Since the changes in [1], there's an issue with CTLNUL leakage in
${param=word} when word has null strings, like:
$ unset v; printf '<%q>' ${v= ''}
<$'\177'>
I think this can be addressed with:
diff --git a/subst.c b/subst.c
index 4962d2f5..58d33996 100644
--- a/subst.c
+++ b/subst.c
@@ -10314,7 +10314,7 @@ add_twochars:
this is when we are going to be performing word splitting,
since we have to preserve a null argument if the next character
will cause word splitting. */
- if (temp == 0 && quoted_state == PARTIALLY_QUOTED && quoted
== 0 && (word->flags & W_NOSPLIT) == 0 && (word->flags & W_EXPANDRHS))
+ if (temp == 0 && quoted_state == PARTIALLY_QUOTED && quoted
== 0 && (word->flags & W_NOSPLIT) == 0 && (word->flags & W_EXPANDRHS)
&& (word->flags & W_ASSIGNRHS) == 0)
{
c = CTLNUL;
sindex--;
@@ -10373,7 +10373,7 @@ add_twochars:
partially quoted; such nulls are discarded. See above for the
exception, which is when the string is going to be split.
Posix interp 888/1129 */
- if (temp == 0 && quoted_state == PARTIALLY_QUOTED && quoted
== 0 && (word->flags & W_NOSPLIT) == 0 && (word->flags & W_EXPANDRHS))
+ if (temp == 0 && quoted_state == PARTIALLY_QUOTED && quoted
== 0 && (word->flags & W_NOSPLIT) == 0 && (word->flags & W_EXPANDRHS)
&& (word->flags & W_ASSIGNRHS) == 0)
{
c = CTLNUL;
sindex--;
[1]:
https://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=9e48f856544da2d2cc95600f487e5b5bcefa0d85
