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Fri, 01 May 2026 02:49:34 -0700 (PDT) From: Cris Jacob Maamor To: Mike Rapoport , Pasha Tatashin , Pratyush Yadav Cc: Alexander Graf , Andrew Morton , Dan Carpenter , Greg Kroah-Hartman , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH RFC 2/5] liveupdate: validate restored LUO FDT before use Date: Fri, 1 May 2026 17:46:34 +0800 Message-ID: <20260501094637.38650-3-crisjacobmaamor@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260501094637.38650-1-crisjacobmaamor@gmail.com> References: <20260501094637.38650-1-crisjacobmaamor@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: A3A3A18000A X-Rspam-User: X-Stat-Signature: bqie95sn6stayqxnhcjh5fc8cu9r74x9 X-HE-Tag: 1777628975-36751 X-HE-Meta: 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 JXThvPCp gwEGvw4bAFHoOmYpfAbm+wVnxNYSb4i5QssbVKf5tcPEjWlG+mcHGANlhwrcHneC7AteLte58nL1f96htS7kCeIO784IuNDJBd7C6/I/AbOSgVxSvGokZhGJZdsxhbMLcGeJiq1kiomwPdPzBie+1YPdGAjq/qMx5uM8pk3h5pUjUgLp1gDLYGiW/+6pEWQN8+gQSuYX3V0iIpfUoAuS8kjwCqbQd7i907B06Y1AAX+9YkWA9W9+00j/3BcMgaFGpxcGtZcXPVBxfo7dQMen+cU/q/QVNI3PMiBF6PPTJ0ErgIveH816lWLOLwdS0XlkUs9HFeDgdyqXZb3V34QSvrV62vVocuNhvR2taCNe7xFPmo2McLsECNRVo4SMvt/rU0aRkXbHiEj4V+VUeMCHk49DjvZUsjrrnMERTAXoizmIjHHYO1ue/NFggywvZwLAib5pdJpGT/XpnWjc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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