| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20240823200819.532106-8-dhowells@redhat.com>
Date: Fri, 23 Aug 2024 21:08:15 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>,
Steve French <sfrench@...ba.org>
Cc: David Howells <dhowells@...hat.com>,
Pankaj Raghav <p.raghav@...sung.com>,
Paulo Alcantara <pc@...guebit.com>,
Jeff Layton <jlayton@...nel.org>,
Matthew Wilcox <willy@...radead.org>,
netfs@...ts.linux.dev,
linux-afs@...ts.infradead.org,
linux-cifs@...r.kernel.org,
linux-nfs@...r.kernel.org,
ceph-devel@...r.kernel.org,
v9fs@...ts.linux.dev,
linux-erofs@...ts.ozlabs.org,
linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Christian Brauner <brauner@...nel.org>
Subject: [PATCH 7/9] netfs, cifs: Fix handling of short DIO read
Short DIO reads, particularly in relation to cifs, are not being handled
correctly by cifs and netfslib. This can be tested by doing a DIO read of
a file where the size of read is larger than the size of the file. When it
crosses the EOF, it gets a short read and this gets retried, and in the
case of cifs, the retry read fails, with the failure being translated to
ENODATA.
Fix this by the following means:
(1) Add a flag, NETFS_SREQ_HIT_EOF, for the filesystem to set when it
detects that the read did hit the EOF.
(2) Make the netfslib read assessment stop processing subrequests when it
encounters one with that flag set.
(3) Return rreq->transferred, the accumulated contiguous amount read to
that point, to userspace for a DIO read.
(4) Make cifs set the flag and clear the error if the read RPC returned
ENODATA.
(5) Make cifs set the flag and clear the error if a short read occurred
without error and the read-to file position is now at the remote inode
size.
Fixes: 69c3c023af25 ("cifs: Implement netfslib hooks")
Signed-off-by: David Howells <dhowells@...hat.com>
Link: https://lore.kernel.org/r/20240822220650.318774-3-dhowells@redhat.com
cc: Steve French <sfrench@...ba.org>
cc: Paulo Alcantara <pc@...guebit.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: linux-cifs@...r.kernel.org
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
Signed-off-by: Christian Brauner <brauner@...nel.org>
---
fs/netfs/io.c | 17 +++++++++++------
fs/smb/client/smb2pdu.c | 13 +++++++++----
include/linux/netfs.h | 1 +
3 files changed, 21 insertions(+), 10 deletions(-)
diff --git a/fs/netfs/io.c b/fs/netfs/io.c
index 3303b515b536..943128507af5 100644
--- a/fs/netfs/io.c
+++ b/fs/netfs/io.c
@@ -368,7 +368,8 @@ static void netfs_rreq_assess_dio(struct netfs_io_request *rreq)
if (subreq->error || subreq->transferred == 0)
break;
transferred += subreq->transferred;
- if (subreq->transferred < subreq->len)
+ if (subreq->transferred < subreq->len ||
+ test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags))
break;
}
@@ -503,7 +504,8 @@ void netfs_subreq_terminated(struct netfs_io_subrequest *subreq,
subreq->error = 0;
subreq->transferred += transferred_or_error;
- if (subreq->transferred < subreq->len)
+ if (subreq->transferred < subreq->len &&
+ !test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags))
goto incomplete;
complete:
@@ -782,10 +784,13 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync)
TASK_UNINTERRUPTIBLE);
ret = rreq->error;
- if (ret == 0 && rreq->submitted < rreq->len &&
- rreq->origin != NETFS_DIO_READ) {
- trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read);
- ret = -EIO;
+ if (ret == 0) {
+ if (rreq->origin == NETFS_DIO_READ) {
+ ret = rreq->transferred;
+ } else if (rreq->submitted < rreq->len) {
+ trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read);
+ ret = -EIO;
+ }
}
} else {
/* If we decrement nr_outstanding to 0, the ref belongs to us. */
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index d80107d1ba9e..9829784e8ec5 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -4507,6 +4507,7 @@ static void
smb2_readv_callback(struct mid_q_entry *mid)
{
struct cifs_io_subrequest *rdata = mid->callback_data;
+ struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
struct TCP_Server_Info *server = rdata->server;
struct smb2_hdr *shdr =
@@ -4600,11 +4601,15 @@ smb2_readv_callback(struct mid_q_entry *mid)
rdata->got_bytes);
if (rdata->result == -ENODATA) {
- /* We may have got an EOF error because fallocate
- * failed to enlarge the file.
- */
- if (rdata->subreq.start < rdata->subreq.rreq->i_size)
+ __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
+ rdata->result = 0;
+ } else {
+ if (rdata->got_bytes < rdata->actual_len &&
+ rdata->subreq.start + rdata->subreq.transferred + rdata->got_bytes ==
+ ictx->remote_i_size) {
+ __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
+ }
}
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
server->credits, server->in_flight,
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 983816608f15..c47443e7a97e 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -198,6 +198,7 @@ struct netfs_io_subrequest {
#define NETFS_SREQ_NEED_RETRY 9 /* Set if the filesystem requests a retry */
#define NETFS_SREQ_RETRYING 10 /* Set if we're retrying */
#define NETFS_SREQ_FAILED 11 /* Set if the subreq failed unretryably */
+#define NETFS_SREQ_HIT_EOF 12 /* Set if we hit the EOF */
};
enum netfs_io_origin {
Powered by blists - more mailing lists