linux-hardening - [PATCH 0/3] dm-pcache: built-in support and metadata hardening

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Message-ID: <20251105084733.3598704-1-me@linux.beauty>
Date: Wed,  5 Nov 2025 16:46:51 +0800
From: Li Chen <me@...ux.beauty>
To: Kees Cook <kees@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: [PATCH 0/3] dm-pcache: built-in support and metadata hardening

From: Li Chen <chenl311@...natelecom.cn>

This three-patch series tidies dm-pcache’s build glue and tightens the metadata scan.

Patch 1 allow dm-pcache to be linked into vmlinux and avoids clashing with the sunrpc
cache_flush() by using obj-$(CONFIG_DM_PCACHE) and renaming the helper across the tree.

Patch 2 drops a redundant recomputation of the metadata slot pointer while walking headers.

Patch 3 zero-allocates a temporary buffer so callers never see stale metadata,
relies on __free(kvfree) for cleanup, and only copies back once a valid record is found.

Thanks for your review.

Li Chen (3):
  dm-pcache: allow built-in build and rename flush helper
  dm-pcache: reuse meta_addr in pcache_meta_find_latest
  dm-pcache: avoid leaking invalid metadata in pcache_meta_find_latest()

 drivers/md/dm-pcache/Makefile          |  2 +-
 drivers/md/dm-pcache/cache.c           |  2 +-
 drivers/md/dm-pcache/cache.h           |  2 +-
 drivers/md/dm-pcache/cache_req.c       |  6 +++---
 drivers/md/dm-pcache/pcache_internal.h | 15 ++++++++++-----
 5 files changed, 16 insertions(+), 11 deletions(-)

-- 
2.51.0