mirror of
https://github.com/sheumann/hush.git
synced 2024-06-26 02:29:31 +00:00
hush: fix trashing of environment by local env vars:
a=a; a=b cmd; - a was unset! +57 bytes function old new delta add_string_to_strings - 110 +110 putenv_all - 27 +27 run_list 2086 2111 +25 free_strings - 7 +7 free_pipe 210 208 -2 add_malloced_string_to_strings 110 - -110 ------------------------------------------------------------------------------ (add/remove: 3/1 grow/shrink: 1/1 up/down: 169/-112) Total: 57 bytes
This commit is contained in:
Denis Vlasenko
parent
1e19afd38a
commit
22d10a0292
166
shell/hush.c
166
shell/hush.c
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@ -614,7 +614,7 @@ static char *unbackslash(char *src)
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return dst;
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}
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static char **add_malloced_strings_to_strings(char **strings, char **add)
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static char **add_strings_to_strings(char **strings, char **add)
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{
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int i;
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unsigned count1;
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@ -643,14 +643,37 @@ static char **add_malloced_strings_to_strings(char **strings, char **add)
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return v;
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}
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static char **add_malloced_string_to_strings(char **strings, char *add)
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static char **add_string_to_strings(char **strings, char *add)
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{
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char *v[2];
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v[0] = add;
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v[1] = NULL;
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return add_strings_to_strings(strings, v);
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}
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return add_malloced_strings_to_strings(strings, v);
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static void putenv_all(char **strings)
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{
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if (!strings)
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return;
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while (*strings)
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putenv(*strings++);
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}
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static char **putenv_all_and_save_old(char **strings)
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{
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char **old = NULL;
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char **s = strings;
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if (!strings)
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return old;
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while (*strings) {
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char *v = getenv(*strings++);
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if (!v)
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continue;
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old = add_string_to_strings(old, v);
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}
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putenv_all(s);
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return old;
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}
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static void free_strings_and_unsetenv(char **strings, int unset)
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@ -1432,7 +1455,7 @@ static void pseudo_exec_argv(char ***ptr_ptrs2free, char **argv, int assignment_
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p = expand_string_to_string(*argv);
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putenv(p);
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#if !BB_MMU
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*ptr_ptrs2free = add_malloced_string_to_strings(*ptr_ptrs2free, p);
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*ptr_ptrs2free = add_string_to_strings(*ptr_ptrs2free, p);
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#endif
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argv++;
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}
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@ -1442,8 +1465,8 @@ static void pseudo_exec_argv(char ***ptr_ptrs2free, char **argv, int assignment_
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argv = expand_strvec_to_strvec(argv);
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#if !BB_MMU
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/* Inserting magic guard pointer to not unsetenv junk later */
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*ptr_ptrs2free = add_malloced_string_to_strings(*ptr_ptrs2free, (char*)hush_version_str);
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*ptr_ptrs2free = add_malloced_string_to_strings(*ptr_ptrs2free, (char*)argv);
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*ptr_ptrs2free = add_string_to_strings(*ptr_ptrs2free, (char*)hush_version_str);
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*ptr_ptrs2free = add_string_to_strings(*ptr_ptrs2free, (char*)argv);
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#endif
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}
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@ -1762,14 +1785,24 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
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* Returns -1 only if started some children. IOW: we have to
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* mask out retvals of builtins etc with 0xff!
