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kdump, vmcoreinfo: report memory sections virtual addresses

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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/[email protected]
Signed-off-by: Thomas Garnier <[email protected]>
Acked-by: Baoquan He <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H . Peter Anvin" <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: Xunlei Pang <[email protected]>
Cc: HATAYAMA Daisuke <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Eugene Surovegin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Thomas Garnier authored and Linus Torvalds committed 2016-10-11 15:06:33 -07:00
1 parent 2a1613a586
commit 0549a3c02e
2 files changed
+9
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arch/x86/kernel/machine_kexec_64.c
+3
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@@ -337,6 +337,9 @@ void arch_crash_save_vmcoreinfo(void)
#endif
vmcoreinfo_append_str("KERNELOFFSET=%lx\n",
kaslr_offset());
VMCOREINFO_PAGE_OFFSET(PAGE_OFFSET);
VMCOREINFO_VMALLOC_START(VMALLOC_START);
VMCOREINFO_VMEMMAP_START(VMEMMAP_START);
}
/* arch-dependent functionality related to kexec file-based syscall */
include/linux/kexec.h
+6
View File
@@ -259,6 +259,12 @@ phys_addr_t paddr_vmcoreinfo_note(void);
vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
#define VMCOREINFO_CONFIG(name) \
vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
#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;