Information about certain limits set in the system

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Information about certain limits set in the system

May 21, 2024

ID system_limits

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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.
`Terminal`	The constants in the `sysroot-*-kos/include/kl/Terminal.idl(.h)` files: `MaxTerminalBytesCount` `(kl_Terminal_MaxTerminalBytesCount)` – maximum terminal read/write buffer size in bytes. `MaxTerminalConnectionIdSize` `(kl_Terminal_MaxTerminalConnectionIdSize)` – maximum terminal identifier size in bytes.

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