[Qemu-devel] [PATCH v5 2/5] 9p: Treat multiple devices on one export as an error

[Christian Schoenebeck]

The QID path should uniquely identify a file. However, the
inode of a file is currently used as the QID path, which
on its own only uniquely identifies files within a device.
Here we track the device hosting the 9pfs share, in order
to prevent security issues with QID path collisions from
other devices.

Signed-off-by: Antonios Motakis <address@hidden>
[CS: - Assign dev_id to export root's device already in
       v9fs_device_realize_common(), not postponed in
       stat_to_qid().
     - error_report_once() if more than one device was
       shared by export.
     - Return -ENODEV instead of -ENOSYS in stat_to_qid().
     - Fixed typo in log comment. ]
Signed-off-by: Christian Schoenebeck <address@hidden>
---
 hw/9pfs/9p.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++------------
 hw/9pfs/9p.h |  1 +
 2 files changed, 56 insertions(+), 14 deletions(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 586a6dccba..8cc65c2c67 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -572,10 +572,18 @@ static void coroutine_fn virtfs_reset(V9fsPDU *pdu)
                                 P9_STAT_MODE_SOCKET)
 
 /* This is the algorithm from ufs in spfs */
-static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
+static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp)
 {
     size_t size;
 
+    if (pdu->s->dev_id != stbuf->st_dev) {
+        error_report_once(
+            "9p: Multiple devices detected in same VirtFS export. "
+            "You must use a separate export for each device."
+        );
+        return -ENODEV;
+    }
+
     memset(&qidp->path, 0, sizeof(qidp->path));
     size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
     memcpy(&qidp->path, &stbuf->st_ino, size);
@@ -587,6 +595,8 @@ static void stat_to_qid(const struct stat *stbuf, V9fsQID 
*qidp)
     if (S_ISLNK(stbuf->st_mode)) {
         qidp->type |= P9_QID_TYPE_SYMLINK;
     }
+
+    return 0;
 }
 
 static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
@@ -599,7 +609,10 @@ static int coroutine_fn fid_to_qid(V9fsPDU *pdu, 
V9fsFidState *fidp,
     if (err < 0) {
         return err;
     }
-    stat_to_qid(&stbuf, qidp);
+    err = stat_to_qid(pdu, &stbuf, qidp);
+    if (err < 0) {
+        return err;
+    }
     return 0;
 }
 
@@ -830,7 +843,10 @@ static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, 
V9fsPath *path,
 
     memset(v9stat, 0, sizeof(*v9stat));
 
-    stat_to_qid(stbuf, &v9stat->qid);
+    err = stat_to_qid(pdu, stbuf, &v9stat->qid);
+    if (err < 0) {
+        return err;
+    }
     v9stat->mode = stat_to_v9mode(stbuf);
     v9stat->atime = stbuf->st_atime;
     v9stat->mtime = stbuf->st_mtime;
@@ -891,7 +907,7 @@ static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, 
V9fsPath *path,
 #define P9_STATS_ALL           0x00003fffULL /* Mask for All fields above */
 
 
-static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
+static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf,
                                 V9fsStatDotl *v9lstat)
 {
     memset(v9lstat, 0, sizeof(*v9lstat));
@@ -913,7 +929,7 @@ static void stat_to_v9stat_dotl(V9fsState *s, const struct 
stat *stbuf,
     /* Currently we only support BASIC fields in stat */
     v9lstat->st_result_mask = P9_STATS_BASIC;
 
-    stat_to_qid(stbuf, &v9lstat->qid);
+    return stat_to_qid(pdu, stbuf, &v9lstat->qid);
 }
 
 static void print_sg(struct iovec *sg, int cnt)
@@ -1115,7 +1131,6 @@ static void coroutine_fn v9fs_getattr(void *opaque)
     uint64_t request_mask;
     V9fsStatDotl v9stat_dotl;
     V9fsPDU *pdu = opaque;
-    V9fsState *s = pdu->s;
 
     retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask);
     if (retval < 0) {
@@ -1136,7 +1151,10 @@ static void coroutine_fn v9fs_getattr(void *opaque)
     if (retval < 0) {
         goto out;
     }
-    stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
+    retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl);
+    if (retval < 0) {
+        goto out;
+    }
 
