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-rw-r--r--arch/s390/kernel/compat_linux.c681
1 files changed, 681 insertions, 0 deletions
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
new file mode 100644
index 00000000000..ab64bdbab2a
--- /dev/null
+++ b/arch/s390/kernel/compat_linux.c
@@ -0,0 +1,681 @@
+/*
+ * 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 <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"
+
+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;
+ 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;
+ 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) {
+ 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) {
+ 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);
+}