x86/fpu: copyout_from_xsaves & copyin_to_xsaves fixes
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- v1 Latest2 patches 5 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | x86/fpu: move copyout_from_xsaves bounds check before the copyarch/ | +3 | 2 replies | |
| 2/2 | x86/fpu: copy MXCSR & MXCSR_FLAGS with SSE/YMM statearch/ | +38 | 5 replies |
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Cover letter [PATCH 0/2] x86/fpu: copyout_from_xsaves & copyin_to_xsaves fixes
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.