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https://github.com/sheumann/hush.git
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hush: fix NOMMU hangs in pseudo_exec_argv. Add forgotted setting
of signal mask. Reuse same help string in all shells. function old new delta builtin_exit 49 47 -2 pseudo_exec_argv 149 145 -4 builtin_help 74 63 -11 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-17) Total: -17 bytes text data bss dec hex filename 825379 476 7616 833471 cb7bf busybox_old 825341 476 7616 833433 cb799 busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
552433bc5a
commit
34d4d89b2d
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@ -12230,7 +12230,9 @@ helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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unsigned col;
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unsigned i;
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out1fmt("\nBuilt-in commands:\n-------------------\n");
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out1fmt("\n"
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"Built-in commands:\n"
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"------------------\n");
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for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
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col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
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builtintab[i].name + 1);
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122
shell/hush.c
122
shell/hush.c
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@ -363,11 +363,13 @@ struct parse_context {
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/* bitmask of FLAG_xxx, for figuring out valid reserved words */
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int old_flag;
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/* group we are enclosed in:
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* example 1: "{ { false; ..."
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* example 2: "if true; then { false; ..."
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* example 3: "if true; then if false; ..."
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* when we find closing "}" / "fi" / whatever, we move list_head
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* into stack->command->group and delete ourself.
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* example: "if pipe1; pipe2; then pipe3; fi"
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* when we see "if" or "then", we malloc and copy current context,
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* and make ->stack point to it. then we parse pipeN.
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* when closing "then" / fi" / whatever is found,
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* we move list_head into ->stack->command->group,
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* copy ->stack into current context, and delete ->stack.
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* (parsing of { list } and ( list ) doesn't use this method)
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*/
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struct parse_context *stack;
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#endif
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@ -532,7 +534,6 @@ static int builtin_wait(char **argv);
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static int builtin_break(char **argv);
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static int builtin_continue(char **argv);
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#endif
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//static int builtin_not_written(char **argv);
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/* Table of built-in functions. They can be forked or not, depending on
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* context: within pipes, they fork. As simple commands, they do not.
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@ -554,42 +555,44 @@ struct built_in_command {
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/* For now, echo and test are unconditionally enabled.
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* Maybe make it configurable? */
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static const struct built_in_command bltins[] = {
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BLTIN("." , builtin_source, "Run commands in a file"),
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BLTIN(":" , builtin_true, "No-op"),
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BLTIN("[" , builtin_test, "Test condition"),
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BLTIN("." , builtin_source , "Run commands in a file"),
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BLTIN(":" , builtin_true , "No-op"),
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BLTIN("[" , builtin_test , "Test condition"),
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#if ENABLE_HUSH_JOB
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BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
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BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"),
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#endif
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#if ENABLE_HUSH_LOOPS
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BLTIN("break" , builtin_break, "Exit from a loop"),
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BLTIN("break" , builtin_break , "Exit from a loop"),
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#endif
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BLTIN("cd" , builtin_cd, "Change directory"),
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BLTIN("cd" , builtin_cd , "Change directory"),
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#if ENABLE_HUSH_LOOPS
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BLTIN("continue", builtin_continue, "Start new loop iteration"),
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#endif
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BLTIN("echo" , builtin_echo, "Write to stdout"),
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BLTIN("eval" , builtin_eval, "Construct and run shell command"),
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BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"),
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BLTIN("exit" , builtin_exit, "Exit"),
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BLTIN("export", builtin_export, "Set environment variable"),
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BLTIN("echo" , builtin_echo , "Write to stdout"),
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BLTIN("eval" , builtin_eval , "Construct and run shell command"),
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BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
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BLTIN("exit" , builtin_exit , "Exit"),
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BLTIN("export" , builtin_export , "Set environment variable"),
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#if ENABLE_HUSH_JOB
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BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
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BLTIN("jobs" , builtin_jobs, "List active jobs"),
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BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"),
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#endif
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BLTIN("pwd" , builtin_pwd, "Print current directory"),
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BLTIN("read" , builtin_read, "Input environment variable"),
