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6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE

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Make reguard_stack change access to RW, not execute and use os::protect_memory with the new parameter when change needed to X.

Reviewed-by: acorn, jcoomes
This commit is contained in:
Coleen Phillimore 2008-12-10 15:14:29 -08:00
parent 36f5b8dd54
commit e0d2bfab81
8 changed files with 21 additions and 14 deletions
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9
hotspot/src/os/windows/vm/os_windows.cpp
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@ -2020,10 +2020,11 @@ LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
(UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
// Unguard and retry
// Set memory to RWX and retry
address page_start =
(address) align_size_down((intptr_t) addr, (intptr_t) page_size);
bool res = os::unguard_memory((char*) page_start, page_size);
bool res = os::protect_memory((char*) page_start, page_size,
os::MEM_PROT_RWX);
if (PrintMiscellaneous && Verbose) {
char buf[256];
@ -2755,12 +2756,12 @@ bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
bool os::guard_memory(char* addr, size_t bytes) {
DWORD old_status;
return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0;
return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
}
bool os::unguard_memory(char* addr, size_t bytes) {
DWORD old_status;
return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0;
return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
}
void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }