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BASH PATCH REPORT
=================
Bash-Release: 5.2
Patch-ID: bash52-004
Bug-Reported-by: Antoine <bug-bash@glitchimini.net>
Bug-Reference-ID: <8bd59753-05ff-9b09-2337-2c7f52ded650@glitchimini.net>
Bug-Reference-URL: https://lists.gnu.org/archive/html/bug-bash/2022-10/msg00022.html
Bug-Description:
Bash needs to keep better track of nested brace expansions to avoid problems
with quoting and POSIX semantics.
Patch (apply with `patch -p0'):
*** ../bash-5.2-patched/subst.c 2022-10-05 10:22:02.000000000 -0400
--- subst.c 2022-10-06 15:19:08.000000000 -0400
***************
*** 1799,1802 ****
--- 1804,1810 ----
}
+ #define PARAMEXPNEST_MAX 32 // for now
+ static int dbstate[PARAMEXPNEST_MAX];
+
/* Extract a parameter expansion expression within ${ and } from STRING.
Obey the Posix.2 rules for finding the ending `}': count braces while
***************
*** 1829,1832 ****
--- 1837,1842 ----
return (extract_heredoc_dolbrace_string (string, sindex, quoted, flags));
+ dbstate[0] = dolbrace_state;
+
pass_character = 0;
nesting_level = 1;
***************
*** 1853,1856 ****
--- 1863,1868 ----
if (string[i] == '$' && string[i+1] == LBRACE)
{
+ if (nesting_level < PARAMEXPNEST_MAX)
+ dbstate[nesting_level] = dolbrace_state;
nesting_level++;
i += 2;
***************
*** 1865,1868 ****
--- 1877,1881 ----
if (nesting_level == 0)
break;
+ dolbrace_state = (nesting_level < PARAMEXPNEST_MAX) ? dbstate[nesting_level] : dbstate[0]; /* Guess using initial state */
i++;
continue;
*** ../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 3
#endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 4
#endif /* _PATCHLEVEL_H_ */
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