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*/
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/* A little helper first */
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static char **expand_assignments(char **argv, int count)
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{
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int i;
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char **p = NULL;
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/* Expand assignments into one string each */
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for (i = 0; i < count; i++) {
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p = add_string_to_strings(p, expand_string_to_string(argv[i]));
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}
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return p;
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}
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static int run_pipe(struct pipe *pi)
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{
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int i;
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int nextin;
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int pipefds[2]; /* pipefds[0] is for reading */
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struct command *command;
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char **ptrs2free = NULL;
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char **argv_expanded = NULL;
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char **argv_expanded;
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char **argv;
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const struct built_in_command *x;
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char *p;
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@ -1791,6 +1824,7 @@ static int run_pipe(struct pipe *pi)
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* pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
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*/
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command = &(pi->cmds[0]);
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if (single_and_fg && command->group && command->subshell == 0) {
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debug_printf("non-subshell grouping\n");
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setup_redirects(command, squirrel);
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@ -1803,8 +1837,12 @@ static int run_pipe(struct pipe *pi)
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}
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argv = command->argv;
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argv_expanded = NULL;
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if (single_and_fg && argv != NULL) {
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char **new_env = NULL;
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char **old_env = NULL;
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i = command->assignment_cnt;
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if (i != 0 && argv[i] == NULL) {
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/* assignments, but no command: set local environment */
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@ -1816,52 +1854,49 @@ static int run_pipe(struct pipe *pi)
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return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
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}
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/* Expand assignments into one string each */
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for (i = 0; i < command->assignment_cnt; i++) {
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p = expand_string_to_string(argv[i]);
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putenv(p);
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ptrs2free = add_malloced_string_to_strings(ptrs2free, p);
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}
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/* Expand the rest into (possibly) many strings each */
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argv_expanded = expand_strvec_to_strvec(argv + i);
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for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
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if (strcmp(argv_expanded[0], x->cmd) == 0) {
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if (x->function == builtin_exec && argv_expanded[1] == NULL) {
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debug_printf("exec with redirects only\n");
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setup_redirects(command, NULL);
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rcode = EXIT_SUCCESS;
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goto clean_up_and_ret1;
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}
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debug_printf("builtin inline %s\n", argv_expanded[0]);
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/* XXX setup_redirects acts on file descriptors, not FILEs.
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* This is perfect for work that comes after exec().
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* Is it really safe for inline use? Experimentally,
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* things seem to work with glibc. */
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setup_redirects(command, squirrel);
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debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv_expanded[1]);
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rcode = x->function(argv_expanded) & 0xff;
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USE_FEATURE_SH_STANDALONE(clean_up_and_ret:)
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restore_redirects(squirrel);
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clean_up_and_ret1:
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free_strings_and_unsetenv(ptrs2free, 1);
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free(argv_expanded);
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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debug_printf_exec("run_pipe return %d\n", rcode);
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return rcode;
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if (strcmp(argv_expanded[0], x->cmd) != 0)
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continue;
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if (x->function == builtin_exec && argv_expanded[1] == NULL) {
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debug_printf("exec with redirects only\n");
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setup_redirects(command, NULL);
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rcode = EXIT_SUCCESS;
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goto clean_up_and_ret1;
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}
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debug_printf("builtin inline %s\n", argv_expanded[0]);
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/* XXX setup_redirects acts on file descriptors, not FILEs.
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* This is perfect for work that comes after exec().
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* Is it really safe for inline use? Experimentally,
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* things seem to work with glibc. */
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setup_redirects(command, squirrel);
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_env = putenv_all_and_save_old(new_env);
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debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv_expanded[1]);
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rcode = x->function(argv_expanded) & 0xff;
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USE_FEATURE_SH_STANDALONE(clean_up_and_ret:)
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restore_redirects(squirrel);
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free_strings_and_unsetenv(new_env, 1);
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putenv_all(old_env);
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free_strings(old_env);
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clean_up_and_ret1:
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free(argv_expanded);
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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debug_printf_exec("run_pipe return %d\n", rcode);
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return rcode;
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}
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#if ENABLE_FEATURE_SH_STANDALONE
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{
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int a = find_applet_by_name(argv_expanded[0]);
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if (a >= 0 && APPLET_IS_NOFORK(a)) {
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setup_redirects(command, squirrel);
