linux-kernel - [PATCH v3 0/2] binfmt_elf, coredump: Log the reason of the failed core dumps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240718182743.1959160-1-romank@linux.microsoft.com>
Date: Thu, 18 Jul 2024 11:27:23 -0700
From: Roman Kisel <romank@...ux.microsoft.com>
To: akpm@...ux-foundation.org,
	apais@...ux.microsoft.com,
	ardb@...nel.org,
	bigeasy@...utronix.de,
	brauner@...nel.org,
	ebiederm@...ssion.com,
	jack@...e.cz,
	keescook@...omium.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	nagvijay@...rosoft.com,
	oleg@...hat.com,
	tandersen@...flix.com,
	vincent.whitchurch@...s.com,
	viro@...iv.linux.org.uk
Cc: apais@...rosoft.com,
	benhill@...rosoft.com,
	ssengar@...rosoft.com,
	sunilmut@...rosoft.com,
	vdso@...bites.dev
Subject: [PATCH v3 0/2] binfmt_elf, coredump: Log the reason of the failed core dumps

A powerful way to diagnose crashes is to analyze the core dump produced upon
the failure. Missing or malformed core dump files hinder these investigations.
I'd like to propose changes that add logging as to why the kernel would not
finish writing out the core dump file.

To help in diagnosing the user mode helper not writing out the entire coredump
contents, the changes also log short statistics on the dump collection. I'd
advocate for keeping this at the info level on these grounds.

For validation, I built the kernel and a simple user space to exercize the new
code.

[V3]
  - Standartized the existing logging to report TGID and comm consistently
  - Fixed compiler warnings for the 32-bit systems (used %zd in the format strings)

[V2]
  https://lore.kernel.org/all/20240712215223.605363-1-romank@linux.microsoft.com/
  - Used _ratelimited to avoid spamming the system log
  - Added comm and PID to the log messages
  - Added logging to the failure paths in dump_interrupted, dump_skip, and dump_emit
  - Fixed compiler warnings produced when CONFIG_COREDUMP is disabled

[V1]
  https://lore.kernel.org/all/20240617234133.1167523-1-romank@linux.microsoft.com/

Roman Kisel (2):
  coredump: Standartize and fix logging
  binfmt_elf, coredump: Log the reason of the failed core dumps

 fs/binfmt_elf.c          |  48 +++++++++----
 fs/coredump.c            | 150 +++++++++++++++++++++++++++------------
 include/linux/coredump.h |  30 +++++++-
 kernel/signal.c          |  21 +++++-
 4 files changed, 188 insertions(+), 61 deletions(-)


base-commit: 831bcbcead6668ebf20b64fdb27518f1362ace3a
-- 
2.45.2