From: Jan Kara jack@suse.cz
[ Upstream commit c725bfce7968009756ed2836a8cd7ba4dc163011 ]
Commit 296291cdd162 (mm: make sendfile(2) killable) fixed an issue where sendfile(2) was doing a lot of tiny writes into a filesystem and thus was unkillable for a long time. However sendfile(2) can be (mis)used to issue lots of writes into arbitrary file descriptor such as evenfd or similar special file descriptors which never hit the standard filesystem write path and thus are still unkillable. E.g. the following example from Dmitry burns CPU for ~16s on my test system without possibility to be killed:
int r1 = eventfd(0, 0); int r2 = memfd_create("", 0); unsigned long n = 1<<30; fallocate(r2, 0, 0, n); sendfile(r1, r2, 0, n);
There are actually quite a few tests for pending signals in sendfile code however we data to write is always available none of them seems to trigger. So fix the problem by adding a test for pending signal into splice_from_pipe_next() also before the loop waiting for pipe buffers to be available. This should fix all the lockup issues with sendfile of the do-ton-of-tiny-writes nature.
CC: stable@vger.kernel.org Reported-by: Dmitry Vyukov dvyukov@google.com Signed-off-by: Jan Kara jack@suse.cz Signed-off-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Sasha Levin sashal@kernel.org --- fs/splice.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/fs/splice.c b/fs/splice.c index cf0cb768a1a7..852194d3ce4a 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -809,6 +809,13 @@ static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_des */ static int splice_from_pipe_next(struct pipe_inode_info *pipe, struct splice_desc *sd) { + /* + * Check for signal early to make process killable when there are + * always buffers available + */ + if (signal_pending(current)) + return -ERESTARTSYS; + while (!pipe->nrbufs) { if (!pipe->writers) return 0;