x86: Increase MIN_GAP to include randomized stack (80938332) · Commits · 戴 / test

Currently we are not including randomized stack size when calculating mmap_base address in arch_pick_mmap_layout for topdown case. This might cause that mmap_base starts in the stack reserved area because stack is randomized by 1GB for 64b (8MB for 32b) and the minimum gap is 128MB. If the stack really grows down to mmap_base then we can get silent mmap region overwrite by the stack values. Let's include maximum stack randomization size into MIN_GAP which is used as the low bound for the gap in mmap. Signed-off-by:

Michal Hocko <mhocko@suse.cz> LKML-Reference: <1252400515-6866-1-git-send-email-mhocko@suse.cz> Acked-by:

Jiri Kosina <jkosina@suse.cz> Signed-off-by:

H. Peter Anvin <hpa@zytor.com> Cc: Stable Team <stable@kernel.org>

arch/x86/include/asm/elf.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -299,6 +299,8 @@ do { \

		#ifdef CONFIG_X86_32

		#define STACK_RND_MASK (0x7ff)

		#define VDSO_HIGH_BASE (__fix_to_virt(FIX_VDSO))

		#define ARCH_DLINFO ARCH_DLINFO_IA32(vdso_enabled)

arch/x86/mm/mmap.c

+15 −2

Original line number	Diff line number	Diff line
		@@ -29,13 +29,26 @@
		#include <linux/random.h>
		#include <linux/limits.h>
		#include <linux/sched.h>
		#include <asm/elf.h>

		static unsigned int stack_maxrandom_size(void)
		{
		unsigned int max = 0;
		if ((current->flags & PF_RANDOMIZE) &&
		!(current->personality & ADDR_NO_RANDOMIZE)) {
		max = ((-1U) & STACK_RND_MASK) << PAGE_SHIFT;
		}

		return max;
		}


		/*
		* Top of mmap area (just below the process stack).
		*
		* Leave an at least ~128 MB hole.
		* Leave an at least ~128 MB hole with possible stack randomization.
		*/
		#define MIN_GAP (12810241024)
		#define MIN_GAP (12810241024UL + stack_maxrandom_size())
		#define MAX_GAP (TASK_SIZE/6*5)

		/*

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