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fuzz: Setup virt queue with proper addresses

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To make the fuzzers more focused and more efficient, we now provide
default addresses for the descriptor table, available ring, and used
ring, which ensures the virt-queue has a valid memory layout (e.g. no
overlapping between descriptor tables, available ring, and used ring).

Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2022-09-14 12:57:14 -07:00 committed by Rob Bradford
parent 1d3bb63ec8
commit 67a89f4538
1 changed files with 18 additions and 14 deletions
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32
fuzz/fuzz_targets/block.rs
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@ -24,9 +24,18 @@ use vmm_sys_util::eventfd::{EventFd, EFD_NONBLOCK};
type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;
const QUEUE_DATA_SIZE: usize = 28;
const QUEUE_DATA_SIZE: usize = 4;
const MEM_SIZE: usize = 256 * 1024 * 1024;
const QUEUE_SIZE: u16 = 16; // Max entries in the queue.
// Max entries in the queue.
const QUEUE_SIZE: u16 = 256;
// Guest physical address for descriptor table.
const DESC_TABLE_ADDR: u64 = 0;
const DESC_TABLE_SIZE: u64 = 16_u64 * QUEUE_SIZE as u64;
// Guest physical address for available ring
const AVAIL_RING_ADDR: u64 = DESC_TABLE_ADDR + DESC_TABLE_SIZE;
const AVAIL_RING_SIZE: u64 = 6_u64 + 2 * QUEUE_SIZE as u64;
// Guest physical address for used ring (requires to 4-bytes aligned)
const USED_RING_ADDR: u64 = (AVAIL_RING_ADDR + AVAIL_RING_SIZE + 3) & !3_u64;
fuzz_target!(|bytes| {
if bytes.len() < QUEUE_DATA_SIZE || bytes.len() > (QUEUE_DATA_SIZE + MEM_SIZE) {
@ -106,18 +115,13 @@ fn setup_virt_queue(bytes: &[u8; QUEUE_DATA_SIZE]) -> Queue {
q.set_next_used(bytes[1] as u16);
q.set_event_idx(bytes[2] % 2 != 0);
q.set_size(bytes[3] as u16 % QUEUE_SIZE);
q.set_desc_table_address(
Some(u32::from_le_bytes(bytes[4..8].try_into().unwrap())),
Some(u32::from_le_bytes(bytes[8..12].try_into().unwrap())),
);
q.set_avail_ring_address(
Some(u32::from_le_bytes(bytes[12..16].try_into().unwrap())),
Some(u32::from_le_bytes(bytes[16..20].try_into().unwrap())),
);
q.set_used_ring_address(
Some(u32::from_le_bytes(bytes[20..24].try_into().unwrap())),
Some(u32::from_le_bytes(bytes[24..28].try_into().unwrap())),
);
q.try_set_desc_table_address(GuestAddress(DESC_TABLE_ADDR))
.unwrap();
q.try_set_avail_ring_address(GuestAddress(AVAIL_RING_ADDR))
.unwrap();
q.try_set_used_ring_address(GuestAddress(USED_RING_ADDR))
.unwrap();
q.set_ready(true);
q