new file mode 100644
@@ -0,0 +1,93 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================================================
+Generic Netlink for the Android Binder Driver (Binder Genl)
+===========================================================
+
+The Generic Netlink subsystem in the Linux kernel provides a generic way for
+the Linux kernel to communicate to the user space applications via binder
+driver. It is used to report various kinds of binder transactions to user
+space administration process. The driver allows multiple binder devices and
+their corresponding binder contexts. Each context has an independent Generic
+Netlink for security reason. To prevent untrusted user applications from
+accessing the netlink data, the kernel driver uses unicast mode instead of
+multicast.
+
+Basically, the user space code uses the "set" command to request what kind
+of binder transactions reported by the kernel binder driver. The driver then
+uses "reply" command to acknowledge the request. The "set" command also
+registers the current user space process to receive the reports. When the
+user space process exits, the previous request will be reset to prevent any
+potential leaks.
+
+Currently the driver can report binder transactions that "failed" to reach
+the target process, or that are "delayed" due to the target process being
+frozen by cgroup freezer, or that are considered "spam" according to existing
+logic in binder_alloc.c.
+
+When the specified binder transactions happen, the driver uses the "report"
+command to send a generic netlink message to the registered process,
+containing the payload struct binder_report.
+
+More details about the flags, attributes and operations can be found at the
+the doc sections in Documentations/netlink/specs/binder_genl.yaml and the
+kernel-doc comments of the new source code in binder.{h|c}.
+
+Using Binder Genl
+-----------------
+
+The Binder Genl can be used in the same way as any other generic netlink
+drivers. Userspace application uses a raw netlink socket to send commands
+to and receive packets from the kernel driver.
+
+.. note::
+ If the userspace application that talks to the driver exits, the kernel
+ driver will automatically reset the configuration to the default and
+ stop sending more reports to prevent leaking memory.
+
+Usage example (user space pseudo code):
+
+::
+
+ // open netlink socket
+ int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
+
+ // bind netlink socket
+ bind(fd, struct socketaddr);
+
+ // get the family id of the binder genl
+ send(fd, CTRL_CMD_GETFAMILY, CTRL_ATTR_FAMILY_NAME, "binder");
+ void *data = recv(CTRL_CMD_NEWFAMILY);
+ __u16 id = nla(data)[CTRL_ATTR_FAMILY_ID];
+
+ // enable per-context binder report
+ send(fd, id, BINDER_GENL_CMD_SET, 0, BINDER_GENL_FLAG_FAILED |
+ BINDER_GENL_FLAG_DELAYED);
+
+ // confirm the per-context configuration
+ void *data = recv(fd, BINDER_GENL_CMD_REPLY);
+ __u32 pid = nla(data)[BINDER_GENL_ATTR_PID];
+ __u32 flags = nla(data)[BINDER_GENL_ATTR_FLAGS];
+
+ // set optional per-process report, overriding the per-context one
+ send(fd, id, BINDER_GENL_CMD_SET, getpid(),
+ BINDER_GENL_FLAG_SPAM | BINDER_REPORT_OVERRIDE);
+
+ // confirm the optional per-process configuration
+ void *data = recv(fd, BINDER_GENL_CMD_REPLY);
+ __u32 pid = nla(data)[BINDER_GENL_A_ATTR_PID];
+ __u32 flags = nla(data)[BINDER_GENL_A_ATTR_FLAGS];
+
+ // wait and read all binder reports
+ while (running) {
+ void *data = recv(fd, BINDER_GENL_CMD_REPORT);
+ struct binder_report report = nla(data)[BINDER_GENL_A_ATTR_REPORT];
+
+ // process struct binder_report
+ do_something(&report);
+ }
+
+ // clean up
+ send(fd, id, BINDER_GENL_CMD_SET, 0, 0);
+ send(fd, id, BINDER_GENL_CMD_SET, getpid(), 0);
+ close(fd);
@@ -79,6 +79,7 @@ configure specific aspects of kernel behavior to your liking.
aoe/index
auxdisplay/index
bcache
+ binder_genl
binderfs
binfmt-misc
blockdev/index
new file mode 100644
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+
+name: binder_genl
+protocol: genetlink
+
+doc: Netlink protocol to report binder transaction errors and warnings.
