| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__ |
| #define SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__ |
| |
| // The Seccomp2 kernel ABI is not part of older versions of glibc. |
| // As we can't break compilation with these versions of the library, |
| // we explicitly define all missing symbols. |
| // If we ever decide that we can now rely on system headers, the following |
| // include files should be enabled: |
| // #include <linux/audit.h> |
| // #include <linux/seccomp.h> |
| |
| #include <asm/unistd.h> |
| #include <linux/filter.h> |
| |
| #include <sys/cdefs.h> |
| // Old Bionic versions do not have sys/user.h. The if can be removed once we no |
| // longer need to support these old Bionic versions. |
| // All x86_64 builds use a new enough bionic to have sys/user.h. |
| #if !defined(__BIONIC__) || defined(__x86_64__) |
| #include <sys/user.h> |
| #endif |
| |
| // For audit.h |
| #ifndef EM_ARM |
| #define EM_ARM 40 |
| #endif |
| #ifndef EM_386 |
| #define EM_386 3 |
| #endif |
| #ifndef EM_X86_64 |
| #define EM_X86_64 62 |
| #endif |
| |
| #ifndef __AUDIT_ARCH_64BIT |
| #define __AUDIT_ARCH_64BIT 0x80000000 |
| #endif |
| #ifndef __AUDIT_ARCH_LE |
| #define __AUDIT_ARCH_LE 0x40000000 |
| #endif |
| #ifndef AUDIT_ARCH_ARM |
| #define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE) |
| #endif |
| #ifndef AUDIT_ARCH_I386 |
| #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) |
| #endif |
| #ifndef AUDIT_ARCH_X86_64 |
| #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) |
| #endif |
| |
| // For prctl.h |
| #ifndef PR_SET_SECCOMP |
| #define PR_SET_SECCOMP 22 |
| #define PR_GET_SECCOMP 21 |
| #endif |
| #ifndef PR_SET_NO_NEW_PRIVS |
| #define PR_SET_NO_NEW_PRIVS 38 |
| #define PR_GET_NO_NEW_PRIVS 39 |
| #endif |
| #ifndef IPC_64 |
| #define IPC_64 0x0100 |
| #endif |
| |
| #ifndef BPF_MOD |
| #define BPF_MOD 0x90 |
| #endif |
| #ifndef BPF_XOR |
| #define BPF_XOR 0xA0 |
| #endif |
| |
| // In order to build will older tool chains, we currently have to avoid |
| // including <linux/seccomp.h>. Until that can be fixed (if ever). Rely on |
| // our own definitions of the seccomp kernel ABI. |
| #ifndef SECCOMP_MODE_FILTER |
| #define SECCOMP_MODE_DISABLED 0 |
| #define SECCOMP_MODE_STRICT 1 |
| #define SECCOMP_MODE_FILTER 2 // User user-supplied filter |
| #endif |
| |
| #ifndef SECCOMP_RET_KILL |
| // Return values supported for BPF filter programs. Please note that the |
| // "illegal" SECCOMP_RET_INVALID is not supported by the kernel, should only |
| // ever be used internally, and would result in the kernel killing our process. |
| #define SECCOMP_RET_KILL 0x00000000U // Kill the task immediately |
| #define SECCOMP_RET_INVALID 0x00010000U // Illegal return value |
| #define SECCOMP_RET_TRAP 0x00030000U // Disallow and force a SIGSYS |
| #define SECCOMP_RET_ERRNO 0x00050000U // Returns an errno |
| #define SECCOMP_RET_TRACE 0x7ff00000U // Pass to a tracer or disallow |
| #define SECCOMP_RET_ALLOW 0x7fff0000U // Allow |
| #define SECCOMP_RET_ACTION 0xffff0000U // Masks for the return value |
| #define SECCOMP_RET_DATA 0x0000ffffU // sections |
| #else |
| #define SECCOMP_RET_INVALID 0x00010000U // Illegal return value |
| #endif |
| |
| #ifndef SYS_SECCOMP |
| #define SYS_SECCOMP 1 |
| #endif |
| |
| // Impose some reasonable maximum BPF program size. Realistically, the |
| // kernel probably has much lower limits. But by limiting to less than |
| // 30 bits, we can ease requirements on some of our data types. |
| #define SECCOMP_MAX_PROGRAM_SIZE (1<<30) |
| |
| #if defined(__i386__) |
| #define MIN_SYSCALL 0u |
| #define MAX_PUBLIC_SYSCALL 1024u |
| #define MAX_SYSCALL MAX_PUBLIC_SYSCALL |
| #define SECCOMP_ARCH AUDIT_ARCH_I386 |
