aboutsummaryrefslogtreecommitdiff
path: root/ipc/shm.c
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2017-07-08 22:52:47 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-15 20:46:42 -0400
commit553f770ef71b27ee053bd241bef0998a15f43467 (patch)
treeb23887b5e7d6ce16c9bc0627f26748e500ad5177 /ipc/shm.c
parent9ba720c18622b250c0abeccbcea1b03531a92277 (diff)
download96b-common-553f770ef71b27ee053bd241bef0998a15f43467.tar.gz
ipc: move compat shmctl to native
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc/shm.c')
-rw-r--r--ipc/shm.c209
1 files changed, 204 insertions, 5 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index b4073c08d0e8..87334ee3acb3 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1030,7 +1030,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
{
int err, version;
struct ipc_namespace *ns;
- struct shmid64_ds tbuf;
+ struct shmid64_ds sem64;
if (cmd < 0 || shmid < 0)
return -EINVAL;
@@ -1059,18 +1059,19 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
}
case SHM_STAT:
case IPC_STAT: {
- err = shmctl_stat(ns, shmid, cmd, &tbuf);
+ err = shmctl_stat(ns, shmid, cmd, &sem64);
if (err < 0)
return err;
- if (copy_shmid_to_user(buf, &tbuf, version))
+ if (copy_shmid_to_user(buf, &sem64, version))
err = -EFAULT;
return err;
}
case IPC_SET:
- if (copy_shmid_from_user(&tbuf, buf, version))
+ if (copy_shmid_from_user(&sem64, buf, version))
return -EFAULT;
+ /* fallthru */
case IPC_RMID:
- return shmctl_down(ns, shmid, cmd, &tbuf);
+ return shmctl_down(ns, shmid, cmd, &sem64);
case SHM_LOCK:
case SHM_UNLOCK:
return shmctl_do_lock(ns, shmid, cmd);
@@ -1079,6 +1080,204 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
}
}
+#ifdef CONFIG_COMPAT
+
+struct compat_shmid_ds {
+ struct compat_ipc_perm shm_perm;
+ int shm_segsz;
+ compat_time_t shm_atime;
+ compat_time_t shm_dtime;
+ compat_time_t shm_ctime;
+ compat_ipc_pid_t shm_cpid;
+ compat_ipc_pid_t shm_lpid;
+ unsigned short shm_nattch;
+ unsigned short shm_unused;
+ compat_uptr_t shm_unused2;
+ compat_uptr_t shm_unused3;
+};
+
+struct compat_shminfo64 {
+ compat_ulong_t shmmax;
+ compat_ulong_t shmmin;
+ compat_ulong_t shmmni;
+ compat_ulong_t shmseg;
+ compat_ulong_t shmall;
+ compat_ulong_t __unused1;
+ compat_ulong_t __unused2;
+ compat_ulong_t __unused3;
+ compat_ulong_t __unused4;
+};
+
+struct compat_shm_info {
+ compat_int_t used_ids;
+ compat_ulong_t shm_tot, shm_rss, shm_swp;
+ compat_ulong_t swap_attempts, swap_successes;
+};
+
+static int copy_compat_shminfo_to_user(void __user *buf, struct shminfo64 *in,
+ int version)
+{
+ if (in->shmmax > INT_MAX)
+ in->shmmax = INT_MAX;
+ if (version == IPC_64) {
+ struct compat_shminfo64 info;
+ memset(&info, 0, sizeof(info));
+ info.shmmax = in->shmmax;
+ info.shmmin = in->shmmin;
+ info.shmmni = in->shmmni;
+ info.shmseg = in->shmseg;
+ info.shmall = in->shmall;
+ return copy_to_user(buf, &info, sizeof(info));
+ } else {
+ struct shminfo info;
+ memset(&info, 0, sizeof(info));
+ info.shmmax = in->shmmax;
+ info.shmmin = in->shmmin;
+ info.shmmni = in->shmmni;
+ info.shmseg = in->shmseg;
+ info.shmall = in->shmall;
+ return copy_to_user(buf, &info, sizeof(info));
+ }
+}
+
+static int put_compat_shm_info(struct shm_info *ip,
+ struct compat_shm_info __user *uip)
+{
+ struct compat_shm_info info;
+
+ memset(&info, 0, sizeof(info));
+ info.used_ids = ip->used_ids;
+ info.shm_tot = ip->shm_tot;
+ info.shm_rss = ip->shm_rss;
