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> Acked-by: Baoquan He <bhe@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 @@ -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 */ 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 @@ -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; _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
