kdump, vmcoreinfo: report memory sections virtual addresses

KASLR memory randomization can randomize the base of the physical memory
mapping (PAGE_OFFSET), vmalloc (VMALLOC_START) and vmemmap
(VMEMMAP_START).  Adding these variables on VMCOREINFO so tools can easily
identify the base of each memory section.

Link: http://lkml.kernel.org/r/1471531632-23003-1-git-send-email-thgarnie@google.com
Signed-off-by: Thomas Garnier <thgarnie@google.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Xunlei Pang <xlpang@redhat.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Eugene Surovegin <surovegin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index fc3389fc47a2f3dfacc7bff0665f1d6c4b75a245..b1f15a2dab65cc299fd5fb134ef429080e78a55e 100644 (file)
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -338,6 +338,9 @@ void arch_crash_save_vmcoreinfo(void)
        vmcoreinfo_append_str("KERNELOFFSET=%lx\n",
                              kaslr_offset());
        VMCOREINFO_PHYS_BASE(phys_base);
+       VMCOREINFO_PAGE_OFFSET(PAGE_OFFSET);
+       VMCOREINFO_VMALLOC_START(VMALLOC_START);
+       VMCOREINFO_VMEMMAP_START(VMEMMAP_START);
 }
 
 /* arch-dependent functionality related to kexec file-based syscall */

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index d3ae4292931b790415b449d0fad19c017823f4ca..cd3874c21b3cfd849c239db5e719e7e9b3aeec4e 100644 (file)
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -261,6 +261,12 @@ phys_addr_t paddr_vmcoreinfo_note(void);
        vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
 #define VMCOREINFO_PHYS_BASE(value) \
        vmcoreinfo_append_str("PHYS_BASE=%lx\n", (unsigned long)value)
+#define VMCOREINFO_PAGE_OFFSET(value) \
+       vmcoreinfo_append_str("PAGE_OFFSET=%lx\n", (unsigned long)value)
+#define VMCOREINFO_VMALLOC_START(value) \
+       vmcoreinfo_append_str("VMALLOC_START=%lx\n", (unsigned long)value)
+#define VMCOREINFO_VMEMMAP_START(value) \
+       vmcoreinfo_append_str("VMEMMAP_START=%lx\n", (unsigned long)value)
 
 extern struct kimage *kexec_image;
 extern struct kimage *kexec_crash_image;