3 * Copyright IBM Corp. 2000
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
5 * Gerhard Tonn (ton@de.ibm.com)
6 * Thomas Spatzier (tspat@de.ibm.com)
8 * Conversion between 31bit and 64bit native syscalls.
10 * Heavily inspired by the 32-bit Sparc compat code which is
11 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
12 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
21 #include <linux/file.h>
22 #include <linux/signal.h>
23 #include <linux/resource.h>
24 #include <linux/times.h>
25 #include <linux/smp.h>
26 #include <linux/sem.h>
27 #include <linux/msg.h>
28 #include <linux/shm.h>
29 #include <linux/uio.h>
30 #include <linux/quota.h>
31 #include <linux/module.h>
32 #include <linux/poll.h>
33 #include <linux/personality.h>
34 #include <linux/stat.h>
35 #include <linux/filter.h>
36 #include <linux/highmem.h>
37 #include <linux/highuid.h>
38 #include <linux/mman.h>
39 #include <linux/ipv6.h>
41 #include <linux/icmpv6.h>
42 #include <linux/syscalls.h>
43 #include <linux/sysctl.h>
44 #include <linux/binfmts.h>
45 #include <linux/capability.h>
46 #include <linux/compat.h>
47 #include <linux/vfs.h>
48 #include <linux/ptrace.h>
49 #include <linux/fadvise.h>
50 #include <linux/ipc.h>
51 #include <linux/slab.h>
53 #include <asm/types.h>
54 #include <asm/uaccess.h>
59 #include "compat_linux.h"
61 u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT |
62 PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK |
63 PSW32_MASK_PSTATE | PSW32_ASC_HOME;
65 /* For this source file, we want overflow handling. */
75 #undef SET_OLDSTAT_UID
76 #undef SET_OLDSTAT_GID
80 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
81 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
82 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
83 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
84 #define SET_UID16(var, uid) var = high2lowuid(uid)
85 #define SET_GID16(var, gid) var = high2lowgid(gid)
86 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
87 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
88 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
89 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
90 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
91 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
93 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
95 return sys_chown(filename, low2highuid(user), low2highgid(group));
98 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
100 return sys_lchown(filename, low2highuid(user), low2highgid(group));
103 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
105 return sys_fchown(fd, low2highuid(user), low2highgid(group));
108 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
110 return sys_setregid(low2highgid(rgid), low2highgid(egid));
113 asmlinkage long sys32_setgid16(u16 gid)
115 return sys_setgid((gid_t)gid);
118 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
120 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
123 asmlinkage long sys32_setuid16(u16 uid)
125 return sys_setuid((uid_t)uid);
128 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
130 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
134 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
138 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
139 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
140 retval = put_user(high2lowuid(current->cred->suid), suid);
145 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
147 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
151 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
155 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
156 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
157 retval = put_user(high2lowgid(current->cred->sgid), sgid);
162 asmlinkage long sys32_setfsuid16(u16 uid)
164 return sys_setfsuid((uid_t)uid);
167 asmlinkage long sys32_setfsgid16(u16 gid)
169 return sys_setfsgid((gid_t)gid);
172 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
174 struct user_namespace *user_ns = current_user_ns();
179 for (i = 0; i < group_info->ngroups; i++) {
180 kgid = GROUP_AT(group_info, i);
181 group = (u16)from_kgid_munged(user_ns, kgid);
182 if (put_user(group, grouplist+i))
189 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
191 struct user_namespace *user_ns = current_user_ns();
196 for (i = 0; i < group_info->ngroups; i++) {
197 if (get_user(group, grouplist+i))
200 kgid = make_kgid(user_ns, (gid_t)group);
201 if (!gid_valid(kgid))
204 GROUP_AT(group_info, i) = kgid;
210 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
217 get_group_info(current->cred->group_info);
218 i = current->cred->group_info->ngroups;
220 if (i > gidsetsize) {
224 if (groups16_to_user(grouplist, current->cred->group_info)) {
230 put_group_info(current->cred->group_info);
234 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
236 struct group_info *group_info;
239 if (!capable(CAP_SETGID))
241 if ((unsigned)gidsetsize > NGROUPS_MAX)
244 group_info = groups_alloc(gidsetsize);
247 retval = groups16_from_user(group_info, grouplist);
249 put_group_info(group_info);
253 retval = set_current_groups(group_info);
254 put_group_info(group_info);
259 asmlinkage long sys32_getuid16(void)
261 return high2lowuid(current->cred->uid);
264 asmlinkage long sys32_geteuid16(void)
266 return high2lowuid(current->cred->euid);
269 asmlinkage long sys32_getgid16(void)
271 return high2lowgid(current->cred->gid);
274 asmlinkage long sys32_getegid16(void)
276 return high2lowgid(current->cred->egid);
280 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
282 * This is really horribly ugly.
