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hush: fix double-free in "echo TEST &"
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19
shell/README
19
shell/README
@ -1,7 +1,24 @@
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Various bits of what is known about busybox shells, in no particular order.
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2006-05-06
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hush: more bugs spotted. Comparison with bash:
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bash-3.2# echo "TEST`date;echo;echo`BEST"
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TESTSun May 6 09:21:05 CEST 2007BEST [we dont strip eols]
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bash-3.2# echo "TEST`echo '$(echo ZZ)'`BEST"
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TEST$(echo ZZ)BEST [we execute inner echo]
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bash-3.2# echo "TEST`echo "'"`BEST"
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TEST'BEST [we totally mess up this one]
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bash-3.2# echo `sleep 5`
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[Ctrl-C should work, Ctrl-Z should do nothing][we totally mess up this one]
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bash-3.2# if true; then
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> [Ctrl-C]
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bash-3.2# [we re-issue "> "]
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bash-3.2# if echo `sleep 5`; then
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> true; fi [we execute sleep before "> "]
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2007-05-04
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hush: make ctrl-Z/C work correctly for "while true; do true; done"
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hush: made ctrl-Z/C work correctly for "while true; do true; done"
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(namely, it backgrounds/interrupts entire "while")
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2007-05-03
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hush: new bug spotted: Ctrl-C on "while true; do true; done" doesn't
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179
shell/hush.c
179
shell/hush.c
@ -87,34 +87,37 @@
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* to perform debug printfs to stderr: */
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#define debug_printf(...) do {} while (0)
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/* Finer-grained debug switches */
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#define debug_printf_jobs(...) do {} while (0)
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#define debug_printf_exec(...) do {} while (0)
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#define debug_printf_parse(...) do {} while (0)
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#define debug_print_tree(a, b) do {} while (0)
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#define debug_printf_exec(...) do {} while (0)
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#define debug_printf_jobs(...) do {} while (0)
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#define debug_printf_clean(...) do {} while (0)
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#ifndef debug_printf
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#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
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/* broken, of course, but OK for testing */
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static const char *indenter(int i)
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{
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static const char blanks[] = " ";
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return &blanks[sizeof(blanks) - i - 1];
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}
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#endif
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#define final_printf debug_printf
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#ifndef debug_printf_jobs
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#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
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#define DEBUG_SHELL_JOBS 1
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#ifndef debug_printf_parse
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#define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__)
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#endif
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#ifndef debug_printf_exec
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#define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__)
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#endif
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#ifndef debug_printf_parse
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#define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__)
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#ifndef debug_printf_jobs
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#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
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#define DEBUG_SHELL_JOBS 1
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#endif
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#ifndef debug_printf_clean
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/* broken, of course, but OK for testing */
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static const char *indenter(int i)
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{
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static const char blanks[] = " ";
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return &blanks[sizeof(blanks) - i - 1];
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}
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#define debug_printf_clean(...) fprintf(stderr, __VA_ARGS__)
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#endif
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@ -281,7 +284,7 @@ static unsigned last_bg_pid;
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enum { interactive_fd = 0 };
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#else
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/* 'interactive_fd' is a fd# open to ctty, if we have one
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* _AND_ if we decided to mess with job control */
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* _AND_ if we decided to act interactively */
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static int interactive_fd;
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#if ENABLE_HUSH_JOB
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static pid_t saved_task_pgrp;
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@ -379,6 +382,7 @@ static void mark_open(int fd);
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static void mark_closed(int fd);
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static void close_all(void);
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/* "run" the final data structures: */
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//TODO: remove indent argument from non-debug build!
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static int free_pipe_list(struct pipe *head, int indent);
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static int free_pipe(struct pipe *pi, int indent);
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/* really run the final data structures: */
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@ -537,10 +541,6 @@ static void handler_ctrl_z(int sig)
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if (pid < 0) /* can't fork. Pretend there were no ctrl-Z */
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return;
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ctrl_z_flag = 1;
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//vda: wrong!!
