diff options
| -rw-r--r-- | applets/Kbuild | 18 | ||||
| -rw-r--r-- | applets/applet_tables.c | 55 | ||||
| -rw-r--r-- | include/busybox.h | 29 | ||||
| -rw-r--r-- | libbb/appletlib.c | 14 | ||||
| -rw-r--r-- | libbb/vfork_daemon_rexec.c | 2 |
5 files changed, 71 insertions, 47 deletions
diff --git a/applets/Kbuild b/applets/Kbuild index b9dba03..ef4b76f 100644 --- a/applets/Kbuild +++ b/applets/Kbuild @@ -14,20 +14,20 @@ always:= $(hostprogs-y) # Generated files need additional love -quiet_cmd_gen_usage_compressed = GEN include/usage_compressed.h - cmd_gen_usage_compressed = $(srctree)/applets/usage_compressed include/usage_compressed.h applets - HOSTCFLAGS_usage.o = -I$(srctree)/include -applets/applets.o: include/usage_compressed.h include/applet_tables.h +applets/applets.o: include/usage_compressed.h include/applet_tables.h -applets/usage: .config $(srctree)/applets/usage_compressed +applets/usage: .config $(srctree)/applets/usage_compressed + +quiet_cmd_gen_usage_compressed = GEN include/usage_compressed.h + cmd_gen_usage_compressed = $(srctree)/applets/usage_compressed include/usage_compressed.h applets include/usage_compressed.h: applets/usage $(srctree)/applets/usage_compressed $(call cmd,gen_usage_compressed) -# Two-stage file creation, to avoid having target file still created -# in case applet_tables fails +quiet_cmd_gen_applet_tables = GEN include/applet_tables.h + cmd_gen_applet_tables = applets/applet_tables include/applet_tables.h + include/applet_tables.h: applets/applet_tables - applets/applet_tables >include/applet_tables.h.tmp - mv include/applet_tables.h.tmp include/applet_tables.h + $(call cmd,gen_applet_tables) diff --git a/applets/applet_tables.c b/applets/applet_tables.c index b5df740..9f42ebf 100644 --- a/applets/applet_tables.c +++ b/applets/applet_tables.c @@ -50,45 +50,66 @@ int main(int argc, char **argv) qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name); - /* Keep in sync with include/busybox.h! */ - - puts("const char applet_names[] ALIGN1 ="); ofs = 0; - i = 0; for (i = 0; i < NUM_APPLETS; i++) { offset[i] = ofs; ofs += strlen(applets[i].name) + 1; + } + /* We reuse 4 high-order bits of offset array for other purposes, + * so if they are indeed needed, refuse to proceed */ + if (ofs > 0xfff) + return 1; + if (!argv[1]) + return 1; + + i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666); + if (i < 0) + return 1; + dup2(i, 1); + + /* Keep in sync with include/busybox.h! */ + + puts("/* This is a generated file, don't edit */"); + + puts("const char applet_names[] ALIGN1 ="); + for (i = 0; i < NUM_APPLETS; i++) { printf("\"%s\" \"\\0\"\n", applets[i].name); } puts(";"); - puts("int (*const applet_mains[])(int argc, char **argv) = {"); + puts("int (*const applet_main[])(int argc, char **argv) = {"); for (i = 0; i < NUM_APPLETS; i++) { printf("%s_main,\n", applets[i].main); } puts("};"); -#if ENABLE_FEATURE_INSTALLER || ENABLE_FEATURE_PREFER_APPLETS - puts("const uint32_t applet_nameofs[] = {"); -#else puts("const uint16_t applet_nameofs[] ALIGN2 = {"); -#endif for (i = 0; i < NUM_APPLETS; i++) { - printf("0x%08x,\n", + printf("0x%04x,\n", offset[i] +#if ENABLE_FEATURE_PREFER_APPLETS + + (applets[i].nofork << 12) + + (applets[i].noexec << 13) +#endif #if ENABLE_FEATURE_SUID + (applets[i].need_suid << 14) /* 2 bits */ #endif -#if ENABLE_FEATURE_INSTALLER - + (applets[i].install_loc << 16) /* 3 bits */ -#endif -#if