/* * This function, called very early during the creation of a new * process VM image, sets up which VM layout function to use: */ static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base, unsigned long random_factor, unsigned long task_size) { *legacy_base = mmap_legacy_base(random_factor, task_size); if (mmap_is_legacy()) *base = *legacy_base; else *base = mmap_base(random_factor, task_size); }
/* * This function, called very early during the creation of a new * process VM image, sets up which VM layout function to use: */ void arch_pick_mmap_layout(struct mm_struct *mm) { mm->mmap_legacy_base = mmap_legacy_base(); mm->mmap_base = mmap_upper_limit(); if (mmap_is_legacy()) { mm->mmap_base = mm->mmap_legacy_base; mm->get_unmapped_area = arch_get_unmapped_area; } else { mm->get_unmapped_area = arch_get_unmapped_area_topdown; } }
/* * This function, called very early during the creation of a new * process VM image, sets up which VM layout function to use: */ void arch_pick_mmap_layout(struct mm_struct *mm) { if (!(2 & exec_shield) && mmap_is_legacy()) { mm->mmap_base = mmap_legacy_base(); mm->get_unmapped_area = arch_get_unmapped_area; mm->unmap_area = arch_unmap_area; } else { mm->mmap_base = mmap_base(); mm->get_unmapped_area = arch_get_unmapped_area_topdown; if (!(current->personality & READ_IMPLIES_EXEC) && mmap_is_ia32()) mm->get_unmapped_exec_area = arch_get_unmapped_exec_area; mm->unmap_area = arch_unmap_area_topdown; } }
/* * This function, called very early during the creation of a new * process VM image, sets up which VM layout function to use: */ void arch_pick_mmap_layout(struct mm_struct *mm) { unsigned long random_factor = 0UL; if (current->flags & PF_RANDOMIZE) random_factor = arch_mmap_rnd(); mm->mmap_legacy_base = mmap_legacy_base(random_factor); if (mmap_is_legacy()) { mm->mmap_base = mm->mmap_legacy_base; mm->get_unmapped_area = arch_get_unmapped_area; } else { mm->mmap_base = mmap_base(random_factor); mm->get_unmapped_area = arch_get_unmapped_area_topdown; } }
/* * This function, called very early during the creation of a new * process VM image, sets up which VM layout function to use: */ void arch_pick_mmap_layout(struct mm_struct *mm) { if (mmap_is_legacy()) { mm->mmap_base = mmap_legacy_base(); mm->get_unmapped_area = arch_get_unmapped_area; mm->unmap_area = arch_unmap_area; } else { mm->mmap_base = mmap_base(); mm->get_unmapped_area = arch_get_unmapped_area_topdown; #ifdef CONFIG_X86_32 if (!(current->personality & READ_IMPLIES_EXEC) && !(__supported_pte_mask & _PAGE_NX) && mmap_is_ia32()) mm->get_unmapped_exec_area = arch_get_unmapped_exec_area; #endif mm->unmap_area = arch_unmap_area_topdown; } }