/* * arch/s390x/kernel/linux32.c * * S390 version * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Gerhard Tonn (ton@de.ibm.com) * Thomas Spatzier (tspat@de.ibm.com) * * Conversion between 31bit and 64bit native syscalls. * * Heavily inspired by the 32-bit Sparc compat code which is * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "compat_linux.h" u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK | PSW32_MASK_PSTATE | PSW32_ASC_HOME; /* For this source file, we want overflow handling. */ #undef high2lowuid #undef high2lowgid #undef low2highuid #undef low2highgid #undef SET_UID16 #undef SET_GID16 #undef NEW_TO_OLD_UID #undef NEW_TO_OLD_GID #undef SET_OLDSTAT_UID #undef SET_OLDSTAT_GID #undef SET_STAT_UID #undef SET_STAT_GID #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid) #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid) #define SET_UID16(var, uid) var = high2lowuid(uid) #define SET_GID16(var, gid) var = high2lowgid(gid) #define NEW_TO_OLD_UID(uid) high2lowuid(uid) #define NEW_TO_OLD_GID(gid) high2lowgid(gid) #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) { return sys_chown(filename, low2highuid(user), low2highgid(group)); } asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) { return sys_lchown(filename, low2highuid(user), low2highgid(group)); } asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) { return sys_fchown(fd, low2highuid(user), low2highgid(group)); } asmlinkage long sys32_setregid16(u16 rgid, u16 egid) { return sys_setregid(low2highgid(rgid), low2highgid(egid)); } asmlinkage long sys32_setgid16(u16 gid) { return sys_setgid((gid_t)gid); } asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) { return sys_setreuid(low2highuid(ruid), low2highuid(euid)); } asmlinkage long sys32_setuid16(u16 uid) { return sys_setuid((uid_t)uid); } asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) { return sys_setresuid(low2highuid(ruid), low2highuid(euid), low2highuid(suid)); } asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid) { int retval; if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) && !(retval = put_user(high2lowuid(current->cred->euid), euid))) retval = put_user(high2lowuid(current->cred->suid), suid); return retval; } asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) { return sys_setresgid(low2highgid(rgid), low2highgid(egid), low2highgid(sgid)); } asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid) { int retval; if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) && !(retval = put_user(high2lowgid(current->cred->egid), egid))) retval = put_user(high2lowgid(current->cred->sgid), sgid); return retval; } asmlinkage long sys32_setfsuid16(u16 uid) { return sys_setfsuid((uid_t)uid); } asmlinkage long sys32_setfsgid16(u16 gid) { return sys_setfsgid((gid_t)gid); } static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) { int i; u16 group; for (i = 0; i < group_info->ngroups; i++) { group = (u16)GROUP_AT(group_info, i); if (put_user(group, grouplist+i)) return -EFAULT; } return 0; } static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) { int i; u16 group; for (i = 0; i < group_info->ngroups; i++) { if (get_user(group, grouplist+i)) return -EFAULT; GROUP_AT(group_info, i) = (gid_t)group; } return 0; } asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist) { int i; if (gidsetsize < 0) return -EINVAL; get_group_info(current->cred->group_info); i = current->cred->group_info->ngroups; if (gidsetsize) { if (i > gidsetsize) { i = -EINVAL; goto out; } if (groups16_to_user(grouplist, current->cred->group_info)) { i = -EFAULT; goto out; } } out: put_group_info(current->cred->group_info); return i; } asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist) { struct group_info *group_info; int retval; if (!capable(CAP_SETGID)) return -EPERM; if ((unsigned)gidsetsize > NGROUPS_MAX) return -EINVAL; group_info = groups_alloc(gidsetsize); if (!group_info) return -ENOMEM; retval = groups16_from_user(group_info, grouplist); if (retval) { put_group_info(group_info); return retval; } retval = set_current_groups(group_info); put_group_info(group_info); return retval; } asmlinkage long sys32_getuid16(void) { return high2lowuid(current->cred->uid); } asmlinkage long sys32_geteuid16(void) { return high2lowuid(current->cred->euid); } asmlinkage long sys32_getgid16(void) { return high2lowgid(current->cred->gid); } asmlinkage long sys32_getegid16(void) { return high2lowgid(current->cred->egid); } /* * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation. * * This