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bc0e8faf90
Per-task restrictions apply to all rings created by a task. Once
installed, they should not be dropped across exec.
For a task that has used io_uring, the exec cancellation path calls
__io_uring_free(). This frees both the task context and the per-task
restriction, so a ring created after exec is unrestricted.
Split task context cleanup into io_uring_free_tctx(), and use it from
the exec cancellation path. Keep __io_uring_free() for final task
cleanup, where both the context and restriction are released.
Fixes: ed82f35b92 ("io_uring: allow registration of per-task restrictions")
Cc: stable@vger.kernel.org # 7.1+
Signed-off-by: Kyumin Lee <fyonglkm@gmail.com>
Link: https://patch.msgid.link/20260730192734.459247-1-fyonglkm@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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struct io_tctx_node {
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struct list_head ctx_node;
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struct task_struct *task;
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struct io_ring_ctx *ctx;
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};
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struct io_uring_task *io_uring_alloc_task_context(struct task_struct *task,
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struct io_ring_ctx *ctx);
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void io_uring_del_tctx_node(unsigned long index);
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int __io_uring_add_tctx_node(struct io_ring_ctx *ctx);
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int __io_uring_add_tctx_node_from_submit(struct io_ring_ctx *ctx);
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void io_uring_clean_tctx(struct io_uring_task *tctx);
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void io_uring_free_tctx(struct task_struct *tsk);
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void io_uring_unreg_ringfd(void);
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int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,
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unsigned nr_args);
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int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
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unsigned nr_args);
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/*
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* Note that this task has used io_uring. We use it for cancelation purposes.
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*/
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static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
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{
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struct io_uring_task *tctx = current->io_uring;
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if (likely(tctx && tctx->last == ctx))
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return 0;
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return __io_uring_add_tctx_node_from_submit(ctx);
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}
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