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comparison src/os/bsd/vm/os_bsd.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 9ce110b1d14a
comparison
equal deleted inserted replaced
10156:c53e49efe6a8 10157:f32b6c267d2e
2078 if (fixed) { 2078 if (fixed) {
2079 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); 2079 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2080 flags |= MAP_FIXED; 2080 flags |= MAP_FIXED;
2081 } 2081 }
2082 2082
2083 // Map uncommitted pages PROT_READ and PROT_WRITE, change access 2083 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2084 // to PROT_EXEC if executable when we commit the page. 2084 // touch an uncommitted page. Otherwise, the read/write might
2085 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, 2085 // succeed if we have enough swap space to back the physical page.
2086 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2086 flags, -1, 0); 2087 flags, -1, 0);
2087 2088
2088 if (addr != MAP_FAILED) { 2089 if (addr != MAP_FAILED) {
2089 // anon_mmap() should only get called during VM initialization, 2090 // anon_mmap() should only get called during VM initialization,
2090 // don't need lock (actually we can skip locking even it can be called 2091 // don't need lock (actually we can skip locking even it can be called