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  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]
Date:   Tue,  5 May 2020 11:45:05 -0400
From:   Pavel Tatashin <>
Subject: [PATCH v2 0/5] allow ramoops to collect all kmesg_dump events

pstore /mnt/console-ramoops-0 outputs only messages below the console
loglevel, and our console loglevel is set to 3 due to slowness of
serial console. Which means only errors and worse types of messages
are recorded. There is no way to have different log levels for
different consoles.

This patch series adds a new option to ramoops: max_reason that enables
it to collect kmdesg dumps for other reasons beside oops and panics.

How to quickly test:

virtme-run --mods=auto --kdir --mods=auto --kdir . \
	-a memmap=1G$8G -a ramoops.mem_address=0x200000000 \
	-a ramoops.mem_size=0x100000 -a ramoops.record_size=32768 \
	-a ramoops.max_reason=5 -a quiet --qemu-opts -m 8G
# reboot -f

After VM is back:

# mount -t pstore pstore /mnt
# head /mnt/dmesg-ramoops-0 
Restart#1 Part1



Addressed comments from Kees Cook, Steven Rostedt, and Sergey Senozhatsky
 - Replaced dump_all with max_reason
 - removed duplicated enum value
 - moved always_kmsg_dump logic back to kmsg_dump().

Pavel Tatashin (5):
  printk: honor the max_reason field in kmsg_dumper
  pstore/platform: pass max_reason to kmesg dump
  pstore/ram: in ramoops_platform_data convert dump_oops to max_reason
  pstore/ram: allow to dump kmesg during regular reboot
  ramoops: add max_reason optional field to ramoops DT node

 Documentation/admin-guide/ramoops.rst         | 11 +++---
 .../bindings/reserved-memory/ramoops.txt      | 10 ++++--
 drivers/platform/chrome/chromeos_pstore.c     |  2 +-
 fs/pstore/platform.c                          |  4 ++-
 fs/pstore/ram.c                               | 35 +++++++++----------
 include/linux/kmsg_dump.h                     |  1 +
 include/linux/pstore.h                        |  3 ++
 include/linux/pstore_ram.h                    |  2 +-
 kernel/printk/printk.c                        | 15 +++++---
 9 files changed, 51 insertions(+), 32 deletions(-)


Powered by blists - more mailing lists