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fix high guard page #121

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merged 1 commit into from
Mar 19, 2025
Merged

fix high guard page #121

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6 changes: 3 additions & 3 deletions src/mmap_stack_restore_guard.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -44,19 +44,19 @@ impl StackRestoreGuard {
size_with_guard,
old_stack_limit: get_stack_limit(),
};
// We leave a guard page without read/write access in our allocation.
// We leave two guard pages without read/write access in our allocation.
// There is one guard page below the stack and another above it.
let above_guard_page = new_stack.add(page_size);
#[cfg(not(target_os = "openbsd"))]
let result = libc::mprotect(
above_guard_page,
size_with_guard - page_size,
size_with_guard - 2 * page_size,
libc::PROT_READ | libc::PROT_WRITE,
);
#[cfg(target_os = "openbsd")]
let result = if libc::mmap(
above_guard_page,
size_with_guard - page_size,
size_with_guard - 2 * page_size,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_FIXED | libc::MAP_PRIVATE | libc::MAP_ANON | libc::MAP_STACK,
-1,
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