| /* |
| * S390 version |
| * Copyright IBM Corp. 2000 |
| * 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 <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| #include <linux/file.h> |
| #include <linux/signal.h> |
| #include <linux/resource.h> |
| #include <linux/times.h> |
| #include <linux/smp.h> |
| #include <linux/sem.h> |
| #include <linux/msg.h> |
| #include <linux/shm.h> |
| #include <linux/uio.h> |
| #include <linux/quota.h> |
| #include <linux/module.h> |
| #include <linux/poll.h> |
| #include <linux/personality.h> |
| #include <linux/stat.h> |
| #include <linux/filter.h> |
| #include <linux/highmem.h> |
| #include <linux/highuid.h> |
| #include <linux/mman.h> |
| #include <linux/ipv6.h> |
| #include <linux/in.h> |
| #include <linux/icmpv6.h> |
| #include <linux/syscalls.h> |
| #include <linux/sysctl.h> |
| #include <linux/binfmts.h> |
| #include <linux/capability.h> |
| #include <linux/compat.h> |
| #include <linux/vfs.h> |
| #include <linux/ptrace.h> |
| #include <linux/fadvise.h> |
| #include <linux/ipc.h> |
| #include <linux/slab.h> |
| |
| #include <asm/types.h> |
| #include <asm/uaccess.h> |
| |
| #include <net/scm.h> |
| #include <net/sock.h> |
| |
| #include "compat_linux.h" |
| |
| /* 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) |
| |
| COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename, |
| u16, user, u16, group) |
| { |
| return sys_chown(filename, low2highuid(user), low2highgid(group)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *, |
| filename, u16, user, u16, group) |
| { |
| return sys_lchown(filename, low2highuid(user), low2highgid(group)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group) |
| { |
| return sys_fchown(fd, low2highuid(user), low2highgid(group)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid) |
| { |
| return sys_setregid(low2highgid(rgid), low2highgid(egid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid) |
| { |
| return sys_setgid(low2highgid(gid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid) |
| { |
| return sys_setreuid(low2highuid(ruid), low2highuid(euid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid) |
| { |
| return sys_setuid(low2highuid(uid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid) |
| { |
| return sys_setresuid(low2highuid(ruid), low2highuid(euid), |
| low2highuid(suid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp, |
| u16 __user *, euidp, u16 __user *, suidp) |
| { |
| const struct cred *cred = current_cred(); |
| int retval; |
| u16 ruid, euid, suid; |
| |
| ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); |
| euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); |
| suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); |
| |
| if (!(retval = put_user(ruid, ruidp)) && |
| !(retval = put_user(euid, euidp))) |
| retval = put_user(suid, suidp); |
| |
| return retval; |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid) |
| { |
| return sys_setresgid(low2highgid(rgid), low2highgid(egid), |
| low2highgid(sgid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp, |
| u16 __user *, egidp, u16 __user *, sgidp) |
| { |
| const struct cred *cred = current_cred(); |
| int retval; |
| u16 rgid, egid, sgid; |
| |
| rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid)); |
| egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid)); |
| sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); |
| |
| if (!(retval = put_user(rgid, rgidp)) && |
| !(retval = put_user(egid, egidp))) |
| retval = put_user(sgid, sgidp); |
| |
| return retval; |
| } |
| |
| COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid) |
| { |
| return sys_setfsuid(low2highuid(uid)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid) |
| { |
| return sys_setfsgid(low2highgid(gid)); |
| } |
| |
| static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) |
| { |
| struct user_namespace *user_ns = current_user_ns(); |
| int i; |
| u16 group; |
| kgid_t kgid; |
| |
| for (i = 0; i < group_info->ngroups; i++) { |
| kgid = group_info->gid[i]; |
| group = (u16)from_kgid_munged(user_ns, kgid); |
| if (put_user(group, grouplist+i)) |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) |
| { |
| struct user_namespace *user_ns = current_user_ns(); |
| int i; |
| u16 group; |
| kgid_t kgid; |
| |
| for (i = 0; i < group_info->ngroups; i++) { |
| if (get_user(group, grouplist+i)) |
| return -EFAULT; |
| |
| kgid = make_kgid(user_ns, (gid_t)group); |
| if (!gid_valid(kgid)) |
| return -EINVAL; |
| |
| group_info->gid[i] = kgid; |
| } |
| |
| return 0; |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist) |
| { |
| const struct cred *cred = current_cred(); |
| int i; |
| |
| if (gidsetsize < 0) |
| return -EINVAL; |
