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

From: Petr Tesarik <petrtesarik@huaweicloud.com>
To: Jonathan Corbet <corbet@lwn.net>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	"H. Peter Anvin" <hpa@zytor.com>,
	Andy Lutomirski <luto@kernel.org>,
	Oleg Nesterov <oleg@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>, Xin Li <xin3.li@intel.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Kees Cook <keescook@chromium.org>,
	"Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
	Pengfei Xu <pengfei.xu@intel.com>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Ze Gao <zegao2021@gmail.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Kai Huang <kai.huang@intel.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	Brian Gerst <brgerst@gmail.com>, Jason Gunthorpe <jgg@ziepe.ca>,
	Joerg Roedel <jroedel@suse.de>,
	"Mike Rapoport (IBM)" <rppt@kernel.org>,
	Tina Zhang <tina.zhang@intel.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	linux-doc@vger.kernel.org (open list:DOCUMENTATION),
	linux-kernel@vger.kernel.org (open list)
Cc: Roberto Sassu <roberto.sassu@huaweicloud.com>,
	petr@tesarici.cz,
	Petr Tesarik <petr.tesarik1@huawei-partners.com>
Subject: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks
Date: Wed, 14 Feb 2024 12:35:08 +0100	[thread overview]
Message-ID: <20240214113516.2307-1-petrtesarik@huaweicloud.com> (raw)

From: Petr Tesarik <petr.tesarik1@huawei-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