Linux Kernel UDP skb_transport_header Uninitialized Use-After-Free/BUG Trigger Analysis

漏洞概述 该漏洞涉及Linux内核中的 函数，当 未设置时，该函数会返回 。这可能导致在调用 时触发BUG，特别是在处理UDP数据包时。 影响范围 内核版本: 2.6.32-503.10.1.el6.x86_64 触发条件: 当 未设置时，调用 会触发BUG。 相关函数: 、 、 等。 修复方案 修复建议: 在调用 之前，确保 已正确设置。 代码修改: 在 中， 函数内，增加对 的检查，确保其已设置。 POC代码或利用代码 ```c struct iphdr iph = (struct iphdr )skb->data; struct udphdr uh = (struct udphdr )(skb->data + iph->ihl 4); struct sk_buff skb2 = skb_clone(skb, GFP_ATOMIC); if (!skb2) goto free_skb; skb2->mac_header = skb->mac_header; skb2->network_header = skb->network_header; skb2->transport_header = skb->transport_header; if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if (skb2->len > 0) { skb2->data = skb2->head; skb2->tail = skb2->data + skb2->len; skb2->end = skb2->tail; } if

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Linux Kernel UDP skb_transport_header Uninitialized Use-After-Free/BUG Trigger Analysis