From: Charles Mirabile <cmirabil@redhat.com>
Date: Mon, 20 Nov 2023 10:55:45 +0000 (-0500)
Subject: io_uring/fs: consider link->flags when getting path for LINKAT
X-Git-Tag: v5.15.141~21
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=35b5d86e43ec8efe2e40881a1f0b49da72efe9e4;p=thirdparty%2Fkernel%2Fstable.git

io_uring/fs: consider link->flags when getting path for LINKAT

commit 8479063f1fbee201a8739130e816cc331b675838 upstream.

In order for `AT_EMPTY_PATH` to work as expected, the fact
that the user wants that behavior needs to make it to `getname_flags`
or it will return ENOENT.

Fixes: cf30da90bc3a ("io_uring: add support for IORING_OP_LINKAT")
Cc:  <stable@vger.kernel.org>
Link: https://github.com/axboe/liburing/issues/995
Signed-off-by: Charles Mirabile <cmirabil@redhat.com>
Link: https://lore.kernel.org/r/20231120105545.1209530-1-cmirabil@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index e26292d8b8457..4852e8579df5d 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4049,7 +4049,7 @@ static int io_linkat_prep(struct io_kiocb *req,
 	newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
 	lnk->flags = READ_ONCE(sqe->hardlink_flags);
 
-	lnk->oldpath = getname(oldf);
+	lnk->oldpath = getname_uflags(oldf, lnk->flags);
 	if (IS_ERR(lnk->oldpath))
 		return PTR_ERR(lnk->oldpath);