125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/xadd.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, 1);
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__type(key, long long);
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__type(value, long long);
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} map_hash_8b SEC(".maps");
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SEC("tc")
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__description("xadd/w check unaligned stack")
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__failure __msg("misaligned stack access off")
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__naked void xadd_w_check_unaligned_stack(void)
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{
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asm volatile (" \
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r0 = 1; \
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*(u64*)(r10 - 8) = r0; \
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lock *(u32 *)(r10 - 7) += w0; \
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r0 = *(u64*)(r10 - 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tc")
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__description("xadd/w check unaligned map")
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__failure __msg("misaligned value access off")
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__naked void xadd_w_check_unaligned_map(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_hash_8b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 != 0 goto l0_%=; \
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exit; \
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l0_%=: r1 = 1; \
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lock *(u32 *)(r0 + 3) += w1; \
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r0 = *(u32*)(r0 + 3); \
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exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_hash_8b)
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: __clobber_all);
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}
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SEC("xdp")
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__description("xadd/w check unaligned pkt")
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__failure __msg("BPF_ATOMIC stores into R2 pkt is not allowed")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void xadd_w_check_unaligned_pkt(void)
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{
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asm volatile (" \
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r2 = *(u32*)(r1 + %[xdp_md_data]); \
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r3 = *(u32*)(r1 + %[xdp_md_data_end]); \
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r1 = r2; \
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r1 += 8; \
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if r1 < r3 goto l0_%=; \
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r0 = 99; \
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goto l1_%=; \
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l0_%=: r0 = 1; \
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r1 = 0; \
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*(u32*)(r2 + 0) = r1; \
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r1 = 0; \
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*(u32*)(r2 + 3) = r1; \
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lock *(u32 *)(r2 + 1) += w0; \
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lock *(u32 *)(r2 + 2) += w0; \
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r0 = *(u32*)(r2 + 1); \
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l1_%=: exit; \
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" :
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: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
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__imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
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: __clobber_all);
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}
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SEC("tc")
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__description("xadd/w check whether src/dst got mangled, 1")
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__success __retval(3)
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__naked void src_dst_got_mangled_1(void)
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{
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asm volatile (" \
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r0 = 1; \
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r6 = r0; \
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r7 = r10; \
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*(u64*)(r10 - 8) = r0; \
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lock *(u64 *)(r10 - 8) += r0; \
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lock *(u64 *)(r10 - 8) += r0; \
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if r6 != r0 goto l0_%=; \
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if r7 != r10 goto l0_%=; \
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r0 = *(u64*)(r10 - 8); \
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exit; \
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l0_%=: r0 = 42; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tc")
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__description("xadd/w check whether src/dst got mangled, 2")
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__success __retval(3)
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__naked void src_dst_got_mangled_2(void)
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{
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asm volatile (" \
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r0 = 1; \
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r6 = r0; \
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r7 = r10; \
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*(u32*)(r10 - 8) = r0; \
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lock *(u32 *)(r10 - 8) += w0; \
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lock *(u32 *)(r10 - 8) += w0; \
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if r6 != r0 goto l0_%=; \
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if r7 != r10 goto l0_%=; \
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r0 = *(u32*)(r10 - 8); \
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exit; \
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l0_%=: r0 = 42; \
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exit; \
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" ::: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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