/* * Conversion between 32-bit and 64-bit native system calls. * * Copyright (C) 2000 Silicon Graphics, Inc. * Written by Ulf Carlsson (ulfc@engr.sgi.com) * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com) */ #include <linux/compiler.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/file.h> #include <linux/smp_lock.h> #include <linux/highuid.h> #include <linux/dirent.h> #include <linux/resource.h> #include <linux/highmem.h> #include <linux/time.h> #include <linux/times.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/skbuff.h> #include <linux/filter.h> #include <linux/shm.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/icmpv6.h> #include <linux/syscalls.h> #include <linux/sysctl.h> #include <linux/utime.h> #include <linux/utsname.h> #include <linux/personality.h> #include <linux/dnotify.h> #include <linux/module.h> #include <linux/binfmts.h> #include <linux/security.h> #include <linux/compat.h> #include <linux/vfs.h> #include <linux/ipc.h> #include <net/sock.h> #include <net/scm.h> #include <asm/compat-signal.h> #include <asm/sim.h> #include <asm/uaccess.h> #include <asm/mmu_context.h> #include <asm/mman.h> /* Use this to get at 32-bit user passed pointers. */ /* A() macro should be used for places where you e.g. have some internal variable u32 and just want to get rid of a compiler warning. AA() has to be used in places where you want to convert a function argument to 32bit pointer or when you e.g. access pt_regs structure and want to consider 32bit registers only. */ #define A(__x) ((unsigned long)(__x)) #define AA(__x) ((unsigned long)((int)__x)) #ifdef __MIPSEB__ #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL)) #endif #ifdef __MIPSEL__ #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL)) #endif /* * Revalidate the inode. This is required for proper NFS attribute caching. */ int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf) { struct compat_stat tmp; if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev)) return -EOVERFLOW; memset(&tmp, 0, sizeof(tmp)); tmp.st_dev = new_encode_dev(stat->dev); tmp.st_ino = stat->ino; if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; SET_UID(tmp.st_uid, stat->uid); SET_GID(tmp.st_gid, stat->gid); tmp.st_rdev = new_encode_dev(stat->rdev); tmp.st_size = stat->size; tmp.st_atime = stat->atime.tv_sec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_ctime = stat->ctime.tv_sec; #ifdef STAT_HAVE_NSEC tmp.st_atime_nsec = stat->atime.tv_nsec; tmp.st_mtime_nsec = stat->mtime.tv_nsec; tmp.st_ctime_nsec = stat->ctime.tv_nsec; #endif tmp.st_blocks = stat->blocks; tmp.st_blksize = stat->blksize; return copy_to_user(statbuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; } asmlinkage unsigned long sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { struct file * file = NULL; unsigned long error; error = -EINVAL; if (pgoff & (~PAGE_MASK >> 12)) goto out; pgoff >>= PAGE_SHIFT-12; if (!(flags & MAP_ANONYMOUS)) { error = -EBADF; file = fget(fd); if (!file) goto out; } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return error; } asmlinkage int sys_truncate64(const char __user *path, unsigned int high, unsigned int low) { if ((int)high < 0) return -EINVAL; return sys_truncate(path, ((long) high << 32) | low); } asmlinkage int sys_ftruncate64(unsigned int fd, unsigned int high, unsigned int low) { if ((int)high < 0) return -EINVAL; return sys_ftruncate(fd, ((long) high << 32) | low); } /* * sys_execve() executes a new program. */ asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs) { int error; char * filename; filename = getname(compat_ptr(regs.regs[4])); error = PTR_ERR(filename); if (IS_ERR(filename)) goto out; error = compat_do_execve(filename, compat_ptr(regs.regs[5]), compat_ptr(regs.regs[6]), ®s); putname(filename); out: return error; } #define RLIM_INFINITY32 0x7fffffff #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x) struct rlimit32 { int rlim_cur; int rlim_max; }; asmlinkage long sys32_truncate64(const char __user * path, unsigned long __dummy, int a2, int a3) { return sys_truncate(path, merge_64(a2, a3)); } asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy, int