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From 4c53423b995463067fbbd394e724b4d1d6ea3d62 Mon Sep 17 00:00:00 2001
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Message-Id: <4c53423b995463067fbbd394e724b4d1d6ea3d62.1489471500.git.panand@redhat.com>
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In-Reply-To: <4b0bed3523a5f6c2c428d9dab3d27d4572207d52.1489471500.git.panand@redhat.com>
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References: <4b0bed3523a5f6c2c428d9dab3d27d4572207d52.1489471500.git.panand@redhat.com>
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From: Baoquan He <bhe@redhat.com>
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Date: Thu, 2 Mar 2017 17:37:19 +0900
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Subject: [PATCH 5/7] [PATCH v3 5/7] makedumpfile: Correct the calculation of
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kvaddr in set_kcore_vmcoreinfo
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In set_kcore_vmcoreinfo, we calculate the virtual address of vmcoreinfo
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by OR operation as below:
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kvaddr = (ulong)vmcoreinfo_addr | PAGE_OFFSET;
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When mm sections kaslr is not enabled, this is correct since the
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starting address of direct mapping section is 0xffff880000000000 which
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is 1T aligned. Usually system with memory below 1T won't cause problem.
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However with mm section kaslr enabled, the starting address of direct
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mapping is 1G aligned. The above code makes kvaddr unsure.
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So change it to adding operation:
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kvaddr = (ulong)vmcoreinfo_addr + PAGE_OFFSET;
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Signed-off-by: Baoquan He <bhe@redhat.com>
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---
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elf_info.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/makedumpfile-1.6.1/elf_info.c b/makedumpfile-1.6.1/elf_info.c
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index c5743b3cab28..100272f83c48 100644
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--- a/makedumpfile-1.6.1/elf_info.c
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+++ b/makedumpfile-1.6.1/elf_info.c
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@@ -372,7 +372,7 @@ int set_kcore_vmcoreinfo(uint64_t vmcoreinfo_addr, uint64_t vmcoreinfo_len)
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off_t offset_desc;
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offset = UNINITIALIZED;
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- kvaddr = (ulong)vmcoreinfo_addr | PAGE_OFFSET;
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+ kvaddr = (ulong)vmcoreinfo_addr + PAGE_OFFSET;
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for (i = 0; i < num_pt_loads; ++i) {
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struct pt_load_segment *p = &pt_loads[i];
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--
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2.9.3
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