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9p-for-6.2-rc1

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- improve p9_check_errors to check buffer size instead of msize when possible
 (e.g. not zero-copy)
 - some more syzbot and KCSAN fixes
 - minor headers include cleanup
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Merge tag '9p-for-6.2-rc1' of https://github.com/martinetd/linux

Pull 9p updates from Dominique Martinet:

 - improve p9_check_errors to check buffer size instead of msize when
   possible (e.g. not zero-copy)

 - some more syzbot and KCSAN fixes

 - minor headers include cleanup

* tag '9p-for-6.2-rc1' of https://github.com/martinetd/linux:
  9p/client: fix data race on req->status
  net/9p: fix response size check in p9_check_errors()
  net/9p: distinguish zero-copy requests
  9p/xen: do not memcpy header into req->rc
  9p: set req refcount to zero to avoid uninitialized usage
  9p/net: Remove unneeded idr.h #include
  9p/fs: Remove unneeded idr.h #include
This commit is contained in:
Linus Torvalds 2022-12-23 11:39:18 -08:00
commit e3b862ed89
15 changed files with 42 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/9p/fid.c
View File

@ -11,7 +11,6 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/idr.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

1
fs/9p/v9fs.c
View File

@ -14,7 +14,6 @@
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/parser.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <net/9p/9p.h>

1
fs/9p/vfs_addr.c
View File

@ -14,7 +14,6 @@
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/pagemap.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/swap.h>
#include <linux/uio.h>

1
fs/9p/vfs_dentry.c
View File

@ -15,7 +15,6 @@
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <net/9p/9p.h>

1
fs/9p/vfs_dir.c
View File

@ -14,7 +14,6 @@
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/fscache.h>

1
fs/9p/vfs_file.c
View File

@ -18,7 +18,6 @@
#include <linux/pagemap.h>
#include <linux/utsname.h>
#include <linux/uaccess.h>
#include <linux/idr.h>
#include <linux/uio.h>
#include <linux/slab.h>
#include <net/9p/9p.h>

1
fs/9p/vfs_inode.c
View File

@ -17,7 +17,6 @@
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/xattr.h>

1
fs/9p/vfs_inode_dotl.c
View File

@ -15,7 +15,6 @@
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/xattr.h>

1
fs/9p/vfs_super.c
View File

@ -15,7 +15,6 @@
#include <linux/inet.h>
#include <linux/pagemap.h>
#include <linux/mount.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/statfs.h>

2
include/net/9p/9p.h
View File

@ -531,6 +531,7 @@ struct p9_rstatfs {
* @offset: used by marshalling routines to track current position in buffer
* @capacity: used by marshalling routines to track total malloc'd capacity
* @sdata: payload
* @zc: whether zero-copy is used
*
* &p9_fcall represents the structure for all 9P RPC
* transactions. Requests are packaged into fcalls, and reponses
@ -549,6 +550,7 @@ struct p9_fcall {
struct kmem_cache *cache;
u8 *sdata;
bool zc;
};
int p9_errstr2errno(char *errstr, int len);

33
net/9p/client.c
View File

@ -297,6 +297,11 @@ p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size,
p9pdu_reset(&req->rc);
req->t_err = 0;
req->status = REQ_STATUS_ALLOC;
/* refcount needs to be set to 0 before inserting into the idr
* so p9_tag_lookup does not accept a request that is not fully
* initialized. refcount_set to 2 below will mark request ready.
*/
refcount_set(&req->refcount, 0);
init_waitqueue_head(&req->wq);
INIT_LIST_HEAD(&req->req_list);
@ -438,7 +443,7 @@ void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
* the status change is visible to another thread
*/
smp_wmb();
req->status = status;
WRITE_ONCE(req->status, status);
wake_up(&req->wq);
p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
@ -514,10 +519,9 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
int ecode;
err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
if (req->rc.size >= c->msize) {
p9_debug(P9_DEBUG_ERROR,
"requested packet size too big: %d\n",
req->rc.size);
if (req->rc.size > req->rc.capacity && !req->rc.zc) {
pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n",
req->rc.size, req->rc.capacity, req->rc.id);
return -EIO;
}
/* dump the response from server
@ -600,7 +604,7 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
/* if we haven't received a response for oldreq,
* remove it from the list
*/
if (oldreq->status == REQ_STATUS_SENT) {
if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) {
if (c->trans_mod->cancelled)
c->trans_mod->cancelled(c, oldreq);
}
@ -680,6 +684,9 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
if (IS_ERR(req))
return req;
req->tc.zc = false;
req->rc.zc = false;
if (signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
@ -697,7 +704,8 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
}
again:
/* Wait for the response */
err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
err = wait_event_killable(req->wq,
READ_ONCE(req->status) >= REQ_STATUS_RCVD);
/* Make sure our req is coherent with regard to updates in other
* threads - echoes to wmb() in the callback
@ -711,7 +719,7 @@ again:
goto again;
}
if (req->status == REQ_STATUS_ERROR) {
if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
@ -724,7 +732,7 @@ again:
p9_client_flush(c, req);
/* if we received the response anyway, don't signal error */
if (req->status == REQ_STATUS_RCVD)
if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
err = 0;
}
recalc_sigpending:
@ -778,6 +786,9 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
if (IS_ERR(req))
return req;
req->tc.zc = true;
req->rc.zc = true;
if (signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
@ -793,7 +804,7 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
if (err != -ERESTARTSYS)
goto recalc_sigpending;
}
if (req->status == REQ_STATUS_ERROR) {
if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
err = req->t_err;
}
@ -806,7 +817,7 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
p9_client_flush(c, req);
/* if we received the response anyway, don't signal error */
if (req->status == REQ_STATUS_RCVD)
if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
err = 0;
}
recalc_sigpending:

