Bug#320273: libc0.3: ioctl() incorrectly decodes argument
Package: libc0.3
Version: 2.3.2.ds1-22
Severity: normal
Tags: patch, upstream
Hi,
The following code was failing with error
ioctl: (ipc/mig) server type check failure
#include <sys/ioctl.h>
#include <stdio.h>
int main(void)
{
if (ioctl(1, TIOCDRAIN) < 0)
perror("ioctl");
return 0;
}
And actually any ioctl with no parameter will trigger the same error. I
posted a bug and wrote the attached patch which corrects things. For
details, see upstream bts:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=766
Regards,
Samuel
--- sysdeps/mach/hurd/ioctl.c 2005-07-26 23:26:28.000000000 +0200
+++ sysdeps/mach/hurd/ioctl.c 2005-07-26 23:24:07.000000000 +0200
@@ -79,7 +79,7 @@ __ioctl (int fd, unsigned long int reque
void *p;
#endif
- void *arg;
+ void *arg = NULL;
error_t err;
@@ -130,7 +130,7 @@ __ioctl (int fd, unsigned long int reque
in (_IOT_COUNT1 (type), _IOT_TYPE1 (type));
in (_IOT_COUNT2 (type), _IOT_TYPE2 (type));
}
- else if (_IOC_INOUT (request) == IOC_VOID)
+ else if ((_IOC_INOUT (request) == IOC_VOID) && _IOT_COUNT0 (type))
{
/* The RPC takes a single integer_t argument.
Rather than pointing to the value, ARG is the value itself. */
@@ -197,11 +197,15 @@ __ioctl (int fd, unsigned long int reque
return msg.header.RetCode;
}
- va_list ap;
+ if (_IOT_COUNT0 (type))
+ {
+ /* Data need either be sent, received, or even both. */
+ va_list ap;
- va_start (ap, request);
- arg = va_arg (ap, void *);
- va_end (ap);
+ va_start (ap, request);
+ arg = va_arg (ap, void *);
+ va_end (ap);
+ }
{
/* Check for a registered handler for REQUEST. */
--- sysdeps/mach/hurd/bits/ioctls.h 2005-07-26 23:29:54.000000000 +0200
+++ sysdeps/mach/hurd/bits/ioctls.h 2005-07-26 23:19:56.000000000 +0200
@@ -118,6 +118,7 @@
_IOT_foobar is defined either in this file,
or where struct foobar is defined. */
#define _IO(g, n) _IOC (IOC_VOID, (g), (n), 0)
+#define _IOIW(g, n, t) _IOC (IOC_VOID, (g), (n), _IOC_ENCODE_TYPE (t))
#define _IOR(g, n, t) _IOC (IOC_OUT, (g), (n), _IOC_ENCODE_TYPE (t))
#define _IOW(g, n, t) _IOC (IOC_IN, (g), (n), _IOC_ENCODE_TYPE (t))
#define _IOWR(g, n, t) _IOC (IOC_INOUT, (g), (n), _IOC_ENCODE_TYPE (t))
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