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Issue 935333002: Update from https://crrev.com/316786 (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 10 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
6 #define SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
7
8 // The Seccomp2 kernel ABI is not part of older versions of glibc.
9 // As we can't break compilation with these versions of the library,
10 // we explicitly define all missing symbols.
11 // If we ever decide that we can now rely on system headers, the following
12 // include files should be enabled:
13 // #include <linux/audit.h>
14 // #include <linux/seccomp.h>
15
16 #include <asm/unistd.h>
17 #include <linux/filter.h>
18
19 #include <sys/cdefs.h>
20 // Old Bionic versions do not have sys/user.h. The if can be removed once we no
21 // longer need to support these old Bionic versions.
22 // All x86_64 builds use a new enough bionic to have sys/user.h.
23 #if !defined(__BIONIC__) || defined(__x86_64__)
24 #include <sys/types.h> // Fix for gcc 4.7, make sure __uint16_t is defined.
25 #include <sys/user.h>
26 #if defined(__mips__)
27 // sys/user.h in eglibc misses size_t definition
28 #include <stddef.h>
29 #endif
30 #endif
31
32 // For audit.h
33 #ifndef EM_ARM
34 #define EM_ARM 40
35 #endif
36 #ifndef EM_386
37 #define EM_386 3
38 #endif
39 #ifndef EM_X86_64
40 #define EM_X86_64 62
41 #endif
42 #ifndef EM_MIPS
43 #define EM_MIPS 8
44 #endif
45 #ifndef EM_AARCH64
46 #define EM_AARCH64 183
47 #endif
48
49 #ifndef __AUDIT_ARCH_64BIT
50 #define __AUDIT_ARCH_64BIT 0x80000000
51 #endif
52 #ifndef __AUDIT_ARCH_LE
53 #define __AUDIT_ARCH_LE 0x40000000
54 #endif
55 #ifndef AUDIT_ARCH_ARM
56 #define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE)
57 #endif
58 #ifndef AUDIT_ARCH_I386
59 #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
60 #endif
61 #ifndef AUDIT_ARCH_X86_64
62 #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
63 #endif
64 #ifndef AUDIT_ARCH_MIPSEL
65 #define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE)
66 #endif
67 #ifndef AUDIT_ARCH_AARCH64
68 #define AUDIT_ARCH_AARCH64 (EM_AARCH64 | __AUDIT_ARCH_64BIT | __AUDIT_ARCH_LE)
69 #endif
70
71 // For prctl.h
72 #ifndef PR_SET_SECCOMP
73 #define PR_SET_SECCOMP 22
74 #define PR_GET_SECCOMP 21
75 #endif
76 #ifndef PR_SET_NO_NEW_PRIVS
77 #define PR_SET_NO_NEW_PRIVS 38
78 #define PR_GET_NO_NEW_PRIVS 39
79 #endif
80 #ifndef IPC_64
81 #define IPC_64 0x0100
82 #endif
83
84 #ifndef BPF_MOD
85 #define BPF_MOD 0x90
86 #endif
87 #ifndef BPF_XOR
88 #define BPF_XOR 0xA0
89 #endif
90
91 // In order to build will older tool chains, we currently have to avoid
92 // including <linux/seccomp.h>. Until that can be fixed (if ever). Rely on
93 // our own definitions of the seccomp kernel ABI.
94 #ifndef SECCOMP_MODE_FILTER
95 #define SECCOMP_MODE_DISABLED 0
96 #define SECCOMP_MODE_STRICT 1
97 #define SECCOMP_MODE_FILTER 2 // User user-supplied filter
98 #endif
99
100 #ifndef SECCOMP_SET_MODE_STRICT
101 #define SECCOMP_SET_MODE_STRICT 0
102 #endif
103 #ifndef SECCOMP_SET_MODE_FILTER
104 #define SECCOMP_SET_MODE_FILTER 1
105 #endif
106 #ifndef SECCOMP_FILTER_FLAG_TSYNC
107 #define SECCOMP_FILTER_FLAG_TSYNC 1
108 #endif
109
110 #ifndef SECCOMP_RET_KILL
111 // Return values supported for BPF filter programs. Please note that the
112 // "illegal" SECCOMP_RET_INVALID is not supported by the kernel, should only
113 // ever be used internally, and would result in the kernel killing our process.
