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libafl_qemu: access() size can be zero. (#3038)

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Co-authored-by: Dongjia "toka" Zhang <tokazerkje@outlook.com>
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forky2 2025-03-05 19:42:06 +00:00 committed by GitHub
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libafl_qemu/src/modules/usermode/snapshot.rs
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@ -270,7 +270,7 @@ impl SnapshotModule {
pub fn access(&mut self, addr: GuestAddr, size: usize) { pub fn access(&mut self, addr: GuestAddr, size: usize) {
// ASSUMPTION: the access can only cross 2 pages // ASSUMPTION: the access can only cross 2 pages
debug_assert!(size > 0 && size <= SNAPSHOT_PAGE_SIZE); debug_assert!(size <= SNAPSHOT_PAGE_SIZE);
let page = addr & SNAPSHOT_PAGE_MASK; let page = addr & SNAPSHOT_PAGE_MASK;
self.page_access(page); self.page_access(page);
let second_page = (addr + size as GuestAddr - 1) & SNAPSHOT_PAGE_MASK; let second_page = (addr + size as GuestAddr - 1) & SNAPSHOT_PAGE_MASK;