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make a few struct bb_applet members conditional

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rename sllep_and_die -> xfunc_die
make fflush_stdout_and_exit NOFORK-safe
fix some buglets found by randomconfig
This commit is contained in:
Denis Vlasenko 2007-04-10 21:38:30 +00:00
parent 07c394e69b
commit 335b63d8d1
18 changed files with 114 additions and 83 deletions
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53
applets/applets.c
View File

@ -43,13 +43,13 @@ static const char usage_messages[] =
#define usage_messages 0
#endif /* SHOW_USAGE */
/* Define struct BB_applet applets[] */
/* Define struct bb_applet applets[] */
#include "applets.h"
/* The -1 arises because of the {0,NULL,0,-1} entry. */
const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(struct BB_applet) - 1;
const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(applets[0]) - 1;
const struct BB_applet *current_applet;
const struct bb_applet *current_applet;
const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
#ifdef BB_NOMMU
bool re_execed;
@ -61,7 +61,7 @@ bool re_execed;
/* applets[] is const, so we have to define this "override" structure */
static struct BB_suid_config {
const struct BB_applet *m_applet;
const struct bb_applet *m_applet;
uid_t m_uid;
gid_t m_gid;
mode_t m_mode;
@ -130,7 +130,7 @@ static void parse_config_file(void)
{
struct BB_suid_config *sct_head;
struct BB_suid_config *sct;
const struct BB_applet *applet;
const struct bb_applet *applet;
FILE *f;
const char *errmsg;
char *s;
@ -329,7 +329,7 @@ static void parse_config_file(void)
#if ENABLE_FEATURE_SUID
static void check_suid(const struct BB_applet *applet)
static void check_suid(const struct bb_applet *applet)
{
uid_t ruid = getuid(); /* real [ug]id */
uid_t rgid = getgid();
@ -464,45 +464,42 @@ void bb_show_usage(void)
applet_name, usage_string);
}
sleep_and_die();
xfunc_die();
}
static int applet_name_compare(const void *name, const void *vapplet)
{
const struct BB_applet *applet = vapplet;
const struct bb_applet *applet = vapplet;
return strcmp(name, applet->name);
}
const struct BB_applet *find_applet_by_name(const char *name)
const struct bb_applet *find_applet_by_name(const char *name)
{
/* Do a binary search to find the applet entry given the name. */
return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
return bsearch(name, applets, NUM_APPLETS, sizeof(applets[0]),
applet_name_compare);
}
#if ENABLE_FEATURE_INSTALLER
/*
* directory table
* this should be consistent w/ the enum, busybox.h::Location,
* or else...
*/
static const char usr_bin [] = "/usr/bin";
static const char usr_sbin[] = "/usr/sbin";
static const char *const install_dir[] = {
&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
&usr_bin [4], /* "/bin" */
&usr_sbin[4], /* "/sbin" */
usr_bin,
usr_sbin
};
/* create (sym)links for each applet */
static void install_links(const char *busybox, int use_symbolic_links)
{
/* directory table
* this should be consistent w/ the enum,
* busybox.h::bb_install_loc_t, or else... */
static const char usr_bin [] = "/usr/bin";
static const char usr_sbin[] = "/usr/sbin";
static const char *const install_dir[] = {
&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
&usr_bin [4], /* "/bin" */
&usr_sbin[4], /* "/sbin" */
usr_bin,
usr_sbin
};
int (*lf)(const char *, const char *) = link;
char *fpc;
int i;
@ -513,7 +510,7 @@ static void install_links(const char *busybox, int use_symbolic_links)
for (i = 0; applets[i].name != NULL; i++) {
fpc = concat_path_file(
install_dir[applets[i].location],
install_dir[applets[i].install_loc],
applets[i].name);
rc = lf(busybox, fpc);
if (rc != 0 && errno != EEXIST) {
@ -557,7 +554,7 @@ static int busybox_main(int argc, char **argv)
applet_name = argv[2];
run_applet_by_name(applet_name, 2, argv);
} else {
const struct BB_applet *a;
const struct bb_applet *a;
int col, output_width;
output_width = 80 - sizeof("start-stop-daemon, ") - 8;

