جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: riscv: Fix register corruption from uninitialized cregs on error compat_riscv_gpr_set() calls cregs_to_regs() unconditionally, even when user_regset_copyin() fails. Since cregs is an uninitialized stack variable, a copyin failure causes uninitialized stack data to be written into the target task's pt_regs, corrupting its register state and potentially leaking kernel stack contents. compat_restore_sigcontext() has the same issue: it calls cregs_to_regs() even when __copy_from_user() fails, leading to the same corruption of the signal-returning task's register state on error. Only call cregs_to_regs() when the user copy succeeds.

• https://git.kernel.org/stable/c/f2d88b0d7aebfa4643fc58bbae57210c6daff9c6
• https://git.kernel.org/stable/c/66dedb6028c3df6c6a3372dd935b823917e150d5
• https://git.kernel.org/stable/c/2a7d1daf2674fe7d5b1cc99a4e3b5f0f72d5958f
• https://git.kernel.org/stable/c/0599aa23734c48de9bce36d043a9ec90c23945a1
• https://git.kernel.org/stable/c/9e020156833f1ad0d425a1e3d85b65639f1c1c50
• https://git.kernel.org/stable/c/6ebcbb53fc9bc30843054ed99fd60b8e542628f4