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Files from Mark Seaborn

Email addressmrs at mythic-beasts.com
First Active2005-01-05
Last Active2015-03-10
NaCl Sandbox Escape For Rowhammer
Posted Mar 10, 2015
Authored by Mark Seaborn

This is a proof-of-concept exploit that is able to escape from Native Client's x86-64 sandbox on machines that are susceptible to the DRAM "rowhammer" problem. It works by inducing a bit flip in read-only code so that the code is no longer safe, producing instruction sequences that wouldn't pass NaCl's x86-64 validator. Note that this uses the CLFLUSH instruction, so it doesn't work in newer versions of NaCl where this instruction is disallowed by the validator.

tags | exploit, x86
systems | linux
MD5 | a775e7efeb523745c95d154aff727703
Rowhammer Linux Kernel Privilege Escalation
Posted Mar 9, 2015
Authored by Mark Seaborn

This is a proof-of-concept exploit that is able to gain kernel privileges on machines that are susceptible to the DRAM "rowhammer" problem. It runs as an unprivileged userland process on x86-64 Linux. It works by inducing bit flips in page table entries (PTEs).

tags | exploit, x86, kernel
systems | linux
MD5 | d7fe41707769b3dece28e753e47286cc
plash_1.19.orig.tar.gz
Posted May 6, 2008
Authored by Mark Seaborn | Site plash.beasts.org

Plash is a sandbox for running GNU/Linux programs with minimum privileges. It is suitable for running both command line and GUI programs. It can dynamically grant Gtk-based GUI applications access rights to individual files that you want to open or edit. This happens transparently through the Open/Save file chooser dialog box, by replacing GtkFileChooserDialog. Plash virtualizes the file namespace and provides per-process/per-sandbox namespaces. It can grant processes read-only or read-write access to specific files and directories, mapped at any point in the filesystem namespace. It does not require modifications to the Linux kernel.

Changes: Various updates and fixes.
tags | tool, kernel
systems | linux, unix
MD5 | c44d14f2ed27e248cbfd5d148c844c23
plash_1.18.orig.tar.gz
Posted Jun 11, 2007
Authored by Mark Seaborn | Site plash.beasts.org

Plash is a sandbox for running GNU/Linux programs with minimum privileges. It is suitable for running both command line and GUI programs. It can dynamically grant Gtk-based GUI applications access rights to individual files that you want to open or edit. This happens transparently through the Open/Save file chooser dialog box, by replacing GtkFileChooserDialog. Plash virtualizes the file namespace and provides per-process/per-sandbox namespaces. It can grant processes read-only or read-write access to specific files and directories, mapped at any point in the filesystem namespace. It does not require modifications to the Linux kernel.

Changes: Various updates and fixes.
tags | tool, kernel
systems | linux, unix
MD5 | eaaade57552c35f72471ecab9c6e7bd1
plash_1.17.orig.tar.gz
Posted Dec 29, 2006
Authored by Mark Seaborn | Site plash.beasts.org

Plash is a sandbox for running GNU/Linux programs with minimum privileges. It is suitable for running both command line and GUI programs. It can dynamically grant Gtk-based GUI applications access rights to individual files that you want to open or edit. This happens transparently through the Open/Save file chooser dialog box, by replacing GtkFileChooserDialog. Plash virtualizes the file namespace and provides per-process/per-sandbox namespaces. It can grant processes read-only or read-write access to specific files and directories, mapped at any point in the filesystem namespace. It does not require modifications to the Linux kernel.

Changes: Various updates and fixes.
tags | tool, kernel
systems | linux, unix
MD5 | abad752e8af24a8c71042f5823680f3d
plash-1.16.tar.gz
Posted Mar 28, 2006
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: Documentation updates. Various enhancements and fixes.
tags | tool, shell, kernel
systems | linux, unix
MD5 | 7f1749c04ba62dbae31f6d0437bb1dea
plash-1.15.tar.gz
Posted Dec 28, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: Various enhancements and fixes.
tags | tool, shell, kernel
systems | linux, unix
MD5 | f5b7fe95fbebc5dfb6063eab4e074b63
plash-1.14.tar.gz
Posted Nov 10, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: Multiple bug fixes.
tags | tool, shell, kernel
systems | linux, unix
MD5 | c7d3a0b107a3168dcf00f3941ea4bdd4
plash-1.13.tar.gz
Posted Oct 7, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: Big changes to the build process and some bug fixes.
tags | tool, shell, kernel
systems | linux, unix
MD5 | 6d9ed5835d868b76cf155b1ba5b64a5d
plash-1.12.tar.gz
Posted Sep 22, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: Various tweaks and improvements.
tags | tool, shell, kernel
systems | linux, unix
MD5 | 29cb185a4efd12fde911a603ee6d290e
plash-1.11.tar.gz
Posted Aug 17, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: The major new feature in this version is the plash-run-emacs program.
tags | tool, shell, kernel
systems | linux, unix
MD5 | bcb730e87b8f6596c693ddb17a1854f3
plash-1.10.tar.gz
Posted Jul 21, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

Changes: Implemented the use of fchdir().
tags | tool, shell, kernel
systems | linux, unix
MD5 | 1cc92ce04b1acd6f7fdd60212ca25032
plash-1.9.tar.gz
Posted Jul 12, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

tags | tool, shell, kernel
systems | linux, unix
MD5 | 3fdcb943fcaa6f27229750a1c8567f01
plash-1.8.tar.gz
Posted Jun 1, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

tags | tool, shell, kernel
systems | linux, unix
MD5 | 1416819f04be0e4509100ca220d8608a
plash-1.6.tar.gz
Posted Jan 19, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

tags | tool, shell, kernel
systems | linux, unix
MD5 | 860fda64f6cd95c7472fcb4c0a1cc6e6
plash-1.4.tar.gz
Posted Jan 5, 2005
Authored by Mark Seaborn | Site cs.jhu.edu

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run. In order to implement this, the filesystem is virtualized. Each process can have its own namespace, which can contain a subset of your files. Plash is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run in a chroot jail under dynamically-allocated user IDs. No kernel modifications are required. Existing Linux binaries work unchanged.

tags | tool, shell, kernel
systems | linux, unix
MD5 | e7887736fadee25d07d6c959af492e88
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