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[PATCH] copy_to_user() from iomem is a bad thing

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2006-05-27 02:11:12 -04:00
parent 6bc540e69a
commit 0645819196
1 changed files with 16 additions and 4 deletions
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20
drivers/char/rio/rioctrl.c
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@ -126,6 +126,18 @@ static int
#define drv_makedev(maj, min) ((((uint) maj & 0xff) << 8) | ((uint) min & 0xff))
static int copy_from_io(void __user *to, void __iomem *from, size_t size)
{
void *buf = kmalloc(size, GFP_KERNEL);
int res = -ENOMEM;
if (buf) {
rio_memcpy_fromio(buf, from, size);
res = copy_to_user(to, buf, size);
kfree(buf);
}
return res;
}
int riocontrol(struct rio_info *p, dev_t dev, int cmd, unsigned long arg, int su)
{
uint Host; /* leave me unsigned! */
@ -893,7 +905,7 @@ int riocontrol(struct rio_info *p, dev_t dev, int cmd, unsigned long arg, int su
** Fetch the parmmap
*/
rio_dprintk(RIO_DEBUG_CTRL, "RIO_PARMS\n");
if (copy_to_user(argp, p->RIOHosts[host].ParmMapP, sizeof(PARM_MAP))) {
if (copy_from_io(argp, p->RIOHosts[host].ParmMapP, sizeof(PARM_MAP))) {
p->RIOError.Error = COPYOUT_FAILED;
rio_dprintk(RIO_DEBUG_CTRL, "RIO_PARMS: Copy out to user space failed\n");
return -EFAULT;
@ -947,7 +959,7 @@ int riocontrol(struct rio_info *p, dev_t dev, int cmd, unsigned long arg, int su
rio_dprintk(RIO_DEBUG_CTRL, "RIO_HOST_DPRAM: Bad copy to user space\n");
return -EFAULT;
}
} else if (copy_to_user(HostDpRam.DpRamP, p->RIOHosts[HostDpRam.HostNum].Caddr, sizeof(struct DpRam))) {
} else if (copy_from_io(HostDpRam.DpRamP, p->RIOHosts[HostDpRam.HostNum].Caddr, sizeof(struct DpRam))) {
p->RIOError.Error = COPYOUT_FAILED;
rio_dprintk(RIO_DEBUG_CTRL, "RIO_HOST_DPRAM: Bad copy to user space\n");
return -EFAULT;
@ -1021,7 +1033,7 @@ int riocontrol(struct rio_info *p, dev_t dev, int cmd, unsigned long arg, int su
}
rio_dprintk(RIO_DEBUG_CTRL, "Request for rup %d from host %d\n", RupReq.RupNum, RupReq.HostNum);
if (copy_to_user(RupReq.RupP, HostP->UnixRups[RupReq.RupNum].RupP, sizeof(struct RUP))) {
if (copy_from_io(RupReq.RupP, HostP->UnixRups[RupReq.RupNum].RupP, sizeof(struct RUP))) {
p->RIOError.Error = COPYOUT_FAILED;
rio_dprintk(RIO_DEBUG_CTRL, "RIO_HOST_RUP: Bad copy to user space\n");
return -EFAULT;
@ -1058,7 +1070,7 @@ int riocontrol(struct rio_info *p, dev_t dev, int cmd, unsigned long arg, int su
}
rio_dprintk(RIO_DEBUG_CTRL, "Request for lpb %d from host %d\n", LpbReq.Link, LpbReq.Host);
if (copy_to_user(LpbReq.LpbP, &HostP->LinkStrP[LpbReq.Link], sizeof(struct LPB))) {
if (copy_from_io(LpbReq.LpbP, &HostP->LinkStrP[LpbReq.Link], sizeof(struct LPB))) {
rio_dprintk(RIO_DEBUG_CTRL, "RIO_HOST_LPB: Bad copy to user space\n");
p->RIOError.Error = COPYOUT_FAILED;
return -EFAULT;