From 1303a27c9c32020a3b6ac89be270d2ab1f28be24 Mon Sep 17 00:00:00 2001 From: Baoquan He Date: Wed, 9 Sep 2015 15:39:03 -0700 Subject: [PATCH] kexec: export KERNEL_IMAGE_SIZE to vmcoreinfo In x86_64, since v2.6.26 the KERNEL_IMAGE_SIZE is changed to 512M, and accordingly the MODULES_VADDR is changed to 0xffffffffa0000000. However, in v3.12 Kees Cook introduced kaslr to randomise the location of kernel. And the kernel text mapping addr space is enlarged from 512M to 1G. That means now KERNEL_IMAGE_SIZE is variable, its value is 512M when kaslr support is not compiled in and 1G when kaslr support is compiled in. Accordingly the MODULES_VADDR is changed too to be: #define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE) So when kaslr is compiled in and enabled, the kernel text mapping addr space and modules vaddr space need be adjusted. Otherwise makedumpfile will collapse since the addr for some symbols is not correct. Hence KERNEL_IMAGE_SIZE need be exported to vmcoreinfo and got in makedumpfile to help calculate MODULES_VADDR. Signed-off-by: Baoquan He Acked-by: Kees Cook Acked-by: Vivek Goyal Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/kexec_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 322dd5579f59..201b45327804 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -1417,6 +1417,9 @@ static int __init crash_save_vmcoreinfo_init(void) #endif VMCOREINFO_NUMBER(PG_head_mask); VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); +#ifdef CONFIG_X86 + VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE); +#endif #ifdef CONFIG_HUGETLBFS VMCOREINFO_SYMBOL(free_huge_page); #endif -- 2.20.1