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// BLTIN("return", builtin_not_written, "Return from a function"),
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BLTIN("set" , builtin_set, "Set/unset shell local variables"),
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BLTIN("shift" , builtin_shift, "Shift positional parameters"),
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BLTIN("test" , builtin_test, "Test condition"),
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BLTIN("trap" , builtin_trap, "Trap signals"),
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// BLTIN("ulimit", builtin_not_written, "Control resource limits"),
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BLTIN("umask" , builtin_umask, "Set file creation mask"),
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BLTIN("unset" , builtin_unset, "Unset environment variable"),
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BLTIN("wait" , builtin_wait, "Wait for process"),
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#if ENABLE_HUSH_HELP
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BLTIN("help" , builtin_help, "List shell built-in commands"),
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BLTIN("help" , builtin_help , "List shell built-in commands"),
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#endif
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#if ENABLE_HUSH_JOB
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BLTIN("jobs" , builtin_jobs , "List active jobs"),
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#endif
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BLTIN("pwd" , builtin_pwd , "Print current directory"),
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BLTIN("read" , builtin_read , "Input environment variable"),
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// BLTIN("return" , builtin_return , "Return from a function"),
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BLTIN("set" , builtin_set , "Set/unset shell local variables"),
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BLTIN("shift" , builtin_shift , "Shift positional parameters"),
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BLTIN("test" , builtin_test , "Test condition"),
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BLTIN("trap" , builtin_trap , "Trap signals"),
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// BLTIN("ulimit" , builtin_return , "Control resource limits"),
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BLTIN("umask" , builtin_umask , "Set file creation mask"),
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BLTIN("unset" , builtin_unset , "Unset environment variable"),
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BLTIN("wait" , builtin_wait , "Wait for process"),
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};
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@ -2117,7 +2120,7 @@ static void restore_redirects(int squirrel[])
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#endif
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static void free_pipe_list(struct pipe *head, int indent);
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/* return code is the exit status of the pipe */
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/* Return code is the exit status of the pipe */
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static void free_pipe(struct pipe *pi, int indent)
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{
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char **p;
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@ -2125,7 +2128,7 @@ static void free_pipe(struct pipe *pi, int indent)
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struct redir_struct *r, *rnext;
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int a, i;
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if (pi->stopped_cmds > 0)
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if (pi->stopped_cmds > 0) /* why? */
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return;
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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_cmds; i++) {
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@ -2216,9 +2219,7 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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char **new_env;
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const struct built_in_command *x;
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/* If a variable is assigned in a forest, and nobody listens,
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* was it ever really set?
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*/
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/* Case when we are here: ... | var=val | ... */
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if (!argv[assignment_cnt])
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_exit(EXIT_SUCCESS);
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@ -2239,8 +2240,13 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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#endif
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}
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/*
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* Check if the command matches any of the builtins.
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/* On NOMMU, we must never block!
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* Example: { sleep 99999 | read line } & echo Ok
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* read builtin will block on read syscall, leaving parent blocked
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* in vfork. Therefore we can't do this:
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*/
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#if BB_MMU
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/* Check if the command matches any of the builtins.
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* Depending on context, this might be redundant. But it's
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* easier to waste a few CPU cycles than it is to figure out
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* if this is one of those cases.
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@ -2249,33 +2255,35 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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if (strcmp(argv[0], x->cmd) == 0) {
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debug_printf_exec("running builtin '%s'\n", argv[0]);
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rcode = x->function(argv);
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fflush(stdout);
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fflush(NULL);
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_exit(rcode);
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}
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}
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#endif
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/* Check if the command matches any busybox applets */
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#if ENABLE_FEATURE_SH_STANDALONE
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/* Check if the command matches any busybox applets */
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if (strchr(argv[0], '/') == NULL) {
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int a = find_applet_by_name(argv[0]);
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if (a >= 0) {
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#if BB_MMU /* see above why on NOMMU it is not allowed */
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if (APPLET_IS_NOEXEC(a)) {
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debug_printf_exec("running applet '%s'\n", argv[0]);
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// is it ok that run_applet_no_and_exit() does exit(), not _exit()?
