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Fri, 01 May 2026 10:31:30 -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 2/5] liveupdate: validate LUO FDT physical address before mapping Date: Sat, 2 May 2026 01:30:50 +0800 Message-ID: <20260501173053.73116-3-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 LUO gets the restored FDT address from KHO and maps it with phys_to_virt(). Check the FDT size and make sure the address range is KHO-preserved before mapping it. Reject empty or oversized FDT metadata. Signed-off-by: Cris Jacob Maamor --- kernel/liveupdate/luo_core.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/kernel/liveupdate/luo_core.c b/kernel/liveupdate/luo_core.c index 803f51c84275..633a16434164 100644 --- a/kernel/liveupdate/luo_core.c +++ b/kernel/liveupdate/luo_core.c @@ -82,6 +82,7 @@ early_param("liveupdate", early_liveupdate_param); static int __init luo_early_startup(void) { + size_t fdt_size; phys_addr_t fdt_phys; int err, ln_size; const void *ptr; @@ -94,7 +95,8 @@ static int __init luo_early_startup(void) } /* Retrieve LUO subtree, and verify its format. */ - err = kho_retrieve_subtree(LUO_FDT_KHO_ENTRY_NAME, &fdt_phys, NULL); + err = kho_retrieve_subtree(LUO_FDT_KHO_ENTRY_NAME, &fdt_phys, + &fdt_size); if (err) { if (err != -ENOENT) { pr_err("failed to retrieve FDT '%s' from KHO: %pe\n", @@ -105,6 +107,12 @@ static int __init luo_early_startup(void) return 0; } + if (!fdt_size || fdt_size > LUO_FDT_SIZE || + !kho_is_preserved(fdt_phys, DIV_ROUND_UP(fdt_size, PAGE_SIZE))) { + pr_err("Invalid LUO FDT from KHO\n"); + return -EINVAL; + } + luo_global.fdt_in = phys_to_virt(fdt_phys); err = fdt_node_check_compatible(luo_global.fdt_in, 0, LUO_FDT_COMPATIBLE); -- 2.53.0