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Fri, 01 May 2026 02:49:34 -0700 (PDT) Received: from laptop ([2001:4455:8025:be00:eebe:247e:613c:24d7]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8351582dd55sm2042729b3a.1.2026.05.01.02.49.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260501_024935_545055_4C808CFD X-CRM114-Status: GOOD ( 11.10 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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