================
@@ -1210,6 +1210,39 @@ static Status LaunchProcessPosixSpawn(const char
*exe_path,
}
}
+ if (launch_info.GetFlags().Test(eLaunchFlagMemoryTagging)) {
+ // The following function configures the spawn attributes to launch the
+ // process with memory tagging explicitly enabled. We look it up
+ // dynamically since it is only available on newer OS. Does nothing on
+ // hardware which does not support MTE.
+ //
+ // int posix_spawnattr_set_use_sec_transition_shims_np(
+ // posix_spawnattr_t *attr, uint32_t flags);
+ //
----------------
yln wrote:
The call of this API (through the function pointer) is the line that does the
work.
```
posix_spawnattr_set_use_sec_transition_shims_np_fn(&attr, 0)
```
It means "launch with memory tagging enabled".
* The naming of this function is unfortunate
* We call through function pointer that is looked up via `dlsym()` because the
function is not available on older OS
* The `flags=0` value allows for future, more specific semantics.
* Everything else is just error handling
https://github.com/llvm/llvm-project/pull/162944
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