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+ BASH PATCH REPORT
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+ =================
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+
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+Bash-Release: 4.3
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+Patch-ID: bash43-033
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+
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+Bug-Reported-by: mickael9@gmail.com, Jan Rome <jan.rome@gmail.com>
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+Bug-Reference-ID: <20140907224046.382ED3610CC@mickael-laptop.localdomain>,
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+ <540D661D.50908@gmail.com>
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+Bug-Reference-URL: http://lists.gnu.org/archive/html/bug-bash/2014-09/msg00029.html
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+ http://lists.gnu.org/archive/html/bug-bash/2014-09/msg00030.html
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+
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+Bug-Description:
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+
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+Bash does not clean up the terminal state in all cases where bash or
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+readline modifies it and bash is subsequently terminated by a fatal signal.
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+This happens when the `read' builtin modifies the terminal settings, both
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+when readline is active and when it is not. It occurs most often when a script
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+installs a trap that exits on a signal without re-sending the signal to itself.
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+
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+Patch (apply with `patch -p0'):
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+
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+--- a/shell.c
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++++ b/shell.c
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+@@ -73,6 +73,7 @@
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+ #endif
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+
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+ #if defined (READLINE)
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++# include <readline/readline.h>
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+ # include "bashline.h"
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+ #endif
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+
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+@@ -909,6 +910,14 @@ exit_shell (s)
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+ fflush (stdout); /* XXX */
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+ fflush (stderr);
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+
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++ /* Clean up the terminal if we are in a state where it's been modified. */
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++#if defined (READLINE)
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++ if (RL_ISSTATE (RL_STATE_TERMPREPPED) && rl_deprep_term_function)
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++ (*rl_deprep_term_function) ();
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++#endif
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++ if (read_tty_modified ())
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++ read_tty_cleanup ();
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++
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+ /* Do trap[0] if defined. Allow it to override the exit status
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+ passed to us. */
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+ if (signal_is_trapped (0))
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+--- a/builtins/read.def
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++++ b/builtins/read.def
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+@@ -140,10 +140,12 @@ static void reset_alarm __P((void));
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+ procenv_t alrmbuf;
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+ int sigalrm_seen;
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+
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+-static int reading;
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++static int reading, tty_modified;
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+ static SigHandler *old_alrm;
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+ static unsigned char delim;
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+
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++static struct ttsave termsave;
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++
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+ /* In all cases, SIGALRM just sets a flag that we check periodically. This
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+ avoids problems with the semi-tricky stuff we do with the xfree of
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+ input_string at the top of the unwind-protect list (see below). */
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+@@ -188,7 +190,6 @@ read_builtin (list)
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+ struct stat tsb;
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+ SHELL_VAR *var;
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+ TTYSTRUCT ttattrs, ttset;
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+- struct ttsave termsave;
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+ #if defined (ARRAY_VARS)
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+ WORD_LIST *alist;
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+ #endif
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+@@ -221,7 +222,7 @@ read_builtin (list)
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+ USE_VAR(ps2);
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+ USE_VAR(lastsig);
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+
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+- sigalrm_seen = reading = 0;
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++ sigalrm_seen = reading = tty_modified = 0;
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+
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+ i = 0; /* Index into the string that we are reading. */
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+ raw = edit = 0; /* Not reading raw input by default. */
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+@@ -438,6 +439,8 @@ read_builtin (list)
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+ retval = 128+SIGALRM;
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+ goto assign_vars;
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+ }
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++ if (interactive_shell == 0)
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++ initialize_terminating_signals ();
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+ old_alrm = set_signal_handler (SIGALRM, sigalrm);
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+ add_unwind_protect (reset_alarm, (char *)NULL);
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+ #if defined (READLINE)
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+@@ -482,7 +485,10 @@ read_builtin (list)
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+ i = silent ? ttfd_cbreak (fd, &ttset) : ttfd_onechar (fd, &ttset);
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+ if (i < 0)
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+ sh_ttyerror (1);
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++ tty_modified = 1;
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+ add_unwind_protect ((Function *)ttyrestore, (char *)&termsave);
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++ if (interactive_shell == 0)
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++ initialize_terminating_signals ();
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+ }
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+ }
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+ else if (silent) /* turn off echo but leave term in canonical mode */
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+@@ -497,7 +503,10 @@ read_builtin (list)
