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Fri, 01 May 2026 10:31:38 -0700 (PDT) From: Cris Jacob Maamor To: Mike Rapoport , Pasha Tatashin , Pratyush Yadav Cc: Alexander Graf , Andrew Morton , Greg Kroah-Hartman , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 4/5] liveupdate: validate restored LUO file set metadata Date: Sat, 2 May 2026 01:30:52 +0800 Message-ID: <20260501173053.73116-5-crisjacobmaamor@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260501173053.73116-1-crisjacobmaamor@gmail.com> References: <20260501094637.38650-1-crisjacobmaamor@gmail.com> <20260501173053.73116-1-crisjacobmaamor@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The restored session metadata provides the LUO file set address and count. LUO maps that address with phys_to_virt() and uses the restored count to walk the serialized file array. Reject invalid empty file set metadata, reject counts above LUO_FILE_MAX, and check that the physical range is KHO-preserved before mapping it. Signed-off-by: Cris Jacob Maamor --- kernel/liveupdate/luo_file.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/kernel/liveupdate/luo_file.c b/kernel/liveupdate/luo_file.c index a0a419085e28..cde43d822f8f 100644 --- a/kernel/liveupdate/luo_file.c +++ b/kernel/liveupdate/luo_file.c @@ -783,11 +783,21 @@ int luo_file_deserialize(struct luo_file_set *file_set, struct luo_file_ser *file_ser; u64 i; - if (!file_set_ser->files) { - WARN_ON(file_set_ser->count); + if (!file_set_ser->count) { + if (file_set_ser->files) + return -EINVAL; return 0; } + if (file_set_ser->count > LUO_FILE_MAX) + return -EINVAL; + + if (!file_set_ser->files) + return -EINVAL; + + if (!kho_is_preserved(file_set_ser->files, LUO_FILE_PGCNT)) + return -EINVAL; + file_set->count = file_set_ser->count; file_set->files = phys_to_virt(file_set_ser->files); -- 2.53.0