mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 16:46:52 +07:00
6dd0d2d22a
For some reason, the implementation of some 16-bit ID system calls (namely, setuid16/setgid16 and setfsuid16/setfsgid16) used type cast instead of low2highgid/low2highuid macros for converting [GU]IDs, which led to incorrect handling of value of -1 (which ought to be considered invalid). Discovered by strace test suite. Cc: stable@vger.kernel.org Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
521 lines
13 KiB
C
521 lines
13 KiB
C
// 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(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;
|
|
}
|
|
|
|
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);
|
|
}
|