make a few struct bb_applet members conditional
rename sllep_and_die -> xfunc_die make fflush_stdout_and_exit NOFORK-safe fix some buglets found by randomconfig
This commit is contained in:
parent
07c394e69b
commit
335b63d8d1
@ -43,13 +43,13 @@ static const char usage_messages[] =
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#define usage_messages 0
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#endif /* SHOW_USAGE */
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/* Define struct BB_applet applets[] */
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/* Define struct bb_applet applets[] */
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#include "applets.h"
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/* The -1 arises because of the {0,NULL,0,-1} entry. */
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const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(struct BB_applet) - 1;
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const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(applets[0]) - 1;
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const struct BB_applet *current_applet;
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const struct bb_applet *current_applet;
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const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
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#ifdef BB_NOMMU
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bool re_execed;
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@ -61,7 +61,7 @@ bool re_execed;
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/* applets[] is const, so we have to define this "override" structure */
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static struct BB_suid_config {
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const struct BB_applet *m_applet;
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const struct bb_applet *m_applet;
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uid_t m_uid;
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gid_t m_gid;
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mode_t m_mode;
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@ -130,7 +130,7 @@ static void parse_config_file(void)
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{
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struct BB_suid_config *sct_head;
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struct BB_suid_config *sct;
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const struct BB_applet *applet;
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const struct bb_applet *applet;
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FILE *f;
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const char *errmsg;
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char *s;
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@ -329,7 +329,7 @@ static void parse_config_file(void)
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#if ENABLE_FEATURE_SUID
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static void check_suid(const struct BB_applet *applet)
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static void check_suid(const struct bb_applet *applet)
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{
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uid_t ruid = getuid(); /* real [ug]id */
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uid_t rgid = getgid();
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@ -464,45 +464,42 @@ void bb_show_usage(void)
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applet_name, usage_string);
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}
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sleep_and_die();
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xfunc_die();
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}
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static int applet_name_compare(const void *name, const void *vapplet)
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{
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const struct BB_applet *applet = vapplet;
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const struct bb_applet *applet = vapplet;
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return strcmp(name, applet->name);
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}
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const struct BB_applet *find_applet_by_name(const char *name)
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const struct bb_applet *find_applet_by_name(const char *name)
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{
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/* Do a binary search to find the applet entry given the name. */
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return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
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return bsearch(name, applets, NUM_APPLETS, sizeof(applets[0]),
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applet_name_compare);
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}
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#if ENABLE_FEATURE_INSTALLER
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/*
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* directory table
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* this should be consistent w/ the enum, busybox.h::Location,
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* or else...
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*/
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static const char usr_bin [] = "/usr/bin";
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static const char usr_sbin[] = "/usr/sbin";
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static const char *const install_dir[] = {
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/* create (sym)links for each applet */
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static void install_links(const char *busybox, int use_symbolic_links)
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{
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/* directory table
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* this should be consistent w/ the enum,
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* busybox.h::bb_install_loc_t, or else... */
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static const char usr_bin [] = "/usr/bin";
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static const char usr_sbin[] = "/usr/sbin";
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static const char *const install_dir[] = {
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&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
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&usr_bin [4], /* "/bin" */
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&usr_sbin[4], /* "/sbin" */
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usr_bin,
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usr_sbin
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};
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};
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/* create (sym)links for each applet */
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static void install_links(const char *busybox, int use_symbolic_links)
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{
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int (*lf)(const char *, const char *) = link;
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char *fpc;
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int i;
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@ -513,7 +510,7 @@ static void install_links(const char *busybox, int use_symbolic_links)
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for (i = 0; applets[i].name != NULL; i++) {
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fpc = concat_path_file(
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install_dir[applets[i].location],
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install_dir[applets[i].install_loc],
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applets[i].name);
