riscv: process: fix kernel info leakage
thread_struct's s[12] may contain random kernel memory content, which may be finally leaked to userspace. This is a security hole. Fix it by clearing the s[12] array in thread_struct when fork. As for kthread case, it's better to clear the s[12] array as well. Fixes: 7db91e57 ("RISC-V: Task implementation") Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Tested-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/r/20221029113450.4027-1-jszhang@kernel.orgReviewed-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/r/CAJF2gTSdVyAaM12T%2B7kXAdRPGS4VyuO08X1c7paE-n4Fr8OtRA@mail.gmail.com/Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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