[Qemu-devel] [PATCH -V4 7/7] virtio-9p: Implemented security model for chown and chgrp.

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

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
---
 hw/file-op-9p.h      |    4 ++--
 hw/virtio-9p-local.c |   18 ++++++++++++++----
 hw/virtio-9p.c       |   15 ++++++++++++---
 3 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index c1c08b4..877faf2 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -49,8 +49,8 @@ typedef struct FileOperations
 {
     int (*lstat)(FsContext *, const char *, struct stat *);
     ssize_t (*readlink)(FsContext *, const char *, char *, size_t);
-    int (*chmod)(FsContext *, const char *, mode_t);
-    int (*chown)(FsContext *, const char *, uid_t, gid_t);
+    int (*chmod)(FsContext *, const char *, FsCred *);
+    int (*chown)(FsContext *, const char *, FsCred *);
     int (*mknod)(FsContext *, const char *, FsCred *);
     int (*utime)(FsContext *, const char *, const struct utimbuf *);
     int (*remove)(FsContext *, const char *);
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 11f3650..f46acac 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -173,9 +173,14 @@ static ssize_t local_writev(FsContext *ctx, int fd, const struct iovec *iov,
     return writev(fd, iov, iovcnt);
 }
 
-static int local_chmod(FsContext *ctx, const char *path, mode_t mode)
+static int local_chmod(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
-    return chmod(rpath(ctx, path), mode);
+    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 chmod(rpath(fs_ctx, path), credp->fc_mode);
+    }
+    return -1;
 }
 
 static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp)
@@ -436,9 +441,14 @@ 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 90620aa..dceb5fc 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -154,7 +154,11 @@ static int v9fs_do_writev(V9fsState *s, int fd, const struct iovec *iov,
 
 static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
 {
-    return s->ops->chmod(&s->ctx, path->data, mode);
+    FsCred cred;
+    cred_init(&cred);
+    cred.fc_mode = mode;
+
+    return s->ops->chmod(&s->ctx, path->data, &cred);
 }
 
 static int v9fs_do_mknod(V9fsState *s, V9fsCreateState *vs, mode_t mode,
@@ -231,7 +235,12 @@ 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,
@@ -2022,7 +2031,7 @@ 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