284 #ifdef CONFIG_SYSVIPC
285 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
287 if (call >> 16) /* hack for backward compatibility */
291 return compat_sys_semtimedop(first, compat_ptr(ptr),
292 second, compat_ptr(third));
294 /* struct sembuf is the same on 32 and 64bit :)) */
295 return sys_semtimedop(first, compat_ptr(ptr),
298 return sys_semget(first, second, third);
300 return compat_sys_semctl(first, second, third,
303 return compat_sys_msgsnd(first, second, third,
306 return compat_sys_msgrcv(first, second, 0, third,
309 return sys_msgget((key_t) first, second);
311 return compat_sys_msgctl(first, second, compat_ptr(ptr));
313 return compat_sys_shmat(first, second, third,
316 return sys_shmdt(compat_ptr(ptr));
318 return sys_shmget(first, (unsigned)second, third);
320 return compat_sys_shmctl(first, second, compat_ptr(ptr));
327 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
332 return sys_truncate(path, (high << 32) | low);
335 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
340 return sys_ftruncate(fd, (high << 32) | low);
343 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
344 struct compat_timespec __user *interval)
348 mm_segment_t old_fs = get_fs ();
351 ret = sys_sched_rr_get_interval(pid,
352 (struct timespec __force __user *) &t);
354 if (put_compat_timespec(&t, interval))
359 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
360 compat_sigset_t __user *oset, size_t sigsetsize)
365 mm_segment_t old_fs = get_fs();
368 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
370 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
373 ret = sys_rt_sigprocmask(how,
374 set ? (sigset_t __force __user *) &s : NULL,
375 oset ? (sigset_t __force __user *) &s : NULL,
380 s32.sig[1] = (s.sig[0] >> 32);
381 s32.sig[0] = s.sig[0];
382 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
388 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
394 mm_segment_t old_fs = get_fs();
397 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
400 s32.sig[1] = (s.sig[0] >> 32);
401 s32.sig[0] = s.sig[0];
402 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
409 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
413 mm_segment_t old_fs = get_fs();
415 if (copy_siginfo_from_user32(&info, uinfo))
418 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
424 * sys32_execve() executes a new program after the asm stub has set
425 * things up for us. This should basically do what I want it to.
