linux-kernel - [PATCH v2 03/32] kho: warn if KHO is disabled due to an error

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20250723144649.1696299-4-pasha.tatashin@soleen.com>
Date: Wed, 23 Jul 2025 14:46:16 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: pratyush@...nel.org,
	jasonmiu@...gle.com,
	graf@...zon.com,
	changyuanl@...gle.com,
	pasha.tatashin@...een.com,
	rppt@...nel.org,
	dmatlack@...gle.com,
	rientjes@...gle.com,
	corbet@....net,
	rdunlap@...radead.org,
	ilpo.jarvinen@...ux.intel.com,
	kanie@...ux.alibaba.com,
	ojeda@...nel.org,
	aliceryhl@...gle.com,
	masahiroy@...nel.org,
	akpm@...ux-foundation.org,
	tj@...nel.org,
	yoann.congal@...le.fr,
	mmaurer@...gle.com,
	roman.gushchin@...ux.dev,
	chenridong@...wei.com,
	axboe@...nel.dk,
	mark.rutland@....com,
	jannh@...gle.com,
	vincent.guittot@...aro.org,
	hannes@...xchg.org,
	dan.j.williams@...el.com,
	david@...hat.com,
	joel.granados@...nel.org,
	rostedt@...dmis.org,
	anna.schumaker@...cle.com,
	song@...nel.org,
	zhangguopeng@...inos.cn,
	linux@...ssschuh.net,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-mm@...ck.org,
	gregkh@...uxfoundation.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	rafael@...nel.org,
	dakr@...nel.org,
	bartosz.golaszewski@...aro.org,
	cw00.choi@...sung.com,
	myungjoo.ham@...sung.com,
	yesanishhere@...il.com,
	Jonathan.Cameron@...wei.com,
	quic_zijuhu@...cinc.com,
	aleksander.lobakin@...el.com,
	ira.weiny@...el.com,
	andriy.shevchenko@...ux.intel.com,
	leon@...nel.org,
	lukas@...ner.de,
	bhelgaas@...gle.com,
	wagi@...nel.org,
	djeffery@...hat.com,
	stuart.w.hayes@...il.com,
	ptyadav@...zon.de,
	lennart@...ttering.net,
	brauner@...nel.org,
	linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	saeedm@...dia.com,
	ajayachandra@...dia.com,
	jgg@...dia.com,
	parav@...dia.com,
	leonro@...dia.com,
	witu@...dia.com
Subject: [PATCH v2 03/32] kho: warn if KHO is disabled due to an error

During boot scratch area is allocated based on command line
parameters or auto calculated. However, scratch area may fail
to allocate, and in that case KHO is disabled. Currently,
no warning is printed that KHO is disabled, which makes it
confusing for the end user to figure out why KHO is not
available. Add the missing warning message.

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 kernel/kexec_handover.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/kexec_handover.c b/kernel/kexec_handover.c
index 1ff6b242f98c..368e23db0a17 100644
--- a/kernel/kexec_handover.c
+++ b/kernel/kexec_handover.c
@@ -565,6 +565,7 @@ static void __init kho_reserve_scratch(void)
 err_free_scratch_desc:
 	memblock_free(kho_scratch, kho_scratch_cnt * sizeof(*kho_scratch));
 err_disable_kho:
+	pr_warn("Failed to reserve scratch area, disabling kexec handover\n");
 	kho_enable = false;
 }
 
-- 
2.50.0.727.gbf7dc18ff4-goog