Re: [PATCH] sha1_file.c:create_tmpfile(): Fix race when creating loose object dirs

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On Fri, Oct 18, 2013 at 8:55 PM, Duy Nguyen <pclouds@xxxxxxxxx> wrote:
> On Fri, Oct 18, 2013 at 8:17 PM, Johan Herland <johan@xxxxxxxxxxx> wrote:
>> diff --git a/sha1_file.c b/sha1_file.c
>> index f80bbe4..00ffffe 100644
>> --- a/sha1_file.c
>> +++ b/sha1_file.c
>> @@ -2857,7 +2857,9 @@ static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename)
>>                 /* Make sure the directory exists */
>>                 memcpy(buffer, filename, dirlen);
>>                 buffer[dirlen-1] = 0;
>> -               if (mkdir(buffer, 0777) || adjust_shared_perm(buffer))
>> +               if (mkdir(buffer, 0777) && errno != EEXIST)
>> +                       return -1;
>> +               if (adjust_shared_perm(buffer))
>>                         return -1;
>
> I was going to ask what if the created directory does not have
> permission 0777. But adjust_shared_perm follows immediately after, so
> we're good.

And I sent too early. adjust_shared_perm() does rely on current dir's
permission. So if the creator does "mkdir(buffer, 0)", we still have a
bad permission in the end. And adjust_shared_perm() is only active
when the repository is configured to be shared.
-- 
Duy
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