5