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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
parentshmctl: split the work from copyin/copyout (diff)
downloadlinux-dev-553f770ef71b27ee053bd241bef0998a15f43467.tar.xz
linux-dev-553f770ef71b27ee053bd241bef0998a15f43467.zip
ipc: move compat shmctl to native
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--ipc/compat.c233
-rw-r--r--ipc/shm.c209
-rw-r--r--ipc/util.h24
3 files changed, 231 insertions, 235 deletions
diff --git a/ipc/compat.c b/ipc/compat.c
index 9b3c85f8a538..fbfd6fb0a68d 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -39,16 +39,6 @@ struct compat_msgbuf {
char mtext[1];
};
-struct compat_ipc_perm {
- key_t key;
- __compat_uid_t uid;
- __compat_gid_t gid;
- __compat_uid_t cuid;
- __compat_gid_t cgid;
- compat_mode_t mode;
- unsigned short seq;
-};
-
struct compat_semid_ds {
struct compat_ipc_perm sem_perm;
compat_time_t sem_otime;
@@ -76,44 +66,12 @@ struct compat_msqid_ds {
compat_ipc_pid_t msg_lrpid;
};
-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_ipc_kludge {
compat_uptr_t msgp;
compat_long_t msgtyp;
};
-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 inline int compat_ipc_parse_version(int *cmd)
+static inline int __compat_ipc_parse_version(int *cmd)
{
#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
int version = *cmd & IPC_64;
@@ -241,7 +199,7 @@ static long do_compat_semctl(int first, int second, int third, u32 pad)
int err, err2;
struct semid64_ds sem64;
struct semid64_ds __user *up64;
- int version = compat_ipc_parse_version(&third);
+ int version = __compat_ipc_parse_version(&third);
memset(&sem64, 0, sizeof(sem64));
@@ -499,7 +457,7 @@ 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);
+ int version = __compat_ipc_parse_version(&second);
void __user *p;
memset(&m64, 0, sizeof(m64));
@@ -561,191 +519,6 @@ COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
return (long)ret;
}
-static inline int get_compat_shmid64_ds(struct shmid64_ds *sem64,
- struct compat_shmid64_ds __user *up64)
-{
- if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
- return -EFAULT;
- return __get_compat_ipc64_perm(&sem64->shm_perm, &up64->shm_perm);
-}
-
-static inline int get_compat_shmid_ds(struct shmid64_ds *s,
- struct compat_shmid_ds __user *up)
-{
- if (!access_ok(VERIFY_READ, up, sizeof(*up)))
- return -EFAULT;
- return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
-}
-
-static inline int put_compat_shmid64_ds(struct shmid64_ds *sem64,
- struct compat_shmid64_ds __user *up64)
-{
- int err;
-
- if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
- return -EFAULT;
- err = __put_compat_ipc64_perm(&sem64->shm_perm, &up64->shm_perm);
- err |= __put_user(sem64->shm_atime, &up64->shm_atime);
- err |= __put_user(sem64->shm_dtime, &up64->shm_dtime);
- err |= __put_user(sem64->shm_ctime, &up64->shm_ctime);
- err |= __put_user(sem64->shm_segsz, &up64->shm_segsz);
- err |= __put_user(sem64->shm_nattch, &up64->shm_nattch);
- err |= __put_user(sem64->shm_cpid, &up64->shm_cpid);
- err |= __put_user(sem64->shm_lpid, &up64->shm_lpid);
- return err;
-}
-
-static inline int put_compat_shmid_ds(struct shmid64_ds *s,
- struct compat_shmid_ds __user *up)
-{
- int err;
-
- if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
- return -EFAULT;
- err = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
- err |= __put_user(s->shm_atime, &up->shm_atime);
- err |= __put_user(s->shm_dtime, &up->shm_dtime);
- err |= __put_user(s->shm_ctime, &up->shm_ctime);
- err |= __put_user(s->shm_segsz, &up->shm_segsz);
- err |= __put_user(s->shm_nattch, &up->shm_nattch);
- err |= __put_user(s->shm_cpid, &up->shm_cpid);
- err |= __put_user(s->shm_lpid, &up->shm_lpid);
- return err;
-}
-
-static inline int put_compat_shminfo64(struct shminfo64 *smi,
- struct compat_shminfo64 __user *up64)
-{
- int err;
-
- if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
- return -EFAULT;
- if (smi->shmmax > INT_MAX)
- smi->shmmax = INT_MAX;
