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mm: refuse wrapped vm_brk requests

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The vm_brk() alignment calculations should refuse to overflow.  The ELF
loader depending on this, but it has been fixed now.  No other unsafe
callers have been found.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>
Reported-by: Hector Marco-Gisbert <[email protected]>
Cc: Ismael Ripoll Ripoll <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Chen Gang <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kees Cook 2016-08-02 14:04:54 -07:00 • committed by Linus Torvalds
commit ba093a6d93
1 changed files with 5 additions and 3 deletions
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8
mm/mmap.c
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@ -2653,16 +2653,18 @@ 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 int do_brk(unsigned long addr, unsigned long len)
static int do_brk(unsigned long addr, unsigned long request)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev;
unsigned long flags;
unsigned long flags, len;
struct rb_node **rb_link, *rb_parent;
pgoff_t pgoff = addr >> PAGE_SHIFT;
int error;
len = PAGE_ALIGN(len);
len = PAGE_ALIGN(request);
if (len < request)
return -ENOMEM;
if (!len)
return 0;