Call vfork through libc only#1144
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trcrsired merged 2 commits intocppfastio:nextfrom Apr 24, 2025
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April 24, 2025 23:10
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The libc syscall() function does not handle vfork correctly
The vfork syscall is similar to fork, as it returns both in the child process and the parent process
The key difference is that the child process created by vfork shares the address space with the parent until an _exit or execve syscall is executed
This means even a simple function return in the child process can corrupt the parent's memory
The vfork api in libc is specially designed to back up and restore critical memory during a vfork syscall, which makes it irreplaceable by fast_io