linux-kernel - [PATCH v3] soc: qcom: mdt_loader: Add Upperbounds check for program header access

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240208123527.19725-1-quic_audityab@quicinc.com>
Date: Thu,  8 Feb 2024 18:05:27 +0530
From: Auditya Bhattaram <quic_audityab@...cinc.com>
To: andersson@...nel.org, konrad.dybcio@...aro.org
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Auditya Bhattaram <quic_audityab@...cinc.com>
Subject: [PATCH v3] soc: qcom: mdt_loader: Add Upperbounds check for program header access

hash_index is evaluated by looping phdrs till QCOM_MDT_TYPE_HASH
is found. Add an upperbound check to phdrs to access within elf size.

Fixes: 64fb5eb87d58 ("soc: qcom: mdt_loader: Allow hash to reside in any segment")
Cc: <stable@...r.kernel.org>
Signed-off-by: Auditya Bhattaram <quic_audityab@...cinc.com>
---
Changes in v3:
 - Corrected wrong patch versioning in the Subject.
 - Added error prints for Invalid access.
Link to v2 https://lore.kernel.org/linux-arm-msm/9773d189-c896-d5c5-804c-e086c24987b4@quicinc.com/T/#t
Link to v1 https://lore.kernel.org/linux-arm-msm/5d7a3b97-d840-4863-91a0-32c1d8e7532f@linaro.org/T/#t
---
 drivers/soc/qcom/mdt_loader.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 6f177e46fa0f..61e2377cc5c3 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -145,6 +145,11 @@ void *qcom_mdt_read_metadata(const struct firmware *fw, size_t *data_len,
 	if (phdrs[0].p_type == PT_LOAD)
 		return ERR_PTR(-EINVAL);

+	if (((size_t)(phdrs + ehdr->e_phnum)) > ((size_t)ehdr + fw->size)) {
+		dev_err(dev, "Invalid phdrs access: %s\n", fw_name);
+		return ERR_PTR(-EINVAL);
+	}
+
 	for (i = 1; i < ehdr->e_phnum; i++) {
 		if ((phdrs[i].p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) {
 			hash_segment = i;
--
2.17.1