Messages in this thread | | | From | riel@redhat ... | Subject | [PATCH 0/2] x86/fpu: copyout_from_xsaves & copyin_to_xsaves fixes | Date | Wed, 25 Jan 2017 20:57:57 -0500 |
| |
There are two issues with copyout_from_xsaves and copyin_to_xsaves.
The first is a simple bounds checking issue, where the code could potentially clobber memory outside of a userspace buffer before it stops copying data.
The second is more subtle. SSE and YMM XRSTOR depend on two fields inside the legacy FP area. However, if xfeatures XFEATURE_MASK_FP is clear, those fields do not get copied around at all. Fix that.
Thanks to Dave Hansen for helping track down that second bug.
| |