luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

bpf: btf: Fix end boundary calculation for type section

Browse Source 
The end boundary math for type section is incorrect in
btf_check_all_metas().  It just happens that hdr->type_off
is always 0 for now because there are only two sections
(type and string) and string section must be at the end (ensured
in btf_parse_str_sec).

However, type_off may not be 0 if a new section would be added later.
This patch fixes it.

Fixes: f80442a4cd ("bpf: btf: Change how section is supported in btf_header")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Martin KaFai Lau 2018-09-12 10:29:11 -07:00 committed by Daniel Borkmann
parent cc4dfb7f70
commit 4b1c5d917d
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/bpf/btf.c
View File

@ -1844,7 +1844,7 @@ static int btf_check_all_metas(struct btf_verifier_env *env)
hdr = &btf->hdr;
cur = btf->nohdr_data + hdr->type_off;
end = btf->nohdr_data + hdr->type_len;
end = cur + hdr->type_len;
env->log_type_id = 1;
while (cur < end) {