Daniel Thompson 281d356a03 lockdown: also lock down previous kgdb use ... commit eadb2f47a3 upstream. KGDB and KDB allow read and write access to kernel memory, and thus should be restricted during lockdown. An attacker with access to a serial port (for example, via a hypervisor console, which some cloud vendors provide over the network) could trigger the debugger so it is important that the debugger respect the lockdown mode when/if it is triggered. Fix this by integrating lockdown into kdb's existing permissions mechanism. Unfortunately kgdb does not have any permissions mechanism (although it certainly could be added later) so, for now, kgdb is simply and brutally disabled by immediately exiting the gdb stub without taking any action. For lockdowns established early in the boot (e.g. the normal case) then this should be fine but on systems where kgdb has set breakpoints before the lockdown is enacted than "bad things" will happen. CVE: CVE-2022-21499 Co-developed-by: Stephen Brennan <stephen.s.brennan@oracle.com> Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-05-25 09:59:10 +02:00
..
apparmor	lsm: security_task_getsecid_subj() -> security_current_getsecid_subj()	2021-11-22 17:52:47 -05:00
bpf
integrity	EVM: fix the evm= __setup handler return value	2022-04-08 13:57:35 +02:00
keys	KEYS: trusted: Avoid calling null function trusted_key_exit	2022-04-08 13:57:37 +02:00
landlock	landlock: Use square brackets around "landlock-ruleset"	2022-04-08 13:57:26 +02:00
loadpin
lockdown
safesetid
selinux	selinux: fix bad cleanup on error in hashtab_duplicate()	2022-05-25 09:59:02 +02:00
smack	Fix incorrect type in assignment of ipv6 port for audit	2022-04-08 13:58:37 +02:00
tomoyo	TOMOYO: fix __setup handlers return values	2022-04-08 13:58:12 +02:00
yama
commoncap.c	fs: support mapped mounts of mapped filesystems	2021-12-05 10:28:57 +01:00
device_cgroup.c	add missing bpf-cgroup.h includes	2021-12-16 14:57:09 -08:00
inode.c
Kconfig	Merge branch 'akpm' (patches from Andrew)	2021-11-06 14:08:17 -07:00
Kconfig.hardening	gcc-plugins: Explicitly document purpose and deprecation schedule	2021-10-21 08:41:38 -07:00
lsm_audit.c	lsm_audit: avoid overloading the "key" audit field	2021-09-19 22:47:04 -04:00
Makefile	security: remove unneeded subdir-$(CONFIG_...)	2021-09-03 08:17:20 +09:00
min_addr.c
security.c	lockdown: also lock down previous kgdb use	2022-05-25 09:59:10 +02:00