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save_nofork_data(&G.nofork_save);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
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rcode = run_nofork_applet_prime(&G.nofork_save, a, argv_expanded);
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goto clean_up_and_ret;
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}
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i = find_applet_by_name(argv_expanded[0]);
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if (i >= 0 && APPLET_IS_NOFORK(i)) {
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setup_redirects(command, squirrel);
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save_nofork_data(&G.nofork_save);
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_env = putenv_all_and_save_old(new_env);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]);
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rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded);
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goto clean_up_and_ret;
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}
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#endif
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}
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@ -1883,7 +1918,7 @@ static int run_pipe(struct pipe *pi)
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/* Avoid confusion WHAT is volatile. Pointer is volatile,
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* not the stuff it points to. */
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typedef char **ppchar_t;
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volatile ppchar_t shared_across_vfork;
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volatile ppchar_t shared_across_vfork = NULL;
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#endif
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command = &(pi->cmds[i]);
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@ -1898,9 +1933,6 @@ static int run_pipe(struct pipe *pi)
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if ((i + 1) < pi->num_cmds)
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xpipe(pipefds);
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#if !BB_MMU
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shared_across_vfork = ptrs2free;
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#endif
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command->pid = BB_MMU ? fork() : vfork();
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if (!command->pid) { /* child */
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if (ENABLE_HUSH_JOB)
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@ -1941,12 +1973,11 @@ for single_and_fg, it's already set yes? */
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}
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/* parent */
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#if !BB_MMU
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ptrs2free = shared_across_vfork;
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//BUG: does not restore OLD env var contents
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free_strings_and_unsetenv((char **)shared_across_vfork, 1);
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#endif
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free(argv_expanded);
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argv_expanded = NULL;
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free_strings_and_unsetenv(ptrs2free, 1);
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ptrs2free = NULL;
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if (command->pid < 0) { /* [v]fork failed */
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/* Clearly indicate, was it fork or vfork */
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bb_perror_msg(BB_MMU ? "fork" : "vfork");
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@ -3145,7 +3176,7 @@ static int done_word(o_string *word, struct parse_context *ctx)
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o_addchr(word, SPECIAL_VAR_SYMBOL);
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}
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}
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command->argv = add_malloced_string_to_strings(command->argv, xstrdup(word->data));
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command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
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debug_print_strings("word appended to argv", command->argv);
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}
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@ -3436,6 +3467,11 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
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endch = ")";
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command->subshell = 1;
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}
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#if 0 /* TODO function support */
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if (ch == 'F') { /* function definition */
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command->subshell = 2;
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}
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#endif
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rcode = parse_stream(dest, &sub, input, endch);
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if (rcode == 0) {
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done_word(dest, &sub); /* finish off the final word in the subcontext */
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@ -3929,10 +3965,10 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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case '(':
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#if ENABLE_HUSH_CASE
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/* "case... in [(]word)..." - skip '(' */
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if (dest->length == 0 /* not word(... */
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&& dest->nonnull == 0 /* not ""(... */
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&& ctx->ctx_res_w == RES_MATCH
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if (ctx->ctx_res_w == RES_MATCH
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&& ctx->command->argv == NULL /* not (word|(... */
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&& dest->length == 0 /* not word(... */
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&& dest->nonnull == 0 /* not ""(... */
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) {
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continue;
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}
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@ -3942,10 +3978,18 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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&& dest->nonnull == 0 /* not a"b"c() */
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&& ctx->command->argv == NULL /* it's the first word */
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&& i_peek(input) == ')'
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&& !match_reserved_word(dest)
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) {
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bb_error_msg("seems like a function definition");
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if (match_reserved_word(dest))
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bb_error_msg("but '%s' is a reserved word!", dest->data);
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i_getch(input);
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do {
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ch = i_getch(input);
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} while (ch == ' ' || ch == '\n');
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if (ch != '{') {
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syntax("was expecting {");
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debug_printf_parse("parse_stream return 1\n");
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return 1;
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}
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}
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#endif
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case '{':
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@ -165,7 +165,7 @@ config FINDFS
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default n
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select VOLUMEID
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help
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Prints the name of a filesystem with given laver or UUID.
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Prints the name of a filesystem with given label or UUID.
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WARNING:
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With all submodules selected, it will add ~8k to busybox.
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