[Bug ld/26047] New: Don't allow linking ET_EXEC

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26047

            Bug ID: 26047
           Summary: Don't allow linking ET_EXEC
           Product: binutils
           Version: 2.35 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

% as /dev/null -o a.o
% ld.bfd a.o -o a
ld.bfd: warning: cannot find entry symbol _start; defaulting to
0000000000401000
# a is an ET_EXEC

## GNU ld allows input ET_EXEC like an ET_REL
% ld.bfd a -o b  
ld.bfd: warning: cannot find entry symbol _start; not setting start address

## gold disallows input ET_EXEC
% gold a -o b
gold: error: a: unsupported ELF file type 2

Accepting ET_EXEC may cause problems which will be hard to diagnose.


The Linux kernel for a narrow window misused ET_EXEC as an input, which was
fixed by my
https://git.kernel.org/torvalds/c/90ceddcb495008ac8ba7a3dce297841efcd7d584

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