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https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
![Hagar Hemdan](/assets/img/avatar_default.png)
The io_register_iowq_max_workers() function calls io_put_sq_data(),
which acquires the sqd->lock without releasing the uring_lock.
Similar to the commit 009ad9f0c6
("io_uring: drop ctx->uring_lock
before acquiring sqd->lock"), this can lead to a potential deadlock
situation.
To resolve this issue, the uring_lock is released before calling
io_put_sq_data(), and then it is re-acquired after the function call.
This change ensures that the locks are acquired in the correct
order, preventing the possibility of a deadlock.
Suggested-by: Maximilian Heyne <mheyne@amazon.de>
Signed-off-by: Hagar Hemdan <hagarhem@amazon.com>
Link: https://lore.kernel.org/r/20240604130527.3597-1-hagarhem@amazon.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
624 lines
14 KiB
C
624 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Code related to the io_uring_register() syscall
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*
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* Copyright (C) 2023 Jens Axboe
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/syscalls.h>
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#include <linux/refcount.h>
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#include <linux/bits.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/nospec.h>
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#include <linux/compat.h>
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#include <linux/io_uring.h>
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#include <linux/io_uring_types.h>
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#include "io_uring.h"
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#include "opdef.h"
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#include "tctx.h"
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#include "rsrc.h"
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#include "sqpoll.h"
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#include "register.h"
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#include "cancel.h"
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#include "kbuf.h"
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#include "napi.h"
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#define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \
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IORING_REGISTER_LAST + IORING_OP_LAST)
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static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg,
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unsigned int eventfd_async)
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{
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struct io_ev_fd *ev_fd;
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__s32 __user *fds = arg;
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int fd;
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ev_fd = rcu_dereference_protected(ctx->io_ev_fd,
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lockdep_is_held(&ctx->uring_lock));
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if (ev_fd)
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return -EBUSY;
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if (copy_from_user(&fd, fds, sizeof(*fds)))
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return -EFAULT;
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ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL);
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if (!ev_fd)
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return -ENOMEM;
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ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd);
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if (IS_ERR(ev_fd->cq_ev_fd)) {
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int ret = PTR_ERR(ev_fd->cq_ev_fd);
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kfree(ev_fd);
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return ret;
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}
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spin_lock(&ctx->completion_lock);
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ctx->evfd_last_cq_tail = ctx->cached_cq_tail;
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spin_unlock(&ctx->completion_lock);
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ev_fd->eventfd_async = eventfd_async;
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ctx->has_evfd = true;
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rcu_assign_pointer(ctx->io_ev_fd, ev_fd);
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atomic_set(&ev_fd->refs, 1);
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atomic_set(&ev_fd->ops, 0);
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return 0;
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}
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int io_eventfd_unregister(struct io_ring_ctx *ctx)
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{
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struct io_ev_fd *ev_fd;
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ev_fd = rcu_dereference_protected(ctx->io_ev_fd,
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lockdep_is_held(&ctx->uring_lock));
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if (ev_fd) {
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ctx->has_evfd = false;
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rcu_assign_pointer(ctx->io_ev_fd, NULL);
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if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_FREE_BIT), &ev_fd->ops))
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call_rcu(&ev_fd->rcu, io_eventfd_ops);
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return 0;
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}
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return -ENXIO;
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}
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static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg,
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unsigned nr_args)
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{
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struct io_uring_probe *p;
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size_t size;
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int i, ret;
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size = struct_size(p, ops, nr_args);
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if (size == SIZE_MAX)
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return -EOVERFLOW;
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p = kzalloc(size, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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ret = -EFAULT;
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if (copy_from_user(p, arg, size))
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goto out;
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ret = -EINVAL;
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if (memchr_inv(p, 0, size))
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goto out;
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p->last_op = IORING_OP_LAST - 1;
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if (nr_args > IORING_OP_LAST)
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nr_args = IORING_OP_LAST;
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for (i = 0; i < nr_args; i++) {
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p->ops[i].op = i;
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if (!io_issue_defs[i].not_supported)
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p->ops[i].flags = IO_URING_OP_SUPPORTED;
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}
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p->ops_len = i;
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ret = 0;
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if (copy_to_user(arg, p, size))
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ret = -EFAULT;
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out:
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kfree(p);
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return ret;
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}
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int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
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{
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const struct cred *creds;
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creds = xa_erase(&ctx->personalities, id);
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if (creds) {
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put_cred(creds);
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return 0;
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}
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return -EINVAL;
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}
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static int io_register_personality(struct io_ring_ctx *ctx)
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{
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const struct cred *creds;
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u32 id;
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int ret;
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creds = get_current_cred();
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ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds,
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XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL);
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if (ret < 0) {
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put_cred(creds);
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return ret;
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}
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return id;
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}
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static __cold int io_register_restrictions(struct io_ring_ctx *ctx,
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void __user *arg, unsigned int nr_args)
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{
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struct io_uring_restriction *res;
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size_t size;
