[PULL,2/2] mips/malta: load the initrd at the end of the low memory

Commit Message

Yongbok Kim July 11, 2017, 3:16 p.m. UTC

From: Aurelien Jarno <[e-mail]>

Currently the malta board is loading the initrd just after the kernel.
This doesn't work for kaslr enabled kernels, as the initrd ends-up being
overwritten.

Move the initrd at the end of the low memory, that should leave a
sufficient gap for kaslr.

Signed-off-by: Aurelien Jarno <[e-mail]>
Tested-by: Yongbok Kim <[e-mail]>
Signed-off-by: Yongbok Kim <[e-mail]>
---
 hw/mips/mips_malta.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch

diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index 95cdabb..dad2f37 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -841,8 +841,9 @@  static int64_t load_kernel (void)
     if (loaderparams.initrd_filename) {
         initrd_size = get_image_size (loaderparams.initrd_filename);
         if (initrd_size > 0) {
-            initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
-            if (initrd_offset + initrd_size > ram_size) {
+            initrd_offset = (loaderparams.ram_low_size - initrd_size
+                             - ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
+            if (kernel_high >= initrd_offset) {
                 fprintf(stderr,
                         "qemu: memory too small for initial ram disk '%s'\n",
                         loaderparams.initrd_filename);