جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: bpf, xdp: move offload check into dev_xdp_install() bpf_xdp_link_update() calls dev_xdp_install() directly and skips dev_xdp_attach(), so the checks in dev_xdp_attach() do not run. A user can make an XDP link with a normal program and then swap in an offloaded or device-bound program with BPF_LINK_UPDATE, which puts it on the software path. dev_xdp_install() is the one place all three paths go through: "ip link set xdp" and BPF_LINK_CREATE reach it via dev_xdp_attach(), and BPF_LINK_UPDATE calls it directly. So move the program checks (offloaded, bound to another device, device-bound in generic mode, native vs generic, DEVMAP and CPUMAP) there, and keep only the netlink-flag check (XDP_FLAGS_UPDATE_IF_NOEXIST) in dev_xdp_attach().

• https://git.kernel.org/stable/c/4a0467819bc2423be8fc4c9834e8f42af2af0861
• https://git.kernel.org/stable/c/bd06033625ec20b7bdec43d21f776fc1a5e9000e
• https://git.kernel.org/stable/c/486dbe7efec2be19cd3625be282f7f6b34a3f2c5
• https://git.kernel.org/stable/c/f14b774ec9bd52d0f4ec29a6597a35fd107197f9
• https://git.kernel.org/stable/c/ea7b35dcc9430293b861bc7bad0c546f193c85f9
• https://git.kernel.org/stable/c/03022dd874070768a7099f18b1944c633641315f
• https://git.kernel.org/stable/c/ad27ed7d2309419a129078d781504f486b1b469a