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int i, ret;
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/* Restrictions allowed only if rings started disabled */
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if (!(ctx->flags & IORING_SETUP_R_DISABLED))
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return -EBADFD;
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/* We allow only a single restrictions registration */
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if (ctx->restrictions.registered)
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return -EBUSY;
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if (!arg || nr_args > IORING_MAX_RESTRICTIONS)
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return -EINVAL;
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size = array_size(nr_args, sizeof(*res));
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if (size == SIZE_MAX)
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return -EOVERFLOW;
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res = memdup_user(arg, size);
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if (IS_ERR(res))
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return PTR_ERR(res);
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ret = 0;
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for (i = 0; i < nr_args; i++) {
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switch (res[i].opcode) {
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case IORING_RESTRICTION_REGISTER_OP:
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if (res[i].register_op >= IORING_REGISTER_LAST) {
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ret = -EINVAL;
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goto out;
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}
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__set_bit(res[i].register_op,
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ctx->restrictions.register_op);
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break;
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case IORING_RESTRICTION_SQE_OP:
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if (res[i].sqe_op >= IORING_OP_LAST) {
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ret = -EINVAL;
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goto out;
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}
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__set_bit(res[i].sqe_op, ctx->restrictions.sqe_op);
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break;
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case IORING_RESTRICTION_SQE_FLAGS_ALLOWED:
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ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags;
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break;
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case IORING_RESTRICTION_SQE_FLAGS_REQUIRED:
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ctx->restrictions.sqe_flags_required = res[i].sqe_flags;
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break;
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default:
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ret = -EINVAL;
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goto out;
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}
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}
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out:
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/* Reset all restrictions if an error happened */
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if (ret != 0)
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memset(&ctx->restrictions, 0, sizeof(ctx->restrictions));
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else
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ctx->restrictions.registered = true;
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kfree(res);
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return ret;
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}
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static int io_register_enable_rings(struct io_ring_ctx *ctx)
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{
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if (!(ctx->flags & IORING_SETUP_R_DISABLED))
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return -EBADFD;
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if (ctx->flags & IORING_SETUP_SINGLE_ISSUER && !ctx->submitter_task) {
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WRITE_ONCE(ctx->submitter_task, get_task_struct(current));
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/*
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* Lazy activation attempts would fail if it was polled before
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* submitter_task is set.
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*/
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if (wq_has_sleeper(&ctx->poll_wq))
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io_activate_pollwq(ctx);
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}
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if (ctx->restrictions.registered)
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ctx->restricted = 1;
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ctx->flags &= ~IORING_SETUP_R_DISABLED;
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if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait))
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wake_up(&ctx->sq_data->wait);
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return 0;
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}
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static __cold int __io_register_iowq_aff(struct io_ring_ctx *ctx,
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cpumask_var_t new_mask)
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{
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int ret;
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if (!(ctx->flags & IORING_SETUP_SQPOLL)) {
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ret = io_wq_cpu_affinity(current->io_uring, new_mask);
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} else {
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mutex_unlock(&ctx->uring_lock);
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ret = io_sqpoll_wq_cpu_affinity(ctx, new_mask);
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mutex_lock(&ctx->uring_lock);
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}
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return ret;
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}
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static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx,
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void __user *arg, unsigned len)
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{
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cpumask_var_t new_mask;
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int ret;
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if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
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return -ENOMEM;
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cpumask_clear(new_mask);
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if (len > cpumask_size())
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len = cpumask_size();
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#ifdef CONFIG_COMPAT
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if (in_compat_syscall())
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ret = compat_get_bitmap(cpumask_bits(new_mask),
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(const compat_ulong_t __user *)arg,
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len * 8 /* CHAR_BIT */);
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else
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#endif
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ret = copy_from_user(new_mask, arg, len);
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if (ret) {
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free_cpumask_var(new_mask);
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return -EFAULT;
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}
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ret = __io_register_iowq_aff(ctx, new_mask);
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free_cpumask_var(new_mask);
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return ret;
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}
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static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx)
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{
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return __io_register_iowq_aff(ctx, NULL);
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}
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static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
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void __user *arg)
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__must_hold(&ctx->uring_lock)
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{
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struct io_tctx_node *node;
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struct io_uring_task *tctx = NULL;
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struct io_sq_data *sqd = NULL;
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__u32 new_count[2];
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int i, ret;
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if (copy_from_user(new_count, arg, sizeof(new_count)))
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return -EFAULT;
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for (i = 0; i < ARRAY_SIZE(new_count); i++)
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if (new_count[i] > INT_MAX)
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return -EINVAL;
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if (ctx->flags & IORING_SETUP_SQPOLL) {
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sqd = ctx->sq_data;
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if (sqd) {
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/*
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* Observe the correct sqd->lock -> ctx->uring_lock
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* ordering. Fine to drop uring_lock here, we hold
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* a ref to the ctx.
