Information about certain limits set in the system

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Appendices > Information about certain limits set in the system

Information about certain limits set in the system

Header files and IDL files from the KasperskyOS SDK contain constants that set limits in the system (see table below).

Constants that set limits in the system

Subsystem	Constants
`POSIX`	The constants in the `sysroot-*-kos/include/limits.h` file.
`BlobContainer`	The constants in the `sysroot-*-kos/include/kl/EntityLauncher.idl(.h)` files: `MaxArgSize` `(kl_EntityLauncher_MaxArgSize)` – maximum program launch parameter and environment variable size in bytes. `MaxArgsCount` `(kl_EntityLauncher_MaxArgsCount)` – maximum number of launch parameters and environment variables for a program.
`CertificateStorage`	The constants in the `sysroot-*-kos/include/kl/CertificateStorage.idl(.h)` files: `MaxNumCerts` `(kl_CertificateStorage_MaxNumCerts)` – maximum number of certificates in a storage. `MaxCertSize` `(kl_CertificateStorage_MaxCertSize)` – maximum certificate size in bytes. `HashSize` `(kl_CertificateStorage_HashSize)` – size of the certificate storage hash, in bytes.
`Tls`	The constants in the `sysroot--kos/include/kl/CertificatePolicy.idl(.h)` files: `MaxDERCertDataSize` `(kl_CertificatePolicy_MaxDERCertDataSize)` – maximum DER certificate size in bytes. `MaxHostAddressBufferSize` `(kl_CertificatePolicy_MaxHostAddressBufferSize)` – maximum host address buffer size in bytes. The constants in the `sysroot--kos/include/kl/crypto/tls/TlsEvent.idl(.h)` files: `FunctionNameSize` `(kl_crypto_tls_TlsEvent_FunctionNameSize)` – maximum function name size in bytes. `IdSize` `(kl_crypto_tls_TlsEvent_IdSize)` – session identifier size in bytes. `HostnameSize` `(kl_crypto_tls_TlsEvent_HostnameSize)` – maximum host name size in bytes. `PkiEntrySize` `(kl_crypto_tls_TlsEvent_PkiEntrySize)` – maximum PKI certificate size in bytes. `MaxCertificatesInChain` `(kl_crypto_tls_TlsEvent_MaxCertificatesInChain)` – maximum number of certificates in a chain. `MaxCertificatesInTrustedSet` `(kl_crypto_tls_TlsEvent_MaxCertificatesInTrustedSet)` – maximum number of trusted certificates. `KeyFingerprintLength` `(kl_crypto_tls_TlsEvent_KeyFingerprintLength)` – key fingerprint size in bytes. `MbedTlsDescriptionSize` `(kl_crypto_tls_TlsEvent_MbedTlsDescriptionSize)` – maximum MbedTLS error description size in bytes. `VfsDescriptionSize` `(kl_crypto_tls_TlsEvent_VfsDescriptionSize)` – maximum VFS error description size in bytes. `DescriptionSize` `(kl_crypto_tls_TlsEvent_DescriptionSize)` – maximum event description size in bytes.
`ExecutionManager`	The constants in the `sysroot-*-kos/include/kl/execution_manager/Types.idl(.h)` files: `NkAppNameMaxSize` `(kl_execution_manager_Types_NkAppNameMaxSize)` – maximum program name size in bytes. `NkPathMaxSize` `(kl_execution_manager_Types_NkPathMaxSize)` – maximum executable file path size in bytes. `NkEntityNameMaxSize` `(kl_execution_manager_Types_NkEntityNameMaxSize)` – maximum process name size in bytes. `NkEiidMaxSize` `(kl_execution_manager_Types_NkEiidMaxSize)` – maximum process class name size in bytes. `NkTaskNameMaxSize` `(kl_execution_manager_Types_NkTaskNameMaxSize)` – maximum process name size in bytes. `NkArgMaxLen` `(kl_execution_manager_Types_NkArgMaxLen)` – maximum program launch parameter size in bytes. `NkEnvMaxLen` `(kl_execution_manager_Types_NkEnvMaxLen)` – maximum environment variable size in bytes. `NkArgsArrayMaxSize` `(kl_execution_manager_Types_NkArgsArrayMaxSize)` – maximum number of program launch parameters. `NkEnvsArrayMaxSize` `(kl_execution_manager_Types_NkEnvsArrayMaxSize)` – maximum number of environment variables for a program.
`KlogStorage`	The constants in the `sysroot-*-kos/include/kl/KlogStorage.idl(.h)` files: `StringSize` `(kl_KlogStorage_StringSize)` – maximum message size in bytes. `MaxMessages` `(kl_KlogStorage_MaxMessages)` – maximum number of messages.
