• Clemens Backes's avatar
    [wasm] Open a CodeSpaceWriteScope for assembler buffers · be72cc8b
    Clemens Backes authored
    Once we start protecting assembler buffers via PKU, the background
    compile threads need to enable write permissions during compilation in
    order to access them.
    This CL adds that, with a little trick to allow passing {nullptr} to the
    {CodeSpaceWriteScope} for configurations where we do not actually use
    the provided {NativeModule}. This is needed because the background
    compile threads do not keep the {NativeModule} alive during compilation,
    so they also should not pass the potentially dangling pointer to the
    {CodeSpaceWriteScope}.
    
    R=thibaudm@chromium.org
    
    Bug: v8:12809
    Change-Id: I1a1d4d41239a6b4497f8a12fb252d7da76e72e1a
    Cq-Include-Trybots: luci.v8.try:v8_linux64_ubsan_rel_ng
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3593117Reviewed-by: 's avatarThibaud Michaud <thibaudm@chromium.org>
    Commit-Queue: Clemens Backes <clemensb@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#80152}
    be72cc8b
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