]> git.baikalelectronics.ru Git - kernel.git/commit
mm/mmap.c: expand_downwards: don't require the gap if !vm_prev
authorOleg Nesterov <oleg@redhat.com>
Mon, 10 Jul 2017 22:49:54 +0000 (15:49 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 10 Jul 2017 23:32:33 +0000 (16:32 -0700)
commit9d307df9a669edc4262c03bdc5b402992a05e61b
tree99fd2fe16b0823ff35bf616f1f3dad661e21cec9
parent2f41577a2adb01f9b1b587b622ef8175959f2dbc
mm/mmap.c: expand_downwards: don't require the gap if !vm_prev

expand_stack(vma) fails if address < stack_guard_gap even if there is no
vma->vm_prev.  I don't think this makes sense, and we didn't do this
before the recent commit b6107de1ad62 ("mm: larger stack guard gap,
between vmas").

We do not need a gap in this case, any address is fine as long as
security_mmap_addr() doesn't object.

This also simplifies the code, we know that address >= prev->vm_end and
thus underflow is not possible.

Link: http://lkml.kernel.org/r/20170628175258.GA24881@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/mmap.c