i#5463: Avoid globals pre-relocation #5464
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Fixes errors that can lead to crashes in relocate_dynamorio, where its access to a function pointer and to the page size can both return garbage pre-relocation. We solve this with assembly to get the current PC, and just using a 4K minimum page size for the backward walk. Tested with the PR #5462 branch where the new client.attach_blocking test crashes without this fix on AArch64. Manually tested on arm as well. Fixes #5463
bete0
approved these changes
Apr 15, 2022
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Fixes errors that can lead to crashes in relocate_dynamorio, where its
access to a function pointer and to the page size can both return
garbage pre-relocation. We solve this with assembly to get the
current PC, and just using a 4K minimum page size for the backward
walk.
Tested with the PR #5462 branch where the new client.attach_blocking
test crashes without this fix on AArch64.
Manually tested on arm as well.
Fixes #5463