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With this patch, -asan option can detect the error memory access to global variables. So this patch makes a few changes: 1. Add the asanregisterglobals runtime support function, which calls asan runtime function _asan_register_globals to register global variables. 2. Create a new initialization function for the package being compiled. This function initializes an array of instrumented global variables and pass it to function runtime.asanregisterglobals. An instrumented global variable has trailing redzone. 3. Writes the new size of instrumented global variables that have trailing redzones into object file. 4. Notice that the current implementation is only compatible with the ASan library from version v7 to v9. Therefore, using the -asan option requires that the gcc version is not less than 7 and the clang version is less than 4, otherwise a segmentation fault will occur. So this patch adds a check on whether the compiler being used is a supported version in cmd/go. (This is a redo of CL 401775 with a fix for a build break due to an intervening commit that removed the internal/execabs package.) Updates #44853. Change-Id: I719d4ef2b22cb2d5516e1494cd453c3efb47d6c7 Reviewed-on: https://go-review.googlesource.com/c/go/+/403851 Auto-Submit: Bryan Mills <bcmills@google.com> Run-TryBot: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> |
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