5
archival/libunarchive/Kbuild
View File

@ -35,12 +35,15 @@ DPKG_FILES:= \
get_header_tar.o \
filter_accept_list_reassign.o
# open_transformer uses fork. Compile it only if absolutely necessary
# open_transformer uses fork(). Compile it only if absolutely necessary
lib-$(CONFIG_RPM) += open_transformer.o
lib-$(CONFIG_FEATURE_TAR_BZIP2) += open_transformer.o
lib-$(CONFIG_FEATURE_TAR_LZMA) += open_transformer.o
lib-$(CONFIG_FEATURE_TAR_GZIP) += open_transformer.o
lib-$(CONFIG_FEATURE_TAR_COMPRESS) += open_transformer.o
lib-$(CONFIG_FEATURE_DEB_TAR_GZ) += open_transformer.o
lib-$(CONFIG_FEATURE_DEB_TAR_BZ2) += open_transformer.o
lib-$(CONFIG_FEATURE_DEB_TAR_LZMA) += open_transformer.o
lib-$(CONFIG_AR) += get_header_ar.o unpack_ar_archive.o
lib-$(CONFIG_BUNZIP2) += decompress_bunzip2.o

4
coreutils/cmp.c
View File

@ -23,14 +23,14 @@
#include "busybox.h"
static FILE *cmp_xfopen_input(const char * const filename)
static FILE *cmp_xfopen_input(const char *filename)
{
FILE *fp;
fp = fopen_or_warn_stdin(filename);
if (fp)
return fp;
sleep_and_die(); /* We already output an error message. */
xfunc_die(); /* We already output an error message. */
}
static const char fmt_eof[] = "cmp: EOF on %s\n";

2
coreutils/echo.c
View File

@ -107,7 +107,9 @@ int bb_echo(char **argv)
putchar(' ');
}
#if ENABLE_FEATURE_FANCY_ECHO
newline_ret:
#endif
if (nflag) {
putchar('\n');
}

14
include/applets.h
View File

@ -52,12 +52,12 @@ s - suid type:
# define APPLET_NOFORK(name,main,l,s,name2) LINK l name
#else
const struct BB_applet applets[] = { /* name,main,location,need_suid */
# define APPLET(name,l,s) {#name,name##_main,l,s},
# define APPLET_NOUSAGE(name,main,l,s) {#name,main##_main,l,s},
# define APPLET_ODDNAME(name,main,l,s,name2) {#name,main##_main,l,s},
# define APPLET_NOEXEC(name,main,l,s,name2) {#name,main##_main,l,s,1},
# define APPLET_NOFORK(name,main,l,s,name2) {#name,main##_main,l,s,1,1},
const struct bb_applet applets[] = { /* name, main, location, need_suid */
# define APPLET(name,l,s) { #name, name##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) },
# define APPLET_NOUSAGE(name,main,l,s) { #name, main##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) },
# define APPLET_ODDNAME(name,main,l,s,name2) { #name, main##_main USE_FEATURE_INSTALLER(,l) USE_FEATURE_SUID(,s) },
# 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) },
# 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) },
#endif
#if ENABLE_INSTALL_NO_USR
@ -355,7 +355,7 @@ USE_GUNZIP(APPLET_ODDNAME(zcat, gunzip, _BB_DIR_BIN, _BB_SUID_NEVER, zcat))
USE_ZCIP(APPLET(zcip, _BB_DIR_SBIN, _BB_SUID_NEVER))
#if !defined(PROTOTYPES) && !defined(MAKE_USAGE)
{ 0, NULL, 0, 0 }
{ NULL }
};
#endif

