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| author | Todd Kjos <tkjos@google.com> | 2021-08-30 21:51:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-14 09:02:13 +0200 |
| commit | 5fdb55c1ac9585eb23bb2541d5819224429e103d (patch) | |
| tree | 1ce65a704c88f44dabcc6e58538d0d4fa3902efc /include | |
| parent | binder: fix freeze race (diff) | |
| download | linux-5fdb55c1ac9585eb23bb2541d5819224429e103d.tar.xz linux-5fdb55c1ac9585eb23bb2541d5819224429e103d.zip | |
binder: make sure fd closes complete
During BC_FREE_BUFFER processing, the BINDER_TYPE_FDA object
cleanup may close 1 or more fds. The close operations are
completed using the task work mechanism -- which means the thread
needs to return to userspace or the file object may never be
dereferenced -- which can lead to hung processes.
Force the binder thread back to userspace if an fd is closed during
BC_FREE_BUFFER handling.
Fixes: 80cd795630d6 ("binder: fix use-after-free due to ksys_close() during fdget()")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Martijn Coenen <maco@android.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Link: https://lore.kernel.org/r/20210830195146.587206-1-tkjos@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions