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x86/fpu: Use copy_xstate_to_uabi_buf() in xfpregs_get()

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Use the new functionality of copy_xstate_to_uabi_buf() to retrieve the
FX state when XSAVE* is in use. This avoids overwriting the FPU state
buffer with fpstate_sanitize_xstate() which is error prone and duplicated
code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121452.901736860@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-23 14:01:43 +02:00 committed by Borislav Petkov
parent eb6f51723f
commit adc997b3d6
1 changed files with 8 additions and 3 deletions
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11
arch/x86/kernel/fpu/regset.c
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@ -33,13 +33,18 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
{
struct fpu *fpu = &target->thread.fpu;
if (!boot_cpu_has(X86_FEATURE_FXSR))
if (!cpu_feature_enabled(X86_FEATURE_FXSR))
return -ENODEV;
fpu__prepare_read(fpu);
fpstate_sanitize_xstate(fpu);
return membuf_write(&to, &fpu->state.fxsave, sizeof(struct fxregs_state));
if (!use_xsave()) {
return membuf_write(&to, &fpu->state.fxsave,
sizeof(fpu->state.fxsave));
}
copy_xstate_to_uabi_buf(to, &fpu->state.xsave, XSTATE_COPY_FX);
return 0;
}
int xfpregs_set(struct task_struct *target, const struct user_regset *regset,