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2023-01-20io_uring/msg_ring: fix remote queue to disabled ringPavel Begunkov1-0/+8
IORING_SETUP_R_DISABLED rings don't have the submitter task set, so it's not always safe to use ->submitter_task. Disallow posting msg_ring messaged to disabled rings. Also add task NULL check for loosy sync around testing for IORING_SETUP_R_DISABLED. Cc: stable@vger.kernel.org Fixes: 6d043ee1164ca ("io_uring: do msg_ring in target task via tw") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-01-20io_uring/msg_ring: fix flagging remote executionPavel Begunkov1-17/+23
There is a couple of problems with queueing a tw in io_msg_ring_data() for remote execution. First, once we queue it the target ring can go away and so setting IORING_SQ_TASKRUN there is not safe. Secondly, the userspace might not expect IORING_SQ_TASKRUN. Extract a helper and uniformly use TWA_SIGNAL without TWA_SIGNAL_NO_IPI tricks for now, just as it was done in the original patch. Cc: stable@vger.kernel.org Fixes: 6d043ee1164ca ("io_uring: do msg_ring in target task via tw") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-01-19io_uring/msg_ring: fix missing lock on overflow for IOPOLLJens Axboe1-9/+30
If the target ring is configured with IOPOLL, then we always need to hold the target ring uring_lock before posting CQEs. We could just grab it unconditionally, but since we don't expect many target rings to be of this type, make grabbing the uring_lock conditional on the ring type. Link: https://lore.kernel.org/io-uring/Y8krlYa52%2F0YGqkg@ip-172-31-85-199.ec2.internal/ Reported-by: Xingyuan Mo <hdthky0@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-01-19io_uring/msg_ring: move double lock/unlock helpers higher upJens Axboe1-24/+23
In preparation for needing them somewhere else, move them and get rid of the unused 'issue_flags' for the unlock side. No functional changes in this patch. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-12-08io_uring/msg_ring: flag target ring as having task_work, if neededJens Axboe1-0/+1
Before the recent change, we didn't even wake the targeted task when posting the cqe remotely. Now we do wake it, but we do want to ensure that the recipient knows there's potential work there that needs to get processed to get the CQE posted. OR in IORING_SQ_TASKRUN for that purpose. Link: https://lore.kernel.org/io-uring/2843c6b4-ba9a-b67d-e0f4-957f42098489@kernel.dk/ Fixes: 6d043ee1164c ("io_uring: do msg_ring in target task via tw") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-12-07io_uring: do msg_ring in target task via twPavel Begunkov1-3/+53
While executing in a context of one io_uring instance msg_ring manipulates another ring. We're trying to keep CQEs posting contained in the context of the ring-owner task, use task_work to send the request to the target ring's task when we're modifying its CQ or trying to install a file. Note, we can't safely use io_uring task_work infra and have to use task_work directly. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/4d76c7b28ed5d71b520de4482fbb7f660f21cd80.1670384893.git.asml.silence@gmail.com [axboe: use TWA_SIGNAL_NO_IPI] Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-12-07io_uring: extract a io_msg_install_complete helperPavel Begunkov1-13/+21
Extract a helper called io_msg_install_complete() from io_msg_send_fd(), will be used later. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/1500ca1054cc4286a3ee1c60aacead57fcdfa02a.1670384893.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-12-07io_uring: get rid of double lockingPavel Begunkov1-36/+49
We don't need to take both uring_locks at once, msg_ring can be split in two parts, first getting a file from the filetable of the first ring and then installing it into the second one. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/a80ecc2bc99c3b3f2cf20015d618b7c51419a797.1670384893.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-12-07io_uring: improve io_double_lock_ctx fail handlingPavel Begunkov1-0/+2
msg_ring will fail the request if it can't lock rings, instead punt it to io-wq as was originally intended. Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/4697f05afcc37df5c8f89e2fe6d9c7c19f0241f9.1670384893.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-12-07io_uring: dont remove file from msg_ring reqsPavel Begunkov1-4/+0
We should not be messing with req->file outside of core paths. Clearing it makes msg_ring non reentrant, i.e. luckily io_msg_send_fd() fails the request on failed io_double_lock_ctx() but clearly was originally intended to do retries instead. Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/e5ac9edadb574fe33f6d727cb8f14ce68262a684.1670384893.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-11-25io_uring: remove overflow param from io_post_aux_cqeDylan Yudaken1-2/+2