is really horribly ugly. */ #ifdef CONFIG_SYSVIPC asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr) { if (call >> 16) /* hack for backward compatibility */ return -EINVAL; call &= 0xffff; switch (call) { case SEMTIMEDOP: return compat_sys_semtimedop(first, compat_ptr(ptr), second, compat_ptr(third)); case SEMOP: /* struct sembuf is the same on 32 and 64bit :)) */ return sys_semtimedop(first, compat_ptr(ptr), second, NULL); case SEMGET: return sys_semget(first, second, third); case SEMCTL: return compat_sys_semctl(first, second, third, compat_ptr(ptr)); case MSGSND: return compat_sys_msgsnd(first, second, third, compat_ptr(ptr)); case MSGRCV: return compat_sys_msgrcv(first, second, 0, third, 0, compat_ptr(ptr)); case MSGGET: return sys_msgget((key_t) first, second); case MSGCTL: return compat_sys_msgctl(first, second, compat_ptr(ptr)); case SHMAT: return compat_sys_shmat(first, second, third, 0, compat_ptr(ptr)); case SHMDT: return sys_shmdt(compat_ptr(ptr)); case SHMGET: return sys_shmget(first, (unsigned)second, third); case SHMCTL: return compat_sys_shmctl(first, second, compat_ptr(ptr)); } return -ENOSYS; } #endif asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) { if ((int)high < 0) return -EINVAL; else return sys_truncate(path, (high << 32) | low); } asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) { if ((int)high < 0) return -EINVAL; else return sys_ftruncate(fd, (high << 32) | low); } asmlinkage long 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 __force __user *) &t); set_fs (old_fs); if (put_compat_timespec(&t, interval)) return -EFAULT; return ret; } asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *oset, size_t sigsetsize) { sigset_t s; compat_sigset_t s32; int ret; mm_segment_t old_fs = get_fs(); if (set) { if (copy_from_user (&s32, set, sizeof(compat_sigset_t))) return -EFAULT; switch (_NSIG_WORDS) { case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); } } set_fs (KERNEL_DS); ret = sys_rt_sigprocmask(how, set ? (sigset_t __force __user *) &s : NULL, oset ? (sigset_t __force __user *) &s : NULL, sigsetsize); set_fs (old_fs); if (ret) return ret; if (oset) { switch (_NSIG_WORDS) { case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3]; case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2]; case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1]; case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0]; } if (copy_to_user (oset, &s32, sizeof(compat_sigset_t))) return -EFAULT; } return 0; } asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set, size_t sigsetsize) { sigset_t s; compat_sigset_t s32; int ret; mm_segment_t old_fs = get_fs(); set_fs (KERNEL_DS); ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize); set_fs (old_fs); if (!ret) { switch (_NSIG_WORDS) { case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3]; case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2]; case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1]; case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0]; } if (copy_to_user (set, &s32, sizeof(compat_sigset_t))) return -EFAULT; } return ret; } asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo) { siginfo_t info; int ret; mm_segment_t old_fs = get_fs(); if (copy_siginfo_from_user32(&info, uinfo)) return -EFAULT; set_fs (KERNEL_DS); ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info); set_fs (old_fs); return ret; } /* * sys32_execve() executes a new program after the asm stub has set * things up for us. This should basically do what I want it to. */ asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv, compat_uptr_t __user *envp) { struct pt_regs *regs = task_pt_regs(current); char *filename; long rc; filename = getname(name); rc = PTR_ERR(filename); if (IS_ERR(filename)) return rc; rc = compat_do_execve(filename, argv, envp, regs); if (rc) goto out; current->thread.fp_regs.fpc=0; asm volatile("sfpc %0,0" : : "d" (0)); rc = regs->gprs[2]; out: putname(filename); return rc; } asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, size_t count, u32 poshi, u32 poslo) { if ((compat_ssize_t) count < 0) return -EINVAL; return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); } asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, size_t count, u32 poshi, u32 poslo) { if ((compat_ssize_t) count < 0) return -EINVAL; return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); } asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) { return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); } asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t 