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cryptodev-builtin: Limit the maximum size

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This backend driver is used for demonstration purposes only, unlimited
size leads QEMU OOM.

Fixes: CVE-2025-14876
Fixes: 1653a5f3fc ("cryptodev: introduce a new cryptodev backend")
Reported-by: 이재영 <nakamurajames123@gmail.com>
Signed-off-by: zhenwei pi <zhenwei.pi@linux.dev>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20251221024321.143196-3-zhenwei.pi@linux.dev>
(cherry picked from commit 7b913094c703641a0442bb1d1165323a019c591c)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
zhenwei pi 2025-12-21 10:43:21 +08:00 • committed by Michael Tokarev
parent 2ac11c1d93
commit 51514aa3c2
1 changed files with 3 additions and 6 deletions
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9
backends/cryptodev-builtin.c
View file

@ -53,6 +53,8 @@ typedef struct CryptoDevBackendBuiltinSession {
#define CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN 512
#define CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN 64
/* demonstration purposes only, use a limited size to avoid QEMU OOM */
#define CRYPTODEV_BUITLIN_MAX_REQUEST_SIZE (1024 * 1024)
struct CryptoDevBackendBuiltin {
CryptoDevBackend parent_obj;
@ -98,12 +100,7 @@ static void cryptodev_builtin_init(
1u << QCRYPTODEV_BACKEND_SERVICE_TYPE_MAC;
backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
/*
* Set the Maximum length of crypto request.
* Why this value? Just avoid to overflow when
* memory allocation for each crypto request.
*/
backend->conf.max_size = LONG_MAX - sizeof(CryptoDevBackendOpInfo);
backend->conf.max_size = CRYPTODEV_BUITLIN_MAX_REQUEST_SIZE;
backend->conf.max_cipher_key_len = CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN;
backend->conf.max_auth_key_len = CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN;
cryptodev_builtin_init_akcipher(backend);