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// toplevel_list->running_progs = 1;
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// toplevel_list->stopped_progs = 0;
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//
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if (!pid) { /* child */
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setpgrp();
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debug_printf_jobs("set pgrp for child %d ok\n", getpid());
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@ -555,9 +555,6 @@ static void handler_ctrl_z(int sig)
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/* finish filling up pipe info */
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toplevel_list->pgrp = pid; /* child is in its own pgrp */
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toplevel_list->progs[0].pid = pid;
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//vda: wrong!!
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// toplevel_list->running_progs = 1;
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// toplevel_list->stopped_progs = 0;
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/* parent needs to longjmp out of running nofork.
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* we will "return" exitcode 0, with child put in background */
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// as usual we can have all kinds of nasty problems with leaked malloc data here
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@ -1051,7 +1048,7 @@ static void cmdedit_set_initial_prompt(void)
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PS1 = "\\w \\$ ";
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#endif
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}
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#endif
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#endif /* EDITING */
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static const char* setup_prompt_string(int promptmode)
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{
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@ -1075,13 +1072,11 @@ static const char* setup_prompt_string(int promptmode)
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debug_printf("result %s\n", prompt_str);
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return prompt_str;
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}
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#endif /* ENABLE_HUSH_INTERACTIVE */
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#if ENABLE_FEATURE_EDITING
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static line_input_t *line_input_state;
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#endif
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#if ENABLE_HUSH_INTERACTIVE
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static int get_user_input(struct in_str *i)
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{
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static char the_command[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
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@ -1096,18 +1091,18 @@ static int get_user_input(struct in_str *i)
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** atexit() handlers and other unwanted stuff to our
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** child processes (rob@sysgo.de)
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*/
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r = read_line_input(prompt_str, the_command, BUFSIZ, line_input_state);
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r = read_line_input(prompt_str, the_command, BUFSIZ-1, line_input_state);
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#else
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fputs(prompt_str, stdout);
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fflush(stdout);
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the_command[0] = r = fgetc(i->file);
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the_command[1] = '\0';
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/*the_command[1] = '\0'; - already is and never changed */
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#endif
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fflush(stdout);
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i->p = the_command;
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return r; /* < 0 == EOF. Not meaningful otherwise */
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}
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#endif
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#endif /* INTERACTIVE */
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/* This is the magic location that prints prompts
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* and gets data back from the user */
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@ -1279,7 +1274,7 @@ static void pseudo_exec_argv(char **argv)
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for (i = 0; is_assignment(argv[i]); i++) {
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debug_printf("pid %d environment modification: %s\n",
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getpid(), argv[i]);
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// FIXME: vfork case??
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// FIXME: vfork case??
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p = insert_var_value(argv[i]);
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putenv(strdup(p));
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if (p != argv[i])
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@ -1342,6 +1337,7 @@ static void pseudo_exec(struct child_prog *child)
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if (child->group) {
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// FIXME: do not modify globals! Think vfork!
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#if ENABLE_HUSH_INTERACTIVE
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debug_printf_exec("pseudo_exec: setting interactive_fd=0\n");
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interactive_fd = 0; /* crucial!!!! */
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#endif
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debug_printf_exec("pseudo_exec: run_list_real\n");
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@ -1365,7 +1361,7 @@ static const char *get_cmdtext(struct pipe *pi)
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/* This is subtle. ->cmdtext is created only on first backgrounding.
