Two security improvements for GCC

It has often been said that the competition between the GCC and LLVM compilers is good for both of them. One place where that competition shows up is in the area of security features; if one compiler adds a way to harden programs, the other is likely to follow suit. Qing Zhao's session at the 2021 Linux Plumbers Conference told the story of how GCC successfully played catch-up for two security-related features that were of special interest to the kernel community.

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