diff options
| -rw-r--r-- | arch/powerpc/kernel/signal_32.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index c9d02751127..d3f0b6d452f 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -219,6 +219,15 @@ static inline int get_old_sigaction(struct k_sigaction *new_ka, static inline int save_general_regs(struct pt_regs *regs, struct mcontext __user *frame) { + if (!FULL_REGS(regs)) { + /* Zero out the unsaved GPRs to avoid information + leak, and set TIF_SAVE_NVGPRS to ensure that the + registers do actually get saved later. */ + memset(®s->gpr[14], 0, 18 * sizeof(unsigned long)); + current_thread_info()->nvgprs_frame = &frame->mc_gregs; + set_thread_flag(TIF_SAVE_NVGPRS); + } + return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); } |