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*/
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refcount_inc(&sqd->refs);
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mutex_unlock(&ctx->uring_lock);
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mutex_lock(&sqd->lock);
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mutex_lock(&ctx->uring_lock);
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if (sqd->thread)
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tctx = sqd->thread->io_uring;
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}
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} else {
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tctx = current->io_uring;
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}
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BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits));
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for (i = 0; i < ARRAY_SIZE(new_count); i++)
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if (new_count[i])
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ctx->iowq_limits[i] = new_count[i];
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ctx->iowq_limits_set = true;
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if (tctx && tctx->io_wq) {
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ret = io_wq_max_workers(tctx->io_wq, new_count);
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if (ret)
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goto err;
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} else {
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memset(new_count, 0, sizeof(new_count));
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}
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if (sqd) {
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mutex_unlock(&ctx->uring_lock);
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mutex_unlock(&sqd->lock);
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io_put_sq_data(sqd);
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mutex_lock(&ctx->uring_lock);
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}
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if (copy_to_user(arg, new_count, sizeof(new_count)))
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return -EFAULT;
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/* that's it for SQPOLL, only the SQPOLL task creates requests */
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if (sqd)
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return 0;
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/* now propagate the restriction to all registered users */
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list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
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tctx = node->task->io_uring;
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if (WARN_ON_ONCE(!tctx->io_wq))
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continue;
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for (i = 0; i < ARRAY_SIZE(new_count); i++)
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new_count[i] = ctx->iowq_limits[i];
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/* ignore errors, it always returns zero anyway */
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(void)io_wq_max_workers(tctx->io_wq, new_count);
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}
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return 0;
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err:
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if (sqd) {
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mutex_unlock(&ctx->uring_lock);
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mutex_unlock(&sqd->lock);
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io_put_sq_data(sqd);
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mutex_lock(&ctx->uring_lock);
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}
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return ret;
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}
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static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
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void __user *arg, unsigned nr_args)
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__releases(ctx->uring_lock)
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__acquires(ctx->uring_lock)
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{
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int ret;
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/*
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* We don't quiesce the refs for register anymore and so it can't be
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* dying as we're holding a file ref here.
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*/
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if (WARN_ON_ONCE(percpu_ref_is_dying(&ctx->refs)))
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return -ENXIO;
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if (ctx->submitter_task && ctx->submitter_task != current)
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return -EEXIST;
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if (ctx->restricted) {
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opcode = array_index_nospec(opcode, IORING_REGISTER_LAST);
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if (!test_bit(opcode, ctx->restrictions.register_op))
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return -EACCES;
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}
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switch (opcode) {
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case IORING_REGISTER_BUFFERS:
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ret = -EFAULT;
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if (!arg)
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break;
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ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL);
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break;
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case IORING_UNREGISTER_BUFFERS:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_sqe_buffers_unregister(ctx);
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break;
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case IORING_REGISTER_FILES:
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ret = -EFAULT;
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if (!arg)
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break;
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ret = io_sqe_files_register(ctx, arg, nr_args, NULL);
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break;
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case IORING_UNREGISTER_FILES:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_sqe_files_unregister(ctx);
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break;