114 #define SECCOMP_RET_KILL 0x00000000U // Kill the task immediately
115 #define SECCOMP_RET_INVALID 0x00010000U // Illegal return value
116 #define SECCOMP_RET_TRAP 0x00030000U // Disallow and force a SIGSYS
117 #define SECCOMP_RET_ERRNO 0x00050000U // Returns an errno
118 #define SECCOMP_RET_TRACE 0x7ff00000U // Pass to a tracer or disallow
119 #define SECCOMP_RET_ALLOW 0x7fff0000U // Allow
120 #define SECCOMP_RET_ACTION 0xffff0000U // Masks for the return value
121 #define SECCOMP_RET_DATA 0x0000ffffU // sections
122 #else
123 #define SECCOMP_RET_INVALID 0x00010000U // Illegal return value
124 #endif
125
126 #ifndef SYS_SECCOMP
127 #define SYS_SECCOMP 1
128 #endif
129
130 // Impose some reasonable maximum BPF program size. Realistically, the
131 // kernel probably has much lower limits. But by limiting to less than
132 // 30 bits, we can ease requirements on some of our data types.
133 #define SECCOMP_MAX_PROGRAM_SIZE (1<<30)
134
135 #if defined(__i386__)
136 #define MIN_SYSCALL 0u
137 #define MAX_PUBLIC_SYSCALL 1024u
138 #define MAX_SYSCALL MAX_PUBLIC_SYSCALL
139 #define SECCOMP_ARCH AUDIT_ARCH_I386
140
141 #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[(_reg)])
142 #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, REG_EAX)
143 #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, REG_EAX)
144 #define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, REG_EIP)
145 #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, REG_EBX)
146 #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, REG_ECX)
147 #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, REG_EDX)
148 #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, REG_ESI)
149 #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, REG_EDI)
150 #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, REG_EBP)
151 #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
152 #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
153 #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
154 instruction_pointer) + 4)
155 #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
156 instruction_pointer) + 0)
157 #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
158 8*(nr) + 4)
159 #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
160 8*(nr) + 0)
161
162
163 #if defined(__BIONIC__)
164 // Old Bionic versions don't have sys/user.h, so we just define regs_struct
165 // directly. This can be removed once we no longer need to support these old
166 // Bionic versions.
167 struct regs_struct {
168 long int ebx;
169 long int ecx;
170 long int edx;
171 long int esi;
172 long int edi;
173 long int ebp;
174 long int eax;
175 long int xds;
176 long int xes;
177 long int xfs;
178 long int xgs;
179 long int orig_eax;
180 long int eip;
181 long int xcs;
182 long int eflags;
183 long int esp;
184 long int xss;
185 };
186 #else
187 typedef user_regs_struct regs_struct;
188 #endif
189
190 #define SECCOMP_PT_RESULT(_regs) (_regs).eax
191 #define SECCOMP_PT_SYSCALL(_regs) (_regs).orig_eax
192 #define SECCOMP_PT_IP(_regs) (_regs).eip
193 #define SECCOMP_PT_PARM1(_regs) (_regs).ebx
194 #define SECCOMP_PT_PARM2(_regs) (_regs).ecx
195 #define SECCOMP_PT_PARM3(_regs) (_regs).edx
196 #define SECCOMP_PT_PARM4(_regs) (_regs).esi
197 #define SECCOMP_PT_PARM5(_regs) (_regs).edi
198 #define SECCOMP_PT_PARM6(_regs) (_regs).ebp
199
200 #elif defined(__x86_64__)
201 #define MIN_SYSCALL 0u
202 #define MAX_PUBLIC_SYSCALL 1024u
203 #define MAX_SYSCALL MAX_PUBLIC_SYSCALL
204 #define SECCOMP_ARCH AUDIT_ARCH_X86_64
205
206 #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[(_reg)])
207 #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, REG_RAX)