`Env`	The constants in the `sysroot-*-kos/include/kl/Env.idl(.h)` files: `MaxArgsCount` `(kl_Env_MaxArgsCount)` – maximum number of launch parameters and environment variables for a program. `MaxArgSize` `(kl_Env_MaxArgSize)` – maximum program launch parameter and environment variable size in bytes. `MaxNameSize` `(kl_Env_MaxNameSize)` – maximum process name size in bytes.
`VFS`	The constants in the `sysroot-*-kos/include/kl/VfsTypes.idl(.h)` files: `MaxBytesCount` `(kl_VfsTypes_MaxBytesCount)` – maximum `VFS` data transmission buffer size in bytes. `MaxPathSize` `(kl_VfsTypes_MaxPathSize)` – maximum path size in bytes. `MaxDevnameSize` `(kl_VfsTypes_MaxDevnameSize)` – maximum device name size in bytes. `MaxFstypeSize` `(kl_VfsTypes_MaxFstypeSize)` – maximum file system name size in bytes. `MaxFsDataSize` `(kl_VfsTypes_MaxFsDataSize)` – maximum data size for the `data` parameter of the `mount()` function, in bytes. `MaxFcntlTSize` `(kl_VfsTypes_MaxFcntlTSize)` – maximum data size for an optional parameter of the `fcntl()` function, in bytes. `MaxIoctlTSize` `(kl_VfsTypes_MaxIoctlTSize)` – maximum data size for an optional parameter of the `ioctl()` function, in bytes. `MaxSockAddrSize` `(kl_VfsTypes_MaxSockAddrSize)` – maximum IP address size in bytes. `MaxSockOptionSize` `(kl_VfsTypes_MaxSockOptionSize)` – maximum data size for the `option_value` parameter of the `getsockopt()` and `setsockopt()` functions, in bytes. `MaxHostnameSize` `(kl_VfsTypes_MaxHostnameSize)` – maximum host name size in bytes. `MaxServnameSize` `(kl_VfsTypes_MaxServnameSize)` – maximum data size for the `servname` parameter of the `getaddrinfo()` function and the `service` parameter of the `getnameinfo()` function, in bytes. `MaxMsgNameSize` `(kl_VfsTypes_MaxMsgNameSize)` – maximum data size for the `msg_name` element of the `message` parameter of the `recvmsg()` and `sendmsg()` functions, in bytes. `MaxMsgDataSize` `(kl_VfsTypes_MaxMsgDataSize)` – maximum data size for a `msg_control` element of the `message` parameter of the `recvmsg()` and `sendmsg()` functions, in bytes. `MaxIovDataSize` `(kl_VfsTypes_MaxIovDataSize)` – maximum number of the buffer described by the `iovec` structure in the `message` parameter of the `recvmsg()` and `sendmsg()` functions, and in the `iov` parameter of the `readv()` and `writev()` functions, in bytes. `MaxIovecsCount` `(kl_VfsTypes_MaxIovecsCount)` – maximum number of `iovec` structures in the `message` parameter of the `recvmsg()` and `sendmsg()` functions, and in the `iov` parameter of the `readv()` and `writev()` functions. `MaxAddrinfoSize` `(kl_VfsTypes_MaxAddrinfoSize)` – maximum data size for the `res` parameter of the `getaddrinfo()` function, in bytes. `VfsHostent` `(kl_VfsTypes_MaxHostentSize)` – maximum data size for a return value of the `gethostbyname()` function, in bytes. `VfsDnsName` `(kl_VfsTypes_MaxDnsNameSize)` – maximum data size for the `name` parameter of the `getnetbyname()` function, in bytes. `MaxProtoentNameSize` `(kl_VfsTypes_MaxProtoentNameSize)` – maximum protocol name size in the `name` parameter of the `getprotobyname()` function, and in the return value of the `getprotobyname()` and `getprotobynumber()` functions, in bytes. `MaxProtoentAliasesSize` `(kl_VfsTypes_MaxProtoentAliasesSize)` – maximum protocol alias size in the return values of the `getprotobyname()` and `getprotobynumber()` functions, in bytes.
`MessageBus`	The constants in the `sysroot-*-kos/include/kl/MessageBusTypes.idl(.h)` files: `MaxStringLength` `(kl_MessageBusTypes_MaxStringLength)` – maximum message size in bytes.
`Dhcpcd`	The constants in the `sysroot-*-kos/include/kl/rump/DhcpcdConfig.idl(.h)` files: `MaxDhcpcdStrSize` `(kl_rump_DhcpcdConfig_MaxDhcpcdStrSize)` – maximum size of a parameter set received from a DHCP server, in bytes.

Article ID: system_limits, Last review: Feb 20, 2025

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