371071131c
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
50 lines
961 B
C
50 lines
961 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PKEYS_H
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#define _LINUX_PKEYS_H
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#include <linux/mm.h>
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#ifdef CONFIG_ARCH_HAS_PKEYS
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#include <asm/pkeys.h>
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#else /* ! CONFIG_ARCH_HAS_PKEYS */
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#define arch_max_pkey() (1)
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#define execute_only_pkey(mm) (0)
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#define arch_override_mprotect_pkey(vma, prot, pkey) (0)
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#define PKEY_DEDICATED_EXECUTE_ONLY 0
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#define ARCH_VM_PKEY_FLAGS 0
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static inline int vma_pkey(struct vm_area_struct *vma)
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{
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return 0;
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}
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static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
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{
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return (pkey == 0);
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}
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static inline int mm_pkey_alloc(struct mm_struct *mm)
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{
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return -1;
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}
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static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
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{
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return -EINVAL;
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}
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static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
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unsigned long init_val)
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{
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return 0;
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}
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static inline bool arch_pkeys_enabled(void)
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{
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return false;
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}
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#endif /* ! CONFIG_ARCH_HAS_PKEYS */
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#endif /* _LINUX_PKEYS_H */
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