125 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Converted from tools/testing/selftests/bpf/verifier/bpf_get_stack.c */3 4#include <linux/bpf.h>5#include <bpf/bpf_helpers.h>6#include "bpf_misc.h"7 8#define MAX_ENTRIES 119 10struct test_val {11 unsigned int index;12 int foo[MAX_ENTRIES];13};14 15struct {16 __uint(type, BPF_MAP_TYPE_ARRAY);17 __uint(max_entries, 1);18 __type(key, int);19 __type(value, struct test_val);20} map_array_48b SEC(".maps");21 22struct {23 __uint(type, BPF_MAP_TYPE_HASH);24 __uint(max_entries, 1);25 __type(key, long long);26 __type(value, struct test_val);27} map_hash_48b SEC(".maps");28 29SEC("tracepoint")30__description("bpf_get_stack return R0 within range")31__success32__naked void stack_return_r0_within_range(void)33{34 asm volatile (" \35 r6 = r1; \36 r1 = 0; \37 *(u64*)(r10 - 8) = r1; \38 r2 = r10; \39 r2 += -8; \40 r1 = %[map_hash_48b] ll; \41 call %[bpf_map_lookup_elem]; \42 if r0 == 0 goto l0_%=; \43 r7 = r0; \44 r9 = %[__imm_0]; \45 r1 = r6; \46 r2 = r7; \47 r3 = %[__imm_0]; \48 r4 = 256; \49 call %[bpf_get_stack]; \50 r1 = 0; \51 r8 = r0; \52 r8 <<= 32; \53 r8 s>>= 32; \54 if r1 s> r8 goto l0_%=; \55 r9 -= r8; \56 r2 = r7; \57 r2 += r8; \58 r1 = r9; \59 r1 <<= 32; \60 r1 s>>= 32; \61 r3 = r2; \62 r3 += r1; \63 r1 = r7; \64 r5 = %[__imm_0]; \65 r1 += r5; \66 if r3 >= r1 goto l0_%=; \67 r1 = r6; \68 r3 = r9; \69 r4 = 0; \70 call %[bpf_get_stack]; \71l0_%=: exit; \72" :73 : __imm(bpf_get_stack),74 __imm(bpf_map_lookup_elem),75 __imm_addr(map_hash_48b),76 __imm_const(__imm_0, sizeof(struct test_val) / 2)77 : __clobber_all);78}79 80SEC("iter/task")81__description("bpf_get_task_stack return R0 range is refined")82__success83__naked void return_r0_range_is_refined(void)84{85 asm volatile (" \86 r6 = *(u64*)(r1 + 0); \87 r6 = *(u64*)(r6 + 0); /* ctx->meta->seq */\88 r7 = *(u64*)(r1 + 8); /* ctx->task */\89 r1 = %[map_array_48b] ll; /* fixup_map_array_48b */\90 r2 = 0; \91 *(u64*)(r10 - 8) = r2; \92 r2 = r10; \93 r2 += -8; \94 call %[bpf_map_lookup_elem]; \95 if r0 != 0 goto l0_%=; \96 r0 = 0; \97 exit; \98l0_%=: if r7 != 0 goto l1_%=; \99 r0 = 0; \100 exit; \101l1_%=: r1 = r7; \102 r2 = r0; \103 r9 = r0; /* keep buf for seq_write */\104 r3 = 48; \105 r4 = 0; \106 call %[bpf_get_task_stack]; \107 if r0 s> 0 goto l2_%=; \108 r0 = 0; \109 exit; \110l2_%=: r1 = r6; \111 r2 = r9; \112 r3 = r0; \113 call %[bpf_seq_write]; \114 r0 = 0; \115 exit; \116" :117 : __imm(bpf_get_task_stack),118 __imm(bpf_map_lookup_elem),119 __imm(bpf_seq_write),120 __imm_addr(map_array_48b)121 : __clobber_all);122}123 124char _license[] SEC("license") = "GPL";125