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Merge branch 'bpf_func_info-improvements' 

Martin KaFai Lau says:

====================
The patchset has a few improvements on bpf_func_info:
1. Improvements on the behaviors of info.func_info, info.func_info_cnt
   and info.func_info_rec_size.
2. Name change: s/insn_offset/insn_off/

Please see individual patch for details.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2018-12-05 18:48:41 -08:00
parent 30da46b5dc 84ecc1f98c
commit a06aef4ed5
9 changed files with 53 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/uapi/linux/bpf.h
View File

@ -2991,7 +2991,7 @@ struct bpf_flow_keys {
};
struct bpf_func_info {
__u32 insn_offset;
__u32 insn_off;
__u32 type_id;
};

2
kernel/bpf/core.c
View File

@ -410,7 +410,7 @@ static void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
sym = bin2hex(sym, prog->tag, sizeof(prog->tag));
/* prog->aux->name will be ignored if full btf name is available */
if (prog->aux->btf) {
if (prog->aux->func_info_cnt) {
type = btf_type_by_id(prog->aux->btf,
prog->aux->func_info[prog->aux->func_idx].type_id);
func_name = btf_name_by_offset(prog->aux->btf, type->name_off);

44
kernel/bpf/syscall.c
View File

@ -2083,6 +2083,12 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
return -EFAULT;
}
if ((info.func_info_cnt || info.func_info_rec_size) &&
info.func_info_rec_size != sizeof(struct bpf_func_info))
return -EINVAL;
info.func_info_rec_size = sizeof(struct bpf_func_info);
if (!capable(CAP_SYS_ADMIN)) {
info.jited_prog_len = 0;
info.xlated_prog_len = 0;
@ -2226,35 +2232,23 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
}
}
if (prog->aux->btf) {
u32 krec_size = sizeof(struct bpf_func_info);
u32 ucnt, urec_size;
if (prog->aux->btf)
info.btf_id = btf_id(prog->aux->btf);
ucnt = info.func_info_cnt;
info.func_info_cnt = prog->aux->func_info_cnt;
urec_size = info.func_info_rec_size;
info.func_info_rec_size = krec_size;
if (ucnt) {
/* expect passed-in urec_size is what the kernel expects */
if (urec_size != info.func_info_rec_size)
return -EINVAL;
ulen = info.func_info_cnt;
info.func_info_cnt = prog->aux->func_info_cnt;
if (info.func_info_cnt && ulen) {
if (bpf_dump_raw_ok()) {
char __user *user_finfo;
if (bpf_dump_raw_ok()) {
char __user *user_finfo;
user_finfo = u64_to_user_ptr(info.func_info);
ucnt = min_t(u32, info.func_info_cnt, ucnt);
if (copy_to_user(user_finfo, prog->aux->func_info,
krec_size * ucnt))
return -EFAULT;
} else {
info.func_info_cnt = 0;
}
user_finfo = u64_to_user_ptr(info.func_info);
ulen = min_t(u32, info.func_info_cnt, ulen);
if (copy_to_user(user_finfo, prog->aux->func_info,
info.func_info_rec_size * ulen))
return -EFAULT;
} else {
info.func_info = 0;
}
} else {
info.func_info_cnt = 0;
}
done:

18
kernel/bpf/verifier.c
View File

@ -4707,24 +4707,24 @@ static int check_btf_func(struct bpf_prog *prog, struct bpf_verifier_env *env,
goto free_btf;
}
/* check insn_offset */
/* check insn_off */
if (i == 0) {
if (krecord[i].insn_offset) {
if (krecord[i].insn_off) {
verbose(env,
"nonzero insn_offset %u for the first func info record",
krecord[i].insn_offset);
"nonzero insn_off %u for the first func info record",
krecord[i].insn_off);
ret = -EINVAL;
goto free_btf;
}
} else if (krecord[i].insn_offset <= prev_offset) {
} else if (krecord[i].insn_off <= prev_offset) {
verbose(env,
"same or smaller insn offset (%u) than previous func info record (%u)",
krecord[i].insn_offset, prev_offset);
krecord[i].insn_off, prev_offset);
ret = -EINVAL;
goto free_btf;
}
if (env->subprog_info[i].start != krecord[i].insn_offset) {
if (env->subprog_info[i].start != krecord[i].insn_off) {
verbose(env, "func_info BTF section doesn't match subprog layout in BPF program\n");
ret = -EINVAL;
goto free_btf;
@ -4739,7 +4739,7 @@ static int check_btf_func(struct bpf_prog *prog, struct bpf_verifier_env *env,
goto free_btf;
}
prev_offset = krecord[i].insn_offset;
prev_offset = krecord[i].insn_off;
urecord += urec_size;
}
@ -4762,7 +4762,7 @@ static void adjust_btf_func(struct bpf_verifier_env *env)
return;
for (i = 0; i < env->subprog_cnt; i++)
env->prog->aux->func_info[i].insn_offset = env->subprog_info[i].start;
env->prog->aux->func_info[i].insn_off = env->subprog_info[i].start;
}
/* check %cur's range satisfies %old's */

