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From 6e4b2dfaed5e5e5c617e0e45f969c1f571c13e27 Mon Sep 17 00:00:00 2001
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From: Jialong Chen <chenjialong@huawei.com>
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Date: Mon, 23 Mar 2020 16:42:01 -0400
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Subject: [PATCH 7/7] [PATCH] Fix cd_header offset overflow with large pfn
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In function write_kdump_pages_and_bitmap_cyclic(), cd_header->offset is
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calculated by the following formula:
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cd_header->offset
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= (DISKDUMP_HEADER_BLOCKS + dh->sub_hdr_size + dh->bitmap_blocks)
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* dh->block_size;
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However, the variables of the right side are only int and unsigned int,
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so if dh->bitmap_blocks is very large, it causes an interger overflow.
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As a result, makedumpfile created a broken vmcore in a system with a
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physical address range from 0x602770ecf000 to 0x6027ffffffff, and the
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crash utility failed during session initialization, ending with the
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error message "crash: vmlinux and vmcore do not match!".
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Signed-off-by: Jialong Chen <chenjialong@huawei.com>
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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diskdump_mod.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/makedumpfile-1.6.7/diskdump_mod.h b/makedumpfile-1.6.7/diskdump_mod.h
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index 2676817..3733953 100644
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--- a/makedumpfile-1.6.7/diskdump_mod.h
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+++ b/makedumpfile-1.6.7/diskdump_mod.h
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@@ -22,7 +22,7 @@
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#define DISK_DUMP_SIGNATURE "DISKDUMP"
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#define KDUMP_SIGNATURE "KDUMP "
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#define SIG_LEN (sizeof(DUMP_PARTITION_SIGNATURE) - 1)
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-#define DISKDUMP_HEADER_BLOCKS (1)
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+#define DISKDUMP_HEADER_BLOCKS (1UL)
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/*
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* These are all remnants of the old "diskdump" facility,
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--
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2.7.5
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