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bpf: Fix bpf_attr.attach_btf_id check 

Only raw_tracepoint program type can have bpf_attr.attach_btf_id >= 0.
Make sure to reject other program types that accidentally set it to non-zero.

Fixes: ccfe29eb29 ("bpf: Add attach_btf_id attribute to program load")
Reported-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20191018060933.2950231-1-ast@kernel.org
This commit is contained in:
Alexei Starovoitov 2019-10-17 23:09:33 -07:00 committed by Daniel Borkmann
parent 47a92ae074
commit c108e3c1bd
1 changed files with 11 additions and 6 deletions
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17
kernel/bpf/syscall.c
View File

@ -1570,6 +1570,17 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
enum bpf_attach_type expected_attach_type,
u32 btf_id)
{
switch (prog_type) {
case BPF_PROG_TYPE_RAW_TRACEPOINT:
if (btf_id > BTF_MAX_TYPE)
return -EINVAL;
break;
default:
if (btf_id)
return -EINVAL;
break;
}
switch (prog_type) {
case BPF_PROG_TYPE_CGROUP_SOCK:
switch (expected_attach_type) {
@ -1610,13 +1621,7 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
default:
return -EINVAL;
}
case BPF_PROG_TYPE_RAW_TRACEPOINT:
if (btf_id > BTF_MAX_TYPE)
return -EINVAL;
return 0;
default:
if (btf_id)
return -EINVAL;
return 0;
}
}