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optee-os: Fix CVE-2026-33662

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Pick patch from [1] as mentioned in OP-TEE os security report in [2].

[1] https://github.com/OP-TEE/optee_os/commit/caeaa2ae551666068894005387cca4113b10873f
[2] https://github.com/OP-TEE/optee_os/security/advisories/GHSA-4cf8-v5g3-73gr

Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com>
Reviewed-by: Bruno VERNAY <bruno.vernay@se.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>
This commit is contained in:
Hugo SIMELIERE
2026-05-21 11:46:26 +02:00
committed by Jon Mason
parent 313a5da55a
commit c4fd56386e
2 changed files with 41 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta-arm/recipes-security/optee/optee-os/CVE-2026-33662.patch
+40
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@@ -0,0 +1,40 @@
From 2fdf0aa10bd23c0e4633efa087a27ff07f79015f Mon Sep 17 00:00:00 2001
From: Jens Wiklander <jens.wiklander@linaro.org>
Date: Thu, 22 Jan 2026 14:19:36 +0100
Subject: [PATCH] core: crypto_api: fix underflow in emsa_pkcs1_v1_5_encode()
Guard against an integer underflow in emsa_pkcs1_v1_5_encode() that can
occur when calculating the padding field in the EMA-PKCS1-v1_5 encoding.
CVE: CVE-2026-33662
Upstream-Status: Backport [https://github.com/OP-TEE/optee_os/commit/caeaa2ae551666068894005387cca4113b10873f]
Fixes: f5a70e3efb80 ("drivers: crypto: generic resources for crypto device driver - RSA")
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@arm.com>
Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com>
---
core/drivers/crypto/crypto_api/acipher/rsassa.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/core/drivers/crypto/crypto_api/acipher/rsassa.c b/core/drivers/crypto/crypto_api/acipher/rsassa.c
index 0f71b84cc..01f8d7dc9 100644
--- a/core/drivers/crypto/crypto_api/acipher/rsassa.c
+++ b/core/drivers/crypto/crypto_api/acipher/rsassa.c
@@ -45,9 +45,10 @@ static TEE_Result emsa_pkcs1_v1_5_encode(struct drvcrypt_rsa_ssa *ssa_data,
* Calculate the PS size
* EM Size (modulus size) - 3 bytes - DigestInfo DER format size
*/
- ps_size = ssa_data->key.n_size - 3;
- ps_size -= ssa_data->digest_size;
- ps_size -= 10 + hash_oid->asn1_length;
+ if (SUB_OVERFLOW(ssa_data->key.n_size, 3, &ps_size) ||
+ SUB_OVERFLOW(ps_size, ssa_data->digest_size, &ps_size) ||
+ SUB_OVERFLOW(ps_size, 10 + hash_oid->asn1_length, &ps_size))
+ return TEE_ERROR_BAD_PARAMETERS;
CRYPTO_TRACE("PS size = %zu (n %zu)", ps_size, ssa_data->key.n_size);
--
2.43.0
meta-arm/recipes-security/optee/optee-os_4.1.0.bb
+1
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@@ -10,4 +10,5 @@ SRC_URI += " \
file://CVE-2026-33317-1.patch \
file://CVE-2026-33317-2.patch \
file://CVE-2026-33317-3.patch \
file://CVE-2026-33662.patch \
"