+
+definitions:
+ -
+ type: flags
+ name: flag
+ doc: |
+ Used with "set" and "reply" command below, defining what kind of binder
+ transactions reported to the user space administration process.
+ value-start: 0
+ entries: [ failed, delayed, spam, override ]
+
+attribute-sets:
+ -
+ name: attr
+ doc: The supported attributes of binder genl.
+ attributes:
+ -
+ name: pid
+ type: u32
+ doc: |
+ Used by "set" and "reply" command below, indicating the binder proc
+ or context to set the flags.
+ -
+ name: flags
+ type: u32
+ doc: |
+ Used by "set" and "reply" command below, indicating the flags to set.
+ -
+ name: report
+ type: binary
+ doc: Used by "report" command below, containing struct binder_report.
+
+operations:
+ list:
+ -
+ name: set
+ doc: |
+ Set flags from user space, requesting what kinds of binder
+ transactions to report.
+ attribute-set: attr
+
+ do:
+ request: ¶ms
+ attributes:
+ - pid
+ - flags
+ reply: *params
+ -
+ name: reply
+ doc: Acknowledge the above "set" request, echoing the same params.
+ -
+ name: report
+ doc: Send the requested binder transaction reports to user space.
@@ -4,6 +4,7 @@ menu "Android"
config ANDROID_BINDER_IPC
bool "Android Binder IPC Driver"
depends on MMU
+ depends on NET
default n
help
Binder is used in Android for both communication between processes,
@@ -2,5 +2,5 @@
ccflags-y += -I$(src) # needed for trace events
obj-$(CONFIG_ANDROID_BINDERFS) += binderfs.o
-obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o binder_alloc.o
+obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o binder_alloc.o binder_genl.o
obj-$(CONFIG_ANDROID_BINDER_IPC_SELFTEST) += binder_alloc_selftest.o
@@ -72,6 +72,7 @@
#include <linux/cacheflush.h>
+#include "binder_genl.h"
#include "binder_internal.h"
#include "binder_trace.h"
@@ -2984,6 +2985,131 @@ static void binder_set_txn_from_error(struct binder_transaction *t, int id,
binder_thread_dec_tmpref(from);
}
+/**
+ * binder_find_proc() - set binder report flags
+ * @pid: the target process
+ */
+static struct binder_proc *binder_find_proc(int pid)
+{
+ struct binder_proc *proc;
+
+ mutex_lock(&binder_procs_lock);
+ hlist_for_each_entry(proc, &binder_procs, proc_node) {
+ if (proc->pid == pid) {
+ mutex_unlock(&binder_procs_lock);
+ return proc;
+ }
+ }
+ mutex_unlock(&binder_procs_lock);
+
+ return NULL;
+}
+
+/**
+ * binder_genl_set_report() - set binder report flags
+ * @context: the binder context to set the flags
+ * @pid: the target process
+ * @flags: the flags to set
+ *
+ * If pid is 0, the flags are applied to the whole binder context.
+ * Otherwise, the flags are applied to the specific process only.
+ */
+static int binder_genl_set_report(struct binder_context *context, u32 pid,
+ u32 flags)
+{
+ struct binder_proc *proc;
+
+ if (flags != (flags & (BINDER_GENL_FLAG_OVERRIDE
+ | BINDER_GENL_FLAG_FAILED
+ | BINDER_GENL_FLAG_DELAYED
+ | BINDER_GENL_FLAG_SPAM))) {
+ pr_err("Invalid binder report flags: %u\n", flags);
+ return -EINVAL;
+ }
+
+ if (!pid) {
+ /* Set the global flags for the whole binder context */
+ context->report_flags = flags;
+ } else {
+ /* Set the per-process flags */
+ proc = binder_find_proc(pid);
+ if (!proc) {
+ pr_err("Invalid binder report pid %u\n", pid);
+ return -EINVAL;
+ }
+
+ proc->report_flags = flags;
+ }
+
+ return 0;
+}
+
+/**
+ * binder_genl_report_enabled() - check if binder genl reports are enabled
+ * @proc: the binder_proc to check
+ * @mask: the categories of binder genl reports
+ *
+ * Returns true if certain binder genl reports are enabled for this binder
+ * proc (when per-process overriding takes effect) or context.
