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bpf: Simplify ptr_min_max_vals adjustment 

An upcoming commit will add another two pointer types that need very
similar behaviour, so generalise this function now.

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Joe Stringer 2018-10-02 13:35:30 -07:00 committed by Daniel Borkmann
parent f3709f69b7
commit aad2eeaf46
2 changed files with 17 additions and 19 deletions
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22
kernel/bpf/verifier.c
View File

@ -2669,20 +2669,18 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
return -EACCES;
}
if (ptr_reg->type == PTR_TO_MAP_VALUE_OR_NULL) {
verbose(env, "R%d pointer arithmetic on PTR_TO_MAP_VALUE_OR_NULL prohibited, null-check it first\n",
dst);
switch (ptr_reg->type) {
case PTR_TO_MAP_VALUE_OR_NULL:
verbose(env, "R%d pointer arithmetic on %s prohibited, null-check it first\n",
dst, reg_type_str[ptr_reg->type]);
return -EACCES;
}
if (ptr_reg->type == CONST_PTR_TO_MAP) {
verbose(env, "R%d pointer arithmetic on CONST_PTR_TO_MAP prohibited\n",
dst);
return -EACCES;
}
if (ptr_reg->type == PTR_TO_PACKET_END) {
verbose(env, "R%d pointer arithmetic on PTR_TO_PACKET_END prohibited\n",
dst);
case CONST_PTR_TO_MAP:
case PTR_TO_PACKET_END:
verbose(env, "R%d pointer arithmetic on %s prohibited\n",
dst, reg_type_str[ptr_reg->type]);
return -EACCES;
default:
break;
}
/* In case of 'scalar += pointer', dst_reg inherits pointer type and id.

14
tools/testing/selftests/bpf/test_verifier.c
View File

@ -3638,7 +3638,7 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "R3 pointer arithmetic on PTR_TO_PACKET_END",
.errstr = "R3 pointer arithmetic on pkt_end",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
@ -4896,7 +4896,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.fixup_map1 = { 4 },
.errstr = "R4 pointer arithmetic on PTR_TO_MAP_VALUE_OR_NULL",
.errstr = "R4 pointer arithmetic on map_value_or_null",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
@ -4917,7 +4917,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.fixup_map1 = { 4 },
.errstr = "R4 pointer arithmetic on PTR_TO_MAP_VALUE_OR_NULL",
.errstr = "R4 pointer arithmetic on map_value_or_null",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
@ -4938,7 +4938,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.fixup_map1 = { 4 },
.errstr = "R4 pointer arithmetic on PTR_TO_MAP_VALUE_OR_NULL",
.errstr = "R4 pointer arithmetic on map_value_or_null",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS
},
@ -7253,7 +7253,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.fixup_map_in_map = { 3 },
.errstr = "R1 pointer arithmetic on CONST_PTR_TO_MAP prohibited",
.errstr = "R1 pointer arithmetic on map_ptr prohibited",
.result = REJECT,
},
{
@ -8927,7 +8927,7 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "R3 pointer arithmetic on PTR_TO_PACKET_END",
.errstr = "R3 pointer arithmetic on pkt_end",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_XDP,
},
@ -8946,7 +8946,7 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "R3 pointer arithmetic on PTR_TO_PACKET_END",
.errstr = "R3 pointer arithmetic on pkt_end",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_XDP,
},