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--HG-- rename : security/sandbox/LICENSE => security/sandbox/linux/LICENSE rename : security/sandbox/Makefile.in => security/sandbox/linux/Makefile.in rename : security/sandbox/Sandbox.cpp => security/sandbox/linux/Sandbox.cpp rename : security/sandbox/Sandbox.h => security/sandbox/linux/Sandbox.h rename : security/sandbox/android_arm_ucontext.h => security/sandbox/linux/android_arm_ucontext.h rename : security/sandbox/android_i386_ucontext.h => security/sandbox/linux/android_i386_ucontext.h rename : security/sandbox/android_ucontext.h => security/sandbox/linux/android_ucontext.h rename : security/sandbox/arm_linux_syscalls.h => security/sandbox/linux/arm_linux_syscalls.h rename : security/sandbox/linux_seccomp.h => security/sandbox/linux/linux_seccomp.h rename : security/sandbox/linux_syscalls.h => security/sandbox/linux/linux_syscalls.h rename : security/sandbox/moz.build => security/sandbox/linux/moz.build rename : security/sandbox/seccomp_filter.h => security/sandbox/linux/seccomp_filter.h rename : security/sandbox/x86_32_linux_syscalls.h => security/sandbox/linux/x86_32_linux_syscalls.h rename : security/sandbox/x86_64_linux_syscalls.h => security/sandbox/linux/x86_64_linux_syscalls.h
264 lines
10 KiB
C
264 lines
10 KiB
C
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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/* This file has been initially imported from
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* http://git.chromium.org/gitweb/?p=chromium.git;a=blob;f=sandbox/linux/seccomp-bpf/linux_seccomp.h;h=0de0259da39ecdb745e5923b9a6ff3961c13be00;hb=2362c9abea79cae475921bdeee58f9e3910d211c
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*
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* Contains code for macro for common filters from:
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* http://outflux.net/teach-seccomp/step-5/seccomp-bpf.h
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*
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* Contains code for arch_seccomp_data and arch_sigsys from:
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* http://git.chromium.org/gitweb/?p=chromium.git;a=blob;f=sandbox/linux/seccomp-bpf/sandbox_bpf.h;h=3d269916070c97b8be8938503b9b799f12d79ca6;hb=2362c9abea79cae475921bdeee58f9e3910d211c
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*
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* For more information about Seccomp, see also:
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* Documentation/prctl/seccomp_filter.txt and
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* samples/seccomp in the Linux kernel directory, for any kernel >= 3.5.0.
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*/
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#ifndef SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
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#define SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
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struct arch_seccomp_data {
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int nr;
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uint32_t arch;
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uint64_t instruction_pointer;
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uint64_t args[6];
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};
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struct arch_sigsys {
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void *ip;
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int nr;
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unsigned int arch;
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};
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// The Seccomp2 kernel ABI is not part of older versions of glibc.
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// As we can't break compilation with these versions of the library,
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// we explicitly define all missing symbols.
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// If we ever decide that we can now rely on system headers, the following
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// include files should be enabled:
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// #include <linux/audit.h>
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// #include <linux/seccomp.h>
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#include <asm/unistd.h>
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#include <linux/filter.h>
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// From <linux/elf.h> and <linux/audit.h>
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// This is necessary as we can't expect recent audit headers.
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#ifndef EM_ARM
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#define EM_ARM 40
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#endif
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#ifndef EM_386
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#define EM_386 3
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#endif
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#ifndef EM_X86_64
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#define EM_X86_64 62
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#endif
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#ifndef __AUDIT_ARCH_64BIT
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#define __AUDIT_ARCH_64BIT 0x80000000
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#endif
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#ifndef __AUDIT_ARCH_LE
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#define __AUDIT_ARCH_LE 0x40000000
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#endif
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#ifndef AUDIT_ARCH_ARM
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#define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE)
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#endif
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#ifndef AUDIT_ARCH_I386
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#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
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#endif
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#ifndef AUDIT_ARCH_X86_64
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#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
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#endif
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// From <linux/prctl.h>
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// This is necessary as we can't expect recent prctl headers.
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#ifndef PR_SET_SECCOMP
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#define PR_SET_SECCOMP 22
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#define PR_GET_SECCOMP 21
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#endif
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#ifndef PR_SET_NO_NEW_PRIVS
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#define PR_SET_NO_NEW_PRIVS 38
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#define PR_GET_NO_NEW_PRIVS 39
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#endif
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#ifndef IPC_64
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#define IPC_64 0x0100
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#endif
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#ifndef BPF_MOD
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#define BPF_MOD 0x90
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#endif
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#ifndef BPF_XOR
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#define BPF_XOR 0xA0
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#endif
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// From <linux/seccomp.h>
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// This is necessary as we can't expect recent seccomp headers.
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#ifndef SECCOMP_MODE_FILTER
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#define SECCOMP_MODE_DISABLED 0
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#define SECCOMP_MODE_STRICT 1
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#define SECCOMP_MODE_FILTER 2 // User user-supplied filter (seccomp-bpf)
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#endif
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#ifndef SECCOMP_RET_KILL
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// Return values supported for BPF filter programs. Please note that the
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// "illegal" SECCOMP_RET_INVALID is not supported by the kernel, should only
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// ever be used internally, and would result in the kernel killing our process.
