Re: [PATCH 00/12] x86/CET: The last 12 patches to enable Intel CET

["H.J. Lu" <hjl dot tools at gmail dot com>]

On Fri, Jul 27, 2018 at 10:13 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Fri, Jul 27, 2018 at 9:49 AM, Florian Weimer <fweimer@redhat.com> wrote:
>> On 07/27/2018 06:47 PM, H.J. Lu wrote:
>>>
>>> On Fri, Jul 27, 2018 at 9:44 AM, Florian Weimer <fweimer@redhat.com>
>>> wrote:
>>>>
>>>> On 07/27/2018 06:37 PM, H.J. Lu wrote:
>>>>
>>>>>> We load datasz and then check for having encountered the last note.
>>>>>> I'm
>>>>>> checking a fix.
>>>>>
>>>>>
>>>>>
>>>>> How can I reproduce it?
>>>>
>>>>
>>>>
>>>> Perhaps it is only visible with an explicit invocation of the dynamic
>>>> linker?
>>>>
>>>> I saw it while building GCC on Fedora rawhide.  I've pushed my latest
>>>> changes (commit a4a5659439698554d18b9f1ef56cbd86591e217b) to the
>>>> distribution Git, even though they do not build.  The valgrind check at
>>>> the
>>>> end of the build fails.
>>>
>>>
>>> What is the command line to reproduce it with glibc build configured
>>> with --enable-cet?
>>
>>
>> This command is run inside the build directory:
>>
>> elf/ld.so --library-path .:elf:nptl:dlfcn /usr/bin/valgrind --vgdb-error=1
>> --track-origins=yes --error-exitcode=1 elf/ld.so --library-path
>> .:elf:nptl:dlfcn /usr/bin/true
>>
>
> [hjl@gnu-cet-2 build-x86_64-linux]$ elf/ld.so --library-path
> .:elf:nptl:dlfcn /usr/bin/valgrind --vgdb-error=1 --track-origins=yes
> --error-exitcode=1 elf/ld.so --library-path .:elf:nptl:dlfcn
> /usr/bin/true
>

Your note may be different.  Mine has

[hjl@gnu-cet-1 build-x86_64-linux]$ readelf -n elf/ld.so

Displaying notes found in: .note.gnu.build-id
  Owner                 Data size Description
  GNU                  0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)
    Build ID: 47063ae06339e7226b68aa983cd3225f2dfa1ee2

Displaying notes found in: .note.gnu.property
  Owner                 Data size Description
  GNU                  0x00000010 NT_GNU_PROPERTY_TYPE_0
      Properties: x86 feature: IBT, SHSTK
[hjl@gnu-cet-1 build-x86_64-linux]$

Can you send me your elf/ld.so?

-- 
H.J.