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Kernel: Disable big process lock for sys$get_stack_bounds
This syscall only reads from the shared m_space field, but that field is only over written to by Process::attach_resources, before the process was initialized (aka, before syscalls can happen), by Process::finalize which is only called after all the process' threads have exited (aka, syscalls can not happen anymore), and by Process::do_exec which calls all other syscall-capable threads before doing so. Space's find_region_containing already holds its own lock, and as such there's no need to hold the big lock.
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2 changed files with 2 additions and 2 deletions
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@ -177,7 +177,7 @@ enum class NeedsBigProcessLock {
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S(unveil, NeedsBigProcessLock::Yes) \
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S(perf_event, NeedsBigProcessLock::Yes) \
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S(shutdown, NeedsBigProcessLock::Yes) \
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S(get_stack_bounds, NeedsBigProcessLock::Yes) \
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S(get_stack_bounds, NeedsBigProcessLock::No) \
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S(ptrace, NeedsBigProcessLock::Yes) \
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S(sendfd, NeedsBigProcessLock::Yes) \
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S(recvfd, NeedsBigProcessLock::Yes) \
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