lisa/android_kernel_xiaomi_sm8350
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io_uring: disable polling pollfree files

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Older kernels lack io_uring POLLFREE handling. As only affected files
are signalfd and android binder the safest option would be to disable
polling those files via io_uring and hope there are no users.

Fixes: 221c5eb233 ("io_uring: add support for IORING_OP_POLL")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2022-09-01 16:19:15 +01:00 committed by Greg Kroah-Hartman
parent b474ff1b20
commit fc78b2fc21
4 changed files with 6 additions and 0 deletions
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1
drivers/android/binder.c
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@ -6083,6 +6083,7 @@ const struct file_operations binder_fops = {
.open = binder_open,
.flush = binder_flush,
.release = binder_release,
.may_pollfree = true,
};
static int __init init_binder_device(const char *name)

3
fs/io_uring.c
View File

@ -1908,6 +1908,9 @@ static int io_poll_add(struct io_kiocb *req, const struct io_uring_sqe *sqe)
__poll_t mask;
u16 events;
if (req->file->f_op->may_pollfree)
return -EOPNOTSUPP;
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index)

1
fs/signalfd.c
View File

@ -248,6 +248,7 @@ static const struct file_operations signalfd_fops = {
.poll = signalfd_poll,
.read = signalfd_read,
.llseek = noop_llseek,
.may_pollfree = true,
};
static int do_signalfd4(int ufd, sigset_t *mask, int flags)

1
include/linux/fs.h
View File

@ -1859,6 +1859,7 @@ struct file_operations {
struct file *file_out, loff_t pos_out,
loff_t len, unsigned int remap_flags);
int (*fadvise)(struct file *, loff_t, loff_t, int);
bool may_pollfree;
} __randomize_layout;
struct inode_operations {