A plugin inserting only valid linker scripts causes ld to hang

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If a plugin claims a file using the plugin api as described by
https://gcc.gnu.org/wiki/whopr/driver adds an input file which can be
parsed as a valid linker script, ld hangs.

A minimal example to reproduce this behavior is included.

In my testing, main.c can be any valid c source code and inserted_file can
be any valid linker script; for simplicity in this test case, I've left
them both as empty files as the bug does not depend on their contents

Incorrect behavior:
ld hangs

Expected behavior:
linking finishes as normal

ld versions:
2.38 (distributed with Ubuntu 22.04)
2.45.50.20251207 (built from commit
4afeaca0dd1ce9244311dcc354ed5bc5fff5227e with gcc 15.2.1)

patches: none

Suggested cause:
I haven't worked with the code base before, so this could of course be
flawed.
My analysis however, after stepping through with a debugger is the
following:

Plugins are required to 'capture' some input file (normally, the file still
containing IR that's going to go through LTO). The injected files
essentially replace the captured files during the linking process.

In order to preserve the correct link order though, those injected files
should be in the location of the captured file.

Among other things, ldlang.c->lang_process is responsible for restoring
that correct order. Lang_process calls lang_list_remove_tail to move new
data out of each of file_chain, stat_ptr, and input_file_chain and into a
temporary variable. It then finds the appropriate location in the
respective chains and calls lang_list_insert_after to move the injected
files to the correct location.

If the injected file is an ld script it is not added to the file_chain
linked list. Lang_process does not anticipate this (since presumably all
normally injected files are object files). As such, it tries to move 0
entries from the end of file_chain into the middle of file_chain. That
would be fine, except for a bug in lang_list_remove_tail.

lang_list_remove_tail does not properly handle the case destlist ==
origlist (where no entries should end up stored in the original list);
origlist->head is correctly set to NULL, but origlist->tail remains
pointing at the tail of the original list. It should point at
origlist->head (since the list is empty).

This causes the subsequent call to lang_list_insert_after to create a cycle
in the linked list, which was the cause of the hang I observed.

Suggested patch:
diff --git a/ld/ldlang.c b/ld/ldlang.c
index 53bbff1f2a6..97247e6c691 100644
--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@@ -8123,6 +8123,8 @@ lang_list_remove_tail (lang_statement_list_type
*destlist,
   origlist->tail = destlist->tail;
   destlist->tail = savetail;
   *savetail = NULL;
+  if(origlist->head == NULL)
+    origlist->tail = &origlist->head;
 }

 static lang_statement_union_type **

- Jackson Donaldson

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