diff options
| author | Brian Geffon <bgeffon@google.com> | 2020-05-14 03:50:44 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-05-14 20:00:35 +0300 |
| commit | d1564926066115fb47ca06b2b9d23ed506ca9608 (patch) | |
| tree | 3f735c317ae9dc46ee144abae0d0bf80baf4e687 /ipc | |
| parent | 475f4dfc021c5fde69f3b7d3287bde0a50477b05 (diff) | |
| download | linux-d1564926066115fb47ca06b2b9d23ed506ca9608.tar.xz | |
userfaultfd: fix remap event with MREMAP_DONTUNMAP
A user is not required to set a new address when using MREMAP_DONTUNMAP
as it can be used without MREMAP_FIXED. When doing so the remap event
will use new_addr which may not have been set and we didn't propagate it
back other then in the return value of remap_to.
Because ret is always the new address it's probably more correct to use
it rather than new_addr on the remap_event_complete call, and it
resolves this bug.
Fixes: e346b3813067d4b ("mm/mremap: add MREMAP_DONTUNMAP to mremap()")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Brian Geffon <bgeffon@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: "Michael S . Tsirkin" <mst@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Sonny Rao <sonnyrao@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Link: http://lkml.kernel.org/r/20200506172158.218366-1-bgeffon@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions