Virtuozzo International Gmbh

Stanislav Kinsburskiy

Alexey Kobets

Eugene Kolomeetz

A system and method is provided for switching file systems based on an instruction from a user application. An exemplary method includes receiving an instruction from a user application to replace a first file system by a second file system, identifying and temporarily suspending all processes that are working with one or more files on the first file system, obtaining information about all files that are used by a temporarily suspended process, the obtained information including at least information on corresponding memory mappings or file descriptors, replacing resources of the first file system by matching resources of the second file system, synchronizing attributes of the first and second file systems, and resuming execution of suspended processes.

System and method for switching file systems based on an instruction from a user application

A system and method for executing a method generating a binary patch file for live patching of an application is disclosed. In one exemplary aspect, the method comprises creating shared object by compiling source code patch file that contains source code of a new function corresponding to an old function, a global external symbol referenced in the source code of the new function, and at least one link to a symbol in an application binary code corresponding to the global external symbol, wherein the shared object contains binary code of the new function for replacing the old function during the live patching, and the result of a compilation of the link, generating metadata usable to facilitate the live patching, creating bindings between calculated relative addresses and the global external symbol referenced by the shared object, and creating the binary patch file by adding metadata to the shared object.

System and method for generating a binary patch file for live patching of an application

A system and method is provided for switching file systems underneath working processes. An exemplary method includes identifying a process running on an operating system of a computing device that is using a file on a first file system and temporarily suspending execution of the process. Moreover, the method includes identifying existing references of the process to access the file on the first file system during execution of the process and replacing the existing reference of the process with a new reference for the process to access a second file on a second file system during execution of the process. Moreover, the second file on the second file system corresponds to the first file on the first file system. Finally, the method includes resuming execution of the process on the computing device.

System and method for switching file systems underneath working processes

A system and method for live patching a process in userspace is disclosed. In one exemplary aspect, a system for live patching comprises a process executing in userspace in an operating system executed by a hardware processor and a patcher configured to: suspend execution of the process, wherein a memory address space of the process contains binary code executed in the process, and wherein the binary code comprises one or more symbols, map a binary patch to the memory address space of the process, wherein the binary patch contains amendments to the binary code, wherein the binary patch references a portion of the one or more symbols, and wherein the binary patch contains metadata indicating offsets of the portion of the one or more symbols, resolve the portion of the one or more symbols using the offsets in the metadata and resume execution of the process.

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Moscow, Russia

Stanislav Kinsburskiy