From a89648e15988471f3854c99f41ab0e47f131032a Mon Sep 17 00:00:00 2001 From: Tom Date: Sun, 22 Nov 2020 15:25:48 -0700 Subject: Kernel: Inherit shared buffers when forking We need to create a reference for the new PID for each shared buffer that the process had a reference to. If the process subsequently get replaced through exec, those references will be dropped again. But if exec for some reason fails then other code, such as global destructors could still expect having access to them. Fixes #4076 --- Kernel/SharedBuffer.cpp | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'Kernel/SharedBuffer.cpp') diff --git a/Kernel/SharedBuffer.cpp b/Kernel/SharedBuffer.cpp index 29223bcda7..39cd8681aa 100644 --- a/Kernel/SharedBuffer.cpp +++ b/Kernel/SharedBuffer.cpp @@ -121,6 +121,22 @@ void SharedBuffer::share_with(ProcessID peer_pid) sanity_check("share_with (new ref)"); } +void SharedBuffer::share_all_shared_buffers(Process& from_process, Process& with_process) +{ + LOCKER(shared_buffers().lock()); + for (auto& shbuf : shared_buffers().resource()) { + auto& shared_buffer = *shbuf.value; + if (shared_buffer.m_global) + continue; + for (auto& ref : shared_buffer.m_refs) { + if (ref.pid == from_process.pid()) { + shared_buffer.share_with(with_process.pid()); + break; + } + } + } +} + void SharedBuffer::deref_for_process(Process& process) { LOCKER(shared_buffers().lock()); -- cgit v1.2.3