From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Potapenko <glider@google.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andreas Larsson <andreas@gaisler.com>,
Ard Biesheuvel <ardb@kernel.org>, Borislav Petkov <bp@alien8.de>,
Brendan Jackman <jackmanb@google.com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Christian Brauner <brauner@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@kernel.org>,
Dmitry Vyukov <dvyukov@google.com>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Ingo Molnar <mingo@redhat.com>, Jan Kara <jack@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
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Marco Elver <elver@google.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Michal Hocko <mhocko@suse.com>, Mike Rapoport <rppt@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>, Rob Herring <robh@kernel.org>,
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Suren Baghdasaryan <surenb@google.com>,
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Subject: [PATCH v2 0/9] memblock: improve late freeing of reserved memory
Date: Mon, 23 Mar 2026 09:48:27 +0200 [thread overview]
Message-ID: <20260323074836.3653702-1-rppt@kernel.org> (raw)
From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
Hi,
Following a recent discussion about leaks in x86 EFI [1], I audited usage of
memblock_free_late() and free_reserved_area() and made some imporovements how
we handle late freeing of the memory allocated with memblock.
[1] https://lore.kernel.org/all/ec2aaef14783869b3be6e3c253b2dcbf67dbc12a.camel@kernel.crashing.org/
v2 changes:
* fix UAF issue in memblock_discard() reported by 0day and sashiko
* address relevant sashiko comments
* squash memblock test stubs changes into the commit with core updates
v1: https://lore.kernel.org/all/20260318105827.1358927-1-rppt@kernel.org
Mike Rapoport (Microsoft) (9):
memblock: reserve_mem: fix end caclulation in reserve_mem_release_by_name()
powerpc: fadump: pair alloc_pages_exact() with free_pages_exact()
powerpc: opal-core: pair alloc_pages_exact() with free_pages_exact()
mm: move free_reserved_area() to mm/memblock.c
memblock: make free_reserved_area() more robust
memblock: extract page freeing from free_reserved_area() into a helper
memblock: make free_reserved_area() update memblock if ARCH_KEEP_MEMBLOCK=y
memblock, treewide: make memblock_free() handle late freeing
memblock: warn when freeing reserved memory before memory map is initialized
arch/arm64/mm/init.c | 3 -
arch/powerpc/kernel/fadump.c | 16 +--
arch/powerpc/platforms/powernv/opal-core.c | 11 +-
arch/sparc/kernel/mdesc.c | 4 +-
arch/x86/kernel/setup.c | 2 +-
arch/x86/platform/efi/memmap.c | 5 +-
arch/x86/platform/efi/quirks.c | 2 +-
drivers/firmware/efi/apple-properties.c | 2 +-
drivers/of/kexec.c | 2 +-
include/linux/memblock.h | 2 -
init/initramfs.c | 7 --
kernel/dma/swiotlb.c | 6 +-
lib/bootconfig.c | 2 +-
mm/internal.h | 10 ++
mm/kfence/core.c | 4 +-
mm/memblock.c | 124 +++++++++++++++------
mm/page_alloc.c | 46 --------
tools/include/linux/mm.h | 1 +
tools/testing/memblock/internal.h | 34 +++++-
19 files changed, 144 insertions(+), 139 deletions(-)
base-commit: 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681
--
2.53.0
next reply other threads:[~2026-03-23 7:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 7:48 Mike Rapoport [this message]
2026-03-23 7:48 ` [PATCH v2 1/9] memblock: reserve_mem: fix end caclulation in reserve_mem_release_by_name() Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 2/9] powerpc: fadump: pair alloc_pages_exact() with free_pages_exact() Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 3/9] powerpc: opal-core: " Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 4/9] mm: move free_reserved_area() to mm/memblock.c Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 5/9] memblock: make free_reserved_area() more robust Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 6/9] memblock: extract page freeing from free_reserved_area() into a helper Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 7/9] memblock: make free_reserved_area() update memblock if ARCH_KEEP_MEMBLOCK=y Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 8/9] memblock, treewide: make memblock_free() handle late freeing Mike Rapoport
2026-03-23 7:48 ` [PATCH v2 9/9] memblock: warn when freeing reserved memory before memory map is initialized Mike Rapoport
2026-03-25 8:51 ` [PATCH v2 0/9] memblock: improve late freeing of reserved memory Mike Rapoport
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