| |
| #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[(_reg)]) |
| #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, REG_EAX) |
| #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, REG_EAX) |
| #define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, REG_EIP) |
| #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, REG_EBX) |
| #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, REG_ECX) |
| #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, REG_EDX) |
| #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, REG_ESI) |
| #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, REG_EDI) |
| #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, REG_EBP) |
| #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr)) |
| #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch)) |
| #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \ |
| instruction_pointer) + 4) |
| #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \ |
| instruction_pointer) + 0) |
| #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \ |
| 8*(nr) + 4) |
| #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \ |
| 8*(nr) + 0) |
| |
| |
| #if defined(__BIONIC__) |
| // Old Bionic versions don't have sys/user.h, so we just define regs_struct |
| // directly. This can be removed once we no longer need to support these old |
| // Bionic versions. |
| struct regs_struct { |
| long int ebx; |
| long int ecx; |
| long int edx; |
| long int esi; |
| long int edi; |
| long int ebp; |
| long int eax; |
| long int xds; |
| long int xes; |
| long int xfs; |
| long int xgs; |
| long int orig_eax; |
| long int eip; |
| long int xcs; |
| long int eflags; |
| long int esp; |
| long int xss; |
| }; |
| #else |
| typedef user_regs_struct regs_struct; |
| #endif |
| |
| #define SECCOMP_PT_RESULT(_regs) (_regs).eax |
| #define SECCOMP_PT_SYSCALL(_regs) (_regs).orig_eax |
| #define SECCOMP_PT_IP(_regs) (_regs).eip |
| #define SECCOMP_PT_PARM1(_regs) (_regs).ebx |
| #define SECCOMP_PT_PARM2(_regs) (_regs).ecx |
| #define SECCOMP_PT_PARM3(_regs) (_regs).edx |
| #define SECCOMP_PT_PARM4(_regs) (_regs).esi |
| #define SECCOMP_PT_PARM5(_regs) (_regs).edi |
| #define SECCOMP_PT_PARM6(_regs) (_regs).ebp |
| |
| #elif defined(__x86_64__) |
| #define MIN_SYSCALL 0u |
| #define MAX_PUBLIC_SYSCALL 1024u |
| #define MAX_SYSCALL MAX_PUBLIC_SYSCALL |
| #define SECCOMP_ARCH AUDIT_ARCH_X86_64 |
| |
| #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[(_reg)]) |
| #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, REG_RAX) |
| #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, REG_RAX) |
| #define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, REG_RIP) |
| #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, REG_RDI) |
| #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, REG_RSI) |
| #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, REG_RDX) |
| #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, REG_R10) |
| #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, REG_R8) |
| #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, REG_R9) |
| #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr)) |
| #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch)) |
| #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \ |
| instruction_pointer) + 4) |
| #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \ |
| instruction_pointer) + 0) |
| #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \ |
| 8*(nr) + 4) |
| #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \ |
| 8*(nr) + 0) |
| |
| typedef user_regs_struct regs_struct; |
| #define SECCOMP_PT_RESULT(_regs) (_regs).rax |
| #define SECCOMP_PT_SYSCALL(_regs) (_regs).orig_rax |
| #define SECCOMP_PT_IP(_regs) (_regs).rip |