427 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
428 compat_uptr_t __user *envp)
430 struct pt_regs *regs = task_pt_regs(current);
434 filename = getname(name);
435 rc = PTR_ERR(filename);
436 if (IS_ERR(filename))
438 rc = compat_do_execve(filename, argv, envp, regs);
441 current->thread.fp_regs.fpc=0;
442 asm volatile("sfpc %0,0" : : "d" (0));
449 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
450 size_t count, u32 poshi, u32 poslo)
452 if ((compat_ssize_t) count < 0)
454 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
457 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
458 size_t count, u32 poshi, u32 poslo)
460 if ((compat_ssize_t) count < 0)
462 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
465 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
467 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
470 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
472 mm_segment_t old_fs = get_fs();
476 if (offset && get_user(of, offset))
480 ret = sys_sendfile(out_fd, in_fd,
481 offset ? (off_t __force __user *) &of : NULL, count);
484 if (offset && put_user(of, offset))
490 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
491 compat_loff_t __user *offset, s32 count)
493 mm_segment_t old_fs = get_fs();
497 if (offset && get_user(lof, offset))
501 ret = sys_sendfile64(out_fd, in_fd,
502 offset ? (loff_t __force __user *) &lof : NULL,
506 if (offset && put_user(lof, offset))
512 struct stat64_emu31 {
513 unsigned long long st_dev;
515 #define STAT64_HAS_BROKEN_ST_INO 1
517 unsigned int st_mode;
518 unsigned int st_nlink;
521 unsigned long long st_rdev;
525 unsigned char __pad4[4];
526 u32 __pad5; /* future possible st_blocks high bits */
527 u32 st_blocks; /* Number 512-byte blocks allocated. */
533 u32 __pad8; /* will be high 32 bits of ctime someday */
534 unsigned long st_ino;
537 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
539 struct stat64_emu31 tmp;
541 memset(&tmp, 0, sizeof(tmp));
543 tmp.st_dev = huge_encode_dev(stat->dev);
544 tmp.st_ino = stat->ino;
545 tmp.__st_ino = (u32)stat->ino;
546 tmp.st_mode = stat->mode;
547 tmp.st_nlink = (unsigned int)stat->nlink;
548 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
549 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
550 tmp.st_rdev = huge_encode_dev(stat->rdev);
551 tmp.st_size = stat->size;
552 tmp.st_blksize = (u32)stat->blksize;
553 tmp.st_blocks = (u32)stat->blocks;
554 tmp.st_atime = (u32)stat->atime.tv_sec;
555 tmp.st_mtime = (u32)stat->mtime.tv_sec;
556 tmp.st_ctime = (u32)stat->ctime.tv_sec;
558 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
561 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
564 int ret = vfs_stat(filename, &stat);
566 ret = cp_stat64(statbuf, &stat);
570 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
573 int ret = vfs_lstat(filename, &stat);
575 ret = cp_stat64(statbuf, &stat);
579 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
582 int ret = vfs_fstat(fd, &stat);
584 ret = cp_stat64(statbuf, &stat);
588 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
589 struct stat64_emu31 __user* statbuf, int flag)
594 error = vfs_fstatat(dfd, filename, &stat, flag);
597 return cp_stat64(statbuf, &stat);
601 * Linux/i386 didn't use to be able to handle more than
602 * 4 system call parameters, so these system calls used a memory
603 * block for parameter passing..
606 struct mmap_arg_struct_emu31 {
610 compat_ulong_t flags;
612 compat_ulong_t offset;
615 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
617 struct mmap_arg_struct_emu31 a;
619 if (copy_from_user(&a, arg, sizeof(a)))
621 if (a.offset & ~PAGE_MASK)
623 a.addr = (unsigned long) compat_ptr(a.addr);
624 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
625 a.offset >> PAGE_SHIFT);
628 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
630 struct mmap_arg_struct_emu31 a;
632 if (copy_from_user(&a, arg, sizeof(a)))
634 a.addr = (unsigned long) compat_ptr(a.addr);
635 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
638 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
640 if ((compat_ssize_t) count < 0)
643 return sys_read(fd, buf, count);
646 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
648 if ((compat_ssize_t) count < 0)
651 return sys_write(fd, buf, count);
655 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
656 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
657 * because the 31 bit values differ from the 64 bit values.
661 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
664 advise = POSIX_FADV_DONTNEED;
665 else if (advise == 5)
666 advise = POSIX_FADV_NOREUSE;
667 return sys_fadvise64(fd, offset, len, advise);
670 struct fadvise64_64_args {
678 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
680 struct fadvise64_64_args a;
682 if ( copy_from_user(&a, args, sizeof(a)) )
685 a.advice = POSIX_FADV_DONTNEED;
686 else if (a.advice == 5)
687 a.advice = POSIX_FADV_NOREUSE;
688 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);