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BACKPORT: FROMGIT: binder: BINDER_FREEZE ioctl

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Frozen tasks can't process binder transactions, so a way is required to
inform transmitting ends of communication failures due to the frozen
state of their receiving counterparts. Additionally, races are possible
between transitions to frozen state and binder transactions enqueued to
a specific process.

Implement BINDER_FREEZE ioctl for user space to inform the binder driver
about the intention to freeze or unfreeze a process. When the ioctl is
called, block the caller until any pending binder transactions toward
the target process are flushed. Return an error to transactions to
processes marked as frozen.

Bug: 180989544
(cherry picked from commit 15949c3cdd97bccdcd45c0c0f6c31058520b6494
 git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-testing)
Co-developed-by: Todd Kjos <tkjos@google.com>
Acked-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Marco Ballesio <balejs@google.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Li Li <dualli@google.com>
Link: https://lore.kernel.org/r/20210316011630.1121213-2-dualli@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: Ia1b5951cd99eeb98b59e06c3e27d59062dc725f6
This commit is contained in:
Marco Ballesio 2021-03-09 18:18:56 -08:00 • committed by Todd Kjos
commit 445008273d
3 changed files with 154 additions and 10 deletions
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13
include/uapi/linux/android/binder.h
View file

@ -265,6 +265,12 @@ struct binder_node_info_for_ref {
__u32 reserved3;
};
struct binder_freeze_info {
__u32 pid;
__u32 enable;
__u32 timeout_ms;
};
#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, __s64)
#define BINDER_SET_MAX_THREADS _IOW('b', 5, __u32)
@ -275,6 +281,7 @@ struct binder_node_info_for_ref {
#define BINDER_GET_NODE_DEBUG_INFO _IOWR('b', 11, struct binder_node_debug_info)
#define BINDER_GET_NODE_INFO_FOR_REF _IOWR('b', 12, struct binder_node_info_for_ref)
#define BINDER_SET_CONTEXT_MGR_EXT _IOW('b', 13, struct flat_binder_object)
#define BINDER_FREEZE _IOW('b', 14, struct binder_freeze_info)
/*
* NOTE: Two special error codes you should check for when calling
@ -456,6 +463,12 @@ enum binder_driver_return_protocol {
* The last transaction (either a bcTRANSACTION or
* a bcATTEMPT_ACQUIRE) failed (e.g. out of memory). No parameters.
*/
BR_FROZEN_REPLY = _IO('r', 18),
/*
* The target of the last transaction (either a bcTRANSACTION or
* a bcATTEMPT_ACQUIRE) is frozen. No parameters.
*/
};
enum binder_driver_command_protocol {