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From 590f35e773dcd51a750b9a181863660a25b66f01 Mon Sep 17 00:00:00 2001
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From: Petr Tesarik <ptesarik@suse.com>
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Date: Fri, 19 Jan 2018 20:46:19 +0900
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Subject: [PATCH 1/2] [PATCH 1/2] Fix off-by-one errors in exclude_segment()
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The crashed reserved memory end offset is the last address within
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range, whereas the end offset in the pt_loads[] denotes the first
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address past the range. This has caused a number of off-by-one
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errors in exclude_segment().
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First, let's unify the meaning of "end" to be the first out-of-range
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address, i.e. start + size. Thanks to that, no +1 or -1 adjustments
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are needed in exclude_segment().
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Second, since the value read from /proc/iomem is the last address
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within range, add one when passing it as an argument to
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exclude_segment(). This is now the only adjustment by one.
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Signed-off-by: Petr Tesarik <ptesarik@suse.com>
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Tested-by: Bhupesh Sharma <bhsharma@redhat.com>
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---
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elf_info.c | 18 +++++++++---------
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1 file changed, 9 insertions(+), 9 deletions(-)
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diff --git a/makedumpfile-1.6.2/elf_info.c b/makedumpfile-1.6.2/elf_info.c
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index 69b1719b020f..1eaddd968826 100644
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--- a/makedumpfile-1.6.2/elf_info.c
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+++ b/makedumpfile-1.6.2/elf_info.c
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@@ -820,26 +820,26 @@ static int exclude_segment(struct pt_load_segment **pt_loads,
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if (kvstart < vend && kvend > vstart) {
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if (kvstart != vstart && kvend != vend) {
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/* Split load segment */
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- temp_seg.phys_start = end + 1;
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+ temp_seg.phys_start = end;
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temp_seg.phys_end = (*pt_loads)[i].phys_end;
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- temp_seg.virt_start = kvend + 1;
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+ temp_seg.virt_start = kvend;
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temp_seg.virt_end = vend;
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temp_seg.file_offset = (*pt_loads)[i].file_offset
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+ temp_seg.virt_start - (*pt_loads)[i].virt_start;
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temp_seg.file_size = temp_seg.phys_end
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- temp_seg.phys_start;
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- (*pt_loads)[i].virt_end = kvstart - 1;
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- (*pt_loads)[i].phys_end = start - 1;
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+ (*pt_loads)[i].virt_end = kvstart;
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+ (*pt_loads)[i].phys_end = start;
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(*pt_loads)[i].file_size -= temp_seg.file_size;
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tidx = i+1;
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} else if (kvstart != vstart) {
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- (*pt_loads)[i].phys_end = start - 1;
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- (*pt_loads)[i].virt_end = kvstart - 1;
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+ (*pt_loads)[i].phys_end = start;
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+ (*pt_loads)[i].virt_end = kvstart;
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} else {
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- (*pt_loads)[i].phys_start = end + 1;
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- (*pt_loads)[i].virt_start = kvend + 1;
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+ (*pt_loads)[i].phys_start = end;
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+ (*pt_loads)[i].virt_start = kvend;
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}
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(*pt_loads)[i].file_size -= (end -start);
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}
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@@ -917,7 +917,7 @@ int get_kcore_dump_loads(void)
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for (i = 0; i < crash_reserved_mem_nr; i++) {
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exclude_segment(&pt_loads, &num_pt_loads,
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- crash_reserved_mem[i].start, crash_reserved_mem[i].end);
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+ crash_reserved_mem[i].start, crash_reserved_mem[i].end + 1);
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}
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max_file_offset = 0;
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--
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2.7.4
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