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-rw-r--r--arch/powerpc/kernel/signal_32.c9
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(&regs->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);
}