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Passing -1 (or size_t max) to ScopedVMRead would succeed, because the amount of memory to be read would overflow vm_address_t/vm_size_t and turn into something reasonable. ScopedVMRead would return true having only read a miniscule subset of the requested data length. Bug: 1348341 Change-Id: I061a1d86928f211c541a6378a78ee045d489a838 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3791710 Commit-Queue: Justin Cohen <justincohen@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org>