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Access control in do_sdevio and do_vdevio

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This commit is contained in:
Philip Homburg
2006-10-20 14:46:55 +00:00
parent dd3ee082b2
commit fd448c332b
2 changed files with 78 additions and 5 deletions
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31
kernel/system/do_sdevio.c
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@@ -26,7 +26,10 @@ register message *m_ptr; /* pointer to request message */
int count = m_ptr->DIO_VEC_SIZE;
long port = m_ptr->DIO_PORT;
phys_bytes phys_buf;
int req_type, req_dir;
int i, req_type, req_dir, io_type, size, nr_io_range;
struct proc *rp;
struct priv *privp;
struct io_range *iorp;
/* Allow safe copies and accesses to SELF */
if ((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) != _DIO_SAFE &&
@@ -73,6 +76,32 @@ register message *m_ptr; /* pointer to request message */
return(EFAULT);
}
rp= proc_addr(who_p);
if (privp && privp->s_flags & CHECK_IO_PORT)
{
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 */
}
port= m_ptr->DIO_PORT;
nr_io_range= privp->s_nr_io_range;
for (i= 0, iorp= privp->s_io_tab; i<nr_io_range; i++, iorp++)
{
if (port >= iorp->ior_base && port+size-1 <= iorp->ior_limit)
break;
}
if (i >= nr_io_range)
{
kprintf(
"do_sdevio: I/O port check failed for proc %d, port 0x%x\n",
m_ptr->m_source, port);
return EPERM;
}
}
/* Perform device I/O for bytes and words. Longs are not supported. */
if (req_dir == _DIO_INPUT) {
switch (req_type) {