From de61130bd48e2a028fea9bd408703805e41fb05b Mon Sep 17 00:00:00 2001
From: Tobias Koenig <tobias.koenig@kdab.com>
Date: Sat, 3 Jan 2015 12:52:05 +0100
Subject: Seal shared memory on POSIX IPC

Change-Id: I5dc3807af904ad77db82d49b38b4c8e66d2d4de6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 src/corelib/kernel/qsharedmemory_posix.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/corelib/kernel/qsharedmemory_posix.cpp')

diff --git a/src/corelib/kernel/qsharedmemory_posix.cpp b/src/corelib/kernel/qsharedmemory_posix.cpp
index 74b810bec6..0015bda8d9 100644
--- a/src/corelib/kernel/qsharedmemory_posix.cpp
+++ b/src/corelib/kernel/qsharedmemory_posix.cpp
@@ -173,6 +173,13 @@ bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode)
         return false;
     }
 
+#ifdef F_ADD_SEALS
+    // Make sure the shared memory region will not shrink
+    // otherwise someone could cause SIGBUS on us.
+    // (see http://lwn.net/Articles/594919/)
+    fcntl(hand, F_ADD_SEALS, F_SEAL_SHRINK);
+#endif
+
     return true;
 }
 
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