+ */
+static bool binder_genl_report_enabled(struct binder_proc *proc, u32 mask)
+{
+ struct binder_context *context = proc->context;
+
+ if (!context->report_portid)
+ return false;
+
+ if (proc->report_flags & BINDER_GENL_FLAG_OVERRIDE)
+ return (proc->report_flags & mask) != 0;
+ else
+ return (context->report_flags & mask) != 0;
+}
+
+/**
+ * binder_genl_send_report() - send one binder genl report
+ * @context: the binder context
+ * @report: the binder genl report to send
+ * @len: the length of the report data
+ *
+ * Packs the report data into a BINDER_GENL_A_ATTR_REPORT packet and send it.
+ */
+static void binder_genl_send_report(struct binder_context *context,
+ struct binder_report *report, int len)
+{
+ int ret;
+ struct sk_buff *skb;
+ void *hdr;
+
+ trace_binder_send_report(context->name, report, len);
+
+ skb = genlmsg_new(nla_total_size(len), GFP_KERNEL);
+ if (!skb) {
+ pr_err("Failed to alloc binder genl message\n");
+ return;
+ }
+
+ hdr = genlmsg_put(skb, 0, atomic_inc_return(&context->report_seq),
+ &context->genl_family, 0, BINDER_GENL_CMD_REPORT);
+ if (!hdr) {
+ pr_err("Failed to set binder genl header\n");
+ kfree_skb(skb);
+ return;
+ }
+
+ if (nla_put(skb, BINDER_GENL_A_ATTR_REPORT, len, report)) {
+ genlmsg_cancel(skb, hdr);
+ nlmsg_free(skb);
+ return;
+ }
+
+ genlmsg_end(skb, hdr);
+
+ ret = genlmsg_unicast(&init_net, skb, context->report_portid);
+ if (ret < 0)
+ pr_err("Failed to send binder genl message to %d: %d\n",
+ context->report_portid, ret);
+}
+
static void binder_transaction(struct binder_proc *proc,
struct binder_thread *thread,
struct binder_transaction_data *tr, int reply,
@@ -3678,10 +3804,25 @@ static void binder_transaction(struct binder_proc *proc,
return_error_line = __LINE__;
goto err_copy_data_failed;
}
- if (t->buffer->oneway_spam_suspect)
+ if (t->buffer->oneway_spam_suspect) {
tcomplete->type = BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT;
- else
+ if (binder_genl_report_enabled(proc, BINDER_GENL_FLAG_SPAM)) {
+ struct binder_report report;
+
+ report.err = BR_ONEWAY_SPAM_SUSPECT;
+ report.from_pid = proc->pid;
+ report.from_tid = thread->pid;
+ report.to_pid = target_proc ? target_proc->pid : 0;
+ report.to_tid = target_thread ? target_thread->pid : 0;
+ report.reply = reply;
+ report.flags = tr->flags;
+ report.code = tr->code;
+ report.data_size = tr->data_size;
+ binder_genl_send_report(context, &report, sizeof(report));
+ }
+ } else {
tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
+ }
t->work.type = BINDER_WORK_TRANSACTION;
if (reply) {
@@ -3731,8 +3872,24 @@ static void binder_transaction(struct binder_proc *proc,
* process and is put in a pending queue, waiting for the target
* process to be unfrozen.
