BASH PATCH REPORT
=================
Bash-Release: 5.2
Patch-ID: bash52-007
Bug-Reported-by: Bruce Jerrick
Bug-Reference-ID:
Bug-Reference-URL: https://bugzilla.redhat.com/show_bug.cgi?id=2134307
Bug-Description:
This patch fixes several problems with alias expansion inside command
substitutions when in POSIX mode.
Patch (apply with `patch -p0'):
*** /fs1/chet/scratch/bash-5.2.6/parse.y 2022-11-02 10:36:54.000000000
-0400
--- parse.y 2022-10-24 10:53:26.000000000 -0400
***************
*** 3613,3616 ****
--- 3614,3618 ----
#define P_ARRAYSUB 0x0020 /* parsing a [...] array subscript for
assignment */
#define P_DOLBRACE 0x0040 /* parsing a ${...} construct */
+ #define P_ARITH 0x0080 /* parsing a $(( )) arithmetic
expansion */
/* Lexical state while parsing a grouping construct or $(...). */
***************
*** 3911,3914 ****
--- 3914,3920 ----
else if ((flags & (P_ARRAYSUB|P_DOLBRACE)) && (tflags & LEX_WASDOL)
&& (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
goto parse_dollar_word;
+ else if ((flags & P_ARITH) && (tflags & LEX_WASDOL) && ch == '(')
/*)*/
+ /* $() inside $(( ))/$[ ] */
+ goto parse_dollar_word;
#if defined (PROCESS_SUBSTITUTION)
/* XXX - technically this should only be recognized at the start of
***************
*** 3941,3945 ****
nestret = parse_matched_pair (0, '{', '}', &nestlen,
P_FIRSTCLOSE|P_DOLBRACE|rflags);
else if (ch == '[') /* ] */
! nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags);
CHECK_NESTRET_ERROR ();
--- 3947,3951 ----
nestret = parse_matched_pair (0, '{', '}', &nestlen,
P_FIRSTCLOSE|P_DOLBRACE|rflags);
else if (ch == '[') /* ] */
! nestret = parse_matched_pair (0, '[', ']', &nestlen,
rflags|P_ARITH);
CHECK_NESTRET_ERROR ();
***************
*** 4080,4084 ****
shell_ungetc (peekc);
if (peekc == '(') /*)*/
! return (parse_matched_pair (qc, open, close, lenp, 0));
}
--- 4086,4090 ----
shell_ungetc (peekc);
if (peekc == '(') /*)*/
! return (parse_matched_pair (qc, open, close, lenp, P_ARITH));
}
***************
*** 4501,4505 ****
exp_lineno = line_number;
! ttok = parse_matched_pair (0, '(', ')', &ttoklen, 0);
rval = 1;
if (ttok == &matched_pair_error)
--- 4512,4516 ----
exp_lineno = line_number;
! ttok = parse_matched_pair (0, '(', ')', &ttoklen, P_ARITH);
rval = 1;
if (ttok == &matched_pair_error)
***************
*** 5016,5020 ****
}
else
! ttok = parse_matched_pair (cd, '[', ']', &ttoklen, 0);
if (ttok == &matched_pair_error)
return -1; /* Bail immediately. */
--- 5030,5034 ----
}
else
! ttok = parse_matched_pair (cd, '[', ']', &ttoklen, P_ARITH);
if (ttok == &matched_pair_error)
return -1; /* Bail immediately. */
*** ../bash-5.2.6/y.tab.c 2022-11-02 10:36:54.000000000 -0400
--- y.tab.c 2022-11-02 10:55:58.000000000 -0400
***************
*** 5924,5927 ****
--- 5924,5928 ----
#define P_ARRAYSUB 0x0020 /* parsing a [...] array subscript for
assignment */
#define P_DOLBRACE 0x0040 /* parsing a ${...} construct */
+ #define P_ARITH 0x0080 /* parsing a $(( )) arithmetic
expansion */
/* Lexical state while parsing a grouping construct or $(...). */
***************
*** 6222,6225 ****
--- 6223,6229 ----
else if ((flags & (P_ARRAYSUB|P_DOLBRACE)) && (tflags & LEX_WASDOL)
&& (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */
goto parse_dollar_word;
+ else if ((flags & P_ARITH) && (tflags & LEX_WASDOL) && ch == '(')
/*)*/
+ /* $() inside $(( ))/$[ ] */
+ goto parse_dollar_word;
#if defined (PROCESS_SUBSTITUTION)
/* XXX - technically this should only be recognized at the start of
***************
*** 6252,6256 ****
nestret = parse_matched_pair (0, '{', '}', &nestlen,
P_FIRSTCLOSE|P_DOLBRACE|rflags);
else if (ch == '[') /* ] */
! nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags);
CHECK_NESTRET_ERROR ();
--- 6256,6260 ----
nestret = parse_matched_pair (0, '{', '}', &nestlen,
P_FIRSTCLOSE|P_DOLBRACE|rflags);
else if (ch == '[') /* ] */
! nestret = parse_matched_pair (0, '[', ']', &nestlen,
rflags|P_ARITH);
CHECK_NESTRET_ERROR ();
***************
*** 6391,6395 ****
shell_ungetc (peekc);
if (peekc == '(') /*)*/
! return (parse_matched_pair (qc, open, close, lenp, 0));
