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From 38d921a2ef50ebd36258097553626443ffe27496 Mon Sep 17 00:00:00 2001
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From: Coiby Xu <coxu@redhat.com>
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Date: Tue, 15 Jun 2021 18:26:31 +0800
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Subject: [PATCH] check for invalid physical address of /proc/kcore
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when finding max_paddr
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Kernel commit 464920104bf7adac12722035bfefb3d772eb04d8 ("/proc/kcore:
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update physical address for kcore ram and text") sets an invalid paddr
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(0xffffffffffffffff = -1) for PT_LOAD segments of not direct mapped
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regions:
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$ readelf -l /proc/kcore
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...
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Program Headers:
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Type Offset VirtAddr PhysAddr
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FileSiz MemSiz Flags Align
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NOTE 0x0000000000000120 0x0000000000000000 0x0000000000000000
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0x0000000000002320 0x0000000000000000 0x0
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LOAD 0x1000000000010000 0xd000000000000000 0xffffffffffffffff
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^^^^^^^^^^^^^^^^^^
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0x0001f80000000000 0x0001f80000000000 RWE 0x10000
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makedumpfile uses max_paddr to calculate the number of sections for
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sparse memory model thus wrong number is obtained based on max_paddr
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(-1). This error could lead to the failure of copying /proc/kcore
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for RHEL-8.5 on ppc64le machine [1]:
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$ makedumpfile /proc/kcore vmcore1
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get_mem_section: Could not validate mem_section.
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get_mm_sparsemem: Can't get the address of mem_section.
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makedumpfile Failed.
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Let's check if the phys_start of the segment is a valid physical
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address to fix this problem.
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[1] https://bugzilla.redhat.com/show_bug.cgi?id=1965267
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Reported-by: Xiaoying Yan <yiyan@redhat.com>
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Signed-off-by: Coiby Xu <coxu@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-1.6.8/elf_info.c b/makedumpfile-1.6.8/elf_info.c
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index e8affb7..bc24083 100644
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--- a/makedumpfile-1.6.8/elf_info.c
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+++ b/makedumpfile-1.6.8/elf_info.c
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@@ -628,7 +628,7 @@ get_max_paddr(void)
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for (i = 0; i < num_pt_loads; i++) {
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pls = &pt_loads[i];
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- if (max_paddr < pls->phys_end)
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+ if (pls->phys_start != NOT_PADDR && max_paddr < pls->phys_end)
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max_paddr = pls->phys_end;
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}
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return max_paddr;
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--
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2.29.2
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