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rc = lf(busybox, fpc);
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if (rc != 0 && errno != EEXIST) {
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@ -557,7 +554,7 @@ static int busybox_main(int argc, char **argv)
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applet_name = argv[2];
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run_applet_by_name(applet_name, 2, argv);
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} else {
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const struct BB_applet *a;
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const struct bb_applet *a;
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int col, output_width;
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output_width = 80 - sizeof("start-stop-daemon, ") - 8;
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@ -35,12 +35,15 @@ DPKG_FILES:= \
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get_header_tar.o \
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filter_accept_list_reassign.o
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# open_transformer uses fork. Compile it only if absolutely necessary
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# open_transformer uses fork(). Compile it only if absolutely necessary
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lib-$(CONFIG_RPM) += open_transformer.o
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lib-$(CONFIG_FEATURE_TAR_BZIP2) += open_transformer.o
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lib-$(CONFIG_FEATURE_TAR_LZMA) += open_transformer.o
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lib-$(CONFIG_FEATURE_TAR_GZIP) += open_transformer.o
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lib-$(CONFIG_FEATURE_TAR_COMPRESS) += open_transformer.o
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lib-$(CONFIG_FEATURE_DEB_TAR_GZ) += open_transformer.o
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lib-$(CONFIG_FEATURE_DEB_TAR_BZ2) += open_transformer.o
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lib-$(CONFIG_FEATURE_DEB_TAR_LZMA) += open_transformer.o
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lib-$(CONFIG_AR) += get_header_ar.o unpack_ar_archive.o
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lib-$(CONFIG_BUNZIP2) += decompress_bunzip2.o
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@ -23,14 +23,14 @@
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#include "busybox.h"
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static FILE *cmp_xfopen_input(const char * const filename)
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static FILE *cmp_xfopen_input(const char *filename)
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{
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FILE *fp;
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fp = fopen_or_warn_stdin(filename);
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if (fp)
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return fp;
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sleep_and_die(); /* We already output an error message. */
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xfunc_die(); /* We already output an error message. */
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}
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static const char fmt_eof[] = "cmp: EOF on %s\n";
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@ -107,7 +107,9 @@ int bb_echo(char **argv)
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putchar(' ');
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}
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#if ENABLE_FEATURE_FANCY_ECHO
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newline_ret:
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#endif
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if (nflag) {
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putchar('\n');
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}
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@ -52,12 +52,12 @@ s - suid type:
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# define APPLET_NOFORK(name,main,l,s,name2) LINK l name
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#else
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const struct BB_applet applets[] = { /* name,main,location,need_suid */
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# define APPLET(name,l,s) {#name,name##_main,l,s},
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# define APPLET_NOUSAGE(name,main,l,s) {#name,main##_main,l,s},
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# define APPLET_ODDNAME(name,main,l,s,name2) {#name,main##_main,l,s},
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# define APPLET_NOEXEC(name,main,l,s,name2) {#name,main##_main,l,s,1},
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# define APPLET_NOFORK(name,main,l,s,name2) {#name,main##_main,l,s,1,1},
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const struct bb_applet applets[] = { /* name, main, location, need_suid */
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# define APPLET(name,l,s) { #name, name##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) },
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# define APPLET_NOUSAGE(name,main,l,s) { #name, main##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) },
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# define APPLET_ODDNAME(name,main,l,s,name2) { #name, main##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) },
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# define APPLET_NOEXEC(name,main,l,s,name2) { #name, main##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) USE_FEATURE_EXEC_PREFER_APPLETS(,1) },
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# define APPLET_NOFORK(name,main,l,s,name2) { #name, main##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) USE_FEATURE_EXEC_PREFER_APPLETS(,1 ,1) },
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#endif
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#if ENABLE_INSTALL_NO_USR
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@ -355,7 +355,7 @@ USE_GUNZIP(APPLET_ODDNAME(zcat, gunzip, _BB_DIR_BIN, _BB_SUID_NEVER, zcat))
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USE_ZCIP(APPLET(zcip, _BB_DIR_SBIN, _BB_SUID_NEVER))
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#if !defined(PROTOTYPES) && !defined(MAKE_USAGE)
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{ 0, NULL, 0, 0 }
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{ NULL }
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};
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#endif
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@ -9,26 +9,35 @@
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#include "libbb.h"
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#if ENABLE_FEATURE_INSTALLER
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/* order matters: used as index into "install_dir[]" in busybox.c */
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enum Location {
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typedef enum bb_install_loc_t {
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_BB_DIR_ROOT = 0,
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_BB_DIR_BIN,
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_BB_DIR_SBIN,
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_BB_DIR_USR_BIN,
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_BB_DIR_USR_SBIN
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};
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} bb_install_loc_t;
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#endif
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enum SUIDRoot {
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#if ENABLE_FEATURE_SUID
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typedef enum bb_suid_t {
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_BB_SUID_NEVER = 0,
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_BB_SUID_MAYBE,
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_BB_SUID_ALWAYS