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 __force __user *) &of : NULL, count); set_fs(old_fs); if (offset && put_user(of, offset)) return -EFAULT; return ret; } asmlinkage long sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count) { mm_segment_t old_fs = get_fs(); int ret; loff_t lof; if (offset && get_user(lof, offset)) return -EFAULT; set_fs(KERNEL_DS); ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __force __user *) &lof : NULL, count); set_fs(old_fs); if (offset && put_user(lof, offset)) return -EFAULT; return ret; } struct stat64_emu31 { unsigned long long st_dev; unsigned int __pad1; #define STAT64_HAS_BROKEN_ST_INO 1 u32 __st_ino; unsigned int st_mode; unsigned int st_nlink; u32 st_uid; u32 st_gid; unsigned long long st_rdev; unsigned int __pad3; long st_size; u32 st_blksize; unsigned char __pad4[4]; u32 __pad5; /* future possible st_blocks high bits */ u32 st_blocks; /* Number 512-byte blocks allocated. */ u32 st_atime; u32 __pad6; u32 st_mtime; u32 __pad7; u32 st_ctime; u32 __pad8; /* will be high 32 bits of ctime someday */ unsigned long st_ino; }; static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) { struct stat64_emu31 tmp; memset(&tmp, 0, sizeof(tmp)); tmp.st_dev = huge_encode_dev(stat->dev); tmp.st_ino = stat->ino; tmp.__st_ino = (u32)stat->ino; tmp.st_mode = stat->mode; tmp.st_nlink = (unsigned int)stat->nlink; tmp.st_uid = stat->uid; tmp.st_gid = stat->gid; tmp.st_rdev = huge_encode_dev(stat->rdev); tmp.st_size = stat->size; tmp.st_blksize = (u32)stat->blksize; tmp.st_blocks = (u32)stat->blocks; tmp.st_atime = (u32)stat->atime.tv_sec; tmp.st_mtime = (u32)stat->mtime.tv_sec; tmp.st_ctime = (u32)stat->ctime.tv_sec; return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; } asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf) { struct kstat stat; int ret = vfs_stat(filename, &stat); if (!ret) ret = cp_stat64(statbuf, &stat); return ret; } asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf) { struct kstat stat; int ret = vfs_lstat(filename, &stat); if (!ret) ret = cp_stat64(statbuf, &stat); return ret; } asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) { struct kstat stat; int ret = vfs_fstat(fd, &stat); if (!ret) ret = cp_stat64(statbuf, &stat); return ret; } asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename, struct stat64_emu31 __user* statbuf, int flag) { struct kstat stat; int error; error = vfs_fstatat(dfd, filename, &stat, flag); if (error) return error; return cp_stat64(statbuf, &stat); } /* * Linux/i386 didn't use to be able to handle more than * 4 system call parameters, so these system calls used a memory * block for parameter passing.. */ struct mmap_arg_struct_emu31 { compat_ulong_t addr; compat_ulong_t len; compat_ulong_t prot; compat_ulong_t flags; compat_ulong_t fd; compat_ulong_t offset; }; asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg) { struct mmap_arg_struct_emu31 a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; if (a.offset & ~PAGE_MASK) return -EINVAL; a.addr = (unsigned long) compat_ptr(a.addr); return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); } asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) { struct mmap_arg_struct_emu31 a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; a.addr = (unsigned long) compat_ptr(a.addr); return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); } asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) { if ((compat_ssize_t) count < 0) return -EINVAL; return sys_read(fd, buf, count); } asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count) { if ((compat_ssize_t) count < 0) return -EINVAL; return sys_write(fd, buf, count); } /* * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} * because the 31 bit values differ from the 64 bit values. */ asmlinkage long sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) { if (advise == 4) advise = POSIX_FADV_DONTNEED; else if (advise == 5) advise = POSIX_FADV_NOREUSE; return sys_fadvise64(fd, offset, len, advise); } struct fadvise64_64_args { int fd; long long offset; long long len; int advice; }; asmlinkage long sys32_fadvise64_64(struct fadvise64_64_args __user *args) { struct fadvise64_64_args a; if ( copy_from_user(&a, args, sizeof(a)) ) return -EFAULT; if (a.advice == 4) a.advice = POSIX_FADV_DONTNEED; else if (a.advice == 5) a.advice = POSIX_FADV_NOREUSE; return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); }