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powerpc fixes for 4.13 #7

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A bug in the VSX register saving that could cause userspace FP/VMX register
 corruption. Never seen to happen (that we know of), was found by code
 inspection, but still tagged for stable given the consequences.
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Merge tag 'powerpc-4.13-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "A bug in the VSX register saving that could cause userspace FP/VMX
  register corruption.

  Never seen to happen (that we know of), was found by code inspection,
  but still tagged for stable given the consequences"

* tag 'powerpc-4.13-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc: Fix VSX enabling/flushing to also test MSR_FP and MSR_VEC
This commit is contained in:
Linus Torvalds 2017-08-18 11:11:03 -07:00
commit 039a8e3847
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/kernel/process.c
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@ -362,7 +362,8 @@ void enable_kernel_vsx(void)
cpumsr = msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX);
if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) {
if (current->thread.regs &&
(current->thread.regs->msr & (MSR_VSX|MSR_VEC|MSR_FP))) {
check_if_tm_restore_required(current);
/*
* If a thread has already been reclaimed then the
@ -386,7 +387,7 @@ void flush_vsx_to_thread(struct task_struct *tsk)
{
if (tsk->thread.regs) {
preempt_disable();
if (tsk->thread.regs->msr & MSR_VSX) {
if (tsk->thread.regs->msr & (MSR_VSX|MSR_VEC|MSR_FP)) {
BUG_ON(tsk != current);
giveup_vsx(tsk);
}