Linux-libre 4.7.1-gnupck-4.7.1-gnu

1 files changed, 35 insertions, 22 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 7328b7436..b7f391c8d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -55,10 +55,6 @@
 #define arch_mmap_check(addr, len, flags)	(0)
 #endif
 
-#ifndef arch_rebalance_pgtables
-#define arch_rebalance_pgtables(addr, len)		(addr)
-#endif
-
 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
 const int mmap_rnd_bits_min = CONFIG_ARCH_MMAP_RND_BITS_MIN;
 const int mmap_rnd_bits_max = CONFIG_ARCH_MMAP_RND_BITS_MAX;
@@ -70,7 +66,7 @@ const int mmap_rnd_compat_bits_max = CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX;
 int mmap_rnd_compat_bits __read_mostly = CONFIG_ARCH_MMAP_RND_COMPAT_BITS;
 #endif
 
-static bool ignore_rlimit_data = true;
+static bool ignore_rlimit_data;
 core_param(ignore_rlimit_data, ignore_rlimit_data, bool, 0644);
 
 static void unmap_region(struct mm_struct *mm,
@@ -172,7 +168,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
 	return next;
 }
 
-static unsigned long do_brk(unsigned long addr, unsigned long len);
+static int do_brk(unsigned long addr, unsigned long len);
 
 SYSCALL_DEFINE1(brk, unsigned long, brk)
 {
@@ -182,7 +178,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 	unsigned long min_brk;
 	bool populate;
 
-	down_write(&mm->mmap_sem);
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
 
 #ifdef CONFIG_COMPAT_BRK
 	/*
@@ -227,7 +224,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 		goto out;
 
 	/* Ok, looks good - let it rip. */
-	if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)
+	if (do_brk(oldbrk, newbrk-oldbrk) < 0)
 		goto out;
 
 set_brk:
@@ -1911,7 +1908,6 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
 	if (offset_in_page(addr))
 		return -EINVAL;
 
-	addr = arch_rebalance_pgtables(addr, len);
 	error = security_mmap_addr(addr);
 	return error ? error : addr;
 }
@@ -2498,7 +2494,9 @@ int vm_munmap(unsigned long start, size_t len)
 	int ret;
 	struct mm_struct *mm = current->mm;
 
-	down_write(&mm->mmap_sem);
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
+
 	ret = do_munmap(mm, start, len);
 	up_write(&mm->mmap_sem);
 	return ret;
@@ -2507,8 +2505,15 @@ EXPORT_SYMBOL(vm_munmap);
 
 SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
 {
+	int ret;
+	struct mm_struct *mm = current->mm;
+
 	profile_munmap(addr);
-	return vm_munmap(addr, len);
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
+	ret = do_munmap(mm, addr, len);
+	up_write(&mm->mmap_sem);
+	return ret;
 }
 
 
@@ -2540,7 +2545,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 	if (pgoff + (size >> PAGE_SHIFT) < pgoff)
 		return ret;
 
-	down_write(&mm->mmap_sem);
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
+
 	vma = find_vma(mm, start);
 
 	if (!vma || !(vma->vm_flags & VM_SHARED))
@@ -2635,7 +2642,7 @@ static inline void verify_mm_writelocked(struct mm_struct *mm)
  *  anonymous maps.  eventually we may be able to do some
  *  brk-specific accounting here.
  */
-static unsigned long do_brk(unsigned long addr, unsigned long len)
+static int do_brk(unsigned long addr, unsigned long len)
 {
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma, *prev;
@@ -2646,7 +2653,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
 
 	len = PAGE_ALIGN(len);
 	if (!len)
-		return addr;
+		return 0;
 
 	flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
 
@@ -2713,20 +2720,22 @@ out:
 	if (flags & VM_LOCKED)
 		mm->locked_vm += (len >> PAGE_SHIFT);
 	vma->vm_flags |= VM_SOFTDIRTY;
-	return addr;
+	return 0;
 }
 
-unsigned long vm_brk(unsigned long addr, unsigned long len)
+int vm_brk(unsigned long addr, unsigned long len)
 {
 	struct mm_struct *mm = current->mm;
-	unsigned long ret;
+	int ret;
 	bool populate;
 
-	down_write(&mm->mmap_sem);
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
+
 	ret = do_brk(addr, len);
 	populate = ((mm->def_flags & VM_LOCKED) != 0);
 	up_write(&mm->mmap_sem);
-	if (populate)
+	if (populate && !ret)
 		mm_populate(addr, len);
 	return ret;
 }
@@ -2908,13 +2917,17 @@ bool may_expand_vm(struct mm_struct *mm, vm_flags_t flags, unsigned long npages)
 
 	if (is_data_mapping(flags) &&
 	    mm->data_vm + npages > rlimit(RLIMIT_DATA) >> PAGE_SHIFT) {
-		if (ignore_rlimit_data)
-			pr_warn_once("%s (%d): VmData %lu exceed data ulimit %lu. Will be forbidden soon.\n",
+		/* Workaround for Valgrind */
+		if (rlimit(RLIMIT_DATA) == 0 &&
+		    mm->data_vm + npages <= rlimit_max(RLIMIT_DATA) >> PAGE_SHIFT)
+			return true;
+		if (!ignore_rlimit_data) {
+			pr_warn_once("%s (%d): VmData %lu exceed data ulimit %lu. Update limits or use boot option ignore_rlimit_data.\n",
 				     current->comm, current->pid,
 				     (mm->data_vm + npages) << PAGE_SHIFT,
 				     rlimit(RLIMIT_DATA));
-		else
 			return false;
+		}
 	}
 
 	return true;