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riscv: process: fix kernel info leakage
[ Upstream commit6510c78490
] 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:7db91e57a0
("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.org Reviewed-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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -104,6 +104,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
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{
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struct pt_regs *childregs = task_pt_regs(p);
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memset(&p->thread.s, 0, sizeof(p->thread.s));
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/* p->thread holds context to be restored by __switch_to() */
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if (unlikely(p->flags & PF_KTHREAD)) {
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/* Kernel thread */
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