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+ if (i < 0)
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+ sh_ttyerror (1);
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+
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++ tty_modified = 1;
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+ add_unwind_protect ((Function *)ttyrestore, (char *)&termsave);
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++ if (interactive_shell == 0)
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++ initialize_terminating_signals ();
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+ }
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+
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+ /* This *must* be the top unwind-protect on the stack, so the manipulation
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+@@ -588,6 +597,8 @@ read_builtin (list)
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+ }
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+ else
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+ lastsig = 0;
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++ if (terminating_signal && tty_modified)
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++ ttyrestore (&termsave); /* fix terminal before exiting */
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+ CHECK_TERMSIG;
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+ eof = 1;
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+ break;
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+@@ -978,6 +989,20 @@ ttyrestore (ttp)
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+ struct ttsave *ttp;
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+ {
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+ ttsetattr (ttp->fd, ttp->attrs);
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++ tty_modified = 0;
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++}
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++
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++void
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++read_tty_cleanup ()
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++{
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++ if (tty_modified)
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++ ttyrestore (&termsave);
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++}
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++
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++int
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++read_tty_modified ()
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++{
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++ return (tty_modified);
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+ }
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+
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+ #if defined (READLINE)
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+--- a/builtins/common.h
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++++ b/builtins/common.h
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+@@ -122,6 +122,10 @@ extern void bash_logout __P((void));
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+ /* Functions from getopts.def */
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+ extern void getopts_reset __P((int));
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+
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++/* Functions from read.def */
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++extern void read_tty_cleanup __P((void));
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++extern int read_tty_modified __P((void));
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++
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+ /* Functions from set.def */
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+ extern int minus_o_option_value __P((char *));
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+ extern void list_minus_o_opts __P((int, int));
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+--- a/bashline.c
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++++ b/bashline.c
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+@@ -202,6 +202,7 @@ extern int current_command_line_count, s
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+ extern int last_command_exit_value;
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+ extern int array_needs_making;
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+ extern int posixly_correct, no_symbolic_links;
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++extern int sigalrm_seen;
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+ extern char *current_prompt_string, *ps1_prompt;
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+ extern STRING_INT_ALIST word_token_alist[];
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+ extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
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+@@ -4208,8 +4209,9 @@ bash_event_hook ()
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+ {
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+ /* If we're going to longjmp to top_level, make sure we clean up readline.
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+ check_signals will call QUIT, which will eventually longjmp to top_level,
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+- calling run_interrupt_trap along the way. */
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+- if (interrupt_state)
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++ calling run_interrupt_trap along the way. The check for sigalrm_seen is
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++ to clean up the read builtin's state. */
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++ if (terminating_signal || interrupt_state || sigalrm_seen)
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+ rl_cleanup_after_signal ();
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+ bashline_reset_event_hook ();
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+ check_signals_and_traps (); /* XXX */
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+--- a/sig.c
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++++ b/sig.c
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+@@ -532,8 +532,10 @@ termsig_sighandler (sig)
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+ #if defined (READLINE)
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+ /* Set the event hook so readline will call it after the signal handlers
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+ finish executing, so if this interrupted character input we can get
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+- quick response. */
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+- if (interactive_shell && interactive && no_line_editing == 0)
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++ quick response. If readline is active or has modified the terminal we
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++ need to set this no matter what the signal is, though the check for
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++ RL_STATE_TERMPREPPED is possibly redundant. */
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++ if (RL_ISSTATE (RL_STATE_SIGHANDLER) || RL_ISSTATE (RL_STATE_TERMPREPPED))
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+ bashline_set_event_hook ();
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+ #endif
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+
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+--- a/patchlevel.h
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++++ b/patchlevel.h
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+@@ -25,6 +25,6 @@
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+ regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
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+ looks for to find the patch level (for the sccs version string). */
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+
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+-#define PATCHLEVEL 32
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++#define PATCHLEVEL 33
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+
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+ #endif /* _PATCHLEVEL_H_ */
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Marcel Denia
9 년 전