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| author | Kees Cook <keescook@chromium.org> | 2016-08-02 14:04:54 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2018-11-20 18:05:40 +0000 |
| commit | 403935326e58c6dd72fddc3a3850aa9d037ad598 (patch) | |
| tree | 4833c2eeec8f48b2f23586724c59a22be92b5215 /mm | |
| parent | c3c98dfdf85843f97e6290fd7758d27581769d88 (diff) | |
| download | linux-stable-403935326e58c6dd72fddc3a3850aa9d037ad598.tar.gz linux-stable-403935326e58c6dd72fddc3a3850aa9d037ad598.tar.bz2 linux-stable-403935326e58c6dd72fddc3a3850aa9d037ad598.zip | |
mm: refuse wrapped vm_brk requests
commit ba093a6d9397da8eafcfbaa7d95bd34255da39a0 upstream.
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/1468014494-25291-3-git-send-email-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Hector Marco-Gisbert <hecmargi@upv.es>
Cc: Ismael Ripoll Ripoll <iripoll@upv.es>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Chen Gang <gang.chen.5i5j@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmap.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 9b7beabd9ccc..4688ec0b2c76 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2751,16 +2751,18 @@ 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 unsigned long do_brk(unsigned long addr, unsigned long len) +static unsigned long 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 addr; |