BASH PATCH REPORT
=================
Bash-Release: 5.3
Patch-ID: bash53-012
Bug-Reported-by: [email protected]
Bug-Reference-ID:
Bug-Reference-URL: https://savannah.gnu.org/bugs/?67745
Bug-Description:
If a subshell with an inherited EXIT trap receives a fatal signal before
it clears the exit trap, and before it restores its original signal
handlers, it's possible for it to inappropriately run the inherited EXIT
trap.
Patch (apply with `patch -p0'):
*** ../bash-5.3-patched/execute_cmd.c Thu Jun 5 11:02:01 2025
--- execute_cmd.c Fri Jan 9 10:21:30 2026
***************
*** 1644,1648 ****
if (user_subshell)
{
! subshell_environment = SUBSHELL_PAREN; /* XXX */
if (asynchronous)
subshell_environment |= SUBSHELL_ASYNC;
--- 1681,1685 ----
if (user_subshell)
{
! subshell_environment = SUBSHELL_PAREN|SUBSHELL_IGNTRAP; /* XXX */
if (asynchronous)
subshell_environment |= SUBSHELL_ASYNC;
***************
*** 1650,1654 ****
else
{
! subshell_environment = 0; /* XXX */
if (asynchronous)
subshell_environment |= SUBSHELL_ASYNC;
--- 1687,1691 ----
else
{
! subshell_environment = SUBSHELL_IGNTRAP; /* XXX
*/
if (asynchronous)
subshell_environment |= SUBSHELL_ASYNC;
*** ../bash-5.3-patched/sig.c Wed Dec 18 15:52:06 2024
--- sig.c Fri Jan 9 10:21:43 2026
***************
*** 639,643 ****
comsub_ignore_return = return_catch_flag = wait_intr_flag = 0;
! run_exit_trap (); /* XXX - run exit trap possibly in signal context? */
kill_shell (sig);
--- 645,652 ----
comsub_ignore_return = return_catch_flag = wait_intr_flag = 0;
! /* Don't run the exit trap if we're supposed to be ignoring traps in a
! subshell environment. */
! if ((subshell_environment & SUBSHELL_IGNTRAP) == 0)
! run_exit_trap (); /* XXX - run exit trap possibly in signal context? */
kill_shell (sig);
*** ../bash-5.3/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 11
#endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 12
#endif /* _PATCHLEVEL_H_ */
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU [email protected] http://tiswww.cwru.edu/~chet/
