linux-kernel - [PATCH V3 09/20] nvdimm/namespace_label: Skip region label during ns label DPA reservation

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: <20250917134116.1623730-10-s.neeraj@samsung.com>
Date: Wed, 17 Sep 2025 19:11:05 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, gost.dev@...sung.com
Cc: a.manzanares@...sung.com, vishak.g@...sung.com, neeraj.kernel@...il.com,
	cpgs@...sung.com, Neeraj Kumar <s.neeraj@...sung.com>
Subject: [PATCH V3 09/20] nvdimm/namespace_label: Skip region label during
 ns label DPA reservation

If Namespace label is present in LSA during nvdimm_probe() then DPA
reservation is required. But this reservation is not required by region
label. Therefore if LSA scanning finds any region label, skip it.

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/nvdimm/label.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 5e476154cf81..935a0df5b47e 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -441,6 +441,7 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
 		return 0; /* no label, nothing to reserve */
 
 	for_each_clear_bit_le(slot, free, nslot) {
+		union nd_lsa_label *lsa_label;
 		struct nd_namespace_label *nd_label;
 		struct nd_region *nd_region = NULL;
 		struct nd_label_id label_id;
@@ -448,9 +449,14 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
 		uuid_t label_uuid;
 		u32 flags;
 
-		nd_label = to_label(ndd, slot);
+		lsa_label = (union nd_lsa_label *) to_label(ndd, slot);
+		nd_label = &lsa_label->ns_label;
 
-		if (!slot_valid(ndd, (union nd_lsa_label *) nd_label, slot))
+		/* Skip region label. DPA reservation is for NS label only */
+		if (is_region_label(ndd, lsa_label))
+			continue;
+
+		if (!slot_valid(ndd, lsa_label, slot))
 			continue;
 
 		nsl_get_uuid(ndd, nd_label, &label_uuid);
-- 
2.34.1