13
net/9p/trans_fd.c
View File

@ -20,7 +20,6 @@
#include <linux/un.h>
#include <linux/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/slab.h>
@ -202,11 +201,11 @@ static void p9_conn_cancel(struct p9_conn *m, int err)
list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
list_move(&req->req_list, &cancel_list);
req->status = REQ_STATUS_ERROR;
WRITE_ONCE(req->status, REQ_STATUS_ERROR);
}
list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
list_move(&req->req_list, &cancel_list);
req->status = REQ_STATUS_ERROR;
WRITE_ONCE(req->status, REQ_STATUS_ERROR);
}
spin_unlock(&m->req_lock);
@ -467,7 +466,7 @@ static void p9_write_work(struct work_struct *work)
req = list_entry(m->unsent_req_list.next, struct p9_req_t,
req_list);
req->status = REQ_STATUS_SENT;
WRITE_ONCE(req->status, REQ_STATUS_SENT);
p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
list_move_tail(&req->req_list, &m->req_list);
@ -676,7 +675,7 @@ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
return m->err;
spin_lock(&m->req_lock);
req->status = REQ_STATUS_UNSENT;
WRITE_ONCE(req->status, REQ_STATUS_UNSENT);
list_add_tail(&req->req_list, &m->unsent_req_list);
spin_unlock(&m->req_lock);
@ -703,7 +702,7 @@ static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
if (req->status == REQ_STATUS_UNSENT) {
list_del(&req->req_list);
req->status = REQ_STATUS_FLSHD;
WRITE_ONCE(req->status, REQ_STATUS_FLSHD);
p9_req_put(client, req);
ret = 0;
}
@ -732,7 +731,7 @@ static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
* remove it from the list.
*/
list_del(&req->req_list);
req->status = REQ_STATUS_FLSHD;
WRITE_ONCE(req->status, REQ_STATUS_FLSHD);
spin_unlock(&m->req_lock);
p9_req_put(client, req);

5
net/9p/trans_rdma.c
View File

@ -21,7 +21,6 @@
#include <linux/un.h>
#include <linux/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/semaphore.h>
@ -507,7 +506,7 @@ dont_need_post_recv:
* because doing if after could erase the REQ_STATUS_RCVD
* status in case of a very fast reply.
*/
req->status = REQ_STATUS_SENT;
WRITE_ONCE(req->status, REQ_STATUS_SENT);
err = ib_post_send(rdma->qp, &wr, NULL);
if (err)
goto send_error;
@ -517,7 +516,7 @@ dont_need_post_recv:
/* Handle errors that happened during or while preparing the send: */
send_error:
req->status = REQ_STATUS_ERROR;
WRITE_ONCE(req->status, REQ_STATUS_ERROR);
kfree(c);
p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err);

10
net/9p/trans_virtio.c
View File

@ -22,7 +22,6 @@
#include <linux/un.h>
#include <linux/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
#include <linux/highmem.h>
#include <linux/slab.h>
@ -263,7 +262,7 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
p9_debug(P9_DEBUG_TRANS, "9p debug: virtio request\n");
req->status = REQ_STATUS_SENT;
WRITE_ONCE(req->status, REQ_STATUS_SENT);
req_retry:
spin_lock_irqsave(&chan->lock, flags);
@ -469,7 +468,7 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
inlen = n;
}
}
req->status = REQ_STATUS_SENT;
WRITE_ONCE(req->status, REQ_STATUS_SENT);
req_retry_pinned:
spin_lock_irqsave(&chan->lock, flags);
@ -532,9 +531,10 @@ req_retry_pinned:
spin_unlock_irqrestore(&chan->lock, flags);
kicked = 1;
p9_debug(P9_DEBUG_TRANS, "virtio request kicked\n");
err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
err = wait_event_killable(req->wq,
READ_ONCE(req->status) >= REQ_STATUS_RCVD);
// RERROR needs reply (== error string) in static data
if (req->status == REQ_STATUS_RCVD &&
if (READ_ONCE(req->status) == REQ_STATUS_RCVD &&
unlikely(req->rc.sdata[4] == P9_RERROR))
handle_rerror(req, in_hdr_len, offs, in_pages);

8
net/9p/trans_xen.c
View File

@ -157,7 +157,7 @@ again:
&masked_prod, masked_cons,
XEN_9PFS_RING_SIZE(ring));
p9_req->status = REQ_STATUS_SENT;
WRITE_ONCE(p9_req->status, REQ_STATUS_SENT);
virt_wmb(); /* write ring before updating pointer */
prod += size;
ring->intf->out_prod = prod;
@ -212,11 +212,13 @@ static void p9_xen_response(struct work_struct *work)
dev_warn(&priv->dev->dev,
"requested packet size too big: %d for tag %d with capacity %zd\n",
h.size, h.tag, req->rc.capacity);
req->status = REQ_STATUS_ERROR;
WRITE_ONCE(req->status, REQ_STATUS_ERROR);
goto recv_error;
}
memcpy(&req->rc, &h, sizeof(h));
req->rc.size = h.size;
req->rc.id = h.id;
req->rc.tag = h.tag;
req->rc.offset = 0;
masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));