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Files

Pratyush Yadav (Google) 3a0b8fa2eb kho: fix size calculation in kho_preserved_memory_reserve()

kho_preserved_memory_reserve() calculates the size of a preservation by
doing 1 << (order + PAGE_SHIFT). Since the '1' is a 32-bit integer, it
can only be shifted by 31. That is, it will only work for preservations
up to 2 GiB. Larger preservations will trigger undefined behaviour.

While preservations larger than 2 GiB can't be obtained via folios
currently, they can be obtained via kho_preserve_pages().

For example, memblock reserve_mem uses kho_preserve_pages().
Reservations larger than 2 GiB are valid and will trigger this bug if
properly aligned.

Fix it by using 1UL for shifting.

Fixes: fc33e4b44b ("kexec: enable KHO support for memory preservation")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Link: https://patch.msgid.link/20260727150240.889555-1-pratyush@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

2026-07-29 09:11:15 +03:00

Kconfig

kho: make preserved pages compatible with deferred struct page init

2026-06-01 02:31:37 +03:00

kexec_handover_debug.c

liveupdate: kho: move to kernel/liveupdate

2025-11-27 14:24:33 -08:00

kexec_handover_debugfs.c

kho: fix kho_in_debugfs_init() to handle non-FDT blobs

2026-04-18 00:10:48 -07:00

kexec_handover_internal.h

kho: rename fdt parameter to blob in kho_add/remove_subtree()