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selftests/bpf: Add test for strict BTF type check

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Ensure that the edge case where first member type was matched
successfully even if it didn't match BTF type of register is caught and
rejected by the verifier.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220424214901.2743946-14-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi 2022-04-25 03:19:01 +05:30 committed by Alexei Starovoitov
parent 05a945deef
commit 792c0a345f
2 changed files with 41 additions and 1 deletions
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22
net/bpf/test_run.c
View file

@ -550,8 +550,13 @@ struct sock * noinline bpf_kfunc_call_test3(struct sock *sk)
return sk;
}
struct prog_test_member1 {
int a;
};
struct prog_test_member {
u64 c;
struct prog_test_member1 m;
int c;
};
struct prog_test_ref_kfunc {
@ -576,6 +581,12 @@ bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr)
return &prog_test_struct;
}
noinline struct prog_test_member *
bpf_kfunc_call_memb_acquire(void)
{
return &prog_test_struct.memb;
}
noinline void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
{
}
@ -584,6 +595,10 @@ noinline void bpf_kfunc_call_memb_release(struct prog_test_member *p)
{
}
noinline void bpf_kfunc_call_memb1_release(struct prog_test_member1 *p)
{
}
noinline struct prog_test_ref_kfunc *
bpf_kfunc_call_test_kptr_get(struct prog_test_ref_kfunc **p, int a, int b)
{
@ -673,8 +688,10 @@ BTF_ID(func, bpf_kfunc_call_test1)
BTF_ID(func, bpf_kfunc_call_test2)
BTF_ID(func, bpf_kfunc_call_test3)
BTF_ID(func, bpf_kfunc_call_test_acquire)
BTF_ID(func, bpf_kfunc_call_memb_acquire)
BTF_ID(func, bpf_kfunc_call_test_release)
BTF_ID(func, bpf_kfunc_call_memb_release)
BTF_ID(func, bpf_kfunc_call_memb1_release)
BTF_ID(func, bpf_kfunc_call_test_kptr_get)
BTF_ID(func, bpf_kfunc_call_test_pass_ctx)
BTF_ID(func, bpf_kfunc_call_test_pass1)
@ -689,16 +706,19 @@ BTF_SET_END(test_sk_check_kfunc_ids)
BTF_SET_START(test_sk_acquire_kfunc_ids)
BTF_ID(func, bpf_kfunc_call_test_acquire)
BTF_ID(func, bpf_kfunc_call_memb_acquire)
BTF_ID(func, bpf_kfunc_call_test_kptr_get)
BTF_SET_END(test_sk_acquire_kfunc_ids)
BTF_SET_START(test_sk_release_kfunc_ids)
BTF_ID(func, bpf_kfunc_call_test_release)
BTF_ID(func, bpf_kfunc_call_memb_release)
BTF_ID(func, bpf_kfunc_call_memb1_release)
BTF_SET_END(test_sk_release_kfunc_ids)
BTF_SET_START(test_sk_ret_null_kfunc_ids)
BTF_ID(func, bpf_kfunc_call_test_acquire)
BTF_ID(func, bpf_kfunc_call_memb_acquire)
BTF_ID(func, bpf_kfunc_call_test_kptr_get)
BTF_SET_END(test_sk_ret_null_kfunc_ids)

20
tools/testing/selftests/bpf/verifier/calls.c
View file

@ -138,6 +138,26 @@
{ "bpf_kfunc_call_memb_release", 8 },
},
},
{
"calls: invalid kfunc call: don't match first member type when passed to release kfunc",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = REJECT,
.errstr = "kernel function bpf_kfunc_call_memb1_release args#0 expected pointer",
.fixup_kfunc_btf_id = {
{ "bpf_kfunc_call_memb_acquire", 1 },
{ "bpf_kfunc_call_memb1_release", 5 },
},
},
{
"calls: invalid kfunc call: PTR_TO_BTF_ID with negative offset",
.insns = {