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authorDave Martin <Dave.Martin@arm.com>2017-01-05 16:50:57 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2017-01-20 14:54:43 +1100
commit99dfe80a2a246c600440a815741fd2e74a8b4977 (patch)
treed63db8f9b737a2a2cac0e70a030dbfb5cc3fc007
parent27593d72c4ad451ed13af35354b941bcd0abcec6 (diff)
downloadlinux-99dfe80a2a246c600440a815741fd2e74a8b4977.tar.bz2
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>
-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 e4744ff38a17..10543eb1f8f3 100644
--- 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)