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Kernel: Switch to eagerly restoring x86 FPU state on context switch

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Lazy FPU restore is well known to be vulnerable to timing attacks,
and eager restore is a lot simpler anyway, so let's just do it eagerly.
This commit is contained in:
Andreas Kling 2020-01-01 16:49:08 +01:00
parent 9c0836ce97
commit fd740829d1
5 changed files with 15 additions and 39 deletions
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3
Kernel/Thread.h
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@ -329,8 +329,6 @@ public:
bool has_signal_handler(u8 signal) const;
FPUState& fpu_state() { return *m_fpu_state; }
bool has_used_fpu() const { return m_has_used_fpu; }
void set_has_used_fpu(bool b) { m_has_used_fpu = b; }
void set_default_signal_dispositions();
void push_value_on_stack(u32);
@ -457,7 +455,6 @@ private:
u32 m_priority { THREAD_PRIORITY_NORMAL };
u32 m_extra_priority { 0 };
u32 m_priority_boost { 0 };
bool m_has_used_fpu { false };
bool m_dump_backtrace_on_finalization { false };
bool m_should_die { false };