[LTP] [PATCH v3 5/5] kernel/syscalls: add new test with 'open() + O_TMPFILE'

[Alexey Kodanev]

Hi Jan,

On 04/25/2016 05:35 PM, Jan Stancek wrote:
>
>
>
> ----- Original Message -----
>> From: "Alexey Kodanev" <alexey.kodanev@oracle.com>
>> To: ltp@lists.linux.it
>> Cc: "vasily isaenko" <vasily.isaenko@oracle.com>
>> Sent: Friday, 29 January, 2016 1:05:50 PM
>> Subject: [LTP] [PATCH v3 5/5] kernel/syscalls: add new test with 'open() +	O_TMPFILE'
>>
>> Test does the following steps:
>> * create an unnamed temporary file in TMP directory,
>> * write data into it,
>> * check that file not visible in the filesystem,
>> * name the file and check that it becomes visible in FS,
>> * create multiple directories and related temporary files,
>> * create multiple directories and link files into them. Check
>>    that files permissions correspond to the ones specified with
>>    open()/openat().
>>
>> 'openat() + O_TMPFILE' test repeats the same steps.
>>
>> Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
> Alexey,
>
> do you know if this maybe depends on some config option or
> support on glibc side?
>
> I'm running 4.5 kernel and both open14 and openat03 are failing
> for me. I tried xfs and ext4, both failed.
>
> ...
> chdir("/tmp/opepC2qHH")                 = 0
> openat(AT_FDCWD, ".", O_RDWR|O_DIRECTORY|0x400000) = 3
> close(3)                                = 0
> umask(0)                                = 022
> umask(022)                              = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x3ff816c0000
> write(1, "open14      0  TINFO  :  create "..., 75open14      0  TINFO  :  create multiple directories, link files into them
> ) = 75
> write(1, "open14      0  TINFO  :  and che"..., 52open14      0  TINFO  :  and check file permissions
> ) = 52
> mkdirat(AT_FDCWD, "tst03_0", 0700)      = 0
> chdir("tst03_0")                        = 0
> openat(AT_FDCWD, ".", O_RDWR|O_DIRECTORY|0x400000) = 3
> write(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> write(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> write(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> write(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> lseek(3, 0, SEEK_SET)                   = 0
> read(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> read(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> read(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> read(3, "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"..., 1024) = 1024
> linkat(AT_FDCWD, "/proc/self/fd/3", AT_FDCWD, "tmpfile_3", AT_SYMLINK_FOLLOW) = 0
> newfstatat(AT_FDCWD, "tmpfile_3", {st_mode=S_IFREG, st_size=4096, ...}, AT_SYMLINK_NOFOLLOW) = 0
> write(1, "open14      1  TFAIL  :  open14."..., 74open14      1  TFAIL  :  open14.c:212: file mode read 0, but expected 755

If the issue with mode... it can be because glibc doesn't process mode
argument unless O_CREAT is found. In our case we have O_TMPFILE instead.

Here is the link to bugzilla:

"open() and openat() ignore 'mode' with O_TMPFILE"
https://sourceware.org/bugzilla/show_bug.cgi?id=17523

Thanks,
Alexey

> Regards,
> Jan