99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2024 Isovalent */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_misc.h"
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const volatile long foo = 42;
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long bar;
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long bart = 96;
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SEC("tc/ingress")
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__description("rodata/strtol: write rejected")
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__failure __msg("write into map forbidden")
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int tcx1(struct __sk_buff *skb)
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{
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char buff[] = { '8', '4', '\0' };
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bpf_strtol(buff, sizeof(buff), 0, (long *)&foo);
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return TCX_PASS;
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}
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SEC("tc/ingress")
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__description("bss/strtol: write accepted")
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__success
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int tcx2(struct __sk_buff *skb)
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{
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char buff[] = { '8', '4', '\0' };
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bpf_strtol(buff, sizeof(buff), 0, &bar);
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return TCX_PASS;
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}
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SEC("tc/ingress")
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__description("data/strtol: write accepted")
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__success
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int tcx3(struct __sk_buff *skb)
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{
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char buff[] = { '8', '4', '\0' };
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bpf_strtol(buff, sizeof(buff), 0, &bart);
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return TCX_PASS;
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}
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SEC("tc/ingress")
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__description("rodata/mtu: write rejected")
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__failure __msg("write into map forbidden")
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int tcx4(struct __sk_buff *skb)
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{
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bpf_check_mtu(skb, skb->ifindex, (__u32 *)&foo, 0, 0);
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return TCX_PASS;
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}
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SEC("tc/ingress")
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__description("bss/mtu: write accepted")
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__success
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int tcx5(struct __sk_buff *skb)
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{
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bpf_check_mtu(skb, skb->ifindex, (__u32 *)&bar, 0, 0);
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return TCX_PASS;
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}
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SEC("tc/ingress")
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__description("data/mtu: write accepted")
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__success
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int tcx6(struct __sk_buff *skb)
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{
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bpf_check_mtu(skb, skb->ifindex, (__u32 *)&bart, 0, 0);
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return TCX_PASS;
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}
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static inline void write_fixed(volatile void *p, __u32 val)
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{
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*(volatile __u32 *)p = val;
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}
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static inline void write_dyn(void *p, void *val, int len)
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{
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bpf_copy_from_user(p, len, val);
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}
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SEC("tc/ingress")
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__description("rodata/mark: write with unknown reg rejected")
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__failure __msg("write into map forbidden")
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int tcx7(struct __sk_buff *skb)
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{
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write_fixed((void *)&foo, skb->mark);
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return TCX_PASS;
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}
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SEC("lsm.s/bprm_committed_creds")
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__description("rodata/mark: write with unknown reg rejected")
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__failure __msg("write into map forbidden")
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int BPF_PROG(bprm, struct linux_binprm *bprm)
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{
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write_dyn((void *)&foo, &bart, bpf_get_prandom_u32() & 3);
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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