> On Sep 1, 2020, at 4:01 AM, Eric Liu wrote:
>
> Hi all,
>
> Please review this simple change to fix some compile warnings.
>
> The newer gcc (gcc-8 or higher) would warn for calls to bounded string
> manipulation functions such as 'strncpy' that may either truncate the
> copied string or leav
> On Sep 1, 2020, at 5:46 AM, Kim Barrett wrote:
>
>> On Sep 1, 2020, at 4:01 AM, Eric Liu wrote:
>>
>> Hi all,
>>
>> Please review this simple change to fix some compile warnings.
>>
>> The newer gcc (gcc-8 or higher) would warn for calls to
> On Sep 2, 2020, at 3:19 AM, Florian Weimer wrote:
>
> * Magnus Ihse Bursie:
>
>> Maybe we should have a common library for all native code where we
>> supply our own string operation functions? It will then be much easier
>> to make sure the implementation passes different compiler versions,
> On Sep 2, 2020, at 2:39 AM, Magnus Ihse Bursie
> wrote:
>
> On 2020-09-01 11:46, Kim Barrett wrote:
>> I really hate -Wstringop-truncation. It's been a constant source of churn
>> for us ever since it appeared. The changes being made to getIndex and
>>
> On Sep 6, 2020, at 1:03 PM, Florian Weimer wrote:
> There is no reason to use strncpy. At least on Linux, the struct field
> needs to be null-terminated, and you need to compute the length for the
> length check. So you might as well use memcpy with the length plus one
> (to copy the null term
> On Sep 4, 2020, at 7:50 AM, Florian Weimer wrote:
>
> * Daniel Fuchs:
>
>> Hi,
>>
>> On 02/09/2020 08:19, Florian Weimer wrote:
>>> At least one of the bugs was in theory user-visible: the network
>>> interface code would return data for an interface that does not actually
>>> exist on the sy
> On Sep 1, 2020, at 9:59 AM, Eric Liu wrote:
> I just tested this patch by GCC (10.1.0) and it would really re-trigger those
> warnings :(
> I have not noticed the history before, but it's really hard to imagine that
> GCC would
> have different behaviors.
Can you be (very) specific about thi
> On Sep 6, 2020, at 9:51 PM, Kim Barrett wrote:
> Oh, good grief! This file contains 3 identical copies of getMTU and
> getFlags, one each for linux, AIX, and BSD. And getIndex is kind of a
> mess. If changing any of these for linux, probably similar changes
> ought to be appli
> On Sep 6, 2020, at 7:35 AM, Kim Barrett wrote:
> src/hotspot/share/compiler/compileBroker.hpp
> 64 PRAGMA_DIAG_PUSH
> 65 PRAGMA_STRINGOP_TRUNCATION_IGNORED
> 66 // This code can incorrectly cause a "stringop-truncation" warning
> with gcc
> 67
> On Sep 6, 2020, at 7:35 AM, Kim Barrett wrote:
> src/java.base/unix/native/libnet/NetworkInterface.c
> 1298 memset((char *)&if2, 0, sizeof(if2));
> 1299 strncpy(if2.ifr_name, name, sizeof(if2.ifr_name) - 1);
> 1300 if2.ifr_name[sizeof(if2.ifr_name) - 1] = 0
> On Sep 7, 2020, at 10:56 AM, Eric Liu wrote:
> I have tested 4 cases for those warnings:
> a) Without my patch, without asan, gcc-8 and gcc-10 are OK.
> b) Without my patch, with asan, gcc-8 has warned, gcc-10 is OK.
> c) With my patch, without asan, gcc-8 and gcc-10 are OK.
That’s *very* stran
> On Sep 7, 2020, at 5:55 AM, Florian Weimer wrote:
>
> * Kim Barrett:
>
>> And strlen is not even necessarily the best solution, as it likely
>> introduces an additional otherwise unnecessary string traversal. For
>> example, getFlags could be changed t
> On Sep 23, 2020, at 2:10 AM, Eric Liu wrote:
>
> Hi Kim,
>
> Sorry for the delay.
>
> This patch removes a redundant string copy in NetworkInterface.c to avoid
> string-truncation
> warning. Other warnings we talked before, which are unable to completely fix
> in different version
> of g
> On Sep 28, 2020, at 11:13 AM, Eric Liu wrote:
>
> Hi,
>
> Thanks for looking at this.
>
> For gcc-10, it's hard to make 'strncpy' all right with asan enabled
> (approaches we talked previous don't work).
> I'm trying to find a better way to avoid using compile pragma. I suppose it
> would
> On Sep 29, 2020, at 6:51 AM, Kim Barrett wrote:
>
>> On Sep 28, 2020, at 11:13 AM, Eric Liu wrote:
>>
>> Hi,
>>
>> Thanks for looking at this.
>>
>> For gcc-10, it's hard to make 'strncpy' all right with asan enabled
>>
> On Sep 30, 2020, at 3:30 AM, Eric Liu wrote:
>
> Hi Kim,
>
> Thanks for your review.
> I tried to solve the problem with your suggestion, and have just one question.
>
>> On 29 September 2020 18:51 PM, Kim Barrett wrote:
>> With gcc10.2, and using the --ena
> On Sep 30, 2020, at 7:09 AM, Magnus Ihse Bursie
> wrote:
>
>
>
> On 2020-09-29 13:17, Kim Barrett wrote:
>> Another option might be to solve
>> https://bugs.openjdk.java.net/browse/JDK-8232187
>>
> Will that really help? If a os::strncpy_s me
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