     /*  fill st_gen if requested and supported by underlying fs */
     if (request_mask & P9_STATS_GEN) {
@@ -1381,7 +1399,10 @@ static void coroutine_fn v9fs_walk(void *opaque)
             if (err < 0) {
                 goto out;
             }
-            stat_to_qid(&stbuf, &qid);
+            err = stat_to_qid(pdu, &stbuf, &qid);
+            if (err < 0) {
+                goto out;
+            }
             v9fs_path_copy(&dpath, &path);
         }
         memcpy(&qids[name_idx], &qid, sizeof(qid));
@@ -1483,7 +1504,10 @@ static void coroutine_fn v9fs_open(void *opaque)
     if (err < 0) {
         goto out;
     }
-    stat_to_qid(&stbuf, &qid);
+    err = stat_to_qid(pdu, &stbuf, &qid);
+    if (err < 0) {
+        goto out;
+    }
     if (S_ISDIR(stbuf.st_mode)) {
         err = v9fs_co_opendir(pdu, fidp);
         if (err < 0) {
@@ -1593,7 +1617,10 @@ static void coroutine_fn v9fs_lcreate(void *opaque)
         fidp->flags |= FID_NON_RECLAIMABLE;
     }
     iounit =  get_iounit(pdu, &fidp->path);
-    stat_to_qid(&stbuf, &qid);
+    err = stat_to_qid(pdu, &stbuf, &qid);
+    if (err < 0) {
+        goto out;
+    }
     err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
     if (err < 0) {
         goto out;
@@ -2327,7 +2354,10 @@ static void coroutine_fn v9fs_create(void *opaque)
         }
     }
     iounit = get_iounit(pdu, &fidp->path);
-    stat_to_qid(&stbuf, &qid);
+    err = stat_to_qid(pdu, &stbuf, &qid);
+    if (err < 0) {
+        goto out;
+    }
     err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
     if (err < 0) {
         goto out;
@@ -2384,7 +2414,10 @@ static void coroutine_fn v9fs_symlink(void *opaque)
     if (err < 0) {
         goto out;
     }
-    stat_to_qid(&stbuf, &qid);
+    err = stat_to_qid(pdu, &stbuf, &qid);
+    if (err < 0) {
+        goto out;
+    }
     err =  pdu_marshal(pdu, offset, "Q", &qid);
     if (err < 0) {
         goto out;
@@ -3064,7 +3097,10 @@ static void coroutine_fn v9fs_mknod(void *opaque)
     if (err < 0) {
         goto out;
     }
-    stat_to_qid(&stbuf, &qid);
+    err = stat_to_qid(pdu, &stbuf, &qid);
+    if (err < 0) {
+        goto out;
+    }
     err = pdu_marshal(pdu, offset, "Q", &qid);
     if (err < 0) {
         goto out;
@@ -3222,7 +3258,10 @@ static void coroutine_fn v9fs_mkdir(void *opaque)
     if (err < 0) {
         goto out;
     }
-    stat_to_qid(&stbuf, &qid);
+    err = stat_to_qid(pdu, &stbuf, &qid);
+    if (err < 0) {
+        goto out;
+    }
     err = pdu_marshal(pdu, offset, "Q", &qid);
     if (err < 0) {
         goto out;
@@ -3633,6 +3672,8 @@ int v9fs_device_realize_common(V9fsState *s, const 
V9fsTransport *t,
         goto out;
     }
 
+    s->dev_id = stat.st_dev;
+
     s->ctx.fst = &fse->fst;
     fsdev_throttle_init(s->ctx.fst);
 
diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
index 8883761b2c..5e316178d5 100644
--- a/hw/9pfs/9p.h
+++ b/hw/9pfs/9p.h
@@ -256,6 +256,7 @@ struct V9fsState
     Error *migration_blocker;
     V9fsConf fsconf;
     V9fsQID root_qid;
+    dev_t dev_id;
 };
 
 /* 9p2000.L open flags */
-- 
2.11.0