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case IORING_REGISTER_FILES_UPDATE:
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ret = io_register_files_update(ctx, arg, nr_args);
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break;
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case IORING_REGISTER_EVENTFD:
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ret = -EINVAL;
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if (nr_args != 1)
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break;
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ret = io_eventfd_register(ctx, arg, 0);
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break;
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case IORING_REGISTER_EVENTFD_ASYNC:
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ret = -EINVAL;
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if (nr_args != 1)
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break;
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ret = io_eventfd_register(ctx, arg, 1);
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break;
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case IORING_UNREGISTER_EVENTFD:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_eventfd_unregister(ctx);
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break;
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case IORING_REGISTER_PROBE:
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ret = -EINVAL;
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if (!arg || nr_args > 256)
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break;
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ret = io_probe(ctx, arg, nr_args);
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break;
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case IORING_REGISTER_PERSONALITY:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_register_personality(ctx);
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break;
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case IORING_UNREGISTER_PERSONALITY:
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ret = -EINVAL;
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if (arg)
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break;
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ret = io_unregister_personality(ctx, nr_args);
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break;
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case IORING_REGISTER_ENABLE_RINGS:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_register_enable_rings(ctx);
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break;
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case IORING_REGISTER_RESTRICTIONS:
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ret = io_register_restrictions(ctx, arg, nr_args);
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break;
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case IORING_REGISTER_FILES2:
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ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE);
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break;
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case IORING_REGISTER_FILES_UPDATE2:
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ret = io_register_rsrc_update(ctx, arg, nr_args,
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IORING_RSRC_FILE);
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break;
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case IORING_REGISTER_BUFFERS2:
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ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER);
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break;
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case IORING_REGISTER_BUFFERS_UPDATE:
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ret = io_register_rsrc_update(ctx, arg, nr_args,
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IORING_RSRC_BUFFER);
|
|
break;
|
|
case IORING_REGISTER_IOWQ_AFF:
|
|
ret = -EINVAL;
|
|
if (!arg || !nr_args)
|
|
break;
|
|
ret = io_register_iowq_aff(ctx, arg, nr_args);
|
|
break;
|
|
case IORING_UNREGISTER_IOWQ_AFF:
|
|
ret = -EINVAL;
|
|
if (arg || nr_args)
|
|
break;
|
|
ret = io_unregister_iowq_aff(ctx);
|
|
break;
|
|
case IORING_REGISTER_IOWQ_MAX_WORKERS:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args != 2)
|
|
break;
|
|
ret = io_register_iowq_max_workers(ctx, arg);
|
|
break;
|
|
case IORING_REGISTER_RING_FDS:
|
|
ret = io_ringfd_register(ctx, arg, nr_args);
|
|
break;
|
|
case IORING_UNREGISTER_RING_FDS:
|
|
ret = io_ringfd_unregister(ctx, arg, nr_args);
|
|
break;
|
|
case IORING_REGISTER_PBUF_RING:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args != 1)
|
|
break;
|
|
ret = io_register_pbuf_ring(ctx, arg);
|
|
break;
|
|
case IORING_UNREGISTER_PBUF_RING:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args != 1)
|
|
break;
|
|
ret = io_unregister_pbuf_ring(ctx, arg);
|
|
break;
|
|
case IORING_REGISTER_SYNC_CANCEL:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args != 1)
|
|
break;
|
|
ret = io_sync_cancel(ctx, arg);
|
|
break;
|
|
case IORING_REGISTER_FILE_ALLOC_RANGE:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args)
|
|
break;
|
|
ret = io_register_file_alloc_range(ctx, arg);
|
|
break;
|
|
case IORING_REGISTER_PBUF_STATUS:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args != 1)
|
|
break;
|
|
ret = io_register_pbuf_status(ctx, arg);
|
|
break;
|
|
case IORING_REGISTER_NAPI:
|
|
ret = -EINVAL;
|
|
if (!arg || nr_args != 1)
|
|
break;
|
|
ret = io_register_napi(ctx, arg);
|
|
break;
|
|
case IORING_UNREGISTER_NAPI:
|
|
ret = -EINVAL;
|
|
if (nr_args != 1)
|
|
break;
|
|
ret = io_unregister_napi(ctx, arg);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
|
|
void __user *, arg, unsigned int, nr_args)
|
|
{
|
|
struct io_ring_ctx *ctx;
|
|
long ret = -EBADF;
|
|
struct file *file;
|
|
bool use_registered_ring;
|
|
|
|
use_registered_ring = !!(opcode & IORING_REGISTER_USE_REGISTERED_RING);
|
|
opcode &= ~IORING_REGISTER_USE_REGISTERED_RING;
|
|
|
|
if (opcode >= IORING_REGISTER_LAST)
|
|
return -EINVAL;
|
|
|
|
if (use_registered_ring) {
|
|
/*
|
|
* Ring fd has been registered via IORING_REGISTER_RING_FDS, we
|
|
* need only dereference our task private array to find it.
|
|
*/
|
|
struct io_uring_task *tctx = current->io_uring;
|
|
|
|
if (unlikely(!tctx || fd >= IO_RINGFD_REG_MAX))
|
|
return -EINVAL;
|
|
fd = array_index_nospec(fd, IO_RINGFD_REG_MAX);
|
|
file = tctx->registered_rings[fd];
|
|
if (unlikely(!file))
|
|
return -EBADF;
|
|
} else {
|
|
file = fget(fd);
|
|
if (unlikely(!file))
|
|
return -EBADF;
|
|
ret = -EOPNOTSUPP;
|
|
if (!io_is_uring_fops(file))
|
|
goto out_fput;
|
|
}
|
|
|
|
ctx = file->private_data;
|
|
|
|
mutex_lock(&ctx->uring_lock);
|
|
ret = __io_uring_register(ctx, opcode, arg, nr_args);
|
|
mutex_unlock(&ctx->uring_lock);
|
|
trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, ret);
|
|
out_fput:
|
|
if (!use_registered_ring)
|
|
fput(file);
|
|
return ret;
|
|
}
|