The patch titled
Subject: kdump, vmcoreinfo: report memory sections virtual addresses
has been added to the -mm tree. Its filename is
kdump-vmcoreinfo-report-memory-sections-virtual-addresses.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kdump-vmcoreinfo-report-memory-sections-virtual-addresses.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kdump-vmcoreinfo-report-memory-sections-virtual-addresses.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Thomas Garnier <thgarnie@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H . Peter Anvin" <hpa@xxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Xunlei Pang <xlpang@xxxxxxxxxx>
Cc: HATAYAMA Daisuke <d.hatayama@xxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Eugene Surovegin <surovegin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/machine_kexec_64.c | 3 +++
include/linux/kexec.h | 6 ++++++
2 files changed, 9 insertions(+)
diff -puN arch/x86/kernel/machine_kexec_64.c~kdump-vmcoreinfo-report-memory-sections-virtual-addresses arch/x86/kernel/machine_kexec_64.c
--- a/arch/x86/kernel/machine_kexec_64.c~kdump-vmcoreinfo-report-memory-sections-virtual-addresses
+++ a/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 -puN include/linux/kexec.h~kdump-vmcoreinfo-report-memory-sections-virtual-addresses include/linux/kexec.h
--- a/include/linux/kexec.h~kdump-vmcoreinfo-report-memory-sections-virtual-addresses
+++ a/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;
_
Patches currently in -mm which might be from thgarnie@xxxxxxxxxx are
kdump-vmcoreinfo-report-memory-sections-virtual-addresses.patch
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