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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-08-18 11:11:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-08-18 11:11:03 -0700 |
| commit | 039a8e38473323ed9f6c4415b4c3a36777efac34 (patch) | |
| tree | 315d9235076a263249b8ee365b3eed51b13ab6b5 | |
| parent | 42833468027770b8b731e3d9620165873439d237 (diff) | |
| parent | 5a69aec945d27e78abac9fd032533d3aaebf7c1e (diff) | |
| download | lwn-039a8e38473323ed9f6c4415b4c3a36777efac34.tar.gz lwn-039a8e38473323ed9f6c4415b4c3a36777efac34.zip | |
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
| -rw-r--r-- | arch/powerpc/kernel/process.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index ec480966f9bf..1f0fd361e09b 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -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); } |