io_uring: handle -EFAULT properly in io_uring_setup()

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If copy_to_user() in io_uring_setup() failed, we'll leak many kernel
resources, which will be recycled until process terminates. This bug
can be reproduced by using mprotect to set params to PROT_READ. To fix
this issue, refactor io_uring_create() a bit to add a new 'struct
io_uring_params __user *params' parameter and move the copy_to_user()
in io_uring_setup() to io_uring_setup(), if copy_to_user() failed,
we can free kernel resource properly.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Xiaoguang Wang 2020-05-05 16:28:53 +08:00 • committed by Jens Axboe

parent d8f1b9716c

commit 7f13657d14

1 changed files with 11 additions and 13 deletions

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fs/io_uring.c

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