解决init: sys_prop: permission denied uid:1003 name:service.bootanim.exit问题

这个错误是在调用property_set函数时出现的。通过打印信息，找到了以下代码

/android/system/core/init/property_service.cif (check_perms(msg.name, cr.uid, cr.gid, source_ctx)) {property_set((char*) msg.name, (char*) msg.value);} else {ERROR("sys_prop: permission denied uid:%d  name:%s\n",cr.uid, msg.name);}

继续查找check_perms函数，发现以下相关代码

    for (i = 0; property_perms[i].prefix; i++) {        if (strncmp(property_perms[i].prefix, name,                    strlen(property_perms[i].prefix)) == 0) {            if ((uid && property_perms[i].uid == uid) ||                (gid && property_perms[i].gid == gid)) {                return check_mac_perms(name, sctx);            }        }    }

查看property_perms，

struct {    const char *prefix;    unsigned int uid;    unsigned int gid;} property_perms[] = {    { "net.rmnet0.",      AID_RADIO,    0 },    { "net.gprs.",        AID_RADIO,    0 },    { "net.ppp",          AID_RADIO,    0 },    { "net.qmi",          AID_RADIO,    0 },    { "net.lte",          AID_RADIO,    0 },    { "net.cdma",         AID_RADIO,    0 },    { "ril.",             AID_RADIO,    0 },    { "gsm.",             AID_RADIO,    0 },    { "persist.radio",    AID_RADIO,    0 },    { "net.dns",          AID_RADIO,    0 },    { "sys.usb.config",   AID_RADIO,    0 },    { "net.",             AID_SYSTEM,   0 },    { "dev.",             AID_SYSTEM,   0 },    { "runtime.",         AID_SYSTEM,   0 },    { "hw.",              AID_SYSTEM,   0 },    { "sys.",             AID_SYSTEM,   0 },    { "sys.powerctl",     AID_SHELL,    0 },    { "service.",         AID_SYSTEM,   0 },    { "wlan.",            AID_SYSTEM,   0 },    { "bluetooth.",       AID_BLUETOOTH,   0 },    { "dhcp.",            AID_SYSTEM,   0 },    { "dhcp.",            AID_DHCP,     0 },    { "debug.",           AID_SYSTEM,   0 },    { "debug.",           AID_SHELL,    0 },    { "log.",             AID_SHELL,    0 },    { "service.adb.root", AID_SHELL,    0 },    { "service.adb.tcp.port", AID_SHELL,    0 },    { "persist.sys.",     AID_SYSTEM,   0 },    { "persist.service.", AID_SYSTEM,   0 },    { "persist.security.", AID_SYSTEM,   0 },    { "persist.service.bdroid.", AID_BLUETOOTH,   0 },    { "selinux."         , AID_SYSTEM,   0 },    { "wfd.enable",        AID_MEDIA,    0 },    { NULL, 0, 0 }};

可见问题的关键在于bootanimation服务的进程uid与AID_SYSTEM不一致

既然找到问题的根源，那么接下来就是想办法解决问题了。
有两种方法可以解决这个问题：

方法一：
在property_perms中，增加一项，匹配bootanimation服务的进程uid,我的uid是graphics，
所以添加如下

{ "service.bootanim.",         AID_GRAPHICS,   0 },

方法二：
比较暴力的做法，直接修改进程uid。找到启动bootanimation服务的地方

service bootanim /system/bin/bootanimation    class main    user graphics    group graphics    disabled    oneshot

将user graphics改为user system

至此，问题解决！

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