| #define SECCOMP_PT_PARM1(_regs) (_regs).rdi |
| #define SECCOMP_PT_PARM2(_regs) (_regs).rsi |
| #define SECCOMP_PT_PARM3(_regs) (_regs).rdx |
| #define SECCOMP_PT_PARM4(_regs) (_regs).r10 |
| #define SECCOMP_PT_PARM5(_regs) (_regs).r8 |
| #define SECCOMP_PT_PARM6(_regs) (_regs).r9 |
| |
| #elif defined(__arm__) && (defined(__thumb__) || defined(__ARM_EABI__)) |
| // ARM EABI includes "ARM private" system calls starting at |__ARM_NR_BASE|, |
| // and a "ghost syscall private to the kernel", cmpxchg, |
| // at |__ARM_NR_BASE+0x00fff0|. |
| // See </arch/arm/include/asm/unistd.h> in the Linux kernel. |
| #define MIN_SYSCALL ((unsigned int)__NR_SYSCALL_BASE) |
| #define MAX_PUBLIC_SYSCALL (MIN_SYSCALL + 1024u) |
| #define MIN_PRIVATE_SYSCALL ((unsigned int)__ARM_NR_BASE) |
| #define MAX_PRIVATE_SYSCALL (MIN_PRIVATE_SYSCALL + 16u) |
| #define MIN_GHOST_SYSCALL ((unsigned int)__ARM_NR_BASE + 0xfff0u) |
| #define MAX_SYSCALL (MIN_GHOST_SYSCALL + 4u) |
| |
| #define SECCOMP_ARCH AUDIT_ARCH_ARM |
| |
| // ARM sigcontext_t is different from i386/x86_64. |
| // See </arch/arm/include/asm/sigcontext.h> in the Linux kernel. |
| #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.arm_##_reg) |
| // ARM EABI syscall convention. |
| #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, r0) |
| #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, r7) |
| #define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, pc) |
| #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, r0) |
| #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, r1) |
| #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, r2) |
| #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, r3) |
| #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, r4) |
| #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, r5) |
| #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr)) |
| #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch)) |
| #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \ |
| instruction_pointer) + 4) |
| #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \ |
| instruction_pointer) + 0) |
| #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \ |
| 8*(nr) + 4) |
| #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \ |
| 8*(nr) + 0) |
| |
| #if defined(__BIONIC__) |
| // Old Bionic versions don't have sys/user.h, so we just define regs_struct |
| // directly. This can be removed once we no longer need to support these old |
| // Bionic versions. |
| struct regs_struct { |
| unsigned long uregs[18]; |
| }; |
| #else |
| typedef user_regs regs_struct; |
| #endif |
| |
| #define REG_cpsr uregs[16] |
| #define REG_pc uregs[15] |
| #define REG_lr uregs[14] |
| #define REG_sp uregs[13] |
| #define REG_ip uregs[12] |
| #define REG_fp uregs[11] |
| #define REG_r10 uregs[10] |
| #define REG_r9 uregs[9] |
| #define REG_r8 uregs[8] |
| #define REG_r7 uregs[7] |
| #define REG_r6 uregs[6] |
| #define REG_r5 uregs[5] |
| #define REG_r4 uregs[4] |
| #define REG_r3 uregs[3] |
| #define REG_r2 uregs[2] |
| #define REG_r1 uregs[1] |
| #define REG_r0 uregs[0] |
| #define REG_ORIG_r0 uregs[17] |
| |
| #define SECCOMP_PT_RESULT(_regs) (_regs).REG_r0 |
| #define SECCOMP_PT_SYSCALL(_regs) (_regs).REG_r7 |
| #define SECCOMP_PT_IP(_regs) (_regs).REG_pc |
| #define SECCOMP_PT_PARM1(_regs) (_regs).REG_r0 |
| #define SECCOMP_PT_PARM2(_regs) (_regs).REG_r1 |
| #define SECCOMP_PT_PARM3(_regs) (_regs).REG_r2 |
| #define SECCOMP_PT_PARM4(_regs) (_regs).REG_r3 |
| #define SECCOMP_PT_PARM5(_regs) (_regs).REG_r4 |
| #define SECCOMP_PT_PARM6(_regs) (_regs).REG_r5 |
| |
| #else |
| #error Unsupported target platform |
| |
| #endif |
| |
| #endif // SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__ |
