[RFC 5/9] bpf: introduce CHECK_ATTR_TAIL
From: Lorenz Bauer <hidden>
Date: 2021-10-14 14:35:02
Subsystem:
bpf [core], bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
--- kernel/bpf/syscall.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 4e50c0bfdb7d..14c2cfe6ef38 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c@@ -719,6 +719,10 @@ int bpf_get_file_flag(int flags) offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ sizeof(attr->CMD##_LAST_FIELD)) != NULL +#define CHECK_ATTR_TAIL(attr, field) \ + (memchr_inv((void *)(attr) + offsetofend(typeof(*attr), field), 0, \ + sizeof(*(attr)) - offsetofend(typeof(*attr), field)) != NULL ? -EINVAL : 0) + /* dst and src must have at least "size" number of bytes. * Return strlen on success and < 0 on error. */
--
2.30.2