Re: [PATCH, cross prelink] 0001-Pull-ld.so-s-name-from-PT_INTERP-to-avoid-the-runtim.patch

[Maxim Kuvyrkov <maxim@codesourcery.com>]

Ping.

--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics


On 30/05/2012, at 3:17 AM, Mark Hatle wrote:

> This was just an oversight it appears.  I'm working on a number of merges into the cross prelinker today.  Hopefully in a few days it will be tested and pushed.  If you don't see anything, feel free to keep reminding me.
> 
> --Mark
> 
> On 5/25/12 10:42 PM, Maxim Kuvyrkov wrote:
>> On 11/04/2012, at 8:23 AM, Mark Hatle wrote:
>> 
>>> On 4/10/12 2:56 PM, Maxim Kuvyrkov wrote:
>>>> On 11/04/2012, at 7:46 AM, Mark Hatle wrote:
>>>> 
>>>>> On 4/10/12 2:27 PM, Maxim Kuvyrkov wrote:
>>>>>> Mark,
>>>>>> 
>>>>>> This patch makes rtld emulator in cross prelink use ld.so's name as it is encoded in PT_INTERP header.
>>>>>> 
>>>>>> Currently, rtld emulator returns "lib/ld.so.1" for runtime linker's name, but the linker actually expects "/lib/ld.so.1" -- that one slash at the beginning causes prelink checks done by the runtime linker to fail and not use prelink information.
>>>>>> 
>>>>>> The runtime linker sets up a map for itself under the name stored in PT_INTERP header of the executable, and this patch makes rtld emulator follow the suit.
>>>>>> 
>>>>>> I have tested this patch using a different version of rtld emulator (the one that CodeSourcery / Mentor maintains), but the function in question is the same in both, so this patch is also relevant for Yocto's prelink.
>>>>>> 
>>>>>> Any comments?  Please merge at your leisure.
>>>>> 
>>>>> prelinker currently checks that the ld.so name matches what it's expecting for any given arch in the PL_ARCH structure.  Does this change any of that behavior?  Or does it simply change the internal prelink-rtld behavior so that it the prelink-rtld acts as if it's name is the PT_INTERP element?
>>>> 
>>>> It is the latter.  Only behavior of prelink-rtld is change to the effect that it outputs "/lib/ld.so.1 ->   /lib/ld.so.1 ..." as executable's dependency.
>>>> 
>>>> Forgot to mention: the dependency on ld.so.1 [usually] comes from libdl.so, which is, probably, why this bug wasn't noticed before.
>>> 
>>> Thanks, I think I understand what is going on now.  I'll look into getting this merged into the cross prelinker later today or tomorrow.
>> 
>> Mark,
>> 
>> This patch is still not merged to cross-prelink, did you encounter a problem with it?
>> 
>> Thank you,
>> 
>> --
>> Maxim Kuvyrkov
>> CodeSourcery / Mentor Graphics
>