[LTP] [PATCH v2] cve/cve-2016-10044.c: fix two errors

[Xiao Yang <yangx.jy@cn.fujitsu.com>]

Hi Cyril,

Could you help me review this patch? Thanks a lot. :-)

Thanks,
Xiao Yang
On 2017/09/26 10:04, Xiao Yang wrote:
> 1) If the number of nr_events exceeds the limit of available events
>    defined in /proc/sys/fs/aio-max-nr, it returns EAGAIN.  We should
>    call io_destroy() to cleanup the AIO context after finishing test.
>
>    Steps to reproduce this error:
>       #echo 4 > /proc/sys/fs/aio-max-nr
>       # ./cve-2016-10044 -i 5
>       tst_test.c:908: INFO: Timeout per run is 0h 05m 00s
>       cve-2016-10044.c:62: FAIL: AIO mapping is executable: rwxs!
>       cve-2016-10044.c:62: FAIL: AIO mapping is executable: rwxs!
>       cve-2016-10044.c:62: FAIL: AIO mapping is executable: rwxs!
>       cve-2016-10044.c:62: FAIL: AIO mapping is executable: rwxs!
>       cve-2016-10044.c:49: BROK: Failed to create AIO context: EAGAIN/EWOULDBLOCK
>
> 2) This case fails with TBROK on an old kernel(e.g. v2.6.32) because
>    the mapping file does not exist.
>
>    The old format of file is set to 'anon_inode:[aio]' by the following
>    patch set:
>    '55708698c5f1("fs/anon_inode: Introduce a new lib function anon_inode_getfile_private()")'
>    '36bc08cc0170("fs/aio: Add support to aio ring pages migration")'
>
>    The current format of file is set to '/[aio]' by the following patch:
>    '71ad7490c1f3("rework aio migrate pages to use aio fs")'
>
>    We change the keyword into '[aio]' to match as many formats as
>    possible, and return TCONF if the mapping file does not exist.
>
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>  testcases/cve/cve-2016-10044.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/testcases/cve/cve-2016-10044.c b/testcases/cve/cve-2016-10044.c
> index 7928d27..14fa0a4 100644
> --- a/testcases/cve/cve-2016-10044.c
> +++ b/testcases/cve/cve-2016-10044.c
> @@ -50,10 +50,10 @@ static void run(void)
>  
>  	f = SAFE_FOPEN("/proc/self/maps", "r");
>  	while (fgets(line, BUFSIZ, f) != NULL) {
> -		if (strstr(line, "/[aio]") != NULL)
> +		if (strstr(line, "[aio]") != NULL)
>  			goto found_mapping;
>  	}
> -	tst_brk(TBROK, "Could not find mapping in /proc/self/maps");
> +	tst_brk(TCONF, "Could not find mapping in /proc/self/maps");
>  
>  found_mapping:
>  	if (sscanf(line, "%*x-%*x %s7", perms) < 0)
> @@ -63,6 +63,9 @@ found_mapping:
>  	else
>  		tst_res(TPASS, "AIO mapping is not executable: %s", perms);
>  
> +	if (tst_syscall(__NR_io_destroy, ctx))
> +		tst_brk(TBROK | TERRNO, "Failed to destroy AIO context");
> +
>  	SAFE_FCLOSE(f);
>  	f = NULL;
>  }