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io_uring: ensure openat sets O_LARGEFILE if needed 

OPENAT2 correctly sets O_LARGEFILE if it has to, but that escaped the
OPENAT opcode. Dmitry reports that his test case that compares openat()
and IORING_OP_OPENAT sees failures on large files:

*** sync openat
openat succeeded
sync write at offset 0
write succeeded
sync write at offset 4294967296
write succeeded

*** sync openat
openat succeeded
io_uring write at offset 0
write succeeded
io_uring write at offset 4294967296
write succeeded

*** io_uring openat
openat succeeded
sync write at offset 0
write succeeded
sync write at offset 4294967296
write failed: File too large

*** io_uring openat
openat succeeded
io_uring write at offset 0
write succeeded
io_uring write at offset 4294967296
write failed: File too large

Ensure we set O_LARGEFILE, if force_o_largefile() is true.

Cc: stable@vger.kernel.org # v5.6
Fixes: 15b71abe7b ("io_uring: add support for IORING_OP_OPENAT")
Reported-by: Dmitry Kadashev <dkadashev@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-04-08 09:20:54 -06:00
parent f7fe934686
commit 08a1d26eb8
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -2957,6 +2957,8 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
req->open.how.mode = READ_ONCE(sqe->len);
fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
req->open.how.flags = READ_ONCE(sqe->open_flags);
if (force_o_largefile())
req->open.how.flags |= O_LARGEFILE;
req->open.filename = getname(fname);
if (IS_ERR(req->open.filename)) {