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};
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} bb_suid_t;
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#endif
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struct BB_applet {
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struct bb_applet {
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const char *name;
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int (*main) (int argc, char **argv);
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__extension__ enum Location location:8;
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__extension__ enum SUIDRoot need_suid:8;
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#if ENABLE_FEATURE_INSTALLER
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__extension__ enum bb_install_loc_t install_loc:8;
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#endif
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#if ENABLE_FEATURE_SUID
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__extension__ enum bb_suid_t need_suid:8;
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#endif
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#if ENABLE_FEATURE_EXEC_PREFER_APPLETS
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/* true if instead if fork(); exec("applet"); waitpid();
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* one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
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unsigned char noexec;
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@ -36,10 +45,11 @@ struct BB_applet {
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/* true if instead if fork(); exec("applet"); waitpid();
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* one can simply call applet_main(argc,argv); */
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unsigned char nofork;
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#endif
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};
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/* Defined in applet.c */
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extern const struct BB_applet applets[];
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extern const struct bb_applet applets[];
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extern const unsigned short NUM_APPLETS;
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#endif /* _BB_INTERNAL_H_ */
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@ -608,7 +608,7 @@ llist_t *llist_rev(llist_t *list);
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int write_pidfile(const char *path);
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#define remove_pidfile(f) ((void)unlink(f))
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#else
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#define write_pidfile(f) 1
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#define write_pidfile(f) TRUE
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#define remove_pidfile(f) ((void)0)
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#endif
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@ -623,7 +623,7 @@ extern smallint logmode;
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extern int die_sleep;
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extern int xfunc_error_retval;
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extern jmp_buf die_jmp;
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extern void sleep_and_die(void) ATTRIBUTE_NORETURN;
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extern void xfunc_die(void) ATTRIBUTE_NORETURN;
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extern void bb_show_usage(void) ATTRIBUTE_NORETURN ATTRIBUTE_EXTERNALLY_VISIBLE;
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extern void bb_error_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
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extern void bb_error_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2)));
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@ -670,8 +670,8 @@ const struct hwtype *get_hwntype(int type);
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#ifndef BUILD_INDIVIDUAL
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struct BB_applet;
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extern const struct BB_applet *find_applet_by_name(const char *name);
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struct bb_applet;
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extern const struct bb_applet *find_applet_by_name(const char *name);
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/* Returns only if applet is not found. */
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extern void run_applet_by_name(const char *name, int argc, char **argv);
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extern void run_current_applet_and_exit(int argc, char **argv) ATTRIBUTE_NORETURN;
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@ -880,7 +880,7 @@ enum { /* DO NOT CHANGE THESE VALUES! cp.c, mv.c, install.c depend on them. */
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};
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#define FILEUTILS_CP_OPTSTR "pdRfils" USE_SELINUX("c")
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extern const struct BB_applet *current_applet;
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extern const struct bb_applet *current_applet;
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extern const char *applet_name;
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extern const char BB_BANNER[];
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@ -74,7 +74,7 @@ void complain_copyfd_and_die(off_t sz)
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if (sz != -1)
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bb_error_msg_and_die("short read");
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/* if sz == -1, bb_copyfd_XX already complained */
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sleep_and_die();
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xfunc_die();
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}
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#endif
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@ -94,7 +94,7 @@ void bb_copyfd_exact_size(int fd1, int fd2, off_t size)
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if (sz != -1)
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bb_error_msg_and_die("short read");
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/* if sz == -1, bb_copyfd_XX already complained */
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sleep_and_die();
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xfunc_die();
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}
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off_t bb_copyfd_eof(int fd1, int fd2)
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@ -10,14 +10,25 @@
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#include "libbb.h"
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int die_sleep;
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#if ENABLE_FEATURE_EXEC_PREFER_APPLETS
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jmp_buf die_jmp;
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#endif
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void sleep_and_die(void)
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void xfunc_die(void)
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{
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if (die_sleep) {
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/* Special case: don't die, but jump */
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if (die_sleep < 0)
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longjmp(die_jmp, xfunc_error_retval);
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if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && die_sleep < 0) {
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/* Special case. We arrive here if NOFORK applet
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* calls xfunc, which then decides to die.
