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binder: create node flag to request sender's security context

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To allow servers to verify client identity, allow a node
flag to be set that causes the sender's security context
to be delivered with the transaction. The BR_TRANSACTION
command is extended in BR_TRANSACTION_SEC_CTX to
contain a pointer to the security context string.

Signed-off-by: Todd Kjos <tkjos@google.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2019-01-14 09:10:21 -08:00 • committed by Greg Kroah-Hartman
parent 8fdf906265
commit ec74136ded
2 changed files with 102 additions and 23 deletions
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19
include/uapi/linux/android/binder.h
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@ -41,6 +41,14 @@ enum {
enum {
FLAT_BINDER_FLAG_PRIORITY_MASK = 0xff,
FLAT_BINDER_FLAG_ACCEPTS_FDS = 0x100,
/**
* @FLAT_BINDER_FLAG_TXN_SECURITY_CTX: request security contexts
*
* Only when set, causes senders to include their security
* context
*/
FLAT_BINDER_FLAG_TXN_SECURITY_CTX = 0x1000,
};
#ifdef BINDER_IPC_32BIT
@ -218,6 +226,7 @@ struct binder_node_info_for_ref {
#define BINDER_VERSION _IOWR('b', 9, struct binder_version)
#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)
/*
* NOTE: Two special error codes you should check for when calling
@ -276,6 +285,11 @@ struct binder_transaction_data {
} data;
};
struct binder_transaction_data_secctx {
struct binder_transaction_data transaction_data;
binder_uintptr_t secctx;
};
struct binder_transaction_data_sg {
struct binder_transaction_data transaction_data;
binder_size_t buffers_size;
@ -311,6 +325,11 @@ enum binder_driver_return_protocol {
BR_OK = _IO('r', 1),
/* No parameters! */
BR_TRANSACTION_SEC_CTX = _IOR('r', 2,
struct binder_transaction_data_secctx),
/*
* binder_transaction_data_secctx: the received command.
*/
BR_TRANSACTION = _IOR('r', 2, struct binder_transaction_data),
BR_REPLY = _IOR('r', 3, struct binder_transaction_data),
/*