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comparison src/os/linux/vm/os_linux.cpp @ 10157:f32b6c267d2e

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8012015: Use PROT_NONE when reserving memory Summary: Reserved memory had PROT_READ+PROT_WRITE access on Linux/bsd, now changed to PROT_NONE. Reviewed-by: dholmes, ctornqvi
author mikael
date Mon, 29 Apr 2013 11:03:49 -0700
parents 8be1318fbe77
children b4081e9714ec
comparison
equal deleted inserted replaced
10156:c53e49efe6a8 10157:f32b6c267d2e
2904 if (fixed) { 2904 if (fixed) {
2905 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); 2905 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address");
2906 flags |= MAP_FIXED; 2906 flags |= MAP_FIXED;
2907 } 2907 }
2908 2908
2909 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 2909 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2910 // to PROT_EXEC if executable when we commit the page. 2910 // touch an uncommitted page. Otherwise, the read/write might
2911 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 2911 // succeed if we have enough swap space to back the physical page.
2912 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2912 flags, -1, 0); 2913 flags, -1, 0);
2913 2914
2914 if (addr != MAP_FAILED) { 2915 if (addr != MAP_FAILED) {
2915 // anon_mmap() should only get called during VM initialization, 2916 // anon_mmap() should only get called during VM initialization,
2916 // don't need lock (actually we can skip locking even it can be called 2917 // don't need lock (actually we can skip locking even it can be called