From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
The patch set UID as standard Bluetooth user for Android (AID_BLUETOOTH).
It also sets the same capability needed for systemd service (found
in src/bluetooth.service.
---
android/main.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.ac | 4 ++++
2 files changed, 57 insertions(+)
diff --git a/android/main.c b/android/main.c
index fac1003..e7f842e 100644
--- a/android/main.c
+++ b/android/main.c
@@ -33,10 +33,17 @@
#include <stdbool.h>
#include <string.h>
#include <errno.h>
+#include <unistd.h>
+
#include <sys/signalfd.h>
#include <sys/socket.h>
#include <sys/un.h>
+#if defined(ANDROID)
+#include <sys/prctl.h>
+#include <private/android_filesystem_config.h>
+#endif
+
#include <glib.h>
#include "log.h"
@@ -409,6 +416,49 @@ static void cleanup_hal_connection(void)
}
}
+static bool set_capabilities(void)
+{
+#if defined(ANDROID)
+ struct __user_cap_header_struct header;
+ struct __user_cap_data_struct cap;
+
+ DBG("pid %d uid %d gid %d", getpid(), getuid(), getgid());
+
+ header.version = _LINUX_CAPABILITY_VERSION;
+
+ prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
+
+ if (setgid(AID_BLUETOOTH) < 0)
+ warn("%s: setgid(): %s", __func__, strerror(errno));
+
+ if (setuid(AID_BLUETOOTH) < 0)
+ warn("%s: setuid(): %s", __func__, strerror(errno));
+
+ header.version = _LINUX_CAPABILITY_VERSION;
+ header.pid = 0;
+
+ cap.effective = cap.permitted =
+ CAP_TO_MASK(CAP_NET_RAW) |
+ CAP_TO_MASK(CAP_NET_ADMIN) |
+ CAP_TO_MASK(CAP_NET_BIND_SERVICE);
+ cap.inheritable = 0;
+
+ if (capset(&header, &cap) < 0) {
+ error("%s: capset(): %s", __func__, strerror(errno));
+ return false;
+ }
+
+ if (capget(&header, &cap) < 0)
+ error("%s: capget(): %s", __func__, strerror(errno));
+ else
+ DBG("Caps: eff: 0x%x, perm: 0x%x, inh: 0x%x", cap.effective,
+ cap.permitted, cap.inheritable);
+
+ DBG("pid %d uid %d gid %d", getpid(), getuid(), getgid());
+#endif
+ return true;
+}
+
int main(int argc, char *argv[])
{
GOptionContext *context;
@@ -442,6 +492,9 @@ int main(int argc, char *argv[])
__btd_log_init("*", 0);
+ if (!set_capabilities())
+ return EXIT_FAILURE;
+
if (!init_mgmt_interface())
return EXIT_FAILURE;
diff --git a/configure.ac b/configure.ac
index b4d3998..e3b5220 100644
--- a/configure.ac
+++ b/configure.ac
@@ -247,4 +247,8 @@ AC_ARG_ENABLE(android, AC_HELP_STRING([--enable-android],
[enable_android=${enableval}])
AM_CONDITIONAL(ANDROID, test "${enable_android}" = "yes")
+if (test "${enable_android}" = "yes"); then
+ AC_CHECK_LIB(cap, capget, dummy=yes, AC_MSG_ERROR(libcap is required))
+fi
+
AC_OUTPUT(Makefile src/bluetoothd.8 lib/bluez.pc)
--
1.8.1.2
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