*/
- if (return_error == BR_TRANSACTION_PENDING_FROZEN)
+ if (return_error == BR_TRANSACTION_PENDING_FROZEN) {
tcomplete->type = BINDER_WORK_TRANSACTION_PENDING;
+ if (binder_genl_report_enabled(proc, BINDER_GENL_FLAG_DELAYED)) {
+ struct binder_report report;
+
+ report.err = return_error;
+ report.from_pid = proc->pid;
+ report.from_tid = thread->pid;
+ report.to_pid = target_proc ? target_proc->pid : 0;
+ report.to_tid = target_thread ? target_thread->pid : 0;
+ report.reply = reply;
+ report.flags = tr->flags;
+ report.code = tr->code;
+ report.data_size = tr->data_size;
+ binder_genl_send_report(context, &report,
+ sizeof(report));
+ }
+ }
binder_enqueue_thread_work(thread, tcomplete);
if (return_error &&
return_error != BR_TRANSACTION_PENDING_FROZEN)
@@ -3794,6 +3951,21 @@ static void binder_transaction(struct binder_proc *proc,
binder_dec_node_tmpref(target_node);
}
+ if (binder_genl_report_enabled(proc, BINDER_GENL_FLAG_FAILED)) {
+ struct binder_report report;
+
+ report.err = return_error;
+ report.from_pid = proc->pid;
+ report.from_tid = thread->pid;
+ report.to_pid = target_proc ? target_proc->pid : 0;
+ report.to_tid = target_thread ? target_thread->pid : 0;
+ report.reply = reply;
+ report.flags = tr->flags;
+ report.code = tr->code;
+ report.data_size = tr->data_size;
+ binder_genl_send_report(context, &report, sizeof(report));
+ }
+
binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
"%d:%d transaction %s to %d:%d failed %d/%d/%d, size %lld-%lld line %d\n",
proc->pid, thread->pid, reply ? "reply" :
@@ -6114,6 +6286,11 @@ static int binder_release(struct inode *nodp, struct file *filp)
binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
+ if (proc->pid == proc->context->report_portid) {
+ proc->context->report_portid = 0;
+ proc->context->report_flags = 0;
+ }
+
return 0;
}
@@ -6311,6 +6488,84 @@ binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
mutex_unlock(&binder_deferred_lock);
}
+/**
+ * binder_genl_nl_set_doit() - .doit handler for BINDER_GENL_CMD_SET
+ * @skb: the metadata struct passed from netlink driver
+ * @info: the generic netlink struct passed from netlink driver
+ *
+ * Implements the .doit function to process binder genl commands.
+ */
+int binder_genl_nl_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ int len;
+ int portid;
+ u32 pid;
+ u32 flags;
+ void *hdr;
+ struct binder_context *context;
+
+ /* Both attributes are required for BINDER_GENL_CMD_SET */
+ if (!info->attrs[BINDER_GENL_A_ATTR_PID] || !info->attrs[BINDER_GENL_A_ATTR_FLAGS]) {
+ pr_err("Attributes not set\n");
+ return -EINVAL;
+ }
+
+ portid = nlmsg_hdr(skb)->nlmsg_pid;
+ pid = nla_get_u32(info->attrs[BINDER_GENL_A_ATTR_PID]);
+ flags = nla_get_u32(info->attrs[BINDER_GENL_A_ATTR_FLAGS]);
+ context = container_of(info->family, struct binder_context,
+ genl_family);
+
+ if (context->report_portid && context->report_portid != portid) {
+ pr_err("No permission to set report flags from %u\n", portid);
+ return -EPERM;
+ }
+
+ if (binder_genl_set_report(context, pid, flags) < 0) {
+ pr_err("Failed to set report flags %u for %u\n", flags, pid);
+ return -EINVAL;
+ }
+
