add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/arch/arm64/mm/mmap.c
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@@ -1,19 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Based on arch/arm/mm/mmap.c
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  *
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  * Copyright (C) 2012 ARM Ltd.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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 #include <linux/elf.h>
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@@ -30,82 +19,6 @@
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 #include <linux/random.h>
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 #include <asm/cputype.h>
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-
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-/*
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- * Leave enough space between the mmap area and the stack to honour ulimit in
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- * the face of randomisation.
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- */
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-#define MIN_GAP (SZ_128M)
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-#define MAX_GAP	(STACK_TOP/6*5)
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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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-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 (test_thread_flag(TIF_32BIT))
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-		rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1);
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-	else
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-#endif
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-		rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1);
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-	return rnd << PAGE_SHIFT;
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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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- * This function, called very early during the creation of a new process VM
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- * image, sets up which VM layout function to use:
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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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-	/*
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-	 * Fall back to the standard layout if the personality bit is set, or
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-	 * if the expected stack growth is unlimited:
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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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  * You really shouldn't be using read() or write() on /dev/mem.  This might go