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io_uring/bpf_filter: allow filtering on contents of struct open_how

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This adds custom filtering for IORING_OP_OPENAT and IORING_OP_OPENAT2,
where the open_how flags, mode, and resolve can be checked by filters.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2026-01-19 15:59:54 -07:00
parent cff1c26b42
commit 8768770cf5
4 changed files with 23 additions and 0 deletions
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5
include/uapi/linux/io_uring/bpf_filter.h
View file

@ -22,6 +22,11 @@ struct io_uring_bpf_ctx {
__u32 type;
__u32 protocol;
} socket;
struct {
__u64 flags;
__u64 mode;
__u64 resolve;
} open;
};
};

6
io_uring/bpf_filter.c
View file

@ -12,6 +12,7 @@
#include "io_uring.h"
#include "bpf_filter.h"
#include "net.h"
#include "openclose.h"
struct io_bpf_filter {
struct bpf_prog *prog;
@ -40,6 +41,11 @@ static void io_uring_populate_bpf_ctx(struct io_uring_bpf_ctx *bctx,
bctx->pdu_size = sizeof(bctx->socket);
io_socket_bpf_populate(bctx, req);
break;
case IORING_OP_OPENAT:
case IORING_OP_OPENAT2:
bctx->pdu_size = sizeof(bctx->open);
io_openat_bpf_populate(bctx, req);
break;
}
}

9
io_uring/openclose.c
View file

@ -85,6 +85,15 @@ static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
return 0;
}
void io_openat_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req)
{
struct io_open *open = io_kiocb_to_cmd(req, struct io_open);
bctx->open.flags = open->how.flags;
bctx->open.mode = open->how.mode;
bctx->open.resolve = open->how.resolve;
}
int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_open *open = io_kiocb_to_cmd(req, struct io_open);

3
io_uring/openclose.h
View file

@ -1,11 +1,14 @@
// SPDX-License-Identifier: GPL-2.0
#include "bpf_filter.h"
int __io_close_fixed(struct io_ring_ctx *ctx, unsigned int issue_flags,
unsigned int offset);
int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_openat(struct io_kiocb *req, unsigned int issue_flags);
void io_open_cleanup(struct io_kiocb *req);
void io_openat_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req);
int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_openat2(struct io_kiocb *req, unsigned int issue_flags);