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msgctl(): move compat to native 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-07-09 08:31:16 -04:00
parent 156d9ed126
commit 4693916846
2 changed files with 133 additions and 132 deletions
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132
ipc/compat.c
View File

@ -50,22 +50,6 @@ struct compat_semid_ds {
unsigned short sem_nsems;
};
struct compat_msqid_ds {
struct compat_ipc_perm msg_perm;
compat_uptr_t msg_first;
compat_uptr_t msg_last;
compat_time_t msg_stime;
compat_time_t msg_rtime;
compat_time_t msg_ctime;
compat_ulong_t msg_lcbytes;
compat_ulong_t msg_lqbytes;
unsigned short msg_cbytes;
unsigned short msg_qnum;
unsigned short msg_qbytes;
compat_ipc_pid_t msg_lspid;
compat_ipc_pid_t msg_lrpid;
};
struct compat_ipc_kludge {
compat_uptr_t msgp;
compat_long_t msgtyp;
@ -391,122 +375,6 @@ COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
msgflg, compat_do_msg_fill);
}
static inline int get_compat_msqid64(struct msqid64_ds *m64,
struct compat_msqid64_ds __user *up64)
{
int err;
if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
return -EFAULT;
err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
return err;
}
static inline int get_compat_msqid(struct msqid64_ds *m,
struct compat_msqid_ds __user *up)
{
int err;
if (!access_ok(VERIFY_READ, up, sizeof(*up)))
return -EFAULT;
err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
return err;
}
static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
struct compat_msqid64_ds __user *up64)
{
int err;
if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
return -EFAULT;
err = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
err |= __put_user(m64->msg_stime, &up64->msg_stime);
err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
return err;
}
static inline int put_compat_msqid_ds(struct msqid64_ds *m,
struct compat_msqid_ds __user *up)
{
int err;
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
return -EFAULT;
err = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
err |= __put_user(m->msg_stime, &up->msg_stime);
err |= __put_user(m->msg_rtime, &up->msg_rtime);
err |= __put_user(m->msg_ctime, &up->msg_ctime);
err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
err |= __put_user(m->msg_qnum, &up->msg_qnum);
err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
err |= __put_user(m->msg_lspid, &up->msg_lspid);
err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
return err;
}
COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
{
int err, err2;
struct msqid64_ds m64;
int version = __compat_ipc_parse_version(&second);
void __user *p;
memset(&m64, 0, sizeof(m64));
switch (second & (~IPC_64)) {
case IPC_INFO:
case IPC_RMID:
case MSG_INFO:
err = sys_msgctl(first, second, uptr);
break;
case IPC_SET:
if (version == IPC_64)
err = get_compat_msqid64(&m64, uptr);
else
err = get_compat_msqid(&m64, uptr);
if (err)
break;
p = compat_alloc_user_space(sizeof(m64));
if (copy_to_user(p, &m64, sizeof(m64)))
err = -EFAULT;
else
err = sys_msgctl(first, second, p);
break;
case IPC_STAT:
case MSG_STAT:
p = compat_alloc_user_space(sizeof(m64));
err = sys_msgctl(first, second, p);
if (err < 0)
break;
if (copy_from_user(&m64, p, sizeof(m64)))
err2 = -EFAULT;
else if (version == IPC_64)
err2 = put_compat_msqid64_ds(&m64, uptr);
else
err2 = put_compat_msqid_ds(&m64, uptr);
if (err2)
err = -EFAULT;
break;
default:
err = -EINVAL;
break;
}
return err;
}
COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
{
unsigned long ret;

