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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/arm/mm/mmap.c
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@@ -17,43 +17,6 @@
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 	((((addr)+SHMLBA-1)&~(SHMLBA-1)) +	\
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 	 (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))
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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		((STACK_TOP)/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(STACK_TOP - gap - rnd);
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-}
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-
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 /*
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  * We need to ensure that shared mappings are correctly aligned to
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  * avoid aliasing issues with VIPT caches.  We need to ensure that
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@@ -179,31 +142,6 @@
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 	}
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 	return addr;
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-}
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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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-	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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 /*