4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dave Martin <dave.mar...@arm.com>
commit b34ca60148c53971d373643195cc5c4d5d20be78 upstream.
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the check pointed registers, the thread's old check pointed
registers are preserved.
Fixes: 9d3918f7c0e5 ("powerpc/ptrace: Enable support for NT_PPC_CVSX")
Fixes: 19cbcbf75a0c ("powerpc/ptrace: Enable support for NT_PPC_CFPR")
Signed-off-by: Dave Martin <dave.mar...@arm.com>
Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/powerpc/kernel/ptrace.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1026,6 +1026,10 @@ static int tm_cfpr_set(struct task_struc
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
+ for (i = 0; i < 32; i++)
+ buf[i] = target->thread.TS_CKFPR(i);
+ buf[32] = target->thread.ckfp_state.fpscr;
+
/* copy to local buffer then write that out */
i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
if (i)
@@ -1290,6 +1294,9 @@ static int tm_cvsx_set(struct task_struc
flush_altivec_to_thread(target);
flush_vsx_to_thread(target);
+ for (i = 0; i < 32 ; i++)
+ buf[i] = target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
+
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
buf, 0, 32 * sizeof(double));
if (!ret)