| |
| get_group_info(cred->group_info); |
| i = cred->group_info->ngroups; |
| if (gidsetsize) { |
| if (i > gidsetsize) { |
| i = -EINVAL; |
| goto out; |
| } |
| if (groups16_to_user(grouplist, cred->group_info)) { |
| i = -EFAULT; |
| goto out; |
| } |
| } |
| out: |
| put_group_info(cred->group_info); |
| return i; |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist) |
| { |
| struct group_info *group_info; |
| int retval; |
| |
| if (!may_setgroups()) |
| 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; |
| } |
| |
| groups_sort(group_info); |
| retval = set_current_groups(group_info); |
| put_group_info(group_info); |
| |
| return retval; |
| } |
| |
| COMPAT_SYSCALL_DEFINE0(s390_getuid16) |
| { |
| return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); |
| } |
| |
| COMPAT_SYSCALL_DEFINE0(s390_geteuid16) |
| { |
| return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); |
| } |
| |
| COMPAT_SYSCALL_DEFINE0(s390_getgid16) |
| { |
| return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); |
| } |
| |
| COMPAT_SYSCALL_DEFINE0(s390_getegid16) |
| { |
| return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); |
| } |
| |
| #ifdef CONFIG_SYSVIPC |
| COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second, |
| compat_ulong_t, third, compat_uptr_t, ptr) |
| { |
| if (call >> 16) /* hack for backward compatibility */ |
| return -EINVAL; |
| return compat_sys_ipc(call, first, second, third, ptr, third); |
| } |
| #endif |
| |
| COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low) |
| { |
| return sys_truncate(path, (unsigned long)high << 32 | low); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low) |
| { |
| return sys_ftruncate(fd, (unsigned long)high << 32 | low); |
| } |
| |
| COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf, |
| compat_size_t, count, u32, high, u32, low) |
| { |
| if ((compat_ssize_t) count < 0) |
| return -EINVAL; |
| return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low); |
| } |
| |
| COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf, |
| compat_size_t, count, u32, high, u32, low) |
| { |
| if ((compat_ssize_t) count < 0) |
| return -EINVAL; |
| return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low); |
| } |
| |
| COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count) |
| { |
| return sys_readahead(fd, (unsigned long)high << 32 | low, count); |
| } |
| |
| 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 = from_kuid_munged(current_user_ns(), stat->uid); |
| tmp.st_gid = from_kgid_munged(current_user_ns(), 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; |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_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; |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_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; |
| } |
| |
| COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf) |
| { |
| struct kstat stat; |
| int ret = vfs_fstat(fd, &stat); |
| if (!ret) |
| ret = cp_stat64(statbuf, &stat); |
| return ret; |
| } |
| |
| COMPAT_SYSCALL_DEFINE4(s390_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; |
| }; |
| |
| COMPAT_SYSCALL_DEFINE1(s390_old_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; |
| return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, |
| a.offset >> PAGE_SHIFT); |
| } |
| |
| COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg) |
| { |
| struct mmap_arg_struct_emu31 a; |
| |
| if (copy_from_user(&a, arg, sizeof(a))) |
| return -EFAULT; |
| return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count) |
| { |
| if ((compat_ssize_t) count < 0) |
| return -EINVAL; |
| |
| return sys_read(fd, buf, count); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_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. |
| */ |
| |
| COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise) |
| { |
| if (advise == 4) |
| advise = POSIX_FADV_DONTNEED; |
| else if (advise == 5) |
| advise = POSIX_FADV_NOREUSE; |
| return sys_fadvise64(fd, (unsigned long)high << 32 | low, len, advise); |
| } |
| |
| struct fadvise64_64_args { |
| int fd; |
| long long offset; |
| long long len; |
| int advice; |
| }; |
| |
| COMPAT_SYSCALL_DEFINE1(s390_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); |
| } |
| |
| COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow, |
| u32, nhigh, u32, nlow, unsigned int, flags) |
| { |
| return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow, |
| ((u64)nhigh << 32) + nlow, flags); |
| } |
| |
| COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow, |
| u32, lenhigh, u32, lenlow) |
| { |
| return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow, |
| ((u64)lenhigh << 32) + lenlow); |
| } |