[edk2-devel] : Query regarding IsTextShdr inside Basetools

[Mukesh Ojha]

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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