Function set_binary_attr

CVE-2022-34918/exploit/exploit.c:446–452

set_binary_attr(): Prepare a byte array netlink attribute @buffer: Buffer with data to send @buffer_size: Size of the previous buffer

// @buffer: Buffer with data to send
// @buffer_size: Size of the previous buffer
struct nlattr *set_binary_attr(struct nlattr *attr, uint16_t type, uint8_t *buffer, uint64_t buffer_size) {
    attr->nla_type = type;
    attr->nla_len = NLA_BIN_SIZE(buffer_size);
    memcpy(NLA_ATTR(attr), buffer, buffer_size);

    return (void *)attr + NLA_ALIGN(NLA_BIN_SIZE(buffer_size));
}

// ---------------------------------- nf_tables --------------------------------------
#define KMALLOC64_KEYLEN (64 - 8 - 12 - 16) // Max size - elemsize - sizeof(nft_set_ext)(align) - min datasize