+ info.shm_swp = ip->shm_swp;
+ info.swap_attempts = ip->swap_attempts;
+ info.swap_successes = ip->swap_successes;
+ return copy_to_user(up, &info, sizeof(info));
+}
+
+static int copy_compat_shmid_to_user(void __user *buf, struct shmid64_ds *in,
+ int version)
+{
+ if (version == IPC_64) {
+ struct compat_shmid64_ds v;
+ memset(&v, 0, sizeof(v));
+ v.shm_perm.key = in->shm_perm.key;
+ v.shm_perm.uid = in->shm_perm.uid;
+ v.shm_perm.gid = in->shm_perm.gid;
+ v.shm_perm.cuid = in->shm_perm.cuid;
+ v.shm_perm.cgid = in->shm_perm.cgid;
+ v.shm_perm.mode = in->shm_perm.mode;
+ v.shm_perm.seq = in->shm_perm.seq;
+ v.shm_atime = in->shm_atime;
+ v.shm_dtime = in->shm_dtime;
+ v.shm_ctime = in->shm_ctime;
+ v.shm_segsz = in->shm_segsz;
+ v.shm_nattch = in->shm_nattch;
+ v.shm_cpid = in->shm_cpid;
+ v.shm_lpid = in->shm_lpid;
+ return copy_to_user(buf, &v, sizeof(v));
+ } else {
+ struct compat_shmid_ds v;
+ memset(&v, 0, sizeof(v));
+ v.shm_perm.key = in->shm_perm.key;
+ SET_UID(v.shm_perm.uid, in->shm_perm.uid);
+ SET_GID(v.shm_perm.gid, in->shm_perm.gid);
+ SET_UID(v.shm_perm.cuid, in->shm_perm.cuid);
+ SET_GID(v.shm_perm.cgid, in->shm_perm.cgid);
+ v.shm_perm.mode = in->shm_perm.mode;
+ v.shm_perm.seq = in->shm_perm.seq;
+ v.shm_atime = in->shm_atime;
+ v.shm_dtime = in->shm_dtime;
+ v.shm_ctime = in->shm_ctime;
+ v.shm_segsz = in->shm_segsz;
+ v.shm_nattch = in->shm_nattch;
+ v.shm_cpid = in->shm_cpid;
+ v.shm_lpid = in->shm_lpid;
+ return copy_to_user(buf, &v, sizeof(v));
+ }
+}
+
+static int copy_compat_shmid_from_user(struct shmid64_ds *out, void __user *buf,
+ int version)
+{
+ memset(out, 0, sizeof(*out));
+ if (version == IPC_64) {
+ struct compat_shmid64_ds *p = buf;
+ struct compat_ipc64_perm v;
+ if (copy_from_user(&v, &p->shm_perm, sizeof(v)))
+ return -EFAULT;
+ out->shm_perm.uid = v.uid;
+ out->shm_perm.gid = v.gid;
+ out->shm_perm.mode = v.mode;
+ } else {
+ struct compat_shmid_ds *p = buf;
+ struct compat_ipc_perm v;
+ if (copy_from_user(&v, &p->shm_perm, sizeof(v)))
+ return -EFAULT;
+ out->shm_perm.uid = v.uid;
+ out->shm_perm.gid = v.gid;
+ out->shm_perm.mode = v.mode;
+ }
+ return 0;
+}
+
+COMPAT_SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, void __user *, uptr)
+{
+ struct ipc_namespace *ns;
+ struct shmid64_ds sem64;
+ int version = compat_ipc_parse_version(&cmd);
+ int err;
+
+ ns = current->nsproxy->ipc_ns;
+
+ if (cmd < 0 || shmid < 0)
+ return -EINVAL;
+
+ switch (cmd) {
+ case IPC_INFO: {
+ struct shminfo64 shminfo;
+ err = shmctl_ipc_info(ns, &shminfo);
+ if (err < 0)
+ return err;
+ if (copy_compat_shminfo_to_user(uptr, &shminfo, version))
+ err = -EFAULT;
+ return err;
+ }
+ case SHM_INFO: {
+ struct shm_info shm_info;
+ err = shmctl_shm_info(ns, &shm_info);
+ if (err < 0)
+ return err;
+ if (put_compat_shm_info(&shm_info, uptr))
+ err = -EFAULT;
+ return err;
+ }
+ case IPC_STAT:
+ case SHM_STAT:
+ err = shmctl_stat(ns, shmid, cmd, &sem64);
+ if (err < 0)
+ return err;
+ if (copy_compat_shmid_to_user(&sem64, uptr, version))
+ err = -EFAULT;
+ return err;
+
+ case IPC_SET:
+ if (copy_compat_shmid_from_user(&sem64, uptr, version))
+ return -EFAULT;
+ /* fallthru */
+ case IPC_RMID:
+ return shmctl_down(ns, shmid, cmd, &sem64);
+ case SHM_LOCK:
+ case SHM_UNLOCK:
+ return shmctl_do_lock(ns, shmid, cmd);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return err;
+}
+#endif
+
/*
* Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
*