https://findns94.github.io Martin Zhao's Blog Fri, 10 Jul 2026 13:48:16 GMT https://validator.w3.org/feed/docs/rss2.html https://github.com/jpmonette/feed zh-CN Martin Zhao 2026 https://findns94.github.io/posts/fstrace-filter-parent-function/ https://findns94.github.io/posts/fstrace-filter-parent-function/ Sun, 07 May 2023 20:40:54 GMT https://findns94.github.io/posts/learn-linux-step-1/ https://findns94.github.io/posts/learn-linux-step-1/ Sun, 05 Dec 2021 20:22:30 GMT https://findns94.github.io/posts/qemu-aarch64-linux-in-wsl/ https://findns94.github.io/posts/qemu-aarch64-linux-in-wsl/ Sun, 12 Sep 2021 22:15:59 GMT https://findns94.github.io/posts/learn-arm-assembly-language/ https://findns94.github.io/posts/learn-arm-assembly-language/ Sun, 16 May 2021 20:25:50 GMT Arm Assembly https://findns94.github.io/posts/what-happens-after-access-address/ https://findns94.github.io/posts/what-happens-after-access-address/ Sun, 21 Feb 2021 19:34:02 GMT #include int main() { unsigned long long *x = (unsigned long long)0x0000007000003000; int *p = (int*)mmap(0x0000007000003000, sizeof(unsigned long long) * 10, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0); printf("before write, x = %llu\n", *x); *x = 1; printf("after write, x = %llu\n", *x); } ``` If the user-space virtual address `0x0000007000003000` is not mapped in advance via mmap with read and write permissions, a `Segmentation fault (core dumped)` will occur, because `0x0000007000003000` is not managed as a vma (virtual memory area) allocated through mmap or brk in the process's virtual address space, and thus the virtual address is not accessible at this point. The output after compilation is as follows. ``` before write, x = 0 after write, x = 1 ``` As can be seen, a new value was successfully written to the user-space virtual address `0x0000007000003000`.]]> Operating System Linux Memory https://findns94.github.io/posts/kkbox/ https://findns94.github.io/posts/kkbox/ Fri, 21 Jun 2019 21:23:16 GMT Data Mining Clustering LightGBM https://findns94.github.io/posts/dao-validation/ https://findns94.github.io/posts/dao-validation/ Mon, 22 Apr 2019 22:41:57 GMT Formal Validation Smart Contract https://findns94.github.io/posts/face/ https://findns94.github.io/posts/face/ Wed, 03 Apr 2019 22:49:31 GMT Large-scale Multimedia Deep Learning Face Recognition https://findns94.github.io/posts/risk/ https://findns94.github.io/posts/risk/ Thu, 28 Mar 2019 21:36:21 GMT Machine Learning Big Data Fundamentals https://findns94.github.io/posts/blockchain/ https://findns94.github.io/posts/blockchain/ Tue, 19 Mar 2019 21:14:51 GMT Blockchain Bitcoin https://findns94.github.io/posts/hmm/ https://findns94.github.io/posts/hmm/ Tue, 19 Mar 2019 20:13:07 GMT HMM Language Model https://findns94.github.io/posts/rnn-adversarial/ https://findns94.github.io/posts/rnn-adversarial/ Sat, 09 Mar 2019 23:14:03 GMT Adversarial Examples RNN https://findns94.github.io/posts/confu/ https://findns94.github.io/posts/confu/ Thu, 28 Feb 2019 23:27:41 GMT Joint Project JVM https://findns94.github.io/posts/recommendation/ https://findns94.github.io/posts/recommendation/ Sat, 23 Feb 2019 20:59:16 GMT Innovation Practice Recommendation https://findns94.github.io/posts/sitting_posture/ https://findns94.github.io/posts/sitting_posture/ Fri, 22 Feb 2019 20:00:00 GMT Sitting Posture Innovation Practice Paper