Todd Kjos d5b0473707 binder: make sure fd closes complete ... commit 5fdb55c1ac upstream. 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: 80cd795630 ("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>		2021-09-30 10:10:59 +02:00
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binder.c	binder: make sure fd closes complete	2021-09-30 10:10:59 +02:00
binder_alloc.c	binder: add flag to clear buffer on txn complete	2020-12-30 11:54:09 +01:00
binder_alloc.h	binder: add flag to clear buffer on txn complete	2020-12-30 11:54:09 +01:00
binder_alloc_selftest.c	binder: print warnings when detecting oneway spamming.	2020-09-03 18:24:41 +02:00
binder_internal.h	binder: prevent UAF for binderfs devices II	2020-03-03 19:58:37 +01:00
binder_trace.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282	2019-06-05 17:36:37 +02:00
binderfs.c	binderfs: make symbol 'binderfs_fs_parameters' static	2020-09-03 18:24:39 +02:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00