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From aa5ab4cf6c7335392094577380d2eaee8a0a8d52 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
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Date: Thu, 29 Aug 2019 12:26:34 -0400
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Subject: [PATCH] x86_64: Fix incorrect exclusion by -e option with KASLR
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The -e option uses info->vmemmap_start for creating a table to determine
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the positions of page structures that should be excluded, but it is a
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hardcoded value even with KASLR-enabled vmcore. As a result, the option
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excludes incorrect pages from it.
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To fix this, get the vmemmap start address from info->mem_map_data.
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Signed-off-by: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
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---
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arch/x86_64.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/makedumpfile-1.6.2/arch/x86_64.c b/makedumpfile-1.6.2/arch/x86_64.c
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index 3c0fdc5e72fb..4eeaf4925f43 100644
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--- a/makedumpfile-1.6.2/arch/x86_64.c
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+++ b/makedumpfile-1.6.2/arch/x86_64.c
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@@ -579,6 +579,16 @@ find_vmemmap_x86_64()
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if (NUMBER(sme_mask) != NOT_FOUND_NUMBER)
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pmask &= ~(NUMBER(sme_mask));
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+ /*
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+ * vmemmap region can be randomized by KASLR.
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+ * (currently we don't utilize info->vmemmap_end on x86_64.)
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+ */
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+ if (info->mem_map_data &&
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+ info->mem_map_data[0].mem_map != NOT_MEMMAP_ADDR)
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+ info->vmemmap_start = info->mem_map_data[0].mem_map;
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+
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+ DEBUG_MSG("vmemmap_start: %16lx\n", info->vmemmap_start);
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+
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pagestructsize = size_table.page;
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hugepagesize = PTRS_PER_PMD * info->page_size;
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vaddr_base = info->vmemmap_start;
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--
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2.18.1
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