• Eric Holk's avatar
    Revert "Reland "[wasm] always allocate memory when guard regions are needed"" · 841ca52c
    Eric Holk authored
    This reverts commit 5e76ff5a.
    
    Reason for revert: tsan failures - https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20TSAN/builds/17574
    
    Original change's description:
    > Reland "[wasm] always allocate memory when guard regions are needed"
    > 
    > This reverts commit 7cf29d8d.
    > 
    > Original change's description:
    > > [wasm] always allocate memory when guard regions are needed
    > >
    > > When using trap handlers, memory references do not get any checks inserted. This
    > > means there is no check for a null memory as happens when the memory size is
    > > 0. Normally this would be correctly caught as an out of bounds access, since the
    > > low memory addresses are not normally mapped. However, if they were mapped for
    > > some reason, we would not catch the out of bounds access.
    > >
    > > The fix is to ensure WebAssembly instances always have a guard region even if
    > > the memory is size 0.
    > >
    > > Bug: chromium:769637
    > 
    > Change-Id: I09fdaea92b7ccb3a6cc9e28392171ec098538a00
    > Reviewed-on: https://chromium-review.googlesource.com/695812
    > Commit-Queue: Eric Holk <eholk@chromium.org>
    > Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
    > Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#48293}
    
    TBR=gdeepti@chromium.org,mtrofin@chromium.org,mlippautz@chromium.org,eholk@chromium.org,eholk@google.com,clemensh@chromium.org
    
    Change-Id: I52d5354126158a92602b08c48703d562ac95075b
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Reviewed-on: https://chromium-review.googlesource.com/699599Reviewed-by: 's avatarEric Holk <eholk@chromium.org>
    Commit-Queue: Eric Holk <eholk@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#48294}
    841ca52c
array-buffer-tracker.h 3.75 KB