Hello, I am on a 4.2-BETA system (yes I know its time to upgrade) and have question about memory protection. I am trying to use the mprotect syscall to change the protection of a page aligned memory buffer (which was allocated with malloc). The size of the buffer i want to protect is also a page multiple. The call succeeds but then appears to have protected more than I asked for. In fact I am takign a SIGBUS trying to touch a page about 10 pages before the start of the buffer I passed to mprotect. I read in the mprotect man page: Not all implementations will guarantee protection on a page basis; the granularity of protection changes may be as large as an entire region. What does this mean? What's a region? Why can't I change the protection on a per-page basis? Perhaps another syscall does this? Do I need to mmap before I mprotect? Is there any way to do this without mmapping? Much appreciate the help, Scott -- Scott Gasch [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