a2, int a3) { return sys_ftruncate(fd, merge_64(a2, a3)); } static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i) { return (!access_ok(VERIFY_READ, i, sizeof(*i)) || (__get_user(o->tv_sec, &i->tv_sec) | __get_user(o->tv_usec, &i->tv_usec))); } static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i) { return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || (__put_user(i->tv_sec, &o->tv_sec) | __put_user(i->tv_usec, &o->tv_usec))); } extern struct timezone sys_tz; asmlinkage int sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) { if (tv) { struct timeval ktv; do_gettimeofday(&ktv); if (put_tv32(tv, &ktv)) return -EFAULT; } if (tz) { if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) return -EFAULT; } return 0; } static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i) { long usec; if (!access_ok(VERIFY_READ, i, sizeof(*i))) return -EFAULT; if (__get_user(o->tv_sec, &i->tv_sec)) return -EFAULT; if (__get_user(usec, &i->tv_usec)) return -EFAULT; o->tv_nsec = usec * 1000; return 0; } asmlinkage int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) { struct timespec kts; struct timezone ktz; if (tv) { if (get_ts32(&kts, tv)) return -EFAULT; } if (tz) { if (copy_from_user(&ktz, tz, sizeof(ktz))) return -EFAULT; } return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); } asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high, unsigned int offset_low, loff_t __user * result, unsigned int origin) { return sys_llseek(fd, offset_high, offset_low, result, origin); } /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op + lseek back to original location. They fail just like lseek does on non-seekable files. */ asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf, size_t count, u32 unused, u64 a4, u64 a5) { return sys_pread64(fd, buf, count, merge_64(a4, a5)); } asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf, size_t count, u32 unused, u64 a4, u64 a5) { return sys_pwrite64(fd, buf, count, merge_64(a4, a5)); } asmlinkage int sys32_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval) { struct timespec t; int ret; mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); set_fs(old_fs); if (put_user (t.tv_sec, &interval->tv_sec) || __put_user(t.tv_nsec, &interval->tv_nsec)) return -EFAULT; return ret; } #ifdef CONFIG_SYSVIPC asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth) { int version, err; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: /* struct sembuf is the same on 32 and 64bit :)) */ err = sys_semtimedop(first, compat_ptr(ptr), second, NULL); break; case SEMTIMEDOP: err = compat_sys_semtimedop(first, compat_ptr(ptr), second, compat_ptr(fifth)); break; case SEMGET: err = sys_semget(first, second, third); break; case SEMCTL: err = compat_sys_semctl(first, second, third, compat_ptr(ptr)); break; case MSGSND: err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr)); break; case MSGRCV: err = compat_sys_msgrcv(first, second, fifth, third, version, compat_ptr(ptr)); break; case MSGGET: err = sys_msgget((key_t) first, second); break; case MSGCTL: err = compat_sys_msgctl(first, second, compat_ptr(ptr)); break; case SHMAT: err = compat_sys_shmat(first, second, third, version, compat_ptr(ptr)); break; case SHMDT: err = sys_shmdt(compat_ptr(ptr)); break; case SHMGET: err = sys_shmget(first, (unsigned)second, third); break; case SHMCTL: err = compat_sys_shmctl(first, second, compat_ptr(ptr)); break; default: err = -EINVAL; break; } return err; } #else asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth) { return -ENOSYS; } #endif /* CONFIG_SYSVIPC */ #ifdef CONFIG_MIPS32_N32 asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg) { /* compat_sys_semctl expects a pointer to union semun */ u32 __user *uptr = compat_alloc_user_space(sizeof(u32)); if (put_user(arg, uptr)) return -EFAULT; return compat_sys_semctl(semid, semnum, cmd, uptr); } asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg) { return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp)); } asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp, int msgflg) { return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64, compat_ptr(msgp)); } #endif