- err = __put_user(smi->shmmax, &up64->shmmax);
- err |= __put_user(smi->shmmin, &up64->shmmin);
- err |= __put_user(smi->shmmni, &up64->shmmni);
- err |= __put_user(smi->shmseg, &up64->shmseg);
- err |= __put_user(smi->shmall, &up64->shmall);
- return err;
-}
-
-static inline int put_compat_shminfo(struct shminfo64 *smi,
- struct shminfo __user *up)
-{
- int err;
-
- if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
- return -EFAULT;
- if (smi->shmmax > INT_MAX)
- smi->shmmax = INT_MAX;
- err = __put_user(smi->shmmax, &up->shmmax);
- err |= __put_user(smi->shmmin, &up->shmmin);
- err |= __put_user(smi->shmmni, &up->shmmni);
- err |= __put_user(smi->shmseg, &up->shmseg);
- err |= __put_user(smi->shmall, &up->shmall);
- return err;
-}
-
-static inline int put_compat_shm_info(struct shm_info __user *ip,
- struct compat_shm_info __user *uip)
-{
- int err;
- struct shm_info si;
-
- if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
- copy_from_user(&si, ip, sizeof(si)))
- return -EFAULT;
- err = __put_user(si.used_ids, &uip->used_ids);
- err |= __put_user(si.shm_tot, &uip->shm_tot);
- err |= __put_user(si.shm_rss, &uip->shm_rss);
- err |= __put_user(si.shm_swp, &uip->shm_swp);
- err |= __put_user(si.swap_attempts, &uip->swap_attempts);
- err |= __put_user(si.swap_successes, &uip->swap_successes);
- return err;
-}
-
-COMPAT_SYSCALL_DEFINE3(shmctl, int, first, int, second, void __user *, uptr)
-{
- void __user *p;
- struct shmid64_ds sem64;
- struct shminfo64 smi;
- int err, err2;
- int version = compat_ipc_parse_version(&second);
-
- memset(&sem64, 0, sizeof(sem64));
-
- switch (second & (~IPC_64)) {
- case IPC_RMID:
- case SHM_LOCK:
- case SHM_UNLOCK:
- err = sys_shmctl(first, second, uptr);
- break;
-
- case IPC_INFO:
- p = compat_alloc_user_space(sizeof(smi));
- err = sys_shmctl(first, second, p);
- if (err < 0)
- break;
- if (copy_from_user(&smi, p, sizeof(smi)))
- err2 = -EFAULT;
- else if (version == IPC_64)
- err2 = put_compat_shminfo64(&smi, uptr);
- else
- err2 = put_compat_shminfo(&smi, uptr);
- if (err2)
- err = -EFAULT;
- break;
-
-
- case IPC_SET:
- if (version == IPC_64)
- err = get_compat_shmid64_ds(&sem64, uptr);
- else
- err = get_compat_shmid_ds(&sem64, uptr);
-
- if (err)
- break;
- p = compat_alloc_user_space(sizeof(sem64));
- if (copy_to_user(p, &sem64, sizeof(sem64)))
- err = -EFAULT;
- else
- err = sys_shmctl(first, second, p);
- break;
-
- case IPC_STAT:
- case SHM_STAT:
- p = compat_alloc_user_space(sizeof(sem64));
- err = sys_shmctl(first, second, p);
- if (err < 0)
- break;
- if (copy_from_user(&sem64, p, sizeof(sem64)))
- err2 = -EFAULT;
- else if (version == IPC_64)
- err2 = put_compat_shmid64_ds(&sem64, uptr);
- else
- err2 = put_compat_shmid_ds(&sem64, uptr);
- if (err2)
- err = -EFAULT;
- break;
-
- case SHM_INFO:
- p = compat_alloc_user_space(sizeof(struct shm_info));
- err = sys_shmctl(first, second, p);
- if (err < 0)
- break;
- err2 = put_compat_shm_info(p, uptr);
- if (err2)
- err = -EFAULT;
- break;
-
- default:
- err = -EINVAL;
- break;
- }
- return err;
-}
-
COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
unsigned, nsops,
const struct compat_timespec __user *, timeout)
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.
*
diff --git a/ipc/util.h b/ipc/util.h
index c692010e6f0a..3a3dfe137bee 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -191,4 +191,28 @@ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
const struct ipc_ops *ops, struct ipc_params *params);
void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
+
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+struct compat_ipc_perm {
+ key_t key;
+ __compat_uid_t uid;
+ __compat_gid_t gid;
+ __compat_uid_t cuid;
+ __compat_gid_t cgid;
+ compat_mode_t mode;
+ unsigned short seq;
+};
+
+static inline int compat_ipc_parse_version(int *cmd)
+{
+#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+ int version = *cmd & IPC_64;
+ *cmd &= ~IPC_64;
+ return version;
+#else
+ return IPC_64;
+#endif
+}
+#endif
#endif