| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ |
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| 3 | #include <vmlinux.h> |
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| 4 | #include <bpf/bpf_tracing.h> |
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| 5 | #include <bpf/bpf_helpers.h> |
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| 6 | #include "../bpf_testmod/bpf_testmod_kfunc.h" |
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| 7 | |
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| 8 | static struct prog_test_ref_kfunc __kptr *v; |
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| 9 | long total_sum = -1; |
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| 10 | |
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| 11 | SEC("tc" ) |
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| 12 | int test_jit_probe_mem(struct __sk_buff *ctx) |
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| 13 | { |
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| 14 | struct prog_test_ref_kfunc *p; |
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| 15 | unsigned long zero = 0, sum; |
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| 16 | |
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| 17 | p = bpf_kfunc_call_test_acquire(scalar_ptr: &zero); |
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| 18 | if (!p) |
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| 19 | return 1; |
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| 20 | |
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| 21 | p = bpf_kptr_xchg(&v, p); |
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| 22 | if (p) |
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| 23 | goto release_out; |
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| 24 | |
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| 25 | /* Direct map value access of kptr, should be PTR_UNTRUSTED */ |
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| 26 | p = v; |
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| 27 | if (!p) |
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| 28 | return 1; |
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| 29 | |
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| 30 | asm volatile ( |
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| 31 | "r9 = %[p];" |
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| 32 | "%[sum] = 0;" |
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| 33 | |
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| 34 | /* r8 = p->a */ |
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| 35 | "r8 = *(u32 *)(r9 + 0);" |
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| 36 | "%[sum] += r8;" |
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| 37 | |
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| 38 | /* r8 = p->b */ |
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| 39 | "r8 = *(u32 *)(r9 + 4);" |
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| 40 | "%[sum] += r8;" |
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| 41 | |
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| 42 | "r9 += 8;" |
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| 43 | /* r9 = p->a */ |
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| 44 | "r9 = *(u32 *)(r9 - 8);" |
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| 45 | "%[sum] += r9;" |
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| 46 | |
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| 47 | : [sum] "=r" (sum) |
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| 48 | : [p] "r" (p) |
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| 49 | : "r8" , "r9" |
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| 50 | ); |
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| 51 | |
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| 52 | total_sum = sum; |
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| 53 | return 0; |
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| 54 | release_out: |
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| 55 | bpf_kfunc_call_test_release(p); |
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| 56 | return 1; |
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| 57 | } |
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| 58 | |
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| 59 | char _license[] SEC("license" ) = "GPL" ; |
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| 60 | |
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