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ipc: move compat shmctl to native
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Signed-off-by: Al Viro <[email protected]>
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Al Viro committed Jul 16, 2017
1 parent 9ba720c commit 553f770
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Showing 3 changed files with 231 additions and 235 deletions.
233 changes: 3 additions & 230 deletions ipc/compat.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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));

Expand Down Expand Up @@ -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));
Expand Down Expand Up @@ -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)
Expand Down
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