Yisheng Xie 740a5759bf staging: android: ashmem: Fix possible deadlock in ashmem_ioctl ... ashmem_mutex may create a chain of dependencies like: CPU0 CPU1 mmap syscall ioctl syscall -> mmap_sem (acquired) -> ashmem_ioctl -> ashmem_mmap -> ashmem_mutex (acquired) -> ashmem_mutex (try to acquire) -> copy_from_user -> mmap_sem (try to acquire) There is a lock odering problem between mmap_sem and ashmem_mutex causing a lockdep splat[1] during a syzcaller test. This patch fixes the problem by move copy_from_user out of ashmem_mutex. [1] https://www.spinics.net/lists/kernel/msg2733200.html Fixes: ce8a3a9e76 (staging: android: ashmem: Fix a race condition in pin ioctls) Reported-by: syzbot+d7a918a7a8e1c952bc36@syzkaller.appspotmail.com Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-03-06 07:21:10 -08:00
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ion	staging: android: ion: Zero CMA allocated memory	2018-02-16 17:50:09 +01:00
uapi	staging: android: Remove redundant license text	2017-11-28 13:20:48 +01:00
ashmem.c	staging: android: ashmem: Fix possible deadlock in ashmem_ioctl	2018-03-06 07:21:10 -08:00
ashmem.h	staging: android: add SPDX identifiers to all android driver files	2017-11-28 13:20:47 +01:00
Kconfig
Makefile
TODO	staging: android: TODO: Removing an invalid issue	2017-10-03 18:36:57 +02:00