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From 59b1726fbcc251155140c8a1972384498fee4daf Mon Sep 17 00:00:00 2001
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From: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
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Date: Tue, 25 Jan 2022 12:55:15 +0000
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Subject: [PATCH] [PATCH] sadump, kaslr: fix failure of calculating
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kaslr_offset
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On kernels v5.8 or later, makedumpfile fails for memory dumps in the
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sadump-related formats as follows:
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# makedumpfile -f -l -d 31 -x ./vmlinux /dev/sdd4 /root/vmcore-ld31
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__vtop4_x86_64: Can't get a valid pud_pte.
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...110 lines of the same message...
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__vtop4_x86_64: Can't get a valid pud_pte.
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calc_kaslr_offset: failed to calculate kaslr_offset and phys_base; default to 0
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readmem: type_addr: 1, addr:ffffffff85411858, size:8
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__vtop4_x86_64: Can't get pgd (page_dir:ffffffff85411858).
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readmem: Can't convert a virtual address(ffffffff059be980) to physical address.
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readmem: type_addr: 0, addr:ffffffff059be980, size:1024
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cpu_online_mask_init: Can't read cpu_online_mask memory.
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makedumpfile Failed.
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This is caused by the kernel commit 9d06c4027f21 ("x86/entry: Convert
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Divide Error to IDTENTRY") that renamed divide_error to
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asm_exc_divide_error, breaking logic for calculating kaslr offset.
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Fix this by adding initialization of asm_exc_divide_error.
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Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
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---
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makedumpfile.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/makedumpfile-1.7.0/makedumpfile.c b/makedumpfile-1.7.0/makedumpfile.c
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index a51bdaf..7ed9756 100644
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--- a/makedumpfile-1.7.0/makedumpfile.c
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+++ b/makedumpfile-1.7.0/makedumpfile.c
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@@ -1667,6 +1667,8 @@ get_symbol_info(void)
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SYMBOL_INIT(cur_cpu_spec, "cur_cpu_spec");
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SYMBOL_INIT(divide_error, "divide_error");
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+ if (SYMBOL(divide_error) == NOT_FOUND_SYMBOL)
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+ SYMBOL_INIT(divide_error, "asm_exc_divide_error");
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SYMBOL_INIT(idt_table, "idt_table");
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SYMBOL_INIT(saved_command_line, "saved_command_line");
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SYMBOL_INIT(pti_init, "pti_init");
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--
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2.33.1
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