GNU bug report logs - #55023
Issue with CP empty folder after y2038 on 32-bits Kernel

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From: Adhemerval Zanella <adhemerval.zanella <at> linaro.org>
To: Pádraig Brady <P <at> draigBrady.com>, Arnaud Panaïotis <arnaud.panaiotis <at> gmx.fr>, 55023-done <at> debbugs.gnu.org
Subject: bug#55023: Issue with CP empty folder after y2038 on 32-bits Kernel
Date: Thu, 28 Apr 2022 10:22:11 -0300

On 27/04/2022 13:42, Pádraig Brady wrote:
> Marking this as done in the coreutils bug tracker,
> now that this is being tracked in glibc.
> 
> thank you!
> 
> On 27/04/2022 13:46, Adhemerval Zanella wrote:
> 
>>>>>>> On 21/04/2022 14:36, Pádraig Brady wrote:
>>>>>>>> That suggests the kernel (statx) returns fine,
>>>>>>>> but glibc's fstatat64 is returning the EOVERFLOW.
> 
>> It seems to be a glibc missing support indeed.  The coreutils issues indicates
>> that lchmodat failed somehow:
>>
>>                if (lchmodat (dst_dirfd, dst_relname, dst_mode | S_IRWXU) != 0)
>>                  {
>>                    error (0, errno, _("setting permissions for %s"),
>>                           quoteaf (dst_name));
>>                    goto un_backup;
>>                  }
>>
>> And lchmodat is a gnulib wrapper for fchmodat:
>>
>> CHMODAT_INLINE int
>> lchmodat (int fd, char const *file, mode_t mode)
>> {
>>    return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);
>> }
>>
>> And since Linux fchmodat syscall does not provide a 'flag' argument (to
>> handle AT_SYMLINK_NOFOLLOW), glibc emulates it through opening a procfs file
>> descriptor, issuing fstatat to check if it is link (since some kernels and
>> filesystem it returns in inconsistent results), and then issue chmod.
>>
>> However, the glibc internal fstat does not use the 64-bit version, which
>> then results in EOVERFLOW.
>>
>> I have opened https://sourceware.org/bugzilla/show_bug.cgi?id=29097 and I will
>> fix it upstream and backport to 2.34 and 2.35.
> 

It is now fixed on master, 2.35, and 2.34 branches.

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