1.1 --- a/src/os/bsd/vm/os_bsd.cpp Mon Apr 29 16:36:17 2013 -0400
1.2 +++ b/src/os/bsd/vm/os_bsd.cpp Mon Apr 29 11:03:49 2013 -0700
1.3 @@ -2080,9 +2080,10 @@
1.4 flags |= MAP_FIXED;
1.5 }
1.6
1.7 - // Map uncommitted pages PROT_READ and PROT_WRITE, change access
1.8 - // to PROT_EXEC if executable when we commit the page.
1.9 - addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE,
1.10 + // Map reserved/uncommitted pages PROT_NONE so we fail early if we
1.11 + // touch an uncommitted page. Otherwise, the read/write might
1.12 + // succeed if we have enough swap space to back the physical page.
1.13 + addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
1.14 flags, -1, 0);
1.15
1.16 if (addr != MAP_FAILED) {