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run_applet_no_and_exit(a, argv);
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}
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/* re-exec ourselves with the new arguments */
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#endif
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/* Re-exec ourselves */
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debug_printf_exec("re-execing applet '%s'\n", argv[0]);
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execvp(bb_busybox_exec_path, argv);
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sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
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execv(bb_busybox_exec_path, argv);
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/* If they called chroot or otherwise made the binary no longer
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* executable, fall through */
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}
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}
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#endif
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sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
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debug_printf_exec("execing '%s'\n", argv[0]);
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sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
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execvp(argv[0], argv);
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bb_perror_msg("can't exec '%s'", argv[0]);
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_exit(EXIT_FAILURE);
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@ -2317,8 +2325,8 @@ static void pseudo_exec(nommu_save_t *nommu_save,
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#endif
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}
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/* Can happen. See what bash does with ">foo" by itself. */
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debug_printf("pseudo_exec'ed null command\n");
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/* Case when we are here: ... | >file */
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debug_printf_exec("pseudo_exec'ed null command\n");
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_exit(EXIT_SUCCESS);
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}
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@ -2569,8 +2577,8 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
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}
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#endif
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/* run_pipe() starts all the jobs, but doesn't wait for anything
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* to finish. See checkjobs().
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/* Start all the jobs, but don't wait for anything to finish.
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* See checkjobs().
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*
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* Return code is normally -1, when the caller has to wait for children
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* to finish to determine the exit status of the pipe. If the pipe
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@ -2588,7 +2596,7 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
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* cmd || ... { list } || ...
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* If it is, then we can run cmd as a builtin, NOFORK [do we do this?],
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* or (if SH_STANDALONE) an applet, and we can run the { list }
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* with run_list(). Otherwise, we fork and exec cmd.
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* with run_list(). If it isn't one of these, we fork and exec cmd.
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*
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* Cases when we must fork:
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* non-single: cmd | cmd
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@ -3771,7 +3779,7 @@ static FILE *generate_stream_from_string(const char *s)
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* echo OK
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*/
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//TODO: pass non-exported variables, traps, and functions
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execl(CONFIG_BUSYBOX_EXEC_PATH, "hush", "-c", s, NULL);
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execl(bb_busybox_exec_path, "hush", "-c", s, NULL);
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_exit(127);
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#endif
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}
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@ -5144,7 +5152,7 @@ static int builtin_fg_bg(char **argv)
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found:
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// TODO: bash prints a string representation
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// of job being foregrounded (like "sleep 1 | cat")
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if (*argv[0] == 'f') {
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if (argv[0][0] == 'f') {
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/* Put the job into the foreground. */
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tcsetpgrp(G_interactive_fd, pi->pgrp);
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}
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@ -5162,12 +5170,11 @@ static int builtin_fg_bg(char **argv)
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if (errno == ESRCH) {
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delete_finished_bg_job(pi);
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return EXIT_SUCCESS;
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} else {
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bb_perror_msg("kill (SIGCONT)");
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}
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bb_perror_msg("kill (SIGCONT)");
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}
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if (*argv[0] == 'f') {
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if (argv[0][0] == 'f') {
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remove_bg_job(pi);
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return checkjobs_and_fg_shell(pi);
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}
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@ -5180,8 +5187,9 @@ static int builtin_help(char **argv UNUSED_PARAM)
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{
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const struct built_in_command *x;
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printf("\nBuilt-in commands:\n");
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printf("-------------------\n");
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printf("\n"
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"Built-in commands:\n"
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"------------------\n");
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for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
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printf("%s\t%s\n", x->cmd, x->descr);
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}
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@ -312,8 +312,9 @@ static int builtin_help(struct child_prog UNUSED_PARAM *dummy)
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{
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const struct built_in_command *x;
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printf("\nBuilt-in commands:\n"
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"-------------------\n");
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printf("\n"
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"Built-in commands:\n"
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"------------------\n");
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for (x = bltins; x <= &VEC_LAST(bltins); x++) {
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if (x->descr == NULL)
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continue;
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@ -35,7 +35,6 @@
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# include <assert.h>
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# define bb_dev_null "/dev/null"
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# define DEFAULT_SHELL "/proc/self/exe"
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# define CONFIG_BUSYBOX_EXEC_PATH "/proc/self/exe"
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# define bb_banner "busybox standalone"
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# define ENABLE_FEATURE_SH_STANDALONE 0
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# define bb_msg_memory_exhausted "memory exhausted"
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@ -3176,8 +3175,9 @@ static int dohelp(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM)
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int col;
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const struct builtincmd *x;
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puts("\nBuilt-in commands:\n"
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"-------------------");
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printf("\n"
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"Built-in commands:\n"
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"------------------\n");
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col = 0;
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x = builtincmds;
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