• Georgia Kouveli's avatar
    Reland "[arm64] Protect return addresses stored on stack" · 73f88b5f
    Georgia Kouveli authored
    This is a reland of 137bfe47
    
    Original change's description:
    > [arm64] Protect return addresses stored on stack
    > 
    > This change uses the Arm v8.3 pointer authentication instructions in
    > order to protect return addresses stored on the stack.  The generated
    > code signs the return address before storing on the stack and
    > authenticates it after loading it. This also changes the stack frame
    > iterator in order to authenticate stored return addresses and re-sign
    > them when needed, as well as the deoptimizer in order to sign saved
    > return addresses when creating new frames. This offers a level of
    > protection against ROP attacks.
    > 
    > This functionality is enabled with the v8_control_flow_integrity flag
    > that this CL introduces.
    > 
    > The code size effect of this change is small for Octane (up to 2% in
    > some cases but mostly much lower) and negligible for larger benchmarks,
    > however code size measurements are rather noisy. The performance impact
    > on current cores (where the instructions are NOPs) is single digit,
    > around 1-2% for ARES-6 and Octane, and tends to be smaller for big
    > cores than for little cores.
    > 
    > Bug: v8:10026
    > Change-Id: I0081f3938c56e2f24d8227e4640032749f4f8368
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1373782
    > Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
    > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
    > Reviewed-by: Georg Neis <neis@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#66239}
    
    Bug: v8:10026
    Change-Id: Id1adfa2e6c713f6977d69aa467986e48fe67b3c2
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2051958Reviewed-by: 's avatarGeorg Neis <neis@chromium.org>
    Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
    Cr-Commit-Position: refs/heads/master@{#66254}
    73f88b5f
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