208 #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, REG_RAX)
209 #define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, REG_RIP)
210 #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, REG_RDI)
211 #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, REG_RSI)
212 #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, REG_RDX)
213 #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, REG_R10)
214 #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, REG_R8)
215 #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, REG_R9)
216 #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
217 #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
218 #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
219 instruction_pointer) + 4)
220 #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
221 instruction_pointer) + 0)
222 #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
223 8*(nr) + 4)
224 #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
225 8*(nr) + 0)
226
227 typedef user_regs_struct regs_struct;
228 #define SECCOMP_PT_RESULT(_regs) (_regs).rax
229 #define SECCOMP_PT_SYSCALL(_regs) (_regs).orig_rax
230 #define SECCOMP_PT_IP(_regs) (_regs).rip
231 #define SECCOMP_PT_PARM1(_regs) (_regs).rdi
232 #define SECCOMP_PT_PARM2(_regs) (_regs).rsi
233 #define SECCOMP_PT_PARM3(_regs) (_regs).rdx
234 #define SECCOMP_PT_PARM4(_regs) (_regs).r10
235 #define SECCOMP_PT_PARM5(_regs) (_regs).r8
236 #define SECCOMP_PT_PARM6(_regs) (_regs).r9
237
238 #elif defined(__arm__) && (defined(__thumb__) || defined(__ARM_EABI__))
239 // ARM EABI includes "ARM private" system calls starting at |__ARM_NR_BASE|,
240 // and a "ghost syscall private to the kernel", cmpxchg,
241 // at |__ARM_NR_BASE+0x00fff0|.
242 // See </arch/arm/include/asm/unistd.h> in the Linux kernel.
243 #define MIN_SYSCALL ((unsigned int)__NR_SYSCALL_BASE)
244 #define MAX_PUBLIC_SYSCALL (MIN_SYSCALL + 1024u)
245 #define MIN_PRIVATE_SYSCALL ((unsigned int)__ARM_NR_BASE)
246 #define MAX_PRIVATE_SYSCALL (MIN_PRIVATE_SYSCALL + 16u)
247 #define MIN_GHOST_SYSCALL ((unsigned int)__ARM_NR_BASE + 0xfff0u)
248 #define MAX_SYSCALL (MIN_GHOST_SYSCALL + 4u)
249
250 #define SECCOMP_ARCH AUDIT_ARCH_ARM
251
252 // ARM sigcontext_t is different from i386/x86_64.
253 // See </arch/arm/include/asm/sigcontext.h> in the Linux kernel.
254 #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.arm_##_reg)
255 // ARM EABI syscall convention.
256 #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, r0)
257 #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, r7)
258 #define SECCOMP_IP(_ctx) SECCOMP_REG(_ctx, pc)
259 #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, r0)
260 #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, r1)
261 #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, r2)
262 #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, r3)
263 #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, r4)
264 #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, r5)
265 #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
266 #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
267 #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
268 instruction_pointer) + 4)
269 #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
270 instruction_pointer) + 0)
271 #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
272 8*(nr) + 4)
273 #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
274 8*(nr) + 0)
275
276 #if defined(__BIONIC__)
277 // Old Bionic versions don't have sys/user.h, so we just define regs_struct
278 // directly. This can be removed once we no longer need to support these old
279 // Bionic versions.
