[PATCH] mm: ensure get_unmapped_area() returns higher address than mmap_min_addr

[Akira Takeuchi]

commit 2afc745f3e3079ab16c826be4860da2529054dd2 upstream.

This patch fixes the problem that get_unmapped_area() can return illegal
address and result in failing mmap(2) etc.

In case that the address higher than PAGE_SIZE is set to
/proc/sys/vm/mmap_min_addr, the address lower than mmap_min_addr can be
returned by get_unmapped_area(), even if you do not pass any virtual
address hint (i.e.  the second argument).

This is because the current get_unmapped_area() code does not take into
account mmap_min_addr.

This leads to two actual problems as follows:

1. mmap(2) can fail with EPERM on the process without CAP_SYS_RAWIO,
   although any illegal parameter is not passed.

2. The bottom-up search path after the top-down search might not work in
   arch_get_unmapped_area_topdown().

Note: The first and third chunk of my patch, which changes "len" check,
are for more precise check using mmap_min_addr, and not for solving the
above problem.

[How to reproduce]

	--- test.c -------------------------------------------------
	#include <stdio.h>
	#include <unistd.h>
	#include <sys/mman.h>
	#include <sys/errno.h>

	int main(int argc, char *argv[])
	{
		void *ret = NULL, *last_map;
		size_t pagesize = sysconf(_SC_PAGESIZE);

		do {
			last_map = ret;
			ret = mmap(0, pagesize, PROT_NONE,
				MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
	//		printf("ret=%p\n", ret);
		} while (ret != MAP_FAILED);

		if (errno != ENOMEM) {
			printf("ERR: unexpected errno: %d (last map=%p)\n",
			errno, last_map);
		}

		return 0;
	}
	---------------------------------------------------------------

	$ gcc -m32 -o test test.c
	$ sudo sysctl -w vm.mmap_min_addr=65536
	vm.mmap_min_addr = 65536
	$ ./test  (run as non-priviledge user)
	ERR: unexpected errno: 1 (last map=0x10000)

Signed-off-by: Akira Takeuchi <takeuchi.akr@xxxxxxxxxxxxxxxx>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@xxxxxxxxxxxxxxxx>
Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
[bwh: Backported to 3.2:
 As we do not have vm_unmapped_area(), make arch_get_unmapped_area_topdown()
 calculate the lower limit for the new area's end address and then compare
 addresses with this instead of with len.  In the process, fix an off-by-one
 error which could result in returning 0 if mm->mmap_base == len.]
Signed-off-by: Akira Takeuchi <takeuchi.akr@xxxxxxxxxxxxxxxx>
[akira: Backported to 3.5:
 Based on Ben's backport for 3.2-stable kernel. ]
---
 mm/mmap.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 7e24763..529f72c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1443,7 +1443,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	struct vm_area_struct *vma;
 	unsigned long start_addr;
 
-	if (len > TASK_SIZE)
+	if (len > TASK_SIZE - mmap_min_addr)
 		return -ENOMEM;
 
 	if (flags & MAP_FIXED)
@@ -1452,7 +1452,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	if (addr) {
 		addr = PAGE_ALIGN(addr);
 		vma = find_vma(mm, addr);
-		if (TASK_SIZE - len >= addr &&
+		if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
 		    (!vma || addr + len <= vma->vm_start))
 			return addr;
 	}
@@ -1515,9 +1515,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	struct vm_area_struct *vma;
 	struct mm_struct *mm = current->mm;
 	unsigned long addr = addr0, start_addr;
+	unsigned long low_limit = max(PAGE_SIZE, mmap_min_addr);
 
 	/* requested length too big for entire address space */
-	if (len > TASK_SIZE)
+	if (len > TASK_SIZE - mmap_min_addr)
 		return -ENOMEM;
 
 	if (flags & MAP_FIXED)
@@ -1527,7 +1528,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	if (addr) {
 		addr = PAGE_ALIGN(addr);
 		vma = find_vma(mm, addr);
-		if (TASK_SIZE - len >= addr &&
+		if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
 				(!vma || addr + len <= vma->vm_start))
 			return addr;
 	}
@@ -1542,7 +1543,7 @@ try_again:
 	/* either no address requested or can't fit in requested address hole */
 	start_addr = addr = mm->free_area_cache;
 
-	if (addr < len)
+	if (addr < low_limit + len)
 		goto fail;
 
 	addr -= len;
@@ -1563,7 +1564,7 @@ try_again:
 
 		/* try just below the current vma->vm_start */
 		addr = vma->vm_start-len;
-	} while (len < vma->vm_start);
+	} while (vma->vm_start >= low_limit + len);
 
 fail:
 	/*
-- 
1.7.0.4

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