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authorTobias Koenig <tobias.koenig@kdab.com>2015-01-03 12:52:05 +0100
committerTobias Koenig <tobias.koenig@kdab.com>2015-01-09 10:59:11 +0100
commitde61130bd48e2a028fea9bd408703805e41fb05b (patch)
treeb4e8f6df20937c6a0028782bc2fe07e78259ac0d
parentddc884c841b770974cefbf0029254560b607d57f (diff)
Seal shared memory on POSIX IPC
Change-Id: I5dc3807af904ad77db82d49b38b4c8e66d2d4de6 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
-rw-r--r--src/corelib/kernel/qsharedmemory_posix.cpp7
1 files changed, 7 insertions, 0 deletions
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;
}