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DM: add spanning devices check for i/o access

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- i/o access whose handler is not registered should
  not be allowed.

Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
This commit is contained in:
Yonghua Huang 2018-05-18 18:57:12 +08:00 committed by lijinxia
parent b55511abd6
commit 9e61accbed
1 changed files with 11 additions and 4 deletions
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15
devicemodel/core/inout.c
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@ -99,19 +99,26 @@ emulate_inout(struct vmctx *ctx, int *pvcpu, struct pio_request *pio_request,
int bytes, flags, in, port;
inout_func_t handler;
void *arg;
int retval;
int i, retval;
bytes = pio_request->size;
in = (pio_request->direction == REQUEST_READ);
port = pio_request->address;
assert(port < MAX_IOPORTS);
assert(port + bytes - 1 < MAX_IOPORTS);
assert(bytes == 1 || bytes == 2 || bytes == 4);
handler = inout_handlers[port].handler;
if (strict && handler == default_inout)
return -1;
if (strict) {
if (handler == default_inout)
return -1;
for (i = 1; i < bytes; i++) {
if (inout_handlers[port + i].handler != handler)
return -1;
}
}
flags = inout_handlers[port].flags;
arg = inout_handlers[port].arg;