kexec-tools/kexec-tools-2.0.23-makedumpfile-sadump-kaslr-fix-failure-of-calculating-kaslr_.patch
Tao Liu 6e2f52ede1 makedumpfile: sadump, kaslr: fix failure of calculating kaslr_offset
upstream: fedora
resolves: bz2055498
conflict: none

commit 59b1726fbcc251155140c8a1972384498fee4daf
Author: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
Date:   Tue Jan 25 12:55:15 2022 +0000

    [PATCH] sadump, kaslr: fix failure of calculating kaslr_offset

    On kernels v5.8 or later, makedumpfile fails for memory dumps in the
    sadump-related formats as follows:

        # makedumpfile -f -l -d 31 -x ./vmlinux /dev/sdd4 /root/vmcore-ld31
        __vtop4_x86_64: Can't get a valid pud_pte.
        ...110 lines of the same message...
        __vtop4_x86_64: Can't get a valid pud_pte.
        calc_kaslr_offset: failed to calculate kaslr_offset and phys_base; default to 0
        readmem: type_addr: 1, addr:ffffffff85411858, size:8
        __vtop4_x86_64: Can't get pgd (page_dir:ffffffff85411858).
        readmem: Can't convert a virtual address(ffffffff059be980) to physical address.
        readmem: type_addr: 0, addr:ffffffff059be980, size:1024
        cpu_online_mask_init: Can't read cpu_online_mask memory.

        makedumpfile Failed.

    This is caused by the kernel commit 9d06c4027f21 ("x86/entry: Convert
    Divide Error to IDTENTRY") that renamed divide_error to
    asm_exc_divide_error, breaking logic for calculating kaslr offset.

    Fix this by adding initialization of asm_exc_divide_error.

    Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>

Signed-off-by: Tao Liu <ltao@redhat.com>
2022-02-25 09:53:51 +08:00

50 lines
1.9 KiB
Diff

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