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: 7db91e57a0ac ("RISC-V: Task implementation")
Signed-off-by: Jisheng Zhang <[email protected]>
Tested-by: Guo Ren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Guo Ren <[email protected]>
Link: https://lore.kernel.org/r/CAJF2gTSdVyAaM12T%[email protected]/
Signed-off-by: Palmer Dabbelt <[email protected]>

0 files changed, 0 insertions, 0 deletions