Quelle  verifier_value.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/value.c */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

#define MAX_ENTRIES 11

struct test_val {
 unsigned int index;
 int foo[MAX_ENTRIES];
};

struct {
 __uint(type, BPF_MAP_TYPE_HASH);
 __uint(max_entries, 1);
 __type(key, long long);
 __type(value, struct test_val);
} map_hash_48b SEC(".maps");

SEC("socket")
__description("map element value store of cleared call register")
__failure __msg("R1 !read_ok")
__failure_unpriv __msg_unpriv("R1 !read_ok")
__naked void store_of_cleared_call_register(void)
{
 asm volatile (" \
 r2 = r10;     \
 r2 += -8;     \
 r1 = 0;      \
 *(u64*)(r2 + 0) = r1;    \
 r1 = %[map_hash_48b] ll;   \
 call %[bpf_map_lookup_elem];   \
 if r0 == 0 goto l0_%=;    \
 *(u64*)(r0 + 0) = r1;    \
l0_%=: exit;      \
" :
 : __imm(bpf_map_lookup_elem),
   __imm_addr(map_hash_48b)
 : __clobber_all);
}

SEC("socket")
__description("map element value with unaligned store")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void element_value_with_unaligned_store(void)
{
 asm volatile (" \
 r2 = r10;     \
 r2 += -8;     \
 r1 = 0;      \
 *(u64*)(r2 + 0) = r1;    \
 r1 = %[map_hash_48b] ll;   \
 call %[bpf_map_lookup_elem];   \
 if r0 == 0 goto l0_%=;    \
 r0 += 3;     \
 r1 = 42;     \
 *(u64*)(r0 + 0) = r1;    \
 r1 = 43;     \
 *(u64*)(r0 + 2) = r1;    \
 r1 = 44;     \
 *(u64*)(r0 - 2) = r1;    \
 r8 = r0;     \
 r1 = 32;     \
 *(u64*)(r8 + 0) = r1;    \
 r1 = 33;     \
 *(u64*)(r8 + 2) = r1;    \
 r1 = 34;     \
 *(u64*)(r8 - 2) = r1;    \
 r8 += 5;     \
 r1 = 22;     \
 *(u64*)(r8 + 0) = r1;    \
 r1 = 23;     \
 *(u64*)(r8 + 4) = r1;    \
 r1 = 24;     \
 *(u64*)(r8 - 7) = r1;    \
 r7 = r8;     \
 r7 += 3;     \
 r1 = 22;     \
 *(u64*)(r7 + 0) = r1;    \
 r1 = 23;     \
 *(u64*)(r7 + 4) = r1;    \
 r1 = 24;     \
 *(u64*)(r7 - 4) = r1;    \
l0_%=: exit;      \
" :
 : __imm(bpf_map_lookup_elem),
   __imm_addr(map_hash_48b)
 : __clobber_all);
}

SEC("socket")
__description("map element value with unaligned load")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void element_value_with_unaligned_load(void)
{
 asm volatile (" \
 r2 = r10;     \
 r2 += -8;     \
 r1 = 0;      \
 *(u64*)(r2 + 0) = r1;    \
 r1 = %[map_hash_48b] ll;   \
 call %[bpf_map_lookup_elem];   \
 if r0 == 0 goto l0_%=;    \
 r1 = *(u32*)(r0 + 0);    \
 if r1 >= %[max_entries] goto l0_%=;  \
 r0 += 3;     \
 r7 = *(u64*)(r0 + 0);    \
 r7 = *(u64*)(r0 + 2);    \
 r8 = r0;     \
 r7 = *(u64*)(r8 + 0);    \
 r7 = *(u64*)(r8 + 2);    \
 r0 += 5;     \
 r7 = *(u64*)(r0 + 0);    \
 r7 = *(u64*)(r0 + 4);    \
l0_%=: exit;      \
" :
 : __imm(bpf_map_lookup_elem),
   __imm_addr(map_hash_48b),
   __imm_const(max_entries, MAX_ENTRIES)
 : __clobber_all);
}

SEC("socket")
__description("map element value is preserved across register spilling")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void is_preserved_across_register_spilling(void)
{
 asm volatile (" \
 r2 = r10;     \
 r2 += -8;     \
 r1 = 0;      \
 *(u64*)(r2 + 0) = r1;    \
 r1 = %[map_hash_48b] ll;   \
 call %[bpf_map_lookup_elem];   \
 if r0 == 0 goto l0_%=;    \
 r0 += %[test_val_foo];    \
 r1 = 42;     \
 *(u64*)(r0 + 0) = r1;    \
 r1 = r10;     \
 r1 += -184;     \
 *(u64*)(r1 + 0) = r0;    \
 r3 = *(u64*)(r1 + 0);    \
 r1 = 42;     \
 *(u64*)(r3 + 0) = r1;    \
l0_%=: exit;      \
" :
 : __imm(bpf_map_lookup_elem),
   __imm_addr(map_hash_48b),
   __imm_const(test_val_foo, offsetof(struct test_val, foo))
 : __clobber_all);
}

char _license[] SEC("license") = "GPL";