struct sysctl_args32 { compat_caddr_t name; int nlen; compat_caddr_t oldval; compat_caddr_t oldlenp; compat_caddr_t newval; compat_size_t newlen; unsigned int __unused[4]; }; #ifdef CONFIG_SYSCTL_SYSCALL asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args) { struct sysctl_args32 tmp; int error; size_t oldlen; size_t __user *oldlenp = NULL; unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7; if (copy_from_user(&tmp, args, sizeof(tmp))) return -EFAULT; if (tmp.oldval && tmp.oldlenp) { /* Duh, this is ugly and might not work if sysctl_args is in read-only memory, but do_sysctl does indirectly a lot of uaccess in both directions and we'd have to basically copy the whole sysctl.c here, and glibc's __sysctl uses rw memory for the structure anyway. */ if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) || put_user(oldlen, (size_t __user *)addr)) return -EFAULT; oldlenp = (size_t __user *)addr; } lock_kernel(); error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval), oldlenp, (void __user *)A(tmp.newval), tmp.newlen); unlock_kernel(); if (oldlenp) { if (!error) { if (get_user(oldlen, (size_t __user *)addr) || put_user(oldlen, (u32 __user *)A(tmp.oldlenp))) error = -EFAULT; } copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)); } return error; } #endif /* CONFIG_SYSCTL_SYSCALL */ asmlinkage long sys32_newuname(struct new_utsname __user * name) { int ret = 0; down_read(&uts_sem); if (copy_to_user(name, utsname(), sizeof *name)) ret = -EFAULT; up_read(&uts_sem); if (current->personality == PER_LINUX32 && !ret) if (copy_to_user(name->machine, "mips\0\0\0", 8)) ret = -EFAULT; return ret; } asmlinkage int sys32_personality(unsigned long personality) { int ret; personality &= 0xffffffff; if (personality(current->personality) == PER_LINUX32 && personality == PER_LINUX) personality = PER_LINUX32; ret = sys_personality(personality); if (ret == PER_LINUX32) ret = PER_LINUX; return ret; } /* ustat compatibility */ struct ustat32 { compat_daddr_t f_tfree; compat_ino_t f_tinode; char f_fname[6]; char f_fpack[6]; }; extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf); asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32) { int err; struct ustat tmp; struct ustat32 tmp32; mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); err = sys_ustat(dev, (struct ustat __user *)&tmp); set_fs(old_fs); if (err) goto out; memset(&tmp32, 0, sizeof(struct ustat32)); tmp32.f_tfree = tmp.f_tfree; tmp32.f_tinode = tmp.f_tinode; err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0; out: return err; } asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count) { mm_segment_t old_fs = get_fs(); int ret; off_t of; if (offset && get_user(of, offset)) return -EFAULT; set_fs(KERNEL_DS); ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count); set_fs(old_fs); if (offset && put_user(of, offset)) return -EFAULT; return ret; } asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, size_t count) { return sys_readahead(fd, merge_64(a2, a3), count); } asmlinkage long sys32_sync_file_range(int fd, int __pad, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5, int flags) { return sys_sync_file_range(fd, merge_64(a2, a3), merge_64(a4, a5), flags); } asmlinkage long sys32_fadvise64_64(int fd, int __pad, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5, int flags) { return sys_fadvise64_64(fd, merge_64(a2, a3), merge_64(a4, a5), flags); } asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, unsigned offset_a3, unsigned len_a4, unsigned len_a5) { return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), merge_64(len_a4, len_a5)); } save_static_function(sys32_clone); static int noinline __used _sys32_clone(nabi_no_regargs struct pt_regs regs) { unsigned long clone_flags; unsigned long newsp; int __user *parent_tidptr, *child_tidptr; clone_flags = regs.regs[4]; newsp = regs.regs[5]; if (!newsp) newsp = regs.regs[29]; parent_tidptr = (int __user *) regs.regs[6]; /* Use __dummy4 instead of getting it off the stack, so that syscall() works. */ child_tidptr = (int __user *) __dummy4; return do_fork(clone_flags, newsp, ®s, 0, parent_tidptr, child_tidptr); }