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Disallow unaligned access to I/O ports.

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This commit is contained in:
Philip Homburg 2007-04-23 13:31:45 +00:00
parent d2cec7db49
commit c082f607df
1 changed files with 37 additions and 5 deletions
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42
kernel/system/do_vdevio.c
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@ -119,22 +119,54 @@ register message *m_ptr; /* pointer to request message */
outb( pvb[i].port, pvb[i].value);
break;
case _DIO_WORD: /* word values */
if (io_in) for (i=0; i<vec_size; i++)
if (io_in)
{
for (i=0; i<vec_size; i++)
{
port= pvw[i].port;
if (port & 1) goto bad;
pvw[i].value = inw( pvw[i].port);
else for (i=0; i<vec_size; i++)
}
}
else
{
for (i=0; i<vec_size; i++)
{
port= pvw[i].port;
if (port & 1) goto bad;
outw( pvw[i].port, pvw[i].value);
}
}
break;
default: /* long values */
if (io_in) for (i=0; i<vec_size; i++)
pvl[i].value = inl(pvl[i].port);
else for (i=0; i<vec_size; i++)
if (io_in)
{
for (i=0; i<vec_size; i++)
{
port= pvl[i].port;
if (port & 3) goto bad;
pvl[i].value = inl(pvl[i].port);
}
}
else
{
for (i=0; i<vec_size; i++)
{
port= pvl[i].port;
if (port & 3) goto bad;
outl( pvb[i].port, pvl[i].value);
}
}
}
unlock(13);
/* Almost done, copy back results for input requests. */
if (io_in) phys_copy(vir2phys(vdevio_buf), caller_phys, (phys_bytes) bytes);
return(OK);
bad:
panic("do_vdevio: unaligned port\n", port);
return EPERM;
}
#endif /* USE_VDEVIO */