[llvm-bugs] [Bug 36913] New: Clang and LLVM should provide a documented & supported way to scrub registers and memory buffers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36913

            Bug ID: 36913
           Summary: Clang and LLVM should provide a documented & supported
                    way to scrub registers and memory buffers
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: chandlerc at gmail.com
                CC: echristo at gmail.com, jdennett at google.com,
                    llvm-bugs at lists.llvm.org

Here, "scrub" means specifically in the context of protecting secrets such as
cryptographic private key data.

Currently, libraries that wish to reliably remove private key data from
registers or memory buffers have no well documented and reliable approach
because these operations are fundamentally "dead" and could be removed by the
optimizer. We need to come up with the programmer APIs that we think are
reasonable to use in crypto code and reasonable to implement. Then we need to
implement them across each layer and document their usage.

This is just an umbrella bug to track this and point people at when they are
interested in Clang and LLVM growing this kind of functionality.

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