Commit 99dfe80a authored by Dave Martin's avatar Dave Martin Committed by Michael Ellerman

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: c6e6771b ("powerpc: Introduce VSX thread_struct and CONFIG_VSX")
Cc: stable@vger.kernel.org # v2.6.27+
Signed-off-by: default avatarDave Martin <Dave.Martin@arm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 27593d72
...@@ -463,6 +463,10 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset, ...@@ -463,6 +463,10 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
flush_fp_to_thread(target); 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 */ /* copy to local buffer then write that out */
i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1); i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
if (i) if (i)
...@@ -672,6 +676,9 @@ static int vsr_set(struct task_struct *target, const struct user_regset *regset, ...@@ -672,6 +676,9 @@ static int vsr_set(struct task_struct *target, const struct user_regset *regset,
flush_altivec_to_thread(target); flush_altivec_to_thread(target);
flush_vsx_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, ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
buf, 0, 32 * sizeof(double)); buf, 0, 32 * sizeof(double));
if (!ret) if (!ret)
......
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