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* (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
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* On subsequent bg argv can be trashed, but we won't use it */
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* On subsequent bg argv is trashed, but we won't use it */
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if (pi->cmdtext)
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return pi->cmdtext;
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argv = pi->progs[0].argv;
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@ -1385,12 +1381,11 @@ static const char *get_cmdtext(struct pipe *pi)
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p[-1] = '\0';
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return pi->cmdtext;
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}
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#endif
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#if ENABLE_HUSH_JOB
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static void insert_bg_job(struct pipe *pi)
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{
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struct pipe *thejob;
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int i;
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/* Linear search for the ID of the job to use */
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pi->jobid = 1;
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@ -1398,7 +1393,7 @@ static void insert_bg_job(struct pipe *pi)
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if (thejob->jobid >= pi->jobid)
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pi->jobid = thejob->jobid + 1;
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/* add thejob to the list of running jobs */
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/* Add thejob to the list of running jobs */
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if (!job_list) {
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thejob = job_list = xmalloc(sizeof(*thejob));
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} else {
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@ -1408,17 +1403,29 @@ static void insert_bg_job(struct pipe *pi)
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thejob = thejob->next;
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}
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/* physically copy the struct job */
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/* Physically copy the struct job */
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memcpy(thejob, pi, sizeof(struct pipe));
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thejob->progs = xmalloc(sizeof(pi->progs[0]) * pi->num_progs);
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memcpy(thejob->progs, pi->progs, sizeof(pi->progs[0]) * pi->num_progs);
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thejob->progs = xzalloc(sizeof(pi->progs[0]) * pi->num_progs);
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/* We cannot copy entire pi->progs[] vector! Double free()s will happen */
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for (i = 0; i < pi->num_progs; i++) {
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// TODO: do we really need to have so many fields which are just dead weight
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// at execution stage?
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thejob->progs[i].pid = pi->progs[i].pid;
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//rest:
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//char **argv; /* program name and arguments */
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//struct pipe *group; /* if non-NULL, first in group or subshell */
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//int subshell; /* flag, non-zero if group must be forked */
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//struct redir_struct *redirects; /* I/O redirections */
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//glob_t glob_result; /* result of parameter globbing */
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//int is_stopped; /* is the program currently running? */
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//struct pipe *family; /* pointer back to the child's parent pipe */
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//int sp; /* number of SPECIAL_VAR_SYMBOL */
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//int type;
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}
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thejob->next = NULL;
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/*seems to be wrong:*/
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/*thejob->running_progs = thejob->num_progs;*/
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/*thejob->stopped_progs = 0;*/
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thejob->cmdtext = xstrdup(get_cmdtext(pi));
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/* we don't wait for background thejobs to return -- append it
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/* We don't wait for background thejobs to return -- append it
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to the list of backgrounded thejobs and leave it alone */
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printf("[%d] %d %s\n", thejob->jobid, thejob->progs[0].pid, thejob->cmdtext);
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last_bg_pid = thejob->progs[0].pid;
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@ -1451,7 +1458,7 @@ static void delete_finished_bg_job(struct pipe *pi)
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free_pipe(pi, 0);
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free(pi);
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}
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#endif
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#endif /* JOB */
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/* Checks to see if any processes have exited -- if they
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have, figure out why and see if a job has completed */
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@ -1622,7 +1629,7 @@ static int run_pipe_real(struct pipe *pi)
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int rcode;
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const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
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debug_printf_exec("run_pipe_real start:\n");
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debug_printf_exec("run_pipe_real start: single_fg=%d\n", single_fg);
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nextin = 0;
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#if ENABLE_HUSH_JOB
