On Wed, Jan 16, 2019 at 11:27:45PM +0100, Christian Brauner wrote:
> This adds the promised selftest for binderfs. It will verify the following
> things:
> - binderfs mounting works
> - binder device allocation works
> - performing a binder ioctl() request through a binderfs device works
> - binder device removal works
> - binder-control removal fails
> - binderfs unmounting works
>
> Cc: Todd Kjos <tk...@google.com>
> Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
> ---
> /* Changelog */
>
> v1:
> - check for ENODEV on mount failure to detect whether binderfs is
> available
> If it is not, skip the test and exit with success.
> ---
> tools/testing/selftests/Makefile | 1 +
> .../selftests/filesystems/binderfs/.gitignore | 1 +
> .../selftests/filesystems/binderfs/Makefile | 6 +
> .../filesystems/binderfs/binderfs_test.c | 126 ++++++++++++++++++
> .../selftests/filesystems/binderfs/config | 3 +
> 5 files changed, 137 insertions(+)
> create mode 100644 tools/testing/selftests/filesystems/binderfs/.gitignore
> create mode 100644 tools/testing/selftests/filesystems/binderfs/Makefile
> create mode 100644
> tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> create mode 100644 tools/testing/selftests/filesystems/binderfs/config
>
> diff --git a/tools/testing/selftests/Makefile
> b/tools/testing/selftests/Makefile
> index 1a2bd15c5b6e..400ee81a3043 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -10,6 +10,7 @@ TARGETS += drivers/dma-buf
> TARGETS += efivarfs
> TARGETS += exec
> TARGETS += filesystems
> +TARGETS += filesystems/binderfs
> TARGETS += firmware
> TARGETS += ftrace
> TARGETS += futex
> diff --git a/tools/testing/selftests/filesystems/binderfs/.gitignore
> b/tools/testing/selftests/filesystems/binderfs/.gitignore
> new file mode 100644
> index 000000000000..8a5d9bf63dd4
> --- /dev/null
> +++ b/tools/testing/selftests/filesystems/binderfs/.gitignore
> @@ -0,0 +1 @@
> +binderfs_test
> diff --git a/tools/testing/selftests/filesystems/binderfs/Makefile
> b/tools/testing/selftests/filesystems/binderfs/Makefile
> new file mode 100644
> index 000000000000..58cb659b56b4
> --- /dev/null
> +++ b/tools/testing/selftests/filesystems/binderfs/Makefile
> @@ -0,0 +1,6 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +CFLAGS += -I../../../../../usr/include/
> +TEST_GEN_PROGS := binderfs_test
> +
> +include ../../lib.mk
> diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> new file mode 100644
> index 000000000000..34361efcb9c8
> --- /dev/null
> +++ b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> @@ -0,0 +1,126 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#define _GNU_SOURCE
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <sched.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/ioctl.h>
> +#include <sys/mount.h>
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <linux/android/binder.h>
> +#include <linux/android/binderfs.h>
> +#include "../../kselftest.h"
> +
> +int main(int argc, char *argv[])
> +{
> + int fd, ret, saved_errno;
> + size_t len;
> + struct binderfs_device device = { 0 };
> + struct binder_version version = { 0 };
> +
> + ret = unshare(CLONE_NEWNS);
> + if (ret < 0)
> + ksft_exit_fail_msg("%s - Failed to unshare mount namespace\n",
> + strerror(errno));
> +
> + ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
> + if (ret < 0)
> + ksft_exit_fail_msg("%s - Failed to mount / as private\n",
> + strerror(errno));
> +
> + ret = mkdir("/dev/binderfs", 0755);
> + if (ret < 0 && errno != EEXIST)
> + ksft_exit_fail_msg(
> + "%s - Failed to create binderfs mountpoint\n",
> + strerror(errno));
> +
> + ret = mount(NULL, "/dev/binderfs", "binder", 0, 0);
> + if (ret < 0) {
> + if (errno != ENODEV)
> + ksft_exit_fail_msg("%s - Failed to mount binderfs\n",
> + strerror(errno));
> +
> + ksft_test_result_skip(
> + "The Android binderfs filesystem is not available\n");
> + ksft_exit_pass();
Do you have to clean up your new directory you created and the mount?
Or does exiting the code here somehow undo the unshare/mount/mkdir steps
above??
Same type of question for the failure paths of the mkdir and mount calls.
> + }
> +
> + /* binderfs mount test passed */
> + ksft_inc_pass_cnt();
> +
> + memcpy(device.name, "my-binder", strlen("my-binder"));
> +
> + fd = open("/dev/binderfs/binder-control", O_RDONLY | O_CLOEXEC);
> + if (fd < 0)
> + ksft_exit_fail_msg(
> + "%s - Failed to open binder-control device\n",
> + strerror(errno));
No cleanup? Same for other calls to ksft_exit_fail_msg() later in this
file.
thanks,
greg "error handling is hard!" k-h
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