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107 lines
3 KiB
Text
107 lines
3 KiB
Text
BASH PATCH REPORT
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=================
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Bash-Release: 4.4
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Patch-ID: bash44-009
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Bug-Reported-by: Hong Cho <hong.cho@citrix.com>
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Bug-Reference-ID: <c30b5fe62b2543af8297e47ca487c29c@SJCPEX02CL02.citrite.net>
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Bug-Reference-URL: http://lists.gnu.org/archive/html/bug-bash/2016-12/msg00043.html
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Bug-Description:
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There is a race condition in add_history() that can be triggered by a fatal
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signal arriving between the time the history length is updated and the time
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the history list update is completed. A later attempt to reference an
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invalid history entry can cause a crash.
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Patch (apply with `patch -p0'):
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*** ../bash-4.4-patched/lib/readline/history.c 2016-11-11 13:42:49.000000000 -0500
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--- lib/readline/history.c 2016-12-05 10:37:51.000000000 -0500
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***************
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*** 280,283 ****
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--- 280,284 ----
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{
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HIST_ENTRY *temp;
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+ int new_length;
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if (history_stifled && (history_length == history_max_entries))
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***************
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*** 296,306 ****
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/* Copy the rest of the entries, moving down one slot. Copy includes
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trailing NULL. */
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- #if 0
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- for (i = 0; i < history_length; i++)
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- the_history[i] = the_history[i + 1];
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- #else
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memmove (the_history, the_history + 1, history_length * sizeof (HIST_ENTRY *));
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- #endif
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history_base++;
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}
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--- 297,303 ----
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/* Copy the rest of the entries, moving down one slot. Copy includes
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trailing NULL. */
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memmove (the_history, the_history + 1, history_length * sizeof (HIST_ENTRY *));
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+ new_length = history_length;
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history_base++;
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}
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***************
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*** 316,320 ****
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history_size = DEFAULT_HISTORY_INITIAL_SIZE;
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the_history = (HIST_ENTRY **)xmalloc (history_size * sizeof (HIST_ENTRY *));
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! history_length = 1;
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}
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else
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--- 313,317 ----
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history_size = DEFAULT_HISTORY_INITIAL_SIZE;
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the_history = (HIST_ENTRY **)xmalloc (history_size * sizeof (HIST_ENTRY *));
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! new_length = 1;
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}
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else
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***************
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*** 326,330 ****
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xrealloc (the_history, history_size * sizeof (HIST_ENTRY *));
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}
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! history_length++;
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}
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}
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--- 323,327 ----
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xrealloc (the_history, history_size * sizeof (HIST_ENTRY *));
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}
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! new_length = history_length + 1;
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}
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}
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***************
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*** 332,337 ****
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temp = alloc_history_entry ((char *)string, hist_inittime ());
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! the_history[history_length] = (HIST_ENTRY *)NULL;
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! the_history[history_length - 1] = temp;
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}
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--- 329,335 ----
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temp = alloc_history_entry ((char *)string, hist_inittime ());
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! the_history[new_length] = (HIST_ENTRY *)NULL;
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! the_history[new_length - 1] = temp;
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! history_length = new_length;
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}
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*** ../bash-4.4/patchlevel.h 2016-06-22 14:51:03.000000000 -0400
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--- patchlevel.h 2016-10-01 11:01:28.000000000 -0400
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***************
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*** 26,30 ****
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looks for to find the patch level (for the sccs version string). */
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! #define PATCHLEVEL 8
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#endif /* _PATCHLEVEL_H_ */
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--- 26,30 ----
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looks for to find the patch level (for the sccs version string). */
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! #define PATCHLEVEL 9
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#endif /* _PATCHLEVEL_H_ */
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