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sysvipc: Return EINVAL for invalid semctl 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 14:29:48 -03:00
parent 574500a108
commit a16d2abd49
3 changed files with 100 additions and 0 deletions
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10
sysdeps/unix/sysv/linux/semctl.c
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@ -158,6 +158,15 @@ __semctl64 (int semid, int semnum, int cmd, ...)
arg64 = va_arg (ap, union semun64);
va_end (ap);
break;
case IPC_RMID: /* arg ignored. */
case GETNCNT:
case GETPID:
case GETVAL:
case GETZCNT:
break;
default:
__set_errno (EINVAL);
return -1;
}
#if __IPC_TIME64
@ -277,6 +286,7 @@ __semctl (int semid, int semnum, int cmd, ...)
arg = va_arg (ap, union semun);
va_end (ap);
break;
/* __semctl64 handles non-supported commands. */
}
struct __semid64_ds semid64;