site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Karunakar Reddy G writes:

Hi, Thanx for previous help, I do know how to handle user address to use on copyin/copyout functions. I did in this way, it works fine, may be dirty type casting (some what double pointer type) user_addr_t user_buffer = (user_addr_t) foo; where "foo" is void * I/O input structure (32 bit pointer) passed as a argument from user application

How are you communicating with the user-space application? BSD ioctls, or something from IOLib? You must ensure that you're not talking to a 64-bit process, or else you risk copying to/from the wrong address. Since you're using copy{in/out}, that means you're talking to the current process, and you can easily check this with the proc_is64bit() kpi. Drew _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com