On Tue, Nov 17, 2020 at 7:49 PM Mark Wielaard <m...@klomp.org> wrote: > > Hi Navin, > > On Fri, 2020-11-13 at 20:45 +0530, Navin P via Elfutils-devel wrote: > > make elflint ignore it rather error as unsupported type. Other tools > > like > > readelf , objdump understand this section. > > Is there a specification of this section type? > > diff --git a/libelf/elf.h b/libelf/elf.h > > index 6439c1a4..26420b45 100644 > > --- a/libelf/elf.h > > +++ b/libelf/elf.h > > @@ -444,6 +444,7 @@ typedef struct > > #define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */ > > #define SHT_NUM 19 /* Number of defined types. */ > > #define SHT_LOOS 0x60000000 /* Start OS-specific. */ > > +#define SHT_LLVM_ADDRSIG 0x6FFF4C03 /* llvm address sig */ > > #define SHT_GNU_ATTRIBUTES 0x6ffffff5 /* Object attributes. */ > > #define SHT_GNU_HASH 0x6ffffff6 /* GNU-style hash table. */ > > #define SHT_GNU_LIBLIST 0x6ffffff7 /* Prelink library list */ > > elf.h comes from the glibc project. > We should first try to upstream new constants there > (glibc-al...@sourceware.org) > > > diff --git a/src/elflint.c b/src/elflint.c > > index ef3e3732..62663800 100644 > > --- a/src/elflint.c > > +++ b/src/elflint.c > > @@ -3905,6 +3905,7 @@ section [%2zu] '%s': size not multiple of entry > > size\n"), > > && shdr->sh_type != SHT_GNU_ATTRIBUTES > > && shdr->sh_type != SHT_GNU_LIBLIST > > && shdr->sh_type != SHT_CHECKSUM > > + && shdr->sh_type != SHT_LLVM_ADDRSIG > > && shdr->sh_type != SHT_GNU_verdef > > && shdr->sh_type != SHT_GNU_verneed > > && shdr->sh_type != SHT_GNU_versym > > Note that for various of these SHT_GNU extensions we actually do have > some extra checks. Do we need to check anything for a section marked > SHT_LLVM_ADDRSIG? > We can do two things here a) Recognize the section exists but ignore its contents which is what i do. This needn't be the correct approach. You may need to check the contents to sht_llvm_addrsig but that is lot of work after the format has been frozen. https://www.mail-archive.com/netdev@vger.kernel.org/msg348254.html readelf output [22] .llvm_addrsig LOOS+0xfff4c03 0000000000000000 ...
b) If we don't want to recognize SHT_LLVM_ADDRSIG you can strip section from object file by objcopy -R .llvm_addrsig size.o conditionally based on clang compiler.
