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bpf: Add fd_array_cnt attribute for prog_load

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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 <aspsk@isovalent.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241213130934.1087929-5-aspsk@isovalent.com
This commit is contained in:
Anton Protopopov
2024-12-13 13:09:31 +00:00
committed by Andrii Nakryiko
parent 76145f7255
commit 4d3ae294f9
4 changed files with 112 additions and 16 deletions
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10
tools/include/uapi/linux/bpf.h
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@@ -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 */