diff options
author | Hou Tao <houtao1@huawei.com> | 2021-12-03 13:30:01 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 10:53:54 +0100 |
commit | 924886fa2246d24d0f0f80096300f607f1b7a829 (patch) | |
tree | 7c0bf4796d9e6c3523d0249024907cb9c0f9abae /kernel/bpf/btf.c | |
parent | 218d952160f71bfc85cbad4a4834e0de306e4b77 (diff) |
bpf: Disallow BPF_LOG_KERNEL log level for bpf(BPF_BTF_LOAD)
[ Upstream commit 866de407444398bc8140ea70de1dba5f91cc34ac ]
BPF_LOG_KERNEL is only used internally, so disallow bpf_btf_load()
to set log level as BPF_LOG_KERNEL. The same checking has already
been done in bpf_check(), so factor out a helper to check the
validity of log attributes and use it in both places.
Fixes: 8580ac9404f6 ("bpf: Process in-kernel BTF")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20211203053001.740945-1-houtao1@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/bpf/btf.c')
-rw-r--r-- | kernel/bpf/btf.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 72534a6f4b96..dc497eaf2266 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4135,8 +4135,7 @@ static struct btf *btf_parse(void __user *btf_data, u32 btf_data_size, log->len_total = log_size; /* log attributes have to be sane */ - if (log->len_total < 128 || log->len_total > UINT_MAX >> 2 || - !log->level || !log->ubuf) { + if (!bpf_verifier_log_attr_valid(log)) { err = -EINVAL; goto errout; } |