[llvm-bugs] [Bug 47341] New: Support -mstack-protector-guard=sysreg for arm64 and riscv

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47341

            Bug ID: 47341
           Summary: Support -mstack-protector-guard=sysreg for arm64 and
                    riscv
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: keescook at chromium.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

The Linux kernel uses this for having a per-thread stack canary. Implementing
this for both arm64 and riscv is desired.

For example, gcc's arm64 support is used like this in the kernel:

-mstack-protector-guard=sysreg
-mstack-protector-guard-reg=sp_el0
-mstack-protector-guard-offset=0

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a1213fa7432778b71a1c0166bf56660a3aab030


Here are discussions on the start of riscv support:

https://lore.kernel.org/lkml/CAJF2gTTr_ENhGRmjqNbGBhEc8y4D3YSqAResvwHuB1ykemKTUw@mail.gmail.com/

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