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| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-06-23 14:02:11 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-06-23 19:15:16 +0200 |
| commit | 371071131cd1032c1e9172c51234a2a324841cab (patch) | |
| tree | 0ca7ca1065a411917f11a58ad791d6c94c2e635b /arch/x86/include/asm/pkeys.h | |
| parent | x86/cpu: Write the default PKRU value when enabling PKE (diff) | |
| download | wireguard-linux-371071131cd1032c1e9172c51234a2a324841cab.tar.xz wireguard-linux-371071131cd1032c1e9172c51234a2a324841cab.zip | |
x86/fpu: Use pkru_write_default() in copy_init_fpstate_to_fpregs()
There is no point in using copy_init_pkru_to_fpregs() which in turn calls
write_pkru(). write_pkru() tries to fiddle with the task's xstate buffer
for nothing because the XRSTOR[S](init_fpstate) just cleared the xfeature
flag in the xstate header which makes get_xsave_addr() fail.
It's a useless exercise anyway because the reinitialization activates the
FPU so before the task's xstate buffer can be used again a XRSTOR[S] must
happen which in turn dumps the PKRU value.
Get rid of the now unused copy_init_pkru_to_fpregs().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121455.732508792@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/pkeys.h')
| -rw-r--r-- | arch/x86/include/asm/pkeys.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pkeys.h b/arch/x86/include/asm/pkeys.h index 4128f647c755..5c7bcaa79623 100644 --- a/arch/x86/include/asm/pkeys.h +++ b/arch/x86/include/asm/pkeys.h @@ -124,7 +124,6 @@ extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey, unsigned long init_val); extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey, unsigned long init_val); -extern void copy_init_pkru_to_fpregs(void); static inline int vma_pkey(struct vm_area_struct *vma) { |