fcntl: don't cap l_start and l_end values for F_GETLK64 in compat syscall
[sfrench/cifs-2.6.git] / arch / x86 / include / asm / compat.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_COMPAT_H
3 #define _ASM_X86_COMPAT_H
4
5 /*
6  * Architecture specific compatibility types
7  */
8 #include <linux/types.h>
9 #include <linux/sched.h>
10 #include <linux/sched/task_stack.h>
11 #include <asm/processor.h>
12 #include <asm/user32.h>
13 #include <asm/unistd.h>
14
15 #define COMPAT_USER_HZ          100
16 #define COMPAT_UTS_MACHINE      "i686\0\0"
17
18 typedef u32             compat_size_t;
19 typedef s32             compat_ssize_t;
20 typedef s32             compat_time_t;
21 typedef s32             compat_clock_t;
22 typedef s32             compat_pid_t;
23 typedef u16             __compat_uid_t;
24 typedef u16             __compat_gid_t;
25 typedef u32             __compat_uid32_t;
26 typedef u32             __compat_gid32_t;
27 typedef u16             compat_mode_t;
28 typedef u32             compat_ino_t;
29 typedef u16             compat_dev_t;
30 typedef s32             compat_off_t;
31 typedef s64             compat_loff_t;
32 typedef u16             compat_nlink_t;
33 typedef u16             compat_ipc_pid_t;
34 typedef s32             compat_daddr_t;
35 typedef u32             compat_caddr_t;
36 typedef __kernel_fsid_t compat_fsid_t;
37 typedef s32             compat_timer_t;
38 typedef s32             compat_key_t;
39
40 typedef s32             compat_int_t;
41 typedef s32             compat_long_t;
42 typedef s64 __attribute__((aligned(4))) compat_s64;
43 typedef u32             compat_uint_t;
44 typedef u32             compat_ulong_t;
45 typedef u32             compat_u32;
46 typedef u64 __attribute__((aligned(4))) compat_u64;
47 typedef u32             compat_uptr_t;
48
49 struct compat_timespec {
50         compat_time_t   tv_sec;
51         s32             tv_nsec;
52 };
53
54 struct compat_timeval {
55         compat_time_t   tv_sec;
56         s32             tv_usec;
57 };
58
59 struct compat_stat {
60         compat_dev_t    st_dev;
61         u16             __pad1;
62         compat_ino_t    st_ino;
63         compat_mode_t   st_mode;
64         compat_nlink_t  st_nlink;
65         __compat_uid_t  st_uid;
66         __compat_gid_t  st_gid;
67         compat_dev_t    st_rdev;
68         u16             __pad2;
69         u32             st_size;
70         u32             st_blksize;
71         u32             st_blocks;
72         u32             st_atime;
73         u32             st_atime_nsec;
74         u32             st_mtime;
75         u32             st_mtime_nsec;
76         u32             st_ctime;
77         u32             st_ctime_nsec;
78         u32             __unused4;
79         u32             __unused5;
80 };
81
82 struct compat_flock {
83         short           l_type;
84         short           l_whence;
85         compat_off_t    l_start;
86         compat_off_t    l_len;
87         compat_pid_t    l_pid;
88 };
89
90 #define F_GETLK64       12      /*  using 'struct flock64' */
91 #define F_SETLK64       13
92 #define F_SETLKW64      14
93
94 /*
95  * IA32 uses 4 byte alignment for 64 bit quantities,
96  * so we need to pack this structure.
97  */
98 struct compat_flock64 {
99         short           l_type;
100         short           l_whence;
101         compat_loff_t   l_start;
102         compat_loff_t   l_len;
103         compat_pid_t    l_pid;
104 } __attribute__((packed));
105
106 struct compat_statfs {
107         int             f_type;
108         int             f_bsize;
109         int             f_blocks;
110         int             f_bfree;
111         int             f_bavail;
112         int             f_files;
113         int             f_ffree;
114         compat_fsid_t   f_fsid;
115         int             f_namelen;      /* SunOS ignores this field. */
116         int             f_frsize;
117         int             f_flags;
118         int             f_spare[4];
119 };
120
121 #define COMPAT_RLIM_INFINITY            0xffffffff
122
123 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
124
125 #define _COMPAT_NSIG            64
126 #define _COMPAT_NSIG_BPW        32
127
128 typedef u32               compat_sigset_word;
129
130 typedef union compat_sigval {
131         compat_int_t    sival_int;
132         compat_uptr_t   sival_ptr;
133 } compat_sigval_t;
134
135 typedef struct compat_siginfo {
136         int si_signo;
137         int si_errno;
138         int si_code;
139
140         union {
141                 int _pad[128/sizeof(int) - 3];
142
143                 /* kill() */
144                 struct {
145                         unsigned int _pid;      /* sender's pid */
146                         unsigned int _uid;      /* sender's uid */
147                 } _kill;
148
149                 /* POSIX.1b timers */
150                 struct {
151                         compat_timer_t _tid;    /* timer id */
152                         int _overrun;           /* overrun count */
153                         compat_sigval_t _sigval;        /* same as below */
154                         int _sys_private;       /* not to be passed to user */
155                         int _overrun_incr;      /* amount to add to overrun */
156                 } _timer;
157
158                 /* POSIX.1b signals */
159                 struct {
160                         unsigned int _pid;      /* sender's pid */
161                         unsigned int _uid;      /* sender's uid */
162                         compat_sigval_t _sigval;
163                 } _rt;
164
165                 /* SIGCHLD */
166                 struct {
167                         unsigned int _pid;      /* which child */
168                         unsigned int _uid;      /* sender's uid */
