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sysvipc: Return EINVAL for invalid shmctl commands

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It avoids regressions on possible future commands that might require
additional libc support.  The downside is new commands added by newer
kernels will need further glibc support.

Checked on x86_64-linux-gnu and i686-linux-gnu (Linux v4.15 and v5.4).
This commit is contained in:
Adhemerval Zanella
2020-09-29 14:55:02 -03:00
parent a49d7fd4f7
commit 9ebaabeaac
3 changed files with 69 additions and 13 deletions
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44
sysdeps/unix/sysv/linux/shmctl.c
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@ -88,25 +88,49 @@ __shmctl64 (int shmid, int cmd, struct __shmid64_ds *buf)
{
#if __IPC_TIME64
struct kernel_shmid64_ds kshmid, *arg = NULL;
if (buf != NULL)
#else
shmctl_arg_t *arg;
#endif
switch (cmd)
{
/* This is a Linux extension where kernel expects either a
'struct shminfo' (IPC_INFO) or 'struct shm_info' (SHM_INFO). */
if (cmd == IPC_INFO || cmd == SHM_INFO)
arg = (struct kernel_shmid64_ds *) buf;
else
case IPC_RMID:
case SHM_LOCK:
case SHM_UNLOCK:
arg = NULL;
break;
case IPC_SET:
case IPC_STAT:
case SHM_STAT:
case SHM_STAT_ANY:
#if __IPC_TIME64
if (buf != NULL)
{
shmid64_to_kshmid64 (buf, &kshmid);
arg = &kshmid;
}
}
# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
if (cmd == IPC_SET)
arg->shm_perm.mode *= 0x10000U;
if (cmd == IPC_SET)
arg->shm_perm.mode *= 0x10000U;
# endif
#else
shmctl_arg_t *arg = buf;
arg = buf;
#endif
break;
case IPC_INFO:
case SHM_INFO:
/* This is a Linux extension where kernel expects either a
'struct shminfo' (IPC_INFO) or 'struct shm_info' (SHM_INFO). */
arg = (__typeof__ (arg)) buf;
break;
default:
__set_errno (EINVAL);
return -1;
}
int ret = shmctl_syscall (shmid, cmd, arg);
if (ret < 0)