}
--- 6395,6399 ----
shell_ungetc (peekc);
if (peekc == '(') /*)*/
! return (parse_matched_pair (qc, open, close, lenp, P_ARITH));
}
***************
*** 6812,6816 ****
exp_lineno = line_number;
! ttok = parse_matched_pair (0, '(', ')', &ttoklen, 0);
rval = 1;
if (ttok == &matched_pair_error)
--- 6816,6820 ----
exp_lineno = line_number;
! ttok = parse_matched_pair (0, '(', ')', &ttoklen, P_ARITH);
rval = 1;
if (ttok == &matched_pair_error)
***************
*** 7327,7331 ****
}
else
! ttok = parse_matched_pair (cd, '[', ']', &ttoklen, 0);
if (ttok == &matched_pair_error)
return -1; /* Bail immediately. */
--- 7331,7335 ----
}
else
! ttok = parse_matched_pair (cd, '[', ']', &ttoklen, P_ARITH);
if (ttok == &matched_pair_error)
return -1; /* Bail immediately. */
*** /fs1/chet/scratch/bash-5.2.6/builtins/evalstring.c 2022-07-18
14:46:56.000000000 -0400
--- builtins/evalstring.c 2022-10-18 10:57:51.000000000 -0400
***************
*** 432,435 ****
--- 432,437 ----
if (parse_command () == 0)
{
+ int local_expalias, local_alflag;
+
if ((flags & SEVAL_PARSEONLY) || (interactive_shell == 0 &&
read_but_dont_execute))
{
***************
*** 508,511 ****
--- 510,526 ----
#endif /* ONESHOT */
+ /* We play tricks in the parser and command_substitute() turning
+ expand_aliases on and off depending on which parsing pass and
+ whether or not we're in posix mode. This only matters for
+ parsing, and we let the higher layers deal with that. We just
+ want to ensure that expand_aliases is set to the appropriate
+ global value when we go to execute this command, so we save
+ and restore it around the execution (we don't restore it if
+ the global value of the flag (expaliases_flag) changes). */
+ local_expalias = expand_aliases;
+ local_alflag = expaliases_flag;
+ if (subshell_environment & SUBSHELL_COMSUB)
+ expand_aliases = expaliases_flag;
+
/* See if this is a candidate for $( <file ). */
if (startup_state == 2 &&
***************
*** 525,528 ****
--- 540,547 ----
discard_unwind_frame ("pe_dispose");
+ /* If the global value didn't change, we restore what we had. */
+ if ((subshell_environment & SUBSHELL_COMSUB) && local_alflag ==
expaliases_flag)
+ expand_aliases = local_expalias;
+
if (flags & SEVAL_ONECMD)
{
*** /fs1/chet/scratch/bash-5.2.6/command.h 2021-04-30 15:43:15.000000000
-0400
--- command.h 2022-10-18 11:44:31.000000000 -0400
***************
*** 115,118 ****
--- 115,119 ----
#define PF_EXPANDRHS 0x20 /* same as W_EXPANDRHS */
#define PF_ALLINDS 0x40 /* array, act as if [@] was supplied */
+ #define PF_BACKQUOTE 0x80 /* differentiate `` from $() for
command_substitute */
/* Possible values for subshell_environment */
*** /fs1/chet/scratch/bash-5.2.6/subst.c 2022-11-02 10:28:10.000000000
-0400
--- subst.c 2022-10-20 12:41:07.000000000 -0400
***************
*** 7124,7129 ****
/* We want to expand aliases on this pass if we are not in posix mode
! for backwards compatibility. */
! if (expand_aliases)
expand_aliases = posixly_correct == 0;
--- 7133,7142 ----
/* We want to expand aliases on this pass if we are not in posix mode
! for backwards compatibility. parse_and_execute() takes care of
! setting expand_aliases back to the global value when executing the
! parsed string. We only do this for $(...) command substitution,
! since that is what parse_comsub handles; `` comsubs are processed
! using parse.y:parse_matched_pair(). */
! if (expand_aliases && (flags & PF_BACKQUOTE) == 0)
expand_aliases = posixly_correct == 0;
***************
*** 11293,11297 ****
{
de_backslash (temp);
! tword = command_substitute (temp, quoted, 0);
temp1 = tword ? tword->word : (char *)NULL;
if (tword)
--- 11306,11310 ----
{
de_backslash (temp);
! tword = command_substitute (temp, quoted, PF_BACKQUOTE);
temp1 = tword ? tword->word : (char *)NULL;
if (tword)
*** ../bash-5.2/patchlevel.h 2020-06-22 14:51:03.000000000 -0400
--- patchlevel.h 2020-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 6
#endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 7
#endif /* _PATCHLEVEL_H_ */
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