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* We don't die, but jump instead back to caller.
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* NOFORK applets still cannot carelessly call xfuncs:
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* p = xmalloc(10);
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* q = xmalloc(10); // BUG! if this dies, we leak p!
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*/
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/* -111 means "zero" (longjmp can't pass 0)
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* spawn_and_wait() catches -111. */
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longjmp(die_jmp, xfunc_error_retval ? xfunc_error_retval : -111);
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}
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sleep(die_sleep);
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}
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exit(xfunc_error_retval);
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@ -30,5 +41,5 @@ void bb_error_msg_and_die(const char *s, ...)
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va_start(p, s);
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bb_verror_msg(s, p, NULL);
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va_end(p);
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sleep_and_die();
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xfunc_die();
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}
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@ -13,13 +13,17 @@
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#include "libbb.h"
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// TODO: make it safe to call from NOFORK applets
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// Currently, it can exit(0). Even if it is made to do longjmp trick
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// (see sleep_and_die internals), zero cannot be passed thru this way!
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void fflush_stdout_and_exit(int retval)
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{
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if (fflush(stdout))
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sleep_and_die();
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xfunc_die();
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if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && die_sleep < 0) {
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/* We are in NOFORK applet. Do not exit() directly,
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* but use xfunc_die() */
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xfunc_error_retval = retval;
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xfunc_die();
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}
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exit(retval);
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}
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@ -7,9 +7,6 @@
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include "libbb.h"
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void bb_herror_msg_and_die(const char *s, ...)
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@ -19,5 +16,5 @@ void bb_herror_msg_and_die(const char *s, ...)
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va_start(p, s);
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bb_vherror_msg(s, p);
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va_end(p);
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sleep_and_die();
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xfunc_die();
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}
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@ -7,10 +7,6 @@
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "libbb.h"
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void bb_perror_msg_and_die(const char *s, ...)
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@ -20,5 +16,5 @@ void bb_perror_msg_and_die(const char *s, ...)
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va_start(p, s);
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bb_vperror_msg(s, p);
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va_end(p);
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sleep_and_die();
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xfunc_die();
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}
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@ -16,7 +16,7 @@
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*/
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#include <paths.h>
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#include "busybox.h" /* for struct BB_applet */
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#include "busybox.h" /* for struct bb_applet */
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/* This does a fork/exec in one call, using vfork(). Returns PID of new child,
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* -1 for failure. Runs argv[0], searching path if that has no / in it. */
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@ -104,8 +104,9 @@ int spawn_and_wait(char **argv)
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{
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int rc;
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if (ENABLE_FEATURE_EXEC_PREFER_APPLETS) {
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const struct BB_applet *a = find_applet_by_name(argv[0]);
|
||||
#if ENABLE_FEATURE_EXEC_PREFER_APPLETS
|
||||
{
|
||||
const struct bb_applet *a = find_applet_by_name(argv[0]);
|
||||
if (a && (a->nofork
|
||||
#ifndef BB_NOMMU
|
||||
|| a->noexec /* NOEXEC cannot be used on NOMMU */
|
||||
@ -120,19 +121,27 @@ int spawn_and_wait(char **argv)
|
||||
#endif
|
||||
{
|
||||
int old_sleep = die_sleep;
|
||||
int old_x = xfunc_error_retval;
|
||||
die_sleep = -1; /* special flag */
|
||||
/* sleep_and_die() checks for it */
|
||||
/* xfunc_die() checks for it */
|
||||
|
||||
rc = setjmp(die_jmp);
|
||||
if (!rc) {
|
||||
const struct BB_applet *old_a = current_applet;
|
||||
const struct bb_applet *old_a = current_applet;
|
||||
current_applet = a;
|
||||
applet_name = a->name;
|
||||
// what else should we save/restore?