26
include/busybox.h
View File

@ -9,26 +9,35 @@
#include "libbb.h"
#if ENABLE_FEATURE_INSTALLER
/* order matters: used as index into "install_dir[]" in busybox.c */
enum Location {
typedef enum bb_install_loc_t {
_BB_DIR_ROOT = 0,
_BB_DIR_BIN,
_BB_DIR_SBIN,
_BB_DIR_USR_BIN,
_BB_DIR_USR_SBIN
};
} bb_install_loc_t;
#endif
enum SUIDRoot {
#if ENABLE_FEATURE_SUID
typedef enum bb_suid_t {
_BB_SUID_NEVER = 0,
_BB_SUID_MAYBE,
_BB_SUID_ALWAYS
};
} bb_suid_t;
#endif
struct BB_applet {
struct bb_applet {
const char *name;
int (*main) (int argc, char **argv);
__extension__ enum Location location:8;
__extension__ enum SUIDRoot need_suid:8;
#if ENABLE_FEATURE_INSTALLER
__extension__ enum bb_install_loc_t install_loc:8;
#endif
#if ENABLE_FEATURE_SUID
__extension__ enum bb_suid_t need_suid:8;
#endif
#if ENABLE_FEATURE_EXEC_PREFER_APPLETS
/* true if instead if fork(); exec("applet"); waitpid();
* one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
unsigned char noexec;
@ -36,10 +45,11 @@ struct BB_applet {
/* true if instead if fork(); exec("applet"); waitpid();
* one can simply call applet_main(argc,argv); */
unsigned char nofork;
#endif
};
/* Defined in applet.c */
extern const struct BB_applet applets[];
extern const struct bb_applet applets[];
extern const unsigned short NUM_APPLETS;
#endif /* _BB_INTERNAL_H_ */

10
include/libbb.h
View File

@ -608,7 +608,7 @@ llist_t *llist_rev(llist_t *list);
int write_pidfile(const char *path);
#define remove_pidfile(f) ((void)unlink(f))
#else
#define write_pidfile(f) 1
#define write_pidfile(f) TRUE
#define remove_pidfile(f) ((void)0)
#endif
@ -623,7 +623,7 @@ extern smallint logmode;
extern int die_sleep;
extern int xfunc_error_retval;
extern jmp_buf die_jmp;
extern void sleep_and_die(void) ATTRIBUTE_NORETURN;
extern void xfunc_die(void) ATTRIBUTE_NORETURN;
extern void bb_show_usage(void) ATTRIBUTE_NORETURN ATTRIBUTE_EXTERNALLY_VISIBLE;
extern void bb_error_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
extern void bb_error_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2)));
@ -670,8 +670,8 @@ const struct hwtype *get_hwntype(int type);
#ifndef BUILD_INDIVIDUAL
struct BB_applet;
extern const struct BB_applet *find_applet_by_name(const char *name);
struct bb_applet;
extern const struct bb_applet *find_applet_by_name(const char *name);
/* Returns only if applet is not found. */
extern void run_applet_by_name(const char *name, int argc, char **argv);
extern void run_current_applet_and_exit(int argc, char **argv) ATTRIBUTE_NORETURN;
@ -880,7 +880,7 @@ enum { /* DO NOT CHANGE THESE VALUES! cp.c, mv.c, install.c depend on them. */
};
#define FILEUTILS_CP_OPTSTR "pdRfils" USE_SELINUX("c")
extern const struct BB_applet *current_applet;
extern const struct bb_applet *current_applet;
extern const char *applet_name;
extern const char BB_BANNER[];

4
libbb/copyfd.c
View File

@ -74,7 +74,7 @@ void complain_copyfd_and_die(off_t sz)
if (sz != -1)
bb_error_msg_and_die("short read");
/* if sz == -1, bb_copyfd_XX already complained */
sleep_and_die();
xfunc_die();
}
#endif
@ -94,7 +94,7 @@ void bb_copyfd_exact_size(int fd1, int fd2, off_t size)
if (sz != -1)
bb_error_msg_and_die("short read");
/* if sz == -1, bb_copyfd_XX already complained */
sleep_and_die();
xfunc_die();
}
off_t bb_copyfd_eof(int fd1, int fd2)

