[Qemu-devel] [PATCH-V5 04/10] virtio-9p: Security model for chown

["Venkateswararao Jujjuri (JV)" <jvrao@linux.vnet.ibm.com>]

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
---
 hw/file-op-9p.h      |    2 +-
 hw/virtio-9p-local.c |    9 +++++++--
 hw/virtio-9p.c       |    9 +++++++--
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index 1c8d89b..a53cd35 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -50,7 +50,7 @@ typedef struct FileOperations
     int (*lstat)(FsContext *, const char *, struct stat *);
     ssize_t (*readlink)(FsContext *, const char *, char *, size_t);
     int (*chmod)(FsContext *, const char *, FsCred *);
-    int (*chown)(FsContext *, const char *, uid_t, gid_t);
+    int (*chown)(FsContext *, const char *, FsCred *);
     int (*mknod)(FsContext *, const char *, mode_t, dev_t);
     int (*mksock)(FsContext *, const char *);
     int (*utime)(FsContext *, const char *, const struct utimbuf *);
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 9bdcf02..0a21591 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -240,9 +240,14 @@ static int local_rename(FsContext *ctx, const char *oldpath,
 
 }
 
-static int local_chown(FsContext *ctx, const char *path, uid_t uid, gid_t gid)
+static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
-    return chown(rpath(ctx, path), uid, gid);
+    if (fs_ctx->fs_sm == SM_MAPPED) {
+        return local_set_xattr(rpath(fs_ctx, path), credp);
+    } else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
+        return chown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
+    }
+    return -1;
 }
 
 static int local_utime(FsContext *ctx, const char *path,
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 24291f4..fa459c9 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -209,7 +209,12 @@ static int v9fs_do_rename(V9fsState *s, V9fsString *oldpath,
 
 static int v9fs_do_chown(V9fsState *s, V9fsString *path, uid_t uid, gid_t gid)
 {
-    return s->ops->chown(&s->ctx, path->data, uid, gid);
+    FsCred cred;
+    cred_init(&cred);
+    cred.fc_uid = uid;
+    cred.fc_gid = gid;
+
+    return s->ops->chown(&s->ctx, path->data, &cred);
 }
 
 static int v9fs_do_utime(V9fsState *s, V9fsString *path,
@@ -2014,7 +2019,7 @@ static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
         goto out;
     }
 
-    if (vs->v9stat.n_gid != -1) {
+    if (vs->v9stat.n_gid != -1 || vs->v9stat.n_uid != -1) {
         if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
                     vs->v9stat.n_gid)) {
             err = -errno;
-- 
1.6.5.2