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Software interrupt implemented fault injection method in Linux kernel

Aiming at the problem of evaluating the dependability of fault-tolerant operating system, a scheme was proposed to inject single-bit faults in the Linux kernel. Based on software interrupt technology existing in x86 architecture, a probe point was firstly installed in the timer interrupt using loadable kernel module. Then the faults data were delivered from user space to kernel space. Finally about 6 700 faults including transient, intermittent and permanent type were conducted targeting four kernel subsystems, i. e. arch, fs, kernel and mm, by means of a C / S fault injecting model. Experiments indicate that compared with arch and fs subsystems, the kernel and mm are more sensitive to faults, the average detection fault coverage reaches 38. 23%. Compared with data segment, the code segment is more sensitive to faults, the average detection fault coverage reaches 73. 49%. This scheme improves the speed and accuracy when evaluating the dependability of faulttolerant operating system.