111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/* Converted from tools/testing/selftests/bpf/verifier/map_ret_val.c */
|
||
|
|
|
||
|
|
#include <linux/bpf.h>
|
||
|
|
#include <bpf/bpf_helpers.h>
|
||
|
|
#include "../../../include/linux/filter.h"
|
||
|
|
#include "bpf_misc.h"
|
||
|
|
|
||
|
|
struct {
|
||
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
||
|
|
__uint(max_entries, 1);
|
||
|
|
__type(key, long long);
|
||
|
|
__type(value, long long);
|
||
|
|
} map_hash_8b SEC(".maps");
|
||
|
|
|
||
|
|
SEC("socket")
|
||
|
|
__description("invalid map_fd for function call")
|
||
|
|
__failure __msg("fd 0 is not pointing to valid bpf_map")
|
||
|
|
__failure_unpriv
|
||
|
|
__naked void map_fd_for_function_call(void)
|
||
|
|
{
|
||
|
|
asm volatile (" \
|
||
|
|
r2 = 0; \
|
||
|
|
*(u64*)(r10 - 8) = r2; \
|
||
|
|
r2 = r10; \
|
||
|
|
r2 += -8; \
|
||
|
|
.8byte %[ld_map_fd]; \
|
||
|
|
.8byte 0; \
|
||
|
|
call %[bpf_map_delete_elem]; \
|
||
|
|
exit; \
|
||
|
|
" :
|
||
|
|
: __imm(bpf_map_delete_elem),
|
||
|
|
__imm_insn(ld_map_fd, BPF_RAW_INSN(BPF_LD | BPF_DW | BPF_IMM, BPF_REG_1, BPF_PSEUDO_MAP_FD, 0, 0))
|
||
|
|
: __clobber_all);
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("socket")
|
||
|
|
__description("don't check return value before access")
|
||
|
|
__failure __msg("R0 invalid mem access 'map_value_or_null'")
|
||
|
|
__failure_unpriv
|
||
|
|
__naked void check_return_value_before_access(void)
|
||
|
|
{
|
||
|
|
asm volatile (" \
|
||
|
|
r1 = 0; \
|
||
|
|
*(u64*)(r10 - 8) = r1; \
|
||
|
|
r2 = r10; \
|
||
|
|
r2 += -8; \
|
||
|
|
r1 = %[map_hash_8b] ll; \
|
||
|
|
call %[bpf_map_lookup_elem]; \
|
||
|
|
r1 = 0; \
|
||
|
|
*(u64*)(r0 + 0) = r1; \
|
||
|
|
exit; \
|
||
|
|
" :
|
||
|
|
: __imm(bpf_map_lookup_elem),
|
||
|
|
__imm_addr(map_hash_8b)
|
||
|
|
: __clobber_all);
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("socket")
|
||
|
|
__description("access memory with incorrect alignment")
|
||
|
|
__failure __msg("misaligned value access")
|
||
|
|
__failure_unpriv
|
||
|
|
__flag(BPF_F_STRICT_ALIGNMENT)
|
||
|
|
__naked void access_memory_with_incorrect_alignment_1(void)
|
||
|
|
{
|
||
|
|
asm volatile (" \
|
||
|
|
r1 = 0; \
|
||
|
|
*(u64*)(r10 - 8) = r1; \
|
||
|
|
r2 = r10; \
|
||
|
|
r2 += -8; \
|
||
|
|
r1 = %[map_hash_8b] ll; \
|
||
|
|
call %[bpf_map_lookup_elem]; \
|
||
|
|
if r0 == 0 goto l0_%=; \
|
||
|
|
r1 = 0; \
|
||
|
|
*(u64*)(r0 + 4) = r1; \
|
||
|
|
l0_%=: exit; \
|
||
|
|
" :
|
||
|
|
: __imm(bpf_map_lookup_elem),
|
||
|
|
__imm_addr(map_hash_8b)
|
||
|
|
: __clobber_all);
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("socket")
|
||
|
|
__description("sometimes access memory with incorrect alignment")
|
||
|
|
__failure __msg("R0 invalid mem access")
|
||
|
|
__msg_unpriv("R0 leaks addr")
|
||
|
|
__flag(BPF_F_STRICT_ALIGNMENT)
|
||
|
|
__naked void access_memory_with_incorrect_alignment_2(void)
|
||
|
|
{
|
||
|
|
asm volatile (" \
|
||
|
|
r1 = 0; \
|
||
|
|
*(u64*)(r10 - 8) = r1; \
|
||
|
|
r2 = r10; \
|
||
|
|
r2 += -8; \
|
||
|
|
r1 = %[map_hash_8b] ll; \
|
||
|
|
call %[bpf_map_lookup_elem]; \
|
||
|
|
if r0 == 0 goto l0_%=; \
|
||
|
|
r1 = 0; \
|
||
|
|
*(u64*)(r0 + 0) = r1; \
|
||
|
|
exit; \
|
||
|
|
l0_%=: r1 = 1; \
|
||
|
|
*(u64*)(r0 + 0) = r1; \
|
||
|
|
exit; \
|
||
|
|
" :
|
||
|
|
: __imm(bpf_map_lookup_elem),
|
||
|
|
__imm_addr(map_hash_8b)
|
||
|
|
: __clobber_all);
|
||
|
|
}
|
||
|
|
|
||
|
|
char _license[] SEC("license") = "GPL";
|