+ len = nla_total_size(sizeof(pid)) + nla_total_size(sizeof(flags));
+ skb = genlmsg_new(len, GFP_KERNEL);
+ if (!skb) {
+ pr_err("Failed to alloc binder genl reply message\n");
+ return -ENOMEM;
+ }
+
+ hdr = genlmsg_put_reply(skb, info, info->family, 0,
+ BINDER_GENL_CMD_REPLY);
+ if (!hdr)
+ goto free_skb;
+
+ if (nla_put_u32(skb, BINDER_GENL_A_ATTR_PID, pid))
+ goto cancel_skb;
+
+ if (nla_put_u32(skb, BINDER_GENL_A_ATTR_FLAGS, flags))
+ goto cancel_skb;
+
+ genlmsg_end(skb, hdr);
+
+ if (genlmsg_reply(skb, info)) {
+ pr_err("Failed to send binder genl reply message\n");
+ return -EFAULT;
+ }
+
+ if (!context->report_portid)
+ context->report_portid = portid;
+
+ return 0;
+
+cancel_skb:
+ pr_err("Failed to add genl header to reply message\n");
+ genlmsg_cancel(skb, hdr);
+
+free_skb:
+ pr_err("Failed to add genl attribute to reply message\n");
+ nlmsg_free(skb);
+ return -EMSGSIZE;
+}
+
static void print_binder_transaction_ilocked(struct seq_file *m,
struct binder_proc *proc,
const char *prefix,
@@ -6894,6 +7149,28 @@ const struct binder_debugfs_entry binder_debugfs_entries[] = {
{} /* terminator */
};
+/**
+ * binder_genl_init() - initialize binder generic netlink
+ * @family: the generic netlink family
+ * @name: the binder device name
+ *
+ * Registers the binder generic netlink family.
+ */
+int binder_genl_init(struct genl_family *family, const char *name)
+{
+ int ret;
+
+ memcpy(family, &binder_genl_nl_family, sizeof(*family));
+ strscpy(family->name, name, GENL_NAMSIZ);
+ ret = genl_register_family(family);
+ if (ret) {
+ pr_err("Failed to register binder genl: %s\n", name);
+ return ret;
+ }
+
+ return 0;
+}
+
static int __init init_binder_device(const char *name)
{
int ret;
@@ -6913,13 +7190,24 @@ static int __init init_binder_device(const char *name)
mutex_init(&binder_device->context.context_mgr_node_lock);
ret = misc_register(&binder_device->miscdev);
- if (ret < 0) {
- kfree(binder_device);
- return ret;
- }
+ if (ret < 0)
+ goto err_free_dev;
+
+ binder_device->context.report_seq = (atomic_t)ATOMIC_INIT(0);
+ ret = binder_genl_init(&binder_device->context.genl_family, name);
+ if (ret < 0)
+ goto err_misc_deregister;
hlist_add_head(&binder_device->hlist, &binder_devices);
+ return ret;
+
+err_misc_deregister:
+ misc_deregister(&binder_device->miscdev);
+
+err_free_dev:
+ kfree(binder_device);
+
return ret;
}
new file mode 100644
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/binder_genl.yaml */
+/* YNL-GEN kernel source */
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "binder_genl.h"
+
+#include <uapi/linux/binder_genl.h>
+
+/* BINDER_GENL_CMD_SET - do */
+static const struct nla_policy binder_genl_set_nl_policy[BINDER_GENL_A_ATTR_FLAGS + 1] = {
+ [BINDER_GENL_A_ATTR_PID] = { .type = NLA_U32, },
+ [BINDER_GENL_A_ATTR_FLAGS] = { .type = NLA_U32, },
+};
+
+/* Ops table for binder_genl */
+static const struct genl_split_ops binder_genl_nl_ops[] = {
+ {
+ .cmd = BINDER_GENL_CMD_SET,
+ .doit = binder_genl_nl_set_doit,
+ .policy = binder_genl_set_nl_policy,
+ .maxattr = BINDER_GENL_A_ATTR_FLAGS,
+ .flags = GENL_CMD_CAP_DO,
+ },
+};
+
+struct genl_family binder_genl_nl_family __ro_after_init = {