|
||||
rc = a->main(argc, argv);
|
||||
current_applet = old_a;
|
||||
applet_name = old_a->name;
|
||||
} else {
|
||||
/* xfunc died in NOFORK applet */
|
||||
if (rc == -111)
|
||||
rc = 0;
|
||||
}
|
||||
|
||||
die_sleep = old_sleep;
|
||||
xfunc_error_retval = old_x;
|
||||
return rc;
|
||||
}
|
||||
#ifndef BB_NOMMU /* MMU only */
|
||||
@ -145,9 +154,13 @@ int spawn_and_wait(char **argv)
|
||||
run_current_applet_and_exit(argc, argv);
|
||||
#endif
|
||||
}
|
||||
|
||||
}
|
||||
rc = spawn(argv);
|
||||
w:
|
||||
#else /* !FEATURE_EXEC_PREFER_APPLETS */
|
||||
rc = spawn(argv);
|
||||
#endif /* FEATURE_EXEC_PREFER_APPLETS */
|
||||
return wait4pid(rc);
|
||||
}
|
||||
|
||||
|
@ -166,7 +166,7 @@ USE_FEATURE_IPV6(sa_family_t af,)
|
||||
if (rc || !result) {
|
||||
bb_error_msg("bad address '%s'", org_host);
|
||||
if (ai_flags & DIE_ON_ERROR)
|
||||
sleep_and_die();
|
||||
xfunc_die();
|
||||
goto ret;
|
||||
}
|
||||
r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen);
|
||||
|
@ -476,7 +476,7 @@ void xprint_and_close_file(FILE *file)
|
||||
fflush(stdout);
|
||||
// copyfd outputs error messages for us.
|
||||
if (bb_copyfd_eof(fileno(file), 1) == -1)
|
||||
sleep_and_die();
|
||||
xfunc_die();
|
||||
|
||||
fclose(file);
|
||||
}
|
||||
|
@ -6533,7 +6533,7 @@ tryexec(char *cmd, char **argv, char **envp)
|
||||
|
||||
#if ENABLE_FEATURE_SH_STANDALONE_SHELL
|
||||
if (strchr(cmd, '/') == NULL) {
|
||||
const struct BB_applet *a;
|
||||
const struct bb_applet *a;
|
||||
|
||||
a = find_applet_by_name(cmd);
|
||||
if (a) {
|
||||
|
@ -3197,7 +3197,7 @@ static int dohelp(struct op *t)
|
||||
}
|
||||
#if ENABLE_FEATURE_SH_STANDALONE_SHELL
|
||||
{
|
||||
const struct BB_applet *applet = applets;
|
||||
const struct bb_applet *applet = applets;
|
||||
|
||||
while (applet->name) {
|
||||
col += printf("%c%s", ((col == 0) ? '\t' : ' '), applet->name);
|
||||
|
@ -51,10 +51,8 @@ enum {
|
||||
OPT_s = 0x10, // -s
|
||||
OPT_T = 0x20, // -T
|
||||
OPT_u = 0x40, // -u
|
||||
#if ENABLE_GETOPT_LONG
|
||||
OPT_a = 0x80, // -a
|
||||
OPT_l = 0x100, // -l
|
||||
#endif
|
||||
SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */
|
||||
};
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user