linux-kernel - [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

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Date: Wed, 14 Feb 2024 12:35:08 +0100
From: Petr Tesarik <petrtesarik@...weicloud.com>
To: Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Xin Li <xin3.li@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Kees Cook <keescook@...omium.org>,
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
	Pengfei Xu <pengfei.xu@...el.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Ze Gao <zegao2021@...il.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Kai Huang <kai.huang@...el.com>,
	David Woodhouse <dwmw@...zon.co.uk>,
	Brian Gerst <brgerst@...il.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Joerg Roedel <jroedel@...e.de>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Tina Zhang <tina.zhang@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	linux-doc@...r.kernel.org (open list:DOCUMENTATION),
	linux-kernel@...r.kernel.org (open list)
Cc: Roberto Sassu <roberto.sassu@...weicloud.com>,
	petr@...arici.cz,
	Petr Tesarik <petr.tesarik1@...wei-partners.com>
Subject: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

From: Petr Tesarik <petr.tesarik1@...wei-partners.com>

This patch series implements x86_64 arch hooks for the generic SandBox
Mode infrastructure.

SandBox Mode on x86_64 is implemented as follows:

* The target function runs with CPL 3 (same as user mode) within its
  own virtual address space.
* Interrupt entry/exit paths are modified to let the interrupt handlers
  always run with kernel CR3 and restore sandbox CR3 when returning to
  sandbox mode.
* To avoid undesirable user mode processing (FPU state, signals, etc.),
  the value of pt_regs->cs is temporarily adjusted to make it look like
  coming from kernel mode.
* On a CPU fault, execution stops immediately, returning -EFAULT to
  the caller.

Petr Tesarik (8):
  sbm: x86: page table arch hooks
  sbm: x86: execute target function on sandbox mode stack
  sbm: x86: map system data structures into the sandbox
  sbm: x86: allocate and map an exception stack
  sbm: x86: handle sandbox mode faults
  sbm: x86: switch to sandbox mode pages in arch_sbm_exec()
  sbm: documentation of the x86-64 SandBox Mode implementation
  sbm: x86: lazy TLB flushing

 Documentation/security/sandbox-mode.rst |  25 ++
 arch/x86/Kconfig                        |   1 +
 arch/x86/entry/entry_64.S               | 123 ++++++
 arch/x86/include/asm/page_64_types.h    |   1 +
 arch/x86/include/asm/ptrace.h           |  21 +
 arch/x86/include/asm/sbm.h              |  83 ++++
 arch/x86/include/asm/segment.h          |   7 +
 arch/x86/include/asm/thread_info.h      |   3 +
 arch/x86/kernel/Makefile                |   2 +
 arch/x86/kernel/asm-offsets.c           |  10 +
 arch/x86/kernel/sbm/Makefile            |  16 +
 arch/x86/kernel/sbm/call_64.S           |  95 +++++
 arch/x86/kernel/sbm/core.c              | 499 ++++++++++++++++++++++++
 arch/x86/kernel/traps.c                 |  14 +-
 arch/x86/mm/fault.c                     |   6 +
 15 files changed, 905 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/include/asm/sbm.h
 create mode 100644 arch/x86/kernel/sbm/Makefile
 create mode 100644 arch/x86/kernel/sbm/call_64.S
 create mode 100644 arch/x86/kernel/sbm/core.c

-- 
2.34.1