From 4d3ae294f900fb7232fb6c890dbd3176b8a5f121 Mon Sep 17 00:00:00 2001 From: Anton Protopopov Date: Fri, 13 Dec 2024 13:09:31 +0000 Subject: bpf: Add fd_array_cnt attribute for prog_load The fd_array attribute of the BPF_PROG_LOAD syscall may contain a set of file descriptors: maps or btfs. This field was introduced as a sparse array. Introduce a new attribute, fd_array_cnt, which, if present, indicates that the fd_array is a continuous array of the corresponding length. If fd_array_cnt is non-zero, then every map in the fd_array will be bound to the program, as if it was used by the program. This functionality is similar to the BPF_PROG_BIND_MAP syscall, but such maps can be used by the verifier during the program load. Signed-off-by: Anton Protopopov Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20241213130934.1087929-5-aspsk@isovalent.com --- tools/include/uapi/linux/bpf.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'tools/include/uapi/linux') diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 4162afc6b5d0..2acf9b336371 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -1573,6 +1573,16 @@ union bpf_attr { * If provided, prog_flags should have BPF_F_TOKEN_FD flag set. */ __s32 prog_token_fd; + /* The fd_array_cnt can be used to pass the length of the + * fd_array array. In this case all the [map] file descriptors + * passed in this array will be bound to the program, even if + * the maps are not referenced directly. The functionality is + * similar to the BPF_PROG_BIND_MAP syscall, but maps can be + * used by the verifier during the program load. If provided, + * then the fd_array[0,...,fd_array_cnt-1] is expected to be + * continuous. + */ + __u32 fd_array_cnt; }; struct { /* anonymous struct used by BPF_OBJ_* commands */ -- cgit v1.2.3