7
tools/bpf/bpftool/prog.c
View File

@ -589,6 +589,13 @@ static int do_dump(int argc, char **argv)
goto err_free;
}
if (func_info && !info.func_info) {
/* kernel.kptr_restrict is set. No func_info available. */
free(func_info);
func_info = NULL;
finfo_cnt = 0;
}
if ((member_len == &info.jited_prog_len &&
info.jited_prog_insns == 0) ||
(member_len == &info.xlated_prog_len &&

4
tools/bpf/bpftool/xlated_dumper.c
View File

@ -261,7 +261,7 @@ void dump_xlated_json(struct dump_data *dd, void *buf, unsigned int len,
jsonw_start_object(json_wtr);
if (btf && record) {
if (record->insn_offset == i) {
if (record->insn_off == i) {
btf_dumper_type_only(btf, record->type_id,
func_sig,
sizeof(func_sig));
@ -330,7 +330,7 @@ void dump_xlated_plain(struct dump_data *dd, void *buf, unsigned int len,
}
if (btf && record) {
if (record->insn_offset == i) {
if (record->insn_off == i) {
btf_dumper_type_only(btf, record->type_id,
func_sig,
sizeof(func_sig));

2
tools/include/uapi/linux/bpf.h
View File

@ -2991,7 +2991,7 @@ struct bpf_flow_keys {
};
struct bpf_func_info {
__u32 insn_offset;
__u32 insn_off;
__u32 type_id;
};

12
tools/lib/bpf/btf.c
View File

@ -45,7 +45,7 @@ struct btf_ext {
/* The minimum bpf_func_info checked by the loader */
struct bpf_func_info_min {
__u32 insn_offset;
__u32 insn_off;
__u32 type_id;
};
@ -670,7 +670,7 @@ int btf_ext__reloc_init(struct btf *btf, struct btf_ext *btf_ext,
memcpy(data, sinfo->data, records_len);
/* adjust the insn_offset, the data in .BTF.ext is
/* adjust the insn_off, the data in .BTF.ext is
* the actual byte offset, and the kernel expects
* the offset in term of bpf_insn.
*
@ -681,7 +681,7 @@ int btf_ext__reloc_init(struct btf *btf, struct btf_ext *btf_ext,
struct bpf_func_info_min *record;
record = data + i * record_size;
record->insn_offset /= sizeof(struct bpf_insn);
record->insn_off /= sizeof(struct bpf_insn);
}
*func_info = data;
@ -722,15 +722,15 @@ int btf_ext__reloc(struct btf *btf, struct btf_ext *btf_ext,
return -ENOMEM;
memcpy(data + existing_flen, sinfo->data, records_len);
/* adjust insn_offset only, the rest data will be passed
/* adjust insn_off only, the rest data will be passed
* to the kernel.
*/
for (i = 0; i < sinfo->num_func_info; i++) {
struct bpf_func_info_min *record;
record = data + existing_flen + i * record_size;
record->insn_offset =
record->insn_offset / sizeof(struct bpf_insn) +
record->insn_off =
record->insn_off / sizeof(struct bpf_insn) +
insns_cnt;
}
*func_info = data;

8
tools/testing/selftests/bpf/test_btf.c
View File

@ -3156,7 +3156,7 @@ static struct btf_func_type_test {
},
{
.descr = "func_type (Incorrect bpf_func_info.insn_offset)",
.descr = "func_type (Incorrect bpf_func_info.insn_off)",
.raw_types = {
BTF_TYPE_INT_ENC(NAME_TBD, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_TYPE_INT_ENC(NAME_TBD, 0, 0, 32, 4), /* [2] */
@ -3303,6 +3303,12 @@ static int do_test_func_type(int test_num)
goto done;
}
if (CHECK(!info.func_info,
"info.func_info == 0. kernel.kptr_restrict is set?")) {
err = -1;
goto done;
}
finfo = func_info;
for (i = 0; i < 2; i++) {
if (CHECK(finfo->type_id != test->func_info[i][1],