Question around memory permissions

[re-fox]

I was building support for Kernel32.dll, IsBadStringPtr and seeking guidance.

This is largely a copy of IsBadReadPtr with adjustments made for string width.

    @apihook('IsBadStringPtr', argc=2)
    def IsBadStringPtr(self, emu, argv, ctx={}):
        '''
        BOOL IsBadStringPtrW(
            LPCWSTR  lpsz,
            UINT_PTR ucchMax
        );
        '''
        lp, ucchMax = argv
        cw = self.get_char_width(ctx)
        rv = True
        if lp and ucchMax:
            v1 = emu.is_address_valid(lp)
            v2 = emu.is_address_valid(lp + (cw*ucchMax - cw))
            if v1 and v2:
                rv = False
        return rv

The question I have: If I wanted to explicitly check for R permissions of the memory section. What's the best way to do that? I'm assuming that I would get_address_map and then READ_PERMISSION & mm.get_prot()?

mm = emu.get_address_map(lp)
if READ_PERM & mm.get_prot():
   <do something>