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Date: Wed, 26 Nov 2014 11:04:38 -0500
From: Daniel Kahn Gillmor <dkg@...thhorseman.net>
To: oss-security@...ts.openwall.com
Subject: Re: AW: O_CREAT|O_DIRECTORY on nonexisting
file expected behaviour?
On 11/26/2014 10:28 AM, Fiedler Roman wrote:
>> Von: Eric Blake [mailto:eblake@...hat.com]
>> But if it succeeds, and did NOT create a directory, then it is in
>> violation of POSIX.
>
> Thanks for the pointer to the POSIX documentation. So it seems to be a
> POSIX-violation, at least on "Linux version 3.2.0-69-generic".
>
> My test program was:
>
> #include <fcntl.h>
> #include <stdio.h>
> #include <sys/stat.h>
>
> int main(int argc, char **argv) {
> int fd;
> struct stat statBuf;
> int result;
>
> fd=open("xxx", O_RDWR|O_CREAT|O_DIRECTORY, 0600);
> result=fstat(fd, &statBuf);
> if(result) {
> fprintf(stderr, "Stat failed\n");
> return(1);
> }
> fprintf(stderr, "New element type is %d\n", S_ISDIR(fd));
> return(0);
> }
I just tried the above on debian's 3.17-1-amd64 (3.17-1~exp1, and it
produces:
New element type is 0
So if it's a violation, it hasn't been fixed between 3.2 and 3.17.
--dkg
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