[edk2-devel] : Query regarding IsTextShdr inside Basetools

[Laszlo Ersek]

On 11/11/20 23:40, Laszlo Ersek wrote:
> Ard, Liming,
> 
> can you please take a look?
> 
> Thanks!
> Laszlo

Darn, I used Liming's old email address. Correcting it now. Sorry!

Laszlo

> 
> On 11/10/20 14:07, Mukesh Ojha wrote:
>> Hi All,
>>
>> I have a doubt about the check we have put inside IsTextShdr() .
>>
>> STATIC
>> BOOLEAN
>> IsTextShdr (
>>   Elf_Shdr *Shdr
>>   )
>> {
>>   return (BOOLEAN) ((Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) ==
>> SHF_ALLOC);
>> }
>>
>>
>> We are observing one issue where while generate EFI using GenFW in EDK2
>> because test/data section offset is different than calculated
>> mCoffSectionsOffset when scanning sections.
>> I run GenFW with a failure dll in my local after adding some logs into
>> GenFW. and found that “mCoffSectionsOffset” for data section seems not
>> to have expected value due to
>> “.note.gnu.property” size. Because compiled dll has “.note.gnu.property”
>> section with alloc flag and GenFW thinks that it’s a text section if
>> alloc flag is set.
>> So its size is added to the mCoffSectionsOffset.
>>
>> Could you please give us an advice whether we can fix IsTextShdr()
>> function like below ?
>>
>>
>> --- a/BaseTools/Source/C/GenFw/Elf64Convert.c
>> +++ b/BaseTools/Source/C/GenFw/Elf64Convert.c
>> @@ -229,7 +229,7 @@ IsTextShdr (
>>    Elf_Shdr *Shdr
>>    )
>> {
>> -  return (BOOLEAN) ((Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) ==
>> SHF_ALLOC);
>> +  return (BOOLEAN) ((Shdr->sh_flags & (SHF_EXECINSTR | SHF_WRITE |
>> SHF_ALLOC)) == (SHF_ALLOC | SHF_EXECINSTR));^
>>
>>
>> Thanks,
>> Mukesh
>>
>>
>> 
>>
>>
> 



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