The only call sites which would not allow overflow are also call sites which would use the io_aux_cqe as they care about ordering. So remove this parameter from io_post_aux_cqe. Signed-off-by: Dylan Yudaken <dylany@meta.com> Link: https://lore.kernel.org/r/20221124093559.3780686-9-dylany@meta.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-10-19io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()Harshit Mogalapalli1-0/+3
Syzkaller produced the below call trace: BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0 Write of size 8 at addr 0000000000000070 by task repro/16399 CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 ? io_msg_ring+0x3cb/0x9f0 kasan_report+0xbc/0xf0 ? io_msg_ring+0x3cb/0x9f0 kasan_check_range+0x140/0x190 io_msg_ring+0x3cb/0x9f0 ? io_msg_ring_prep+0x300/0x300 io_issue_sqe+0x698/0xca0 io_submit_sqes+0x92f/0x1c30 __do_sys_io_uring_enter+0xae4/0x24b0 .... RIP: 0033:0x7f2eaf8f8289 RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289 RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004 RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0 R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000 </TASK> Kernel panic - not syncing: panic_on_warn set ... We don't have a NULL check on file_ptr in io_msg_send_fd() function, so when file_ptr is NUL src_file is also NULL and get_file() dereferences a NULL pointer and leads to above crash. Add a NULL check to fix this issue. Fixes: e6130eba8a84 ("io_uring: add support for passing fixed file descriptors") Reported-by: syzkaller <syzkaller@googlegroups.com> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> Link: https://lore.kernel.org/r/20221019171218.1337614-1-harshit.m.mogalapalli@oracle.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-09-15io_uring/msg_ring: check file type before puttingJens Axboe1-1/+2
If we're invoked with a fixed file, follow the normal rules of not calling io_fput_file(). Fixed files are permanently registered to the ring, and do not need putting separately. Cc: stable@vger.kernel.org Fixes: aa184e8671f0 ("io_uring: don't attempt to IOPOLL for MSG_RING requests") Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-08-12io_uring: make io_kiocb_to_cmd() typesafeStefan Metzmacher1-4/+4
We need to make sure (at build time) that struct io_cmd_data is not casted to a structure that's larger. Signed-off-by: Stefan Metzmacher <metze@samba.org> Link: https://lore.kernel.org/r/c024cdf25ae19fc0319d4180e2298bade8ed17b8.1660201408.git.metze@samba.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24io_uring: add allow_overflow to io_post_aux_cqeDylan Yudaken1-2/+2
Some use cases of io_post_aux_cqe would not want to overflow as is, but might want to change the flags/result. For example multishot receive requires in order CQE, and so if there is an overflow it would need to stop receiving until the overflow is taken care of. Signed-off-by: Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220630091231.1456789-8-dylany@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24io_uring: add support for passing fixed file descriptorsJens Axboe1-7/+123
With IORING_OP_MSG_RING, one ring can send a message to another ring. Extend that support to also allow sending a fixed file descriptor to that ring, enabling one ring to pass a registered descriptor to another one. Arguments are extended to pass in: sqe->addr3 fixed file slot in source ring sqe->file_index fixed file slot in destination ring IORING_OP_MSG_RING is extended to take a command argument in sqe->addr. If set to zero (or IORING_MSG_DATA), it sends just a message like before. If set to IORING_MSG_SEND_FD, a fixed file descriptor is sent according to the above arguments. Two common use cases for this are: 1) Server needs to be shutdown or restarted, pass file descriptors to another onei 2) Backend is split, and one accepts connections, while others then get the fd passed and handle the actual connection. Both of those are classic SCM_RIGHTS use cases, and it's not possible to support them with direct descriptors today. By default, this will post a CQE to the target ring, similarly to how IORING_MSG_DATA does it. If IORING_MSG_RING_CQE_SKIP is set, no message is posted to the target ring. The issuer is expected to notify the receiver side separately. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24io_uring: kill extra io_uring_types.h includesPavel Begunkov1-1/+0
io_uring/io_uring.h already includes io_uring_types.h, no need to include it every time. Kill it in a bunch of places, it prepares us for following patches. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/94d8c943fbe0ef949981c508ddcee7fc1c18850f.1655384063.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24io_uring: don't expose io_fill_cqe_aux()Pavel Begunkov1-10/+1
Deduplicate some code and add a helper for filling an aux CQE, locking and notification. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/b7c6557c8f9dc5c4cfb01292116c682a0ff61081.1655455613.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24io_uring: move msg_ring into its own fileJens Axboe1-0/+65
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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