[PATCH kexec-tools 18/32] arm: report if crash kernel is out of bounds

[Russell King]

Report an error if the crash kernel memory region is outside of the
boot-view memory range - this can happen with systems such as
Keystone 2.

Signed-off-by: Russell King <rmk at arm.linux.org.uk>
---
 kexec/arch/arm/crashdump-arm.c | 11 +++++++++++
 kexec/arch/arm/crashdump-arm.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/kexec/arch/arm/crashdump-arm.c b/kexec/arch/arm/crashdump-arm.c
index fcc4d42..739c906 100644
--- a/kexec/arch/arm/crashdump-arm.c
+++ b/kexec/arch/arm/crashdump-arm.c
@@ -365,6 +365,17 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
 	if (get_kernel_page_offset(info, &elf_info))
 		return -1;
 
+	/*
+	 * Ensure that the crash kernel memory range is sane. The crash kernel
+	 * must be located within memory which is visible during booting.
+	 */
+	if (crash_reserved_mem.end > ARM_MAX_VIRTUAL) {
+		fprintf(stderr,
+			"Crash kernel memory [0x%llx-0x%llx] is inaccessible at boot - unable to load crash kernel\n",
+			crash_reserved_mem.start, crash_reserved_mem.end);
+		return -1;
+	}
+
 	last_ranges = usablemem_rgns.size - 1;
 	if (last_ranges < 0)
 		last_ranges = 0;
diff --git a/kexec/arch/arm/crashdump-arm.h b/kexec/arch/arm/crashdump-arm.h
index 2dbde04..7314960 100644
--- a/kexec/arch/arm/crashdump-arm.h
+++ b/kexec/arch/arm/crashdump-arm.h
@@ -9,6 +9,7 @@ extern "C" {
 #define DEFAULT_PAGE_OFFSET		(0xc0000000)
 #define KVBASE_MASK	(0x1ffffff)
 #define CRASH_MAX_MEMORY_RANGES	32
+#define ARM_MAX_VIRTUAL		UINT32_MAX
 
 
 extern struct memory_ranges usablemem_rgns;
-- 
1.9.1