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| author | Andrei Vagin <avagin@gmail.com> | 2021-03-30 21:40:07 -0700 |
|---|---|---|
| committer | Andrei Vagin <avagin@gmail.com> | 2021-04-01 13:28:15 -0700 |
| commit | eb9b8e53a3ef7bb96dcb59a0121fa9ed22f01bfd (patch) | |
| tree | d01a7b7aae854e5b2a89c156d809e1b6aafc4640 /pkg/sentry/arch | |
| parent | 6c10c772e46ffe8d27cffe77aed24f0d334d611c (diff) | |
platform/kvm/x86: restore mxcsr when switching from guest to sentry
Goruntime sets mxcsr once and never changes it.
Reported-by: syzbot+ec55cea6e57ec083b7a6@syzkaller.appspotmail.com
Fixes: #5754
Diffstat (limited to 'pkg/sentry/arch')
| -rw-r--r-- | pkg/sentry/arch/fpu/fpu_amd64.go | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/pkg/sentry/arch/fpu/fpu_amd64.go b/pkg/sentry/arch/fpu/fpu_amd64.go index 1e9625bee..f0ba26736 100644 --- a/pkg/sentry/arch/fpu/fpu_amd64.go +++ b/pkg/sentry/arch/fpu/fpu_amd64.go @@ -219,6 +219,11 @@ func (s *State) PtraceSetXstateRegs(src io.Reader, maxlen int, featureSet *cpuid return copy(*s, f), nil } +// SetMXCSR sets the MXCSR control/status register in the state. +func (s *State) SetMXCSR(mxcsr uint32) { + hostarch.ByteOrder.PutUint32((*s)[mxcsrOffset:], mxcsr) +} + // BytePointer returns a pointer to the first byte of the state. // //go:nosplit |