From 57bc3c07018463ad6d069850be9f2bce5c450dd6 Mon Sep 17 00:00:00 2001
From: vanhauser-thc <vh@thc.org>
Date: Mon, 13 Dec 2021 15:45:41 +0100
Subject: fix qemu/unicorn oob

---
 src/afl-sharedmem.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/afl-sharedmem.c b/src/afl-sharedmem.c
index 7fb8f821..09941d61 100644
--- a/src/afl-sharedmem.c
+++ b/src/afl-sharedmem.c
@@ -242,6 +242,9 @@ u8 *afl_shm_init(sharedmem_t *shm, size_t map_size,
 #else
   u8 *shm_str;
 
+  // handle qemu/unicorn compcov map overwrite
+  if (map_size == MAP_SIZE) { map_size += 8; }
+
   shm->shm_id =
       shmget(IPC_PRIVATE, map_size, IPC_CREAT | IPC_EXCL | DEFAULT_PERMISSION);
   if (shm->shm_id < 0) {
-- 
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