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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/arch/mips/mm/mmap.c
..
..
@@ -20,43 +20,6 @@
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 unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */
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 EXPORT_SYMBOL(shm_align_mask);
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-/* gap between mmap and stack */
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-#define MIN_GAP		(128*1024*1024UL)
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-#define MAX_GAP		((TASK_SIZE)/6*5)
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-#define STACK_RND_MASK	(0x7ff >> (PAGE_SHIFT - 12))
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-
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-static int mmap_is_legacy(struct rlimit *rlim_stack)
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-{
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-	if (current->personality & ADDR_COMPAT_LAYOUT)
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-		return 1;
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-
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-	if (rlim_stack->rlim_cur == RLIM_INFINITY)
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-		return 1;
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-
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-	return sysctl_legacy_va_layout;
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-}
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-
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-static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
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-{
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-	unsigned long gap = rlim_stack->rlim_cur;
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-	unsigned long pad = stack_guard_gap;
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-
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-	/* Account for stack randomization if necessary */
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-	if (current->flags & PF_RANDOMIZE)
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-		pad += (STACK_RND_MASK << PAGE_SHIFT);
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-
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-	/* Values close to RLIM_INFINITY can overflow. */
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-	if (gap + pad > gap)
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-		gap += pad;
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-
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-	if (gap < MIN_GAP)
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-		gap = MIN_GAP;
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-	else if (gap > MAX_GAP)
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-		gap = MAX_GAP;
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-
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-	return PAGE_ALIGN(TASK_SIZE - gap - rnd);
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-}
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-
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 #define COLOUR_ALIGN(addr, pgoff)				\
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 	((((addr) + shm_align_mask) & ~shm_align_mask) +	\
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 	 (((pgoff) << PAGE_SHIFT) & shm_align_mask))
..
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@@ -154,69 +117,12 @@
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 			addr0, len, pgoff, flags, DOWN);
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 }
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-unsigned long arch_mmap_rnd(void)
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-{
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-	unsigned long rnd;
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-
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-#ifdef CONFIG_COMPAT
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-	if (TASK_IS_32BIT_ADDR)
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-		rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1);
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-	else
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-#endif /* CONFIG_COMPAT */
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-		rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1);
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-
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-	return rnd << PAGE_SHIFT;
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-}
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-
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-void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
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-{
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-	unsigned long random_factor = 0UL;
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-
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-	if (current->flags & PF_RANDOMIZE)
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-		random_factor = arch_mmap_rnd();
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-
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-	if (mmap_is_legacy(rlim_stack)) {
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-		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
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-		mm->get_unmapped_area = arch_get_unmapped_area;
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-	} else {
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-		mm->mmap_base = mmap_base(random_factor, rlim_stack);
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-		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
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-	}
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-}
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-
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-static inline unsigned long brk_rnd(void)
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-{
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-	unsigned long rnd = get_random_long();
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-
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-	rnd = rnd << PAGE_SHIFT;
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-	/* 8MB for 32bit, 256MB for 64bit */
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-	if (TASK_IS_32BIT_ADDR)
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-		rnd = rnd & 0x7ffffful;
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-	else
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-		rnd = rnd & 0xffffffful;
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-
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-	return rnd;
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-}
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-
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-unsigned long arch_randomize_brk(struct mm_struct *mm)
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-{
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-	unsigned long base = mm->brk;
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-	unsigned long ret;
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-
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-	ret = PAGE_ALIGN(base + brk_rnd());
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-
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-	if (ret < mm->brk)
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-		return mm->brk;
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-
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-	return ret;
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-}
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-
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-int __virt_addr_valid(const volatile void *kaddr)
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+bool __virt_addr_valid(const volatile void *kaddr)
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 {
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 	unsigned long vaddr = (unsigned long)kaddr;
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 	if ((vaddr < PAGE_OFFSET) || (vaddr >= MAP_BASE))
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-		return 0;
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+		return false;
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 	return pfn_valid(PFN_DOWN(virt_to_phys(kaddr)));
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 }