Kernel module fatal exception / stack trace #31. Open ShonkyCH opened this issue Jan 15, 2019 · 11 comments Open Kernel module fatal exception / stack trace #31.
Exceptions An exception is transfer of control to the operating system (OS) kernel in response to some event (i.e. change in processor state) Kernel is the memory-resident part of the OS Examples: division by 0, page fault, I/O request completes, Ctrl-C How does the system know where to jump to in the OS? 10 User Code OS Kernel Code exception Typically, the two exceptions are handled serially. However, there are several exceptions that cannot be handled serially, and in this situation the processor signals a double fault. There are two common causes of a double fault: A kernel stack overflow. This overflow occurs when a guard page is hit, and the kernel tries to push a trap frame.
Oct 16, 2008 · There are public routines defined for recent operating system releases (KeExpandKernelStackAndCallout) that provide limited support for increasing the kernel stack. However, these are not a general substitute for properly designing your driver to avoid consuming so much stack in the first place.
The kernel can then use the GS prefix on normal memory references to access kernel data structures. Similarly, when the OS kernel is entered using an interrupt or exception (where the kernel stack is already set up), SWAPGS can be used to quickly get a pointer to the kernel data structures.
Stack Exchange Network ... After upgrade to 16.04 Ubuntu crashes all the time with “Kernel panic - not syncing: fatal exception in interrupt” ... Kernel Panic ... A driver has corrupted a kernel synchronization object, such as a KEVENT (for example double initializing a KEVENT while a thread was still waiting on that same KEVENT, or allowing a stack-based KEVENT to go out of scope while another thread was using that KEVENT). This type of bug check typically occurs in nt!Ke* or nt!Ki* code. I am using Linux kernel 3.0.35 on Freescale i.MX6 (ARM Cortex-A9). After running into a kernel OOPS I tried to understand the exception stack initialization. Here is what I have uncovered so far. In cpu_init() in arch/arm/kernel/setup.c, I see the exception stack getting initialized:
Jan 29, 2016 · As the exception handler are on the stack and as an attacker, we have the ability to overwrite things on the stack, we will overwrite the exception handler with the address of our shellcode and will raise the exception while copying the user supplied buffer to kernel allocated buffer to jump to our shellcode. In a Linux system, every user process has 2 stacks, a user stack and a dedicated kernel stack for the process. The user stack resides in the user address space (first 3GB in 32-bit x86 arch.) and the kernel stack resides in the kernel address spac...
Oct 23, 2007 · 1. The ones that hook interrupt/exception handlers. If we assume that it is user-mode and not kernel-mode code that gets interrupted, then user-mode EIP is on top of the stack and user-mode ESP is 12 bytes below it at the moment your function that hooks interrupt/exception handler enters execution 2. Aug 01, 2017 · Setting up the driver. For this tutorial, we’d be exploiting the stack overflow module in the HEVD driver.Download the source from github, and either you can build the driver yourself from the steps mentioned on the github page, or download the vulnerable version here and select the one according to the architecture (32-bit or 64-bit). the faulting thread informs the Cache Kernel that exception processingis complete. The Cache Kernel then restores the stack pointer, program counter, and a few other registers, and resumes the thread in step 6. As an optimization, there is a special Cache Kernel call that both loads a new map-ping and returns from the exception handler. To provide Jan 22, 2020 · Control-flow integrity (CFI) is a technique used to reduce the ability to redirect the execution of a program's code in attacker-specified ways. The Clang compiler has some features that can assist in maintaining control-flow integrity, which have been applied to the Android kernel.
The GDT should be loaded here. Paging should be enabled here. C++ features such as global constructors and exceptions will require runtime support to work as well. */ /* Enter the high-level kernel. The ABI requires the stack is 16-byte aligned at the time of the call instruction (which afterwards pushes the return pointer of size 4 bytes). When exception occurs, kernel searches for exception handlers on the top stack frame. If none exists, it moves down the stack frames until it finds frame-based exception handler. If none exists, the kernel calls its own default exception handler: UnHandledExceptionFilter to continue execution from the point at which the exception occurred. Invoked when handling one exception causes another exception. Happens when the kernel is very confused (e.g. kernel stack pointer corrupt). Using a separate stack allows the kernel to recover from it well enough in many cases to still output an oops. ESTACK_NMI. EXCEPTION_STKSZ (PAGE_SIZE). Used for non-maskable interrupts (NMI).
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Jan 10, 2020 · ELK stack i.e. ElasticSearch Logstash and Kibana. We will walk you through a couple of errors you may see while working on ELK stack and their solutions. Error: missing authentication token for REST request. First, thing first how to run cluster curl commands which are spared everywhere on the Elastic documentation portal. They have a copy as a ...
Oct 18, 2017 · Since malicious kernel code (rootkits) often seeks to establish persistence in unfriendly territory, stealth technology plays a fundamental role. Technical Description. The idea behind this BoundHook technique is to cause an exception in a very specific location in a user-mode context and catch the exception to gain control over the thread ... the faulting thread informs the Cache Kernel that exception processingis complete. The Cache Kernel then restores the stack pointer, program counter, and a few other registers, and resumes the thread in step 6. As an optimization, there is a special Cache Kernel call that both loads a new map-ping and returns from the exception handler. To provide
There is no runtime library for them and exception handling use too much stack memory that is very limited in the kernel (I experimented with C++ exceptions in Windows NT kernel and exception throwing and unwinding eats a half of available stack - very easy to get stack overflow and crash the whole system).