+ .name = BINDER_GENL_FAMILY_NAME,
+ .version = BINDER_GENL_FAMILY_VERSION,
+ .netnsok = true,
+ .parallel_ops = true,
+ .module = THIS_MODULE,
+ .split_ops = binder_genl_nl_ops,
+ .n_split_ops = ARRAY_SIZE(binder_genl_nl_ops),
+};
new file mode 100644
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/binder_genl.yaml */
+/* YNL-GEN kernel header */
+
+#ifndef _LINUX_BINDER_GENL_GEN_H
+#define _LINUX_BINDER_GENL_GEN_H
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <uapi/linux/binder_genl.h>
+
+int binder_genl_nl_set_doit(struct sk_buff *skb, struct genl_info *info);
+
+extern struct genl_family binder_genl_nl_family;
+
+#endif /* _LINUX_BINDER_GENL_GEN_H */
@@ -12,15 +12,32 @@
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/uidgid.h>
+#include <net/genetlink.h>
#include <uapi/linux/android/binderfs.h>
#include "binder_alloc.h"
#include "dbitmap.h"
+/**
+ * struct binder_context - information about a binder domain
+ * @binder_context_mgr_node: the context manager
+ * @context_mgr_node_lock: the lock protecting the above context manager node
+ * @binder_context_mgr_uid: the uid of the above context manager
+ * @name: the name of the binder device
+ * @genl_family: the generic netlink family
+ * @report_portid: the netlink socket to receive binder reports
+ * @report_flags: the categories of binder transactions that would
+ * be reported (see enum binder_report_flag).
+ * @report_seq: the seq number of the generic netlink report
+ */
struct binder_context {
struct binder_node *binder_context_mgr_node;
struct mutex context_mgr_node_lock;
kuid_t binder_context_mgr_uid;
const char *name;
+ struct genl_family genl_family;
+ u32 report_portid;
+ u32 report_flags;
+ atomic_t report_seq;
};
/**
@@ -415,6 +432,8 @@ struct binder_ref {
* @binderfs_entry: process-specific binderfs log file
* @oneway_spam_detection_enabled: process enabled oneway spam detection
* or not
+ * @report_flags: the categories of binder transactions that would
+ * be reported (see enum binder_report_flag).
*
* Bookkeeping structure for binder processes
*/
@@ -453,6 +472,7 @@ struct binder_proc {
spinlock_t outer_lock;
struct dentry *binderfs_entry;
bool oneway_spam_detection_enabled;
+ u32 report_flags;
};
/**
@@ -582,4 +602,6 @@ struct binder_object {
};
};
+int binder_genl_init(struct genl_family *family, const char *name);
+
#endif /* _LINUX_BINDER_INTERNAL_H */
@@ -423,6 +423,43 @@ TRACE_EVENT(binder_return,
"unknown")
);
+TRACE_EVENT(binder_send_report,
+ TP_PROTO(const char *name, struct binder_report *report, int len),
+ TP_ARGS(name, report, len),
+ TP_STRUCT__entry(
+ __field(const char *, name)
+ __field(uint32_t, err)
+ __field(uint32_t, from_pid)
+ __field(uint32_t, from_tid)
+ __field(uint32_t, to_pid)
+ __field(uint32_t, to_tid)
+ __field(uint32_t, reply)
+ __field(uint32_t, flags)
+ __field(uint32_t, code)
+ __field(binder_size_t, data_size)
+ __field(uint32_t, len)
+ ),
+ TP_fast_assign(
+ __entry->name = name;
+ __entry->err = report->err;
+ __entry->from_pid = report->from_pid;
+ __entry->from_tid = report->from_tid;
+ __entry->to_pid = report->to_pid;
+ __entry->to_tid = report->to_tid;
