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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 13:31:16 +00:00
parent 7541e0753b
commit d2cec7db49
1 changed files with 14 additions and 3 deletions
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17
kernel/system/do_devio.c
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@ -30,6 +30,14 @@ register message *m_ptr; /* pointer to request message */
io_type = m_ptr->DIO_REQUEST & _DIO_TYPEMASK;
io_dir = m_ptr->DIO_REQUEST & _DIO_DIRMASK;
switch (io_type)
{
case _DIO_BYTE: size= 1; break;
case _DIO_WORD: size= 2; break;
case _DIO_LONG: size= 4; break;
default: size= 4; break; /* Be conservative */
}
rp= proc_addr(who_p);
privp= priv(rp);
if (!privp)
@ -55,14 +63,17 @@ register message *m_ptr; /* pointer to request message */
}
if (i >= nr_io_range)
{
kprintf(
"do_devio: I/O port check failed for proc %d, port 0x%x\n",
m_ptr->m_source, port);
return EPERM;
}
}
doit:
if (m_ptr->DIO_PORT & (size-1))
{
kprintf("do_devio: unaligned port 0x%x (size %d)\n",
m_ptr->DIO_PORT, size);
return EPERM;
}
/* Process a single I/O request for byte, word, and long values. */
if (io_dir == _DIO_INPUT) {