// SPDX-License-Identifier: GPL-2.0 /* * 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/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 <linux/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((gid_t)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((uid_t)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((uid_t)uid); } COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid) { return sys_setfsgid((gid_t)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); }