ARM: 6748/1: ignore mdesc->boot_params if out of range

The initial MMU table created in head.S contains a 1 MB mapping at the
start of memory to let the early kernel boot code access the boot params
specified by mdesc->boot_params.

When using CONFIG_ARM_PATCH_PHYS_VIRT it is possible for the kernel to
have a different idea of where the start of memory is at run time, making
the compile-time determined mdesc->boot_params pointing to a memory area
which is not mapped.  Any access to the boot params in that case will
fault and silently hang the kernel at that point.  It is therefore a
better idea to simply ignore mdesc->boot_params in that case and give
the kernel a chance to print some diagnostic on the console later.

If the bootloader provides a valid pointer in r2 to the kernel then this
is used instead of mdesc->boot_params, and an explicit mapping is already
created in the initial MMU table for it.  It is therefore a good idea to
use that facility when using a relocated kernel.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 19 insertions, 2 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 6ce80106316e..f43f041a0977 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -839,8 +839,25 @@ void __init setup_arch(char **cmdline_p)
 
         if (__atags_pointer)
                 tags = phys_to_virt(__atags_pointer);
-        else if (mdesc->boot_params)
-                tags = phys_to_virt(mdesc->boot_params);
+        else if (mdesc->boot_params) {
+#ifdef CONFIG_MMU
+                /*
+                 * We still are executing with a minimal MMU mapping created
+                 * with the presumption that the machine default for this
+                 * is located in the first MB of RAM.  Anything else will
+                 * fault and silently hang the kernel at this point.
+                 */
+                if (mdesc->boot_params < PHYS_OFFSET ||
+                    mdesc->boot_params >= PHYS_OFFSET + SZ_1M) {
+                        printk(KERN_WARNING
+                               "Default boot params at physical 0x%08lx out of reach\n",
+                               mdesc->boot_params);
+                } else
+#endif
+                {
+                        tags = phys_to_virt(mdesc->boot_params);
+                }
+        }
 
 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
         /*