280 struct regs_struct {
281 unsigned long uregs[18];
282 };
283 #else
284 typedef user_regs regs_struct;
285 #endif
286
287 #define REG_cpsr uregs[16]
288 #define REG_pc uregs[15]
289 #define REG_lr uregs[14]
290 #define REG_sp uregs[13]
291 #define REG_ip uregs[12]
292 #define REG_fp uregs[11]
293 #define REG_r10 uregs[10]
294 #define REG_r9 uregs[9]
295 #define REG_r8 uregs[8]
296 #define REG_r7 uregs[7]
297 #define REG_r6 uregs[6]
298 #define REG_r5 uregs[5]
299 #define REG_r4 uregs[4]
300 #define REG_r3 uregs[3]
301 #define REG_r2 uregs[2]
302 #define REG_r1 uregs[1]
303 #define REG_r0 uregs[0]
304 #define REG_ORIG_r0 uregs[17]
305
306 #define SECCOMP_PT_RESULT(_regs) (_regs).REG_r0
307 #define SECCOMP_PT_SYSCALL(_regs) (_regs).REG_r7
308 #define SECCOMP_PT_IP(_regs) (_regs).REG_pc
309 #define SECCOMP_PT_PARM1(_regs) (_regs).REG_r0
310 #define SECCOMP_PT_PARM2(_regs) (_regs).REG_r1
311 #define SECCOMP_PT_PARM3(_regs) (_regs).REG_r2
312 #define SECCOMP_PT_PARM4(_regs) (_regs).REG_r3
313 #define SECCOMP_PT_PARM5(_regs) (_regs).REG_r4
314 #define SECCOMP_PT_PARM6(_regs) (_regs).REG_r5
315
316 #elif defined(__mips__) && (_MIPS_SIM == _MIPS_SIM_ABI32)
317 #define MIN_SYSCALL __NR_O32_Linux
318 #define MAX_PUBLIC_SYSCALL (MIN_SYSCALL + __NR_Linux_syscalls)
319 #define MAX_SYSCALL MAX_PUBLIC_SYSCALL
320 #define SECCOMP_ARCH AUDIT_ARCH_MIPSEL
321 #define SYSCALL_EIGHT_ARGS
322 // MIPS sigcontext_t is different from i386/x86_64 and ARM.
323 // See </arch/mips/include/uapi/asm/sigcontext.h> in the Linux kernel.
324 #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.gregs[_reg])
325 // Based on MIPS o32 ABI syscall convention.
326 // On MIPS, when indirect syscall is being made (syscall(__NR_foo)),
327 // real identificator (__NR_foo) is not in v0, but in a0
328 #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, 2)
329 #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, 2)
330 #define SECCOMP_IP(_ctx) (_ctx)->uc_mcontext.pc
331 #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, 4)
332 #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, 5)
333 #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, 6)
334 #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, 7)
335 // Only the first 4 arguments of syscall are in registers.
336 // The rest are on the stack.
337 #define SECCOMP_STACKPARM(_ctx, n) (((long *)SECCOMP_REG(_ctx, 29))[(n)])
338 #define SECCOMP_PARM5(_ctx) SECCOMP_STACKPARM(_ctx, 4)
339 #define SECCOMP_PARM6(_ctx) SECCOMP_STACKPARM(_ctx, 5)
340 #define SECCOMP_PARM7(_ctx) SECCOMP_STACKPARM(_ctx, 6)
341 #define SECCOMP_PARM8(_ctx) SECCOMP_STACKPARM(_ctx, 7)
342 #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
343 #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
344 #define SECCOMP_IP_MSB_IDX (offsetof(struct arch_seccomp_data, \
345 instruction_pointer) + 4)
346 #define SECCOMP_IP_LSB_IDX (offsetof(struct arch_seccomp_data, \
347 instruction_pointer) + 0)
348 #define SECCOMP_ARG_MSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
349 8*(nr) + 4)
350 #define SECCOMP_ARG_LSB_IDX(nr) (offsetof(struct arch_seccomp_data, args) + \
351 8*(nr) + 0)
352
353 // On Mips we don't have structures like user_regs or user_regs_struct in
354 // sys/user.h that we could use, so we just define regs_struct directly.