21
libbb/error_msg_and_die.c
View File

@ -10,14 +10,25 @@
#include "libbb.h"
int die_sleep;
#if ENABLE_FEATURE_EXEC_PREFER_APPLETS
jmp_buf die_jmp;
#endif
void sleep_and_die(void)
void xfunc_die(void)
{
if (die_sleep) {
/* Special case: don't die, but jump */
if (die_sleep < 0)
longjmp(die_jmp, xfunc_error_retval);
if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && die_sleep < 0) {
/* Special case. We arrive here if NOFORK applet
* calls xfunc, which then decides to die.
* We don't die, but jump instead back to caller.
* NOFORK applets still cannot carelessly call xfuncs:
* p = xmalloc(10);
* q = xmalloc(10); // BUG! if this dies, we leak p!
*/
/* -111 means "zero" (longjmp can't pass 0)
* spawn_and_wait() catches -111. */
longjmp(die_jmp, xfunc_error_retval ? xfunc_error_retval : -111);
}
sleep(die_sleep);
}
exit(xfunc_error_retval);
@ -30,5 +41,5 @@ void bb_error_msg_and_die(const char *s, ...)
va_start(p, s);
bb_verror_msg(s, p, NULL);
va_end(p);
sleep_and_die();
xfunc_die();
}

14
libbb/fflush_stdout_and_exit.c
View File

@ -13,13 +13,17 @@
#include "libbb.h"
// TODO: make it safe to call from NOFORK applets
// Currently, it can exit(0). Even if it is made to do longjmp trick
// (see sleep_and_die internals), zero cannot be passed thru this way!
void fflush_stdout_and_exit(int retval)
{
if (fflush(stdout))
sleep_and_die();
xfunc_die();
if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && die_sleep < 0) {
/* We are in NOFORK applet. Do not exit() directly,
* but use xfunc_die() */
xfunc_error_retval = retval;
xfunc_die();
}
exit(retval);
}

5
libbb/herror_msg_and_die.c
View File

@ -7,9 +7,6 @@
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <stdarg.h>
#include <stdlib.h>
#include "libbb.h"
void bb_herror_msg_and_die(const char *s, ...)
@ -19,5 +16,5 @@ void bb_herror_msg_and_die(const char *s, ...)
va_start(p, s);
bb_vherror_msg(s, p);
va_end(p);
sleep_and_die();
xfunc_die();
}

6
libbb/perror_msg_and_die.c
View File

@ -7,10 +7,6 @@
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "libbb.h"
void bb_perror_msg_and_die(const char *s, ...)
@ -20,5 +16,5 @@ void bb_perror_msg_and_die(const char *s, ...)
va_start(p, s);
bb_vperror_msg(s, p);
va_end(p);
sleep_and_die();
xfunc_die();
}

23
libbb/vfork_daemon_rexec.c
View File

@ -16,7 +16,7 @@
*/
#include <paths.h>
#include "busybox.h" /* for struct BB_applet */
#include "busybox.h" /* for struct bb_applet */
/* This does a fork/exec in one call, using vfork(). Returns PID of new child,
* -1 for failure. Runs argv[0], searching path if that has no / in it. */
@ -104,8 +104,9 @@ int spawn_and_wait(char **argv)
{
int rc;
if (ENABLE_FEATURE_EXEC_PREFER_APPLETS) {
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);
}

2
libbb/xconnect.c
View File

@ -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);

2
libbb/xfuncs.c
View File

@ -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);
}

2
shell/ash.c
View 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) {

2
shell/msh.c
View File

@ -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);

2
util-linux/getopt.c
View File

@ -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 */
};