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#define SECCOMP_RET_KILL 0x00000000U // Kill the task immediately
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#define SECCOMP_RET_INVALID 0x00010000U // Illegal return value
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#define SECCOMP_RET_TRAP 0x00030000U // Disallow and force a SIGSYS
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#define SECCOMP_RET_ERRNO 0x00050000U // Returns an errno
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#define SECCOMP_RET_TRACE 0x7ff00000U // Pass to a tracer or disallow
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#define SECCOMP_RET_ALLOW 0x7fff0000U // Allow
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#define SECCOMP_RET_ACTION 0xffff0000U // Masks for the return value
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#define SECCOMP_RET_DATA 0x0000ffffU // sections
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#else
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#define SECCOMP_RET_INVALID 0x00010000U // Illegal return value
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#endif
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#ifndef SYS_SECCOMP
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#define SYS_SECCOMP 1
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#endif
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// Impose some reasonable maximum BPF program size. Realistically, the
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// kernel probably has much lower limits. But by limiting to less than
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// 30 bits, we can ease requirements on some of our data types.
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#define SECCOMP_MAX_PROGRAM_SIZE (1<<30)
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#if defined(__i386__)
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#define MIN_SYSCALL 0u
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#define MAX_PUBLIC_SYSCALL 1024u
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#define MAX_SYSCALL MAX_PUBLIC_SYSCALL
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#define SECCOMP_ARCH AUDIT_ARCH_I386
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#define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[(_reg)])
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#define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, REG_EAX)
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#define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, REG_EAX)
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#define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, REG_EIP)
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#define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, REG_EBX)
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#define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, REG_ECX)
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#define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, REG_EDX)
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#define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, REG_ESI)
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#define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, REG_EDI)
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#define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, REG_EBP)
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#define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
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#define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
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#define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
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instruction_pointer) + 4)
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#define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
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instruction_pointer) + 0)
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#define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
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8*(nr) + 4)
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#define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
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8*(nr) + 0)
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#elif defined(__x86_64__)
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#define MIN_SYSCALL 0u
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#define MAX_PUBLIC_SYSCALL 1024u
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#define MAX_SYSCALL MAX_PUBLIC_SYSCALL
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#define SECCOMP_ARCH AUDIT_ARCH_X86_64
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#define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[(_reg)])
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#define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, REG_RAX)
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#define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, REG_RAX)
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#define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, REG_RIP)
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#define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, REG_RDI)
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#define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, REG_RSI)
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#define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, REG_RDX)
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#define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, REG_R10)
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#define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, REG_R8)
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#define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, REG_R9)
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#define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
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#define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
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#define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
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instruction_pointer) + 4)
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#define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
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instruction_pointer) + 0)
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#define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
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8*(nr) + 4)
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#define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
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8*(nr) + 0)
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#elif defined(__arm__) && (defined(__thumb__) || defined(__ARM_EABI__))
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// ARM EABI includes "ARM private" system calls starting at |__ARM_NR_BASE|,
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// and a "ghost syscall private to the kernel", cmpxchg,
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// at |__ARM_NR_BASE+0x00fff0|.
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// See </arch/arm/include/asm/unistd.h> in the Linux kernel.
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#define MIN_SYSCALL ((unsigned int)__NR_SYSCALL_BASE)
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#define MAX_PUBLIC_SYSCALL (MIN_SYSCALL + 1024u)
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#define MIN_PRIVATE_SYSCALL ((unsigned int)__ARM_NR_BASE)
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#define MAX_PRIVATE_SYSCALL (MIN_PRIVATE_SYSCALL + 16u)
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#define MIN_GHOST_SYSCALL ((unsigned int)__ARM_NR_BASE + 0xfff0u)
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#define MAX_SYSCALL (MIN_GHOST_SYSCALL + 4u)
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#define SECCOMP_ARCH AUDIT_ARCH_ARM
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// ARM sigcontext_t is different from i386/x86_64.
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// See </arch/arm/include/asm/sigcontext.h> in the Linux kernel.
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#define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.arm_##_reg)
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// ARM EABI syscall convention.
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#define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, r0)
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#define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, r7)
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#define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, pc)
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#define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, r0)
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#define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, r1)
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#define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, r2)
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#define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, r3)
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#define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, r4)
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#define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, r5)
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#define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
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#define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
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#define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
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instruction_pointer) + 4)
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#define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
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instruction_pointer) + 0)
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#define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
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8*(nr) + 4)
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#define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
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8*(nr) + 0)
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#else
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#error Unsupported target platform
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#endif
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/* Macros to common filters */
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#define VALIDATE_ARCHITECTURE \
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BPF_STMT(BPF_LD+BPF_W+BPF_ABS, SECCOMP_ARCH_IDX), \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, SECCOMP_ARCH, 1, 0), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
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#define EXAMINE_SYSCALL \
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BPF_STMT(BPF_LD+BPF_W+BPF_ABS, SECCOMP_NR_IDX)
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#define ALLOW_SYSCALL(name) \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
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#if defined(__arm__) && (defined(__thumb__) || defined(__ARM_EABI__))
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#define ALLOW_ARM_SYSCALL(name) \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __ARM_NR_##name, 0, 1), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
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#endif
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#define DENY_SYSCALL(name) \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
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#define KILL_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
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#define TRAP_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_TRAP)
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#define ALLOW_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
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#define TRACE_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_TRACE)
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#define ERRNO_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ERRNO)
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#endif // SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
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