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