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@ -1724,7 +1731,7 @@ static int run_pipe_real(struct pipe *pi)
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setup_redirects(child, squirrel);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv[i], argv[i+1]);
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save_nofork_data(&nofork_save);
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rcode = run_nofork_applet_prime(&nofork_save, a, argv);
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rcode = run_nofork_applet_prime(&nofork_save, a, argv + i);
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restore_redirects(squirrel);
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debug_printf_exec("run_pipe_real return %d\n", rcode);
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return rcode;
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@ -1742,7 +1749,10 @@ static int run_pipe_real(struct pipe *pi)
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for (i = 0; i < pi->num_progs; i++) {
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child = &(pi->progs[i]);
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if (child->argv)
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debug_printf_exec(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
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else
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debug_printf_exec(": pipe member with no argv\n");
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/* pipes are inserted between pairs of commands */
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if ((i + 1) < pi->num_progs) {
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@ -1833,8 +1843,8 @@ static void debug_print_tree(struct pipe *pi, int lvl)
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static const char *PIPE[] = {
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[PIPE_SEQ] = "SEQ",
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[PIPE_AND] = "AND",
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[PIPE_OR ] = "OR",
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[PIPE_BG ] = "BG",
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[PIPE_OR ] = "OR" ,
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[PIPE_BG ] = "BG" ,
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};
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static const char *RES[] = {
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[RES_NONE ] = "NONE" ,
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@ -1914,14 +1924,15 @@ static int run_list_real(struct pipe *pi)
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if ((rpipe->r_mode == RES_IN || rpipe->r_mode == RES_FOR)
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&& (rpipe->next == NULL)
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) {
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syntax();
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syntax(); /* unterminated FOR (no IN or no commands after IN) */
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debug_printf_exec("run_list_real lvl %d return 1\n", level);
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return 1;
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}
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if ((rpipe->r_mode == RES_IN && rpipe->next->r_mode == RES_IN && rpipe->next->progs->argv != NULL)
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if ((rpipe->r_mode == RES_IN && rpipe->next->r_mode == RES_IN && rpipe->next->progs[0].argv != NULL)
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|| (rpipe->r_mode == RES_FOR && rpipe->next->r_mode != RES_IN)
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) {
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syntax();
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/* TODO: what is tested in the first condition? */
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syntax(); /* 2nd: malformed FOR (not followed by IN) */
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debug_printf_exec("run_list_real lvl %d return 1\n", level);
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return 1;
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}
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@ -1952,7 +1963,7 @@ static int run_list_real(struct pipe *pi)
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* Remember this child as background job */
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insert_bg_job(pi);
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} else {
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/* ctrl-C. We just stop doing whatever we was doing */
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/* ctrl-C. We just stop doing whatever we were doing */
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putchar('\n');
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}
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rcode = 0;
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@ -2018,7 +2029,6 @@ static int run_list_real(struct pipe *pi)
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continue;
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}
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/* insert new value from list for variable */
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if (pi->progs->argv[0])
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free(pi->progs->argv[0]);
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pi->progs->argv[0] = *list++;
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pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
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@ -2045,16 +2055,21 @@ static int run_list_real(struct pipe *pi)
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/* We only ran a builtin: rcode was set by the return value
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* of run_pipe_real(), and we don't need to wait for anything. */
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} else if (pi->followup == PIPE_BG) {
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/* XXX check bash's behavior with nontrivial pipes */
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/* XXX compute jobid */
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/* XXX what does bash do with attempts to background builtins? */
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/* What does bash do with attempts to background builtins? */
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/* Even bash 3.2 doesn't do that well with nested bg:
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* try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
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* I'm considering NOT treating inner bgs as jobs -
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* thus maybe "if (level == 1 && pi->followup == PIPE_BG)"
