[Webkit-unassigned] [Bug 148623] New: Implement bmalloc::isASanEnabled for Clang and generic Unix

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148623

            Bug ID: 148623
           Summary: Implement bmalloc::isASanEnabled for Clang and generic
                    Unix
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com

If you only care about Clang (not sure), bmalloc::isASanEnabled could be as simple as:

static bool isASanEnabled()
{
#if defined(__has_feature) && __has_feature(address_sanitizer)
    return true;
#else
    return false;
#endif
}

Unless there is some reason I don't understand for the runtime check.

GCC supports asan but not __has_feature. This runtime check works:

    void *handle = dlopen(nullptr, RTLD_NOW);
    if (!handle)
        return false;
    bool result = !!dlsym(handle, "__asan_poison_memory_region");
    dlclose(handle);
    return result;

I expect that would work fine on Darwin too.

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