Messages in this thread Patch in this message | | | From | Edward Adam Davis <> | Subject | [PATCH bpf-next] bpf: fix oob in btf_name_valid_section | Date | Mon, 11 Mar 2024 21:16:59 +0800 |
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Check the first char of the BTF DATASEC names.
Fixes: bd70a8fb7ca4 ("bpf: Allow all printable characters in BTF DATASEC names") Reported-and-tested-by: syzbot+cc32304f6487ebff9b70@syzkaller.appspotmail.com Signed-off-by: Edward Adam Davis <eadavis@qq.com> --- kernel/bpf/btf.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 170d017e8e4a..dda0aa0d7175 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -816,6 +816,8 @@ static bool btf_name_valid_section(const struct btf *btf, u32 offset) const char *src = btf_str_by_offset(btf, offset); const char *src_limit; + if (!isprint(*src)) + return false; /* set a limit on identifier length */ src_limit = src + KSYM_NAME_LEN; src++; -- 2.43.0
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