On Mon, Nov 9, 2009 at 5:47 PM, Andrew Morton <[email protected]> wrote:
> What happens if userspace unmaps the memory after telling the kernel to > use it? > > Will processes which try to read the command line get an error reading > /proc? If so, do all the commandline-reading programs in the world > handle this in an appropriate fashion? This case can already occur in the current code; the userspace process would have to munmap() the top of its stack, but it certainly can do so if it tries. In any case, access_process_vm() then returns 0 because of the fault, and thus /proc/pid/cmdline is seen to have zero length. Since a zero-length /proc/pid/cmdline occurs with kernel threads as well, we know this isn't a problem. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
