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9035cf9a97
A protection flag may not be valid across entire address space and hence arch_validate_prot() might need the address a protection bit is being set on to ensure it is a valid protection flag. For example, sparc processors support memory corruption detection (as part of ADI feature) flag on memory addresses mapped on to physical RAM but not on PFN mapped pages or addresses mapped on to devices. This patch adds address to the parameters being passed to arch_validate_prot() so protection bits can be validated in the relevant context. Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com> Cc: Khalid Aziz <khalid@gonehiking.org> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_POWERPC_MMAN_H
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#define _ASM_POWERPC_MMAN_H
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#include <uapi/asm/mman.h>
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#ifdef CONFIG_PPC64
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#include <asm/cputable.h>
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#include <linux/mm.h>
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#include <linux/pkeys.h>
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#include <asm/cpu_has_feature.h>
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/*
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* This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
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* here. How important is the optimization?
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*/
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static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
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unsigned long pkey)
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{
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#ifdef CONFIG_PPC_MEM_KEYS
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return (((prot & PROT_SAO) ? VM_SAO : 0) | pkey_to_vmflag_bits(pkey));
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#else
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return ((prot & PROT_SAO) ? VM_SAO : 0);
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#endif
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}
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#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
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static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
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{
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#ifdef CONFIG_PPC_MEM_KEYS
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return (vm_flags & VM_SAO) ?
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__pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
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__pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
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#else
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return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
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#endif
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}
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#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
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static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
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{
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if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
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return false;
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if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
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return false;
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return true;
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}
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#define arch_validate_prot arch_validate_prot
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#endif /* CONFIG_PPC64 */
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#endif /* _ASM_POWERPC_MMAN_H */
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