ENABLE_FEATURE_PREFER_APPLETS - + (applets[i].nofork << 19) - + (applets[i].noexec << 20) -#endif ); } puts("};"); +#if ENABLE_FEATURE_INSTALLER + puts("const uint8_t applet_install_loc[] ALIGN1 = {"); + i = 0; + while (i < NUM_APPLETS) { + int v = applets[i].install_loc; /* 3 bits */ + if (++i < NUM_APPLETS) + v |= applets[i].install_loc << 4; /* 3 bits */ + printf("0x%02x,\n", v); + i++; + } + puts("};"); +#endif + return 0; } diff --git a/include/busybox.h b/include/busybox.h index f99901a..ec6953e 100644 --- a/include/busybox.h +++ b/include/busybox.h @@ -28,28 +28,31 @@ typedef enum bb_suid_t { /* Defined in appletlib.c (by including generated applet_tables.h) */ /* Keep in sync with applets/applet_tables.c! */ extern const char applet_names[]; -extern int (*const applet_mains[])(int argc, char **argv); +extern int (*const applet_main[])(int argc, char **argv); +extern const uint16_t applet_nameofs[]; +extern const uint8_t applet_install_loc[]; -#if ENABLE_FEATURE_INSTALLER || ENABLE_FEATURE_PREFER_APPLETS -extern const uint32_t applet_nameofs[]; +#if ENABLE_FEATURE_SUID || ENABLE_FEATURE_PREFER_APPLETS +#define APPLET_NAME(i) (applet_names + (applet_nameofs[i] & 0x0fff)) #else -extern const uint16_t applet_nameofs[]; +#define APPLET_NAME(i) (applet_names + applet_nameofs[i]) +#endif + +#if ENABLE_FEATURE_PREFER_APPLETS +#define APPLET_IS_NOFORK(i) (applet_nameofs[i] & (1 << 12)) +#define APPLET_IS_NOEXEC(i) (applet_nameofs[i] & (1 << 13)) #endif #if ENABLE_FEATURE_SUID -#define APPLET_NAME(i) (applet_names + (applet_nameofs[i] & 0x3fff)) #define APPLET_SUID(i) ((applet_nameofs[i] >> 14) & 0x3) -#else -#define APPLET_NAME(i) (applet_names + (applet_nameofs[i] & 0xffff)) #endif #if ENABLE_FEATURE_INSTALLER -#define APPLET_INSTALL_LOC(i) ((applet_nameofs[i] >> 16) & 0x7) -#endif - -#if ENABLE_FEATURE_PREFER_APPLETS -#define APPLET_IS_NOFORK(i) (applet_nameofs[i] & (1 << 19)) -#define APPLET_IS_NOEXEC(i) (applet_nameofs[i] & (1 << 20)) +#define APPLET_INSTALL_LOC(i) ({ \ + unsigned v = (i); \ + if (v & 1) v = applet_install_loc[v/2] >> 4; \ + else v = applet_install_loc[v/2] & 0xf; \ + v; }) #endif diff --git a/libbb/appletlib.c b/libbb/appletlib.c index dcf24f5..d5a2d06 100644 --- a/libbb/appletlib.c +++ b/libbb/appletlib.c @@ -101,19 +101,17 @@ void bb_show_usage(void) } +/* NB: any char pointer will work as well, not necessarily applet_names */ static int applet_name_compare(const void *name, const void *v) { int i = (const char *)v - applet_names; return strcmp(name, APPLET_NAME(i)); } - int find_applet_by_name(const char *name) { - const char *p; /* Do a binary search to find the applet entry given the name. */ - - /* NB: any char pointer will work as well, not necessarily applet_names */ - p = bsearch(name, applet_names, ARRAY_SIZE(applet_mains), 1, applet_name_compare); + const char *p; + p = bsearch(name, applet_names, ARRAY_SIZE(applet_main), 1, applet_name_compare); if (!p) return -1; return p - applet_names; @@ -543,10 +541,12 @@ static void install_links(const char *busybox, int use_symbolic_links) if (use_symbolic_links) lf = symlink; - for (i = 0; i < ARRAY_SIZE(applet_mains); i++) { + for (i = 0; i < ARRAY_SIZE(applet_main); i++) { fpc = concat_path_file( install_dir[APPLET_INSTALL_LOC(i)], APPLET_NAME(i)); + // debug: bb_error_msg("%slinking %s to busybox", + // use_symbolic_links ? "sym" : "", fpc); rc = lf(busybox, fpc); if (rc != 0 