linux-kernel - Re: [PATCH 1/2] selftests/filesystems: devpts

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Date:   Thu, 10 May 2018 11:26:17 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Christian Brauner <christian.brauner@...onical.com>,
        Anders Roxell <anders.roxell@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 1/2] selftests/filesystems: devpts_pts included wrong
 header

On 05/04/2018 01:42 PM, Shuah Khan wrote:
> On 05/02/2018 08:05 AM, Christian Brauner wrote:
>> On Wed, Apr 18, 2018 at 09:52:55AM +0200, Anders Roxell wrote:
>>> We were picking up the wrong header should use asm/ioctls.h form the kernel
>>> and not the header from the system (sys/ioctl.h). In the current code we
>>> added the correct include and we added the kernel headers path to the CFLAGS.
>>>
>>> Fixes: ce290a19609d ("selftests: add devpts selftests")
>>> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
>>> ---
>>
>> Acked-by: Christian Brauner <christian.brauner@...ntu.com>
>>
>> Patch looks good to me.
>>
>> I'm going to look into the ioctl() error.
>>
>> Thanks!
>> Christian
>>
>>>
>>> Hi,
>>>
>>> I've been running devpts_pts on a mainline kernel (4.16+git0+60cc43fc88) and
>>
>>
>>
>>> the verify_invalid_ptmx_bind_mount() test failes with this failure:
>>>
>>> root@...el-core2-32:~# ./devpts_pts
>>> Failed to perform TIOCGPTPEER ioctl
>>>
>>> However, I'm still confused why I'm not able to get the test to pass.  Strace
>>> showes that -ENOENT return in the TIOCGPTPEER implementation in the
>>> kernel. I think the -ENOENT gets returned from this path
>>> devpts_mntget()->devpts_ptmx_path->path_pts().
>>>
>>> See the strace issue below:
>>> root@...el-core2-32:~# strace ./devpts_pts
>>> execve("./devpts_pts", ["./devpts_pts"], [/* 17 vars */]) = 0
>>> brk(NULL)                               = 0x5634e0092000
>>> mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f459d338000
>>> access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
>>> open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
>>> fstat(3, {st_mode=S_IFREG|0644, st_size=16726, ...}) = 0
>>> mmap(NULL, 16726, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f459d333000
>>> close(3)                                = 0
>>> open("/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
>>> read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\3\2\0\0\0\0\0"..., 832) = 832
>>> fstat(3, {st_mode=S_IFREG|0755, st_size=1681056, ...}) = 0
>>> mmap(NULL, 3787168, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f459cd7b000
>>> mprotect(0x7f459cf0f000, 2093056, PROT_NONE) = 0
>>> mmap(0x7f459d10e000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x193000) = 0x7f459d10e000
>>> mmap(0x7f459d114000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f459d114000
>>> close(3)                                = 0
>>> mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f459d331000
>>> arch_prctl(ARCH_SET_FS, 0x7f459d331700) = 0
>>> mprotect(0x7f459d10e000, 16384, PROT_READ) = 0
>>> mprotect(0x5634debe3000, 4096, PROT_READ) = 0
>>> mprotect(0x7f459d33a000, 4096, PROT_READ) = 0
>>> munmap(0x7f459d333000, 16726)           = 0
>>> ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
>>> unshare(CLONE_NEWNS)                    = 0
>>> mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
>>> mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL) = 0
>>> open("/dev/ptmx", O_RDWR|O_NOCTTY|O_CLOEXEC) = 3
>>> ioctl(3, TIOCSPTLCK, [0])               = 0
>>> ioctl(3, _IOC(0, 0x54, 0x41, 0x00), 0x80102) = 4
>>> clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f459d3319d0) = 4377
>>> wait4(4377, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 4377
>>> --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=4377, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
>>> close(3)                                = 0
>>> close(4)                                = 0
>>> getpid()                                = 4376
>>> open("/tmp/devpts_ptmx_Z6aEvy", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
>>> mount("/dev/pts/ptmx", "/tmp/devpts_ptmx_Z6aEvy", NULL, MS_BIND, NULL) = 0
>>> close(3)                                = 0
>>> open("/tmp/devpts_ptmx_Z6aEvy", O_RDWR|O_NOCTTY|O_CLOEXEC) = 3
>>> ioctl(3, TIOCSPTLCK, [0])               = 0
>>> ioctl(3, _IOC(0, 0x54, 0x41, 0x00), 0x80102) = -1 ENOENT (No such file or directory)
>>> write(2, "Failed to perform TIOCGPTPEER io"..., 36Failed to perform TIOCGPTPEER ioctl
>>> ) = 36
>>> close(3)                                = 0
>>> umount2("/dev/pts", 0)                  = 0
>>> umount2("/dev/ptmx", 0)                 = 0
>>> mkdir("/tmp/devpts_fs_w22bR6", 0700)    = 0
>>> mount("devpts", "/tmp/devpts_fs_w22bR6", "devpts", MS_NOSUID|MS_NOEXEC, "newinstance,ptmxmode=0666,mode=0"...) = 0
>>> open("/tmp/devpts_fs_w22bR6/ptmx", O_RDWR|O_NOCTTY|O_CLOEXEC) = 3
>>> ioctl(3, TIOCSPTLCK, [0])               = 0
>>> ioctl(3, _IOC(0, 0x54, 0x41, 0x00), 0x80102) = 4
>>> clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f459d3319d0) = 4378
>>> wait4(4378, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 4378
>>> --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=4378, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
>>> close(3)                                = 0
>>> close(4)                                = 0
>>> unlink("/tmp/devpts_fs_w22bR6")         = -1 EISDIR (Is a directory)
>>> exit_group(0)                           = ?
>>> +++ exited with 0 +++
>>> root@...el-core2-32:~#
>>>
>>>  tools/testing/selftests/filesystems/Makefile     | 1 +
>>>  tools/testing/selftests/filesystems/devpts_pts.c | 2 +-
>>>  2 files changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/tools/testing/selftests/filesystems/Makefile b/tools/testing/selftests/filesystems/Makefile
>>> index 4e6d09fb166f..427a401aae5c 100644
>>> --- a/tools/testing/selftests/filesystems/Makefile
>>> +++ b/tools/testing/selftests/filesystems/Makefile
>>> @@ -1,5 +1,6 @@
>>>  # SPDX-License-Identifier: GPL-2.0
>>>  TEST_PROGS := dnotify_test devpts_pts
>>> +CFLAGS += -I../../../../usr/include/
>>>  all: $(TEST_PROGS)
>>>
>>>  include ../lib.mk
>>> diff --git a/tools/testing/selftests/filesystems/devpts_pts.c b/tools/testing/selftests/filesystems/devpts_pts.c
>>> index b9055e974289..79420b9d00c7 100644
>>> --- a/tools/testing/selftests/filesystems/devpts_pts.c
>>> +++ b/tools/testing/selftests/filesystems/devpts_pts.c
>>> @@ -8,7 +8,7 @@
>>>  #include <stdlib.h>
>>>  #include <string.h>
>>>  #include <unistd.h>
>>> -#include <sys/ioctl.h>
>>> +#include <asm/ioctls.h>
>>>  #include <sys/mount.h>
>>>  #include <sys/wait.h>
>>>
>>> --
>>> 2.11.0
>>>
>>
> 
> Thanks. I will queue this up for 4.18-rc1
> 
> -- Shuah
> 

Applied to linux-kselftest next for 4.18-rc1.

thanks,
-- Shuah