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authorAl Viro <viro@zeniv.linux.org.uk>2017-07-09 08:31:16 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-15 20:46:43 -0400
commit4693916846269d633a3664586650dbfac2c5562f (patch)
treee7dd196843fc6af4a67b20588403dd696e5262e9 /ipc/msg.c
parentmsgctl(): split the actual work from copyin/copyout (diff)
downloadlinux-dev-4693916846269d633a3664586650dbfac2c5562f.tar.xz
linux-dev-4693916846269d633a3664586650dbfac2c5562f.zip
msgctl(): move compat to native
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc/msg.c')
-rw-r--r--ipc/msg.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 322e7bf8b8d1..3400012e1ce8 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -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) {