[Crash-utility] [RFC PATCH 0/9] Add feature to validate page descriptor table in kdump-compressed format

I've made a RFC patch set to make sanity check of page descriptor table in kdump compressed format strict. This work has arose from the past issue that a produced crash dump file was broken not only in data segment but also in headers including page descriptor table. I've ever explained a bit this on crash-devel in the following thread: https://listman.redhat.com/archives/crash-utility/2023-September/010957.html In this past issue, I couldn't find out its root cause after all because when I began investigating the issue, problematic system where the issue was reproduced was already unavailable. This patch set is aimed at allowing us to figure out this kind of issue more quickly and in more detail using crash utility. The code is based on the tool I made to analyze the broken crash dump in the past issue. This is still incomplete, for example, the sanity check has not yet supported split dump files in the kdump-compressed format and old header version up to 5. It would be appreciated if I can get comments for this RFC version. HATAYAMA Daisuke (9): diskdump: Add stat object in diskdump_data diskdump: Add function sanity_check_page_desc() that sanity checks an entry of page descriptor table diskdump: Add function check_kdump_headers() that validates page descriptor table defs.h: Introduce flag VALIDATE_KDUMP_HEADERS diskdump, main: Add --validate_kdump_headers command-line option diskdump: Make sanity check in cache_page() strict help: Add description of --validate_kdump_headers command-line option man: Add description of --validate_kdump_headers command-line option diskdump, debug: Print elapsed time consumed in validation of page descriptor table crash.8 | 4 +++ defs.h | 1 + diskdump.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++- help.c | 4 +++ main.c | 5 ++++ 5 files changed, 87 insertions(+), 1 deletion(-) -- 2.43.1