133
ipc/msg.c
View File

@ -567,6 +567,139 @@ SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
}
}
#ifdef CONFIG_COMPAT
struct compat_msqid_ds {
struct compat_ipc_perm msg_perm;
compat_uptr_t msg_first;
compat_uptr_t msg_last;
compat_time_t msg_stime;
compat_time_t msg_rtime;
compat_time_t msg_ctime;
compat_ulong_t msg_lcbytes;
compat_ulong_t msg_lqbytes;
unsigned short msg_cbytes;
unsigned short msg_qnum;
unsigned short msg_qbytes;
compat_ipc_pid_t msg_lspid;
compat_ipc_pid_t msg_lrpid;
};
static int copy_compat_msqid_from_user(struct msqid64_ds *out, void __user *buf,
int version)
{
memset(out, 0, sizeof(*out));
if (version == IPC_64) {
struct compat_msqid64_ds *p = buf;
struct compat_ipc64_perm v;
if (copy_from_user(&v, &p->msg_perm, sizeof(v)))
return -EFAULT;
out->msg_perm.uid = v.uid;
out->msg_perm.gid = v.gid;
out->msg_perm.mode = v.mode;
if (get_user(out->msg_qbytes, &p->msg_qbytes))
return -EFAULT;
} else {
struct compat_msqid_ds *p = buf;
struct compat_ipc_perm v;
if (copy_from_user(&v, &p->msg_perm, sizeof(v)))
return -EFAULT;
out->msg_perm.uid = v.uid;
out->msg_perm.gid = v.gid;
out->msg_perm.mode = v.mode;
if (get_user(out->msg_qbytes, &p->msg_qbytes))
return -EFAULT;
}
return 0;
}
static int copy_compat_msqid_to_user(void __user *buf, struct msqid64_ds *in,
int version)
{
if (version == IPC_64) {
struct compat_msqid64_ds v;
memset(&v, 0, sizeof(v));
v.msg_perm.key = in->msg_perm.key;
v.msg_perm.uid = in->msg_perm.uid;
v.msg_perm.gid = in->msg_perm.gid;
v.msg_perm.cuid = in->msg_perm.cuid;
v.msg_perm.cgid = in->msg_perm.cgid;
v.msg_perm.mode = in->msg_perm.mode;
v.msg_perm.seq = in->msg_perm.seq;
v.msg_stime = in->msg_stime;
v.msg_rtime = in->msg_rtime;
v.msg_ctime = in->msg_ctime;
v.msg_cbytes = in->msg_cbytes;
v.msg_qnum = in->msg_qnum;
v.msg_qbytes = in->msg_qbytes;
v.msg_lspid = in->msg_lspid;
v.msg_lrpid = in->msg_lrpid;
return copy_to_user(buf, &v, sizeof(v));
} else {
struct compat_msqid_ds v;
memset(&v, 0, sizeof(v));
v.msg_perm.key = in->msg_perm.key;
SET_UID(v.msg_perm.uid, in->msg_perm.uid);
SET_GID(v.msg_perm.gid, in->msg_perm.gid);
SET_UID(v.msg_perm.cuid, in->msg_perm.cuid);
SET_GID(v.msg_perm.cgid, in->msg_perm.cgid);
v.msg_perm.mode = in->msg_perm.mode;
v.msg_perm.seq = in->msg_perm.seq;
v.msg_stime = in->msg_stime;
v.msg_rtime = in->msg_rtime;
v.msg_ctime = in->msg_ctime;
v.msg_cbytes = in->msg_cbytes;
v.msg_qnum = in->msg_qnum;
v.msg_qbytes = in->msg_qbytes;
v.msg_lspid = in->msg_lspid;
v.msg_lrpid = in->msg_lrpid;
return copy_to_user(buf, &v, sizeof(v));
}
}
COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr)
{
struct ipc_namespace *ns;
int err;
struct msqid64_ds msqid64;
int version = compat_ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;
if (msqid < 0 || cmd < 0)
return -EINVAL;
switch (cmd & (~IPC_64)) {
case IPC_INFO:
case MSG_INFO: {
struct msginfo msginfo;
err = msgctl_info(ns, msqid, cmd, &msginfo);
if (err < 0)
return err;
if (copy_to_user(uptr, &msginfo, sizeof(struct msginfo)))
err = -EFAULT;
return err;
}
case IPC_STAT:
case MSG_STAT:
err = msgctl_stat(ns, msqid, cmd, &msqid64);
if (err < 0)
return err;
if (copy_compat_msqid_to_user(uptr, &msqid64, version))
err = -EFAULT;
return err;
case IPC_SET:
if (copy_compat_msqid_from_user(&msqid64, uptr, version))
return -EFAULT;
/* fallthru */
case IPC_RMID:
return msgctl_down(ns, msqid, cmd, &msqid64);
default:
return -EINVAL;
}
}
#endif
static int testmsg(struct msg_msg *msg, long type, int mode)
{
switch (mode) {