@@ -227,6 +227,44 @@ static void chroot_do_open(V9fsFileObjectRequest *request, FdInfo *fd_info)
}
}
+/*
+ * Helper routine to create a file and return the file descriptor and
+ * error status in FdInfo structure.
+ */
+static void chroot_do_create(V9fsFileObjectRequest *request, FdInfo *fd_info)
+{
+ uid_t cur_uid;
+ gid_t cur_gid;
+
+ cur_uid = geteuid();
+ cur_gid = getegid();
+
+ fd_info->fi_fd = -1;
+
+ if (setfsuid(request->data.uid) < 0) {
+ fd_info->fi_error = errno;
+ return;
+ }
+ if (setfsgid(request->data.gid) < 0) {
+ fd_info->fi_error = errno;
+ goto unset_uid;
+ }
+
+ fd_info->fi_fd = open(request->path.path, request->data.flags,
+ request->data.mode);
+
+ if (fd_info->fi_fd < 0) {
+ fd_info->fi_error = errno;
+ } else {
+ fd_info->fi_error = 0;
+ fd_info->fi_flags = FI_FDVALID;
+ }
+
+ setfsgid(cur_gid);
+unset_uid:
+ setfsuid(cur_uid);
+}
+
static int chroot_daemonize(int chroot_sock)
{
sigset_t sigset;
@@ -324,6 +362,9 @@ int v9fs_chroot(FsContext *fs_ctx)
case T_OPEN:
chroot_do_open(&request, &fd_info);
break;
+ case T_CREATE:
+ chroot_do_create(&request, &fd_info);
+ break;
default:
fd_info.fi_fd = 0;
fd_info.fi_error = EIO;
@@ -52,6 +52,23 @@ static int passthrough_open(FsContext *fs_ctx, const char *path, int flags)
return fd;
}
+static int passthrough_create(FsContext *fs_ctx, const char *path, int flags,
+ FsCred *credp)
+{
+ V9fsFileObjectRequest request;
+ int fd, error = 0;
+
+ fill_request(&request, path, credp);
+ request.data.flags = flags;
+ request.data.type = T_CREATE;
+ fd = v9fs_request(fs_ctx, &request, &error);
+ if (fd < 0) {
+ errno = error;
+ }
+ qemu_free((void *)request.path.path);
+ return fd;
+}
+
static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
{
int err;
@@ -376,8 +393,7 @@ static int local_open2(FsContext *fs_ctx, const char *path, int flags,
serrno = errno;
goto err_end;
}
- } else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) ||
- (fs_ctx->fs_sm == SM_NONE)) {
+ } else if (fs_ctx->fs_sm == SM_NONE) {
fd = open(rpath(fs_ctx, path), flags, credp->fc_mode);
if (fd == -1) {
return fd;
@@ -387,6 +403,8 @@ static int local_open2(FsContext *fs_ctx, const char *path, int flags,
serrno = errno;
goto err_end;
}
+ } else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
+ fd = passthrough_create(fs_ctx, path, flags, credp);
}
return fd;
Add both server & client side interfaces to create regular files in chroot environment Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> --- hw/9pfs/virtio-9p-chroot.c | 41 +++++++++++++++++++++++++++++++++++++++++ hw/9pfs/virtio-9p-local.c | 22 ++++++++++++++++++++-- 2 files changed, 61 insertions(+), 2 deletions(-)