+ __entry->reply = report->reply;
+ __entry->flags = report->flags;
+ __entry->code = report->code;
+ __entry->data_size = report->data_size;
+ __entry->len = len;
+ ),
+ TP_printk("%s: %d %d:%d -> %d:%d %s flags=0x08%x code=%d %llu %d",
+ __entry->name, __entry->err, __entry->from_pid,
+ __entry->from_tid, __entry->to_pid, __entry->to_tid,
+ __entry->reply ? "reply" : "",
+ __entry->flags, __entry->code, __entry->data_size,
+ __entry->len)
+);
+
#endif /* _BINDER_TRACE_H */
#undef TRACE_INCLUDE_PATH
@@ -207,6 +207,10 @@ static int binderfs_binder_device_create(struct inode *ref_inode,
fsnotify_create(root->d_inode, dentry);
inode_unlock(d_inode(root));
+ ret = binder_genl_init(&device->context.genl_family, name);
+ if (ret < 0)
+ goto err;
+
return 0;
err:
@@ -588,5 +588,36 @@ enum binder_driver_command_protocol {
*/
};
+/*
+ * struct binder_report - reports an abnormal binder transaction
+ * @err: copy of binder_driver_return_protocol returned to the sender
+ * @from_pid: sender pid of the corresponding binder transaction
+ * @from_tid: sender tid of the corresponding binder transaction
+ * @to_pid: target pid of the corresponding binder transaction
+ * @to_tid: target tid of the corresponding binder transaction
+ * @reply: 1 means the txn is a reply, 0 otherwise
+ * @flags: copy of binder_transaction_data->flags
+ * @code: copy of binder_transaction_data->code
+ * @data_size: copy of binder_transaction_data->data_size
+ *
+ * When a binder transaction fails to reach the target process or is not
+ * delivered on time, an error command BR_XXX is returned from the kernel
+ * binder driver to the user space sender. This is considered an abnormal
+ * binder transaction. The most important information about this abnormal
+ * binder transaction will be packed into this binder_report struct and sent
+ * to the registered user space administration process via generic netlink.
+ */
+struct binder_report {
+ __u32 err;
+ __u32 from_pid;
+ __u32 from_tid;
+ __u32 to_pid;
+ __u32 to_tid;
+ __u32 reply;
+ __u32 flags;
+ __u32 code;
+ binder_size_t data_size;
+};
+
#endif /* _UAPI_LINUX_BINDER_H */
new file mode 100644
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/binder_genl.yaml */
+/* YNL-GEN uapi header */
+
+#ifndef _UAPI_LINUX_BINDER_GENL_H
+#define _UAPI_LINUX_BINDER_GENL_H
+
+#define BINDER_GENL_FAMILY_NAME "binder_genl"
+#define BINDER_GENL_FAMILY_VERSION 1
+
+/**
+ * enum binder_genl_flag - Used with "set" and "reply" command below, defining
+ * what kind of binder transactions reported to the user space administration
+ * process.
+ */
+enum binder_genl_flag {
+ BINDER_GENL_FLAG_FAILED = 1,
+ BINDER_GENL_FLAG_DELAYED = 2,
+ BINDER_GENL_FLAG_SPAM = 4,
+ BINDER_GENL_FLAG_OVERRIDE = 8,
+};
+
+enum {
+ BINDER_GENL_A_ATTR_PID = 1,
+ BINDER_GENL_A_ATTR_FLAGS,
+ BINDER_GENL_A_ATTR_REPORT,
+
+ __BINDER_GENL_A_ATTR_MAX,
+ BINDER_GENL_A_ATTR_MAX = (__BINDER_GENL_A_ATTR_MAX - 1)
+};
+
+enum {
+ BINDER_GENL_CMD_SET = 1,
+ BINDER_GENL_CMD_REPLY,
+ BINDER_GENL_CMD_REPORT,
+
+ __BINDER_GENL_CMD_MAX,
+ BINDER_GENL_CMD_MAX = (__BINDER_GENL_CMD_MAX - 1)
+};
+
+#endif /* _UAPI_LINUX_BINDER_GENL_H */