powerpc/ptrace: Preserve previous fprs/vsrs on short regset write

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Fixes: c6e6771b87d4 ("powerpc: Introduce VSX thread_struct and CONFIG_VSX")
Cc: stable@vger.kernel.org # v2.6.27+
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index e4744ff..10543eb 100644 (file)
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -463,6 +463,10 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
 
        flush_fp_to_thread(target);
 
+       for (i = 0; i < 32 ; i++)
+               buf[i] = target->thread.TS_FPR(i);
+       buf[32] = target->thread.fp_state.fpscr;
+
        /* copy to local buffer then write that out */
        i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
        if (i)
@@ -672,6 +676,9 @@ static int vsr_set(struct task_struct *target, const struct user_regset *regset,
        flush_altivec_to_thread(target);
        flush_vsx_to_thread(target);
 
+       for (i = 0; i < 32 ; i++)
+               buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
+
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 buf, 0, 32 * sizeof(double));
        if (!ret)