BASH PATCH REPORT
=================
Bash-Release: 4.2
Patch-ID: bash42-043
Bug-Reported-by: konsolebox <
[email protected]>
Bug-Reference-ID: <CAJnmqwZuGKLgMsMwxRK4LL+2NN+HgvmKzrnode99QBGrcgX1Lw@mail.gmail.com>
Bug-Reference-URL:
http://lists.gnu.org/archive/html/bug-bash/2013-01/msg00138.html
Bug-Description:
When SIGCHLD is trapped, and a SIGCHLD trap handler runs when a pending
`read -t' invocation times out and generates SIGALRM, bash can crash with
a segmentation fault.
Patch (apply with `patch -p0'):
*** ../bash-4.2-patched/builtins/read.def 2012-10-31 21:22:51.000517000 -0400
--- builtins/read.def 2013-01-25 10:28:16.000038000 -0500
***************
*** 386,393 ****
/* Tricky. The top of the unwind-protect stack is the free of
input_string. We want to run all the rest and use input_string,
! so we have to remove it from the stack. */
! remove_unwind_protect ();
! run_unwind_frame ("read_builtin");
input_string[i] = '\0'; /* make sure it's terminated */
retval = 128+SIGALRM;
goto assign_vars;
--- 386,403 ----
/* Tricky. The top of the unwind-protect stack is the free of
input_string. We want to run all the rest and use input_string,
! so we have to save input_string temporarily, run the unwind-
! protects, then restore input_string so we can use it later. */
!
input_string[i] = '\0'; /* make sure it's terminated */
+ if (i == 0)
+ {
+ t = (char *)xmalloc (1);
+ t[0] = 0;
+ }
+ else
+ t = savestring (input_string);
+
+ run_unwind_frame ("read_builtin");
+ input_string = t;
retval = 128+SIGALRM;
goto assign_vars;
*** ../bash-4.2-patched/patchlevel.h Sat Jun 12 20:14:48 2010
--- patchlevel.h Thu Feb 24 21:41:34 2011
***************
*** 26,30 ****
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 42
#endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 43
#endif /* _PATCHLEVEL_H_ */
