RFR(xs): 8165936: Potential Heap buffer overflow when seaching timezone info files

Masayoshi Okutsu masayoshi.okutsu at oracle.com
Tue Sep 13 15:25:34 UTC 2016

Looks good to me. Thank you for fixing this bug!


On 9/13/2016 11:49 PM, Thomas Stüfe wrote:
> Hi Christoph, thanks for your review! Yes, I can remove the blank.
> Kind Regards, Thomas
> On Tue, Sep 13, 2016 at 2:35 PM, Langer, Christoph <christoph.langer at sap.com
>> wrote:
>> Hi Thomas,
>> your change looks good. I'm also forwarding this to i18n-dev as issues in
>> TimeZone implementation are mostly handled there.
>> One remark: Can you take the opportunity to also remove the blank between
>> the cast and malloc in line 150: "(struct dirent64 *) malloc..."?
>> Unfortunately I'm no reviewer, so you still need an official review.
>> Best regards
>> Christoph
>>> -----Original Message-----
>>> From: core-libs-dev [mailto:core-libs-dev-bounces at openjdk.java.net] On
>> Behalf
>>> Of Thomas Stüfe
>>> Sent: Dienstag, 13. September 2016 12:54
>>> To: Java Core Libs <core-libs-dev at openjdk.java.net>
>>> Subject: RFR(xs): 8165936: Potential Heap buffer overflow when seaching
>>> timezone info files
>>> Dear all,
>>> please take a look at this small change:
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8165936
>>> Webrev:
>>> http://cr.openjdk.java.net/~stuefe/webrevs/8165936-
>> Potential-Heap-buffer-
>>> overflow-when-seaching-timezone-info-files/webrev.00/webrev/
>>> readdir_r is used to iterate over the content of a system directory, but
>>> the buffer passed to it is too small: Its size should include the size of
>>> the dirent structure itself (minus the d_name member).
>>> The fix also now checks the return code of pathconf(), and if pathconf()
>>> returns an error, falls back to the NAME_MAX compile time constant.
>>> Finally, it imposes a minimum size for the buffer, because on older
>> System
>>> V systems NAME_MAX may be surprisingly small and readdir_r will not check
>>> the output buffer size. I think it is better to err on the safe side
>> here.
>>> Kind Regards, Thomas

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