169                         int _status;            /* exit code */
170                         compat_clock_t _utime;
171                         compat_clock_t _stime;
172                 } _sigchld;
173
174                 /* SIGCHLD (x32 version) */
175                 struct {
176                         unsigned int _pid;      /* which child */
177                         unsigned int _uid;      /* sender's uid */
178                         int _status;            /* exit code */
179                         compat_s64 _utime;
180                         compat_s64 _stime;
181                 } _sigchld_x32;
182
183                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
184                 struct {
185                         unsigned int _addr;     /* faulting insn/memory ref. */
186                         short int _addr_lsb;    /* Valid LSB of the reported address. */
187                         union {
188                                 /* used when si_code=SEGV_BNDERR */
189                                 struct {
190                                         compat_uptr_t _lower;
191                                         compat_uptr_t _upper;
192                                 } _addr_bnd;
193                                 /* used when si_code=SEGV_PKUERR */
194                                 compat_u32 _pkey;
195                         };
196                 } _sigfault;
197
198                 /* SIGPOLL */
199                 struct {
200                         int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
201                         int _fd;
202                 } _sigpoll;
203
204                 struct {
205                         unsigned int _call_addr; /* calling insn */
206                         int _syscall;   /* triggering system call number */
207                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
208                 } _sigsys;
209         } _sifields;
210 } compat_siginfo_t;
211
212 #define COMPAT_OFF_T_MAX        0x7fffffff
213
214 struct compat_ipc64_perm {
215         compat_key_t key;
216         __compat_uid32_t uid;
217         __compat_gid32_t gid;
218         __compat_uid32_t cuid;
219         __compat_gid32_t cgid;
220         unsigned short mode;
221         unsigned short __pad1;
222         unsigned short seq;
223         unsigned short __pad2;
224         compat_ulong_t unused1;
225         compat_ulong_t unused2;
226 };
227
228 struct compat_semid64_ds {
229         struct compat_ipc64_perm sem_perm;
230         compat_time_t  sem_otime;
231         compat_ulong_t __unused1;
232         compat_time_t  sem_ctime;
233         compat_ulong_t __unused2;
234         compat_ulong_t sem_nsems;
235         compat_ulong_t __unused3;
236         compat_ulong_t __unused4;
237 };
238
239 struct compat_msqid64_ds {
240         struct compat_ipc64_perm msg_perm;
241         compat_time_t  msg_stime;
242         compat_ulong_t __unused1;
243         compat_time_t  msg_rtime;
244         compat_ulong_t __unused2;
245         compat_time_t  msg_ctime;
246         compat_ulong_t __unused3;
247         compat_ulong_t msg_cbytes;
248         compat_ulong_t msg_qnum;
249         compat_ulong_t msg_qbytes;
250         compat_pid_t   msg_lspid;
251         compat_pid_t   msg_lrpid;
252         compat_ulong_t __unused4;
253         compat_ulong_t __unused5;
254 };
255
256 struct compat_shmid64_ds {
257         struct compat_ipc64_perm shm_perm;
258         compat_size_t  shm_segsz;
259         compat_time_t  shm_atime;
260         compat_ulong_t __unused1;
261         compat_time_t  shm_dtime;
262         compat_ulong_t __unused2;
263         compat_time_t  shm_ctime;
264         compat_ulong_t __unused3;
265         compat_pid_t   shm_cpid;
266         compat_pid_t   shm_lpid;
267         compat_ulong_t shm_nattch;
268         compat_ulong_t __unused4;
269         compat_ulong_t __unused5;
270 };
271
272 /*
273  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
274  */
275 typedef struct user_regs_struct compat_elf_gregset_t;
276
277 /* Full regset -- prstatus on x32, otherwise on ia32 */
278 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
279 #define SET_PR_FPVALID(S, V, R) \
280   do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
281   while (0)
282
283 #ifdef CONFIG_X86_X32_ABI
284 #define COMPAT_USE_64BIT_TIME \
285         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
286 #endif
287
288 /*
289  * A pointer passed in from user mode. This should not
290  * be used for syscall parameters, just declare them
291  * as pointers because the syscall entry code will have
292  * appropriately converted them already.
293  */
294
295 static inline void __user *compat_ptr(compat_uptr_t uptr)
296 {
297         return (void __user *)(unsigned long)uptr;
298 }
299
300 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
301 {
302         return (u32)(unsigned long)uptr;
303 }
304
305 static inline void __user *arch_compat_alloc_user_space(long len)
306 {
307         compat_uptr_t sp;
308
309         if (test_thread_flag(TIF_IA32)) {
310                 sp = task_pt_regs(current)->sp;
311         } else {
312                 /* -128 for the x32 ABI redzone */
313                 sp = task_pt_regs(current)->sp - 128;
314         }
315
316         return (void __user *)round_down(sp - len, 16);
317 }
318
319 static inline bool in_x32_syscall(void)
320 {
321 #ifdef CONFIG_X86_X32_ABI
322         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
323                 return true;
324 #endif
325         return false;
326 }
327
328 static inline bool in_compat_syscall(void)
329 {
330         return in_ia32_syscall() || in_x32_syscall();
331 }
332 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
333
334 #endif /* _ASM_X86_COMPAT_H */