355 struct regs_struct {
356 unsigned long long regs[32];
357 };
358
359 #define REG_a3 regs[7]
360 #define REG_a2 regs[6]
361 #define REG_a1 regs[5]
362 #define REG_a0 regs[4]
363 #define REG_v1 regs[3]
364 #define REG_v0 regs[2]
365
366 #define SECCOMP_PT_RESULT(_regs) (_regs).REG_v0
367 #define SECCOMP_PT_SYSCALL(_regs) (_regs).REG_v0
368 #define SECCOMP_PT_PARM1(_regs) (_regs).REG_a0
369 #define SECCOMP_PT_PARM2(_regs) (_regs).REG_a1
370 #define SECCOMP_PT_PARM3(_regs) (_regs).REG_a2
371 #define SECCOMP_PT_PARM4(_regs) (_regs).REG_a3
372
373 #elif defined(__aarch64__)
374 struct regs_struct {
375 unsigned long long regs[31];
376 unsigned long long sp;
377 unsigned long long pc;
378 unsigned long long pstate;
379 };
380
381 #define MIN_SYSCALL 0u
382 #define MAX_PUBLIC_SYSCALL 279u
383 #define MAX_SYSCALL MAX_PUBLIC_SYSCALL
384 #define SECCOMP_ARCH AUDIT_ARCH_AARCH64
385
386 #define SECCOMP_REG(_ctx, _reg) ((_ctx)->uc_mcontext.regs[_reg])
387
388 #define SECCOMP_RESULT(_ctx) SECCOMP_REG(_ctx, 0)
389 #define SECCOMP_SYSCALL(_ctx) SECCOMP_REG(_ctx, 8)
390 #define SECCOMP_IP(_ctx) (_ctx)->uc_mcontext.pc
391 #define SECCOMP_PARM1(_ctx) SECCOMP_REG(_ctx, 0)
392 #define SECCOMP_PARM2(_ctx) SECCOMP_REG(_ctx, 1)
393 #define SECCOMP_PARM3(_ctx) SECCOMP_REG(_ctx, 2)
394 #define SECCOMP_PARM4(_ctx) SECCOMP_REG(_ctx, 3)
395 #define SECCOMP_PARM5(_ctx) SECCOMP_REG(_ctx, 4)
396 #define SECCOMP_PARM6(_ctx) SECCOMP_REG(_ctx, 5)
397
398 #define SECCOMP_NR_IDX (offsetof(struct arch_seccomp_data, nr))
399 #define SECCOMP_ARCH_IDX (offsetof(struct arch_seccomp_data, arch))
400 #define SECCOMP_IP_MSB_IDX \
401 (offsetof(struct arch_seccomp_data, instruction_pointer) + 4)
402 #define SECCOMP_IP_LSB_IDX \
403 (offsetof(struct arch_seccomp_data, instruction_pointer) + 0)
404 #define SECCOMP_ARG_MSB_IDX(nr) \
405 (offsetof(struct arch_seccomp_data, args) + 8 * (nr) + 4)
406 #define SECCOMP_ARG_LSB_IDX(nr) \
407 (offsetof(struct arch_seccomp_data, args) + 8 * (nr) + 0)
408
409 #define SECCOMP_PT_RESULT(_regs) (_regs).regs[0]
410 #define SECCOMP_PT_SYSCALL(_regs) (_regs).regs[8]
411 #define SECCOMP_PT_IP(_regs) (_regs).pc
412 #define SECCOMP_PT_PARM1(_regs) (_regs).regs[0]
413 #define SECCOMP_PT_PARM2(_regs) (_regs).regs[1]
414 #define SECCOMP_PT_PARM3(_regs) (_regs).regs[2]
415 #define SECCOMP_PT_PARM4(_regs) (_regs).regs[3]
416 #define SECCOMP_PT_PARM5(_regs) (_regs).regs[4]
417 #define SECCOMP_PT_PARM6(_regs) (_regs).regs[5]
418 #else
419 #error Unsupported target platform
420
421 #endif
422
423 #endif // SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
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