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* above? */
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#if ENABLE_HUSH_JOB
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insert_bg_job(pi);
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#endif
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rcode = EXIT_SUCCESS;
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} else {
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#if ENABLE_HUSH_JOB
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if (interactive_fd) {
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/* Paranoia, just "interactive_fd" should be enough */
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if (level == 1 && interactive_fd) {
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rcode = checkjobs_and_fg_shell(pi);
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} else
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#endif
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@ -2103,33 +2118,33 @@ static int free_pipe(struct pipe *pi, int indent)
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if (pi->stopped_progs > 0)
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return ret_code;
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final_printf("%s run pipe: (pid %d)\n", indenter(indent), getpid());
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debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
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for (i = 0; i < pi->num_progs; i++) {
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child = &pi->progs[i];
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final_printf("%s command %d:\n", indenter(indent), i);
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debug_printf_clean("%s command %d:\n", indenter(indent), i);
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if (child->argv) {
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for (a = 0, p = child->argv; *p; a++, p++) {
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final_printf("%s argv[%d] = %s\n", indenter(indent), a, *p);
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debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
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}
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globfree(&child->glob_result);
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child->argv = NULL;
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} else if (child->group) {
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final_printf("%s begin group (subshell:%d)\n", indenter(indent), child->subshell);
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debug_printf_clean("%s begin group (subshell:%d)\n", indenter(indent), child->subshell);
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ret_code = free_pipe_list(child->group, indent+3);
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final_printf("%s end group\n", indenter(indent));
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debug_printf_clean("%s end group\n", indenter(indent));
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} else {
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final_printf("%s (nil)\n", indenter(indent));
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debug_printf_clean("%s (nil)\n", indenter(indent));
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}
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for (r = child->redirects; r; r = rnext) {
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final_printf("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
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debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
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if (r->dup == -1) {
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/* guard against the case >$FOO, where foo is unset or blank */
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if (r->word.gl_pathv) {
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||||
final_printf(" %s\n", *r->word.gl_pathv);
|
||||
debug_printf_clean(" %s\n", *r->word.gl_pathv);
|
||||
globfree(&r->word);
|
||||
}
|
||||
} else {
|
||||
final_printf("&%d\n", r->dup);
|
||||
debug_printf_clean("&%d\n", r->dup);
|
||||
}
|
||||
rnext = r->next;
|
||||
free(r);
|
||||
@ -2149,10 +2164,11 @@ static int free_pipe_list(struct pipe *head, int indent)
|
||||
{
|
||||
int rcode = 0; /* if list has no members */
|
||||
struct pipe *pi, *next;
|
||||
|
||||
for (pi = head; pi; pi = next) {
|
||||
final_printf("%s pipe reserved mode %d\n", indenter(indent), pi->r_mode);
|
||||
debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->r_mode);
|
||||
rcode = free_pipe(pi, indent);
|
||||
final_printf("%s pipe followup code %d\n", indenter(indent), pi->followup);
|
||||
debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
|
||||
next = pi->next;
|
||||
/*pi->next = NULL;*/
|
||||
free(pi);
|
||||
@ -2164,14 +2180,16 @@ static int free_pipe_list(struct pipe *head, int indent)
|
||||
static int run_list(struct pipe *pi)
|
||||
{
|
||||
int rcode = 0;
|
||||
debug_printf_exec("run_list entered\n");
|
||||
if (fake_mode == 0) {
|
||||
debug_printf_exec("run_list: run_list_real with %d members\n", pi->num_progs);
|
||||
debug_printf_exec(": run_list_real with %d members\n", pi->num_progs);
|
||||
rcode = run_list_real(pi);
|
||||
}
|
||||
/* free_pipe_list has the side effect of clearing memory
|
||||
/* free_pipe_list has the side effect of clearing memory.
|
||||
* In the long run that function can be merged with run_list_real,
|
||||
* but doing that now would hobble the debugging effort. */
|
||||
free_pipe_list(pi, 0);
|
||||
debug_printf_exec("run_list return %d\n", rcode);
|
||||
return rcode;
|
||||
}
|
||||
|
||||
@ -2201,7 +2219,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
|
||||
pglob->gl_offs = 0;
|
||||
}
|
||||
pathc = ++pglob->gl_pathc;
|
||||
pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
|
||||
pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1) * sizeof(*pglob->gl_pathv));
|
||||
if (pglob->gl_pathv == NULL)
|
||||
return GLOB_NOSPACE;
|
||||
pglob->gl_pathv[pathc-1] = dest;
|
||||
@ -2821,8 +2839,7 @@ static FILE *generate_stream_from_list(struct pipe *head)
|
||||
return pf;
|
||||
}
|
||||
|
||||
/* this version hacked for testing purposes */
|
||||
/* return code is exit status of the process that is run. */
|
||||
/* Return code is exit status of the process that is run. */
|
||||
static int process_command_subs(o_string *dest, struct p_context *ctx,
|
||||
struct in_str *input, const char *subst_end)
|
||||
{
|
||||
@ -2843,9 +2860,19 @@ static int process_command_subs(o_string *dest, struct p_context *ctx,
|
||||
p = generate_stream_from_list(inner.list_head);
|
||||
if (p == NULL) return 1;
|
||||
mark_open(fileno(p));
|
||||
// FIXME: need to flag pipe_str to somehow discard all trailing newlines.
