privilege | 易学教程

java jstack tool insufficient memory or insufficient privilege to attach

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问题 I am really confused about: In my windows 2008r2, I have a windows service, in fact it's a java progress running as SYSTEM user. Now, I use Jstack rawly to the the service. But it occur error : insufficient memory or insufficient privilege to attach But if I use Jstack's options -F , it can work finely. I view the jdk's source, It uses a class BugSpotAgent to finish above. I want to know the root cause I can't use Jstack rawly, is it the SYSTEM user privilege problem? I also have try to use

java jstack tool insufficient memory or insufficient privilege to attach

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Current x86 privilege level on a custom OS

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问题 In a custom OS running on an x86 in protected mode, is there a way to obtain the current privilege level, other than e.g. executing a privileged instruction and seeing if it crashes? For instance, register CR0 contains the PE bit, which indicates if we are running on real mode or protected mode, and can be easily retrieved using assembly code. Is there something equivalent for the privilege level? The Intel architecture software developer manual mentions that the EFLAGS register contains two

Root priv can't be dropped in python even after seteuid. A bug?

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问题 Root priv can't be dropped in python even after seteuid. A bug? EDIT Summary: I forgot to drop gid. The accepted answer may help you, though. Hi. I can't drop the root privilege in python 3.2 on my linux. In fact, even after seteuid(1000), it can read root-owned 400-mode files. The euid is surely set to 1000! I found after empty os.fork() call, the privileged access is correctly denied. (But it's only in the parent. The child can still read illegitimately.) Is it a bug in python, or is linux

What specifically causes EPrivilege to be raised?

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问题 I'm getting a bug report that some functionality in some music-playing code in an external DLL (SDL_Mixer, in case it helps) that my program uses is raising EPrivilege. The DLL is written in C, so I can't get useful stack trace information out of it with MadExcept, and the problem is not reproducible on my end. And just to make things worse, I don't even know what EPrivilege is . I've never seen it come up in my own code, there's very little information about it available online, and what

What specifically causes EPrivilege to be raised?

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I'm getting a bug report that some functionality in some music-playing code in an external DLL (SDL_Mixer, in case it helps) that my program uses is raising EPrivilege. The DLL is written in C, so I can't get useful stack trace information out of it with MadExcept, and the problem is not reproducible on my end. And just to make things worse, I don't even know what EPrivilege is . I've never seen it come up in my own code, there's very little information about it available online, and what there is is contradictory. (One explanation says it's raised by the OS if you try to do something with a

How to bind to a port less than 1024 in Android?

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I have an Android service trying to bind to a server socket port 24. As it is privileged port, it is failing with a bind exception. I am wondering what I need to do to get this working. I see this was asked couple of times in this forum, but without a resolution. This service runs on a device that runs on Android. We build android platform for the device. We have all the control we need. cnvzmxcvmcx To bind to a port less than 1024, you need to be root and there are two ways of doing that. System app : The app should be installed into /system/apps folder from where it shall be run as root.

Difference between DPL and RPL in x86

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问题 Reading intel x86 Manual and other sources, i did not understand the difference between DPL (Descriptor privilege level) and RPL (Requested privilege level). Why is there necessity to have both? Thank you so much 回答1: Good question. CPL vs. DPL vs. RPL To make this simpler, let's first just consider CPL and DPL: The CPL is your current privilege level. The DPL is the privilege level of a segment. It defines the minimum 1 privilege level required to access the segment. Privilege levels range

How to bind to a port less than 1024 in Android?

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问题 I have an Android service trying to bind to a server socket port 24. As it is privileged port, it is failing with a bind exception. I am wondering what I need to do to get this working. I see this was asked couple of times in this forum, but without a resolution. This service runs on a device that runs on Android. We build android platform for the device. We have all the control we need. 回答1: To bind to a port less than 1024, you need to be root and there are two ways of doing that. System