summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorDave Martin <Dave.Martin@arm.com>2017-01-05 16:50:57 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2017-01-20 14:55:19 +1100
commitb34ca60148c53971d373643195cc5c4d5d20be78 (patch)
tree434266b9f31e68d97566b46a3c777ae2dab3f579
parent99dfe80a2a246c600440a815741fd2e74a8b4977 (diff)
downloadlinux-b34ca60148c53971d373643195cc5c4d5d20be78.tar.bz2
powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write
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") Cc: stable@vger.kernel.org # v4.8+ Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
-rw-r--r--arch/powerpc/kernel/ptrace.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 10543eb1f8f3..925a4ef90559 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -1026,6 +1026,10 @@ static int tm_cfpr_set(struct task_struct *target,
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_struct *target,
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)