|
||||
// Example: echo "TEST`date;echo;echo`BEST"
|
||||
// must produce one line: TEST<date>BEST
|
||||
setup_file_in_str(&pipe_str, p);
|
||||
|
||||
/* now send results of command back into original context */
|
||||
// FIXME: must not do quote parsing of the output!
|
||||
// Example: echo "TEST`echo '$(echo ZZ)'`BEST"
|
||||
// must produce TEST$(echo ZZ)BEST, not TESTZZBEST.
|
||||
// Example: echo "TEST`echo "'"`BEST"
|
||||
// must produce TEST'BEST
|
||||
// (maybe by setting all chars flagged as literals in map[]?)
|
||||
|
||||
retcode = parse_stream(dest, ctx, &pipe_str, NULL);
|
||||
/* XXX In case of a syntax error, should we try to kill the child?
|
||||
* That would be tough to do right, so just read until EOF. */
|
||||
@ -2864,7 +2891,6 @@ static int process_command_subs(o_string *dest, struct p_context *ctx,
|
||||
retcode = pclose(p);
|
||||
free_pipe_list(inner.list_head, 0);
|
||||
debug_printf("pclosed, retcode=%d\n", retcode);
|
||||
/* XXX this process fails to trim a single trailing newline */
|
||||
return retcode;
|
||||
}
|
||||
|
||||
@ -2904,7 +2930,7 @@ static int parse_group(o_string *dest, struct p_context *ctx,
|
||||
/* child remains "open", available for possible redirects */
|
||||
}
|
||||
|
||||
/* basically useful version until someone wants to get fancier,
|
||||
/* Basically useful version until someone wants to get fancier,
|
||||
* see the bash man page under "Parameter Expansion" */
|
||||
static const char *lookup_param(const char *src)
|
||||
{
|
||||
@ -3272,8 +3298,8 @@ static int parse_stream_outer(struct in_str *inp, int parse_flag)
|
||||
if (rcode != 1 && ctx.old_flag == 0) {
|
||||
done_word(&temp, &ctx);
|
||||
done_pipe(&ctx, PIPE_SEQ);
|
||||
debug_printf_exec("parse_stream_outer: run_list\n");
|
||||
debug_print_tree(ctx.list_head, 0);
|
||||
debug_printf_exec("parse_stream_outer: run_list\n");
|
||||
run_list(ctx.list_head);
|
||||
} else {
|
||||
if (ctx.old_flag != 0) {
|
||||
@ -3392,7 +3418,7 @@ int hush_main(int argc, char **argv)
|
||||
last_return_code = EXIT_SUCCESS;
|
||||
|
||||
if (argv[0] && argv[0][0] == '-') {
|
||||
debug_printf("\nsourcing /etc/profile\n");
|
||||
debug_printf("sourcing /etc/profile\n");
|
||||
input = fopen("/etc/profile", "r");
|
||||
if (input != NULL) {
|
||||
mark_open(fileno(input));
|
||||
@ -3455,12 +3481,13 @@ int hush_main(int argc, char **argv)
|
||||
// to (inadvertently) close/redirect it
|
||||
}
|
||||
}
|
||||
debug_printf("\ninteractive_fd=%d\n", interactive_fd);
|
||||
debug_printf("interactive_fd=%d\n", interactive_fd);
|
||||
if (interactive_fd) {
|
||||
/* Looks like they want an interactive shell */
|
||||
setup_job_control();
|
||||
/* Make xfuncs do cleanup on exit */
|
||||
die_sleep = -1; /* flag */
|
||||
// FIXME: should we reset die_sleep = 0 whereever we fork?
|
||||
if (setjmp(die_jmp)) {
|
||||
/* xfunc has failed! die die die */
|
||||
hush_exit(xfunc_error_retval);
|
||||
|
Loading…
Reference in New Issue
Block a user