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| author | Martin KaFai Lau <kafai@fb.com> | 2018-09-12 10:29:11 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-09-12 22:00:23 +0200 |
| commit | 4b1c5d917d34f705096bb7dd8a2bd19b0881970e (patch) | |
| tree | f612c951bf03bb81ffa2c8dd393f39781b7fc739 /kernel | |
| parent | cc4dfb7f70a344f24c1c71e298deea0771dadcb2 (diff) | |
| download | linux-0-day-4b1c5d917d34f705096bb7dd8a2bd19b0881970e.tar.gz linux-0-day-4b1c5d917d34f705096bb7dd8a2bd19b0881970e.tar.xz | |
bpf: btf: Fix end boundary calculation for type section
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: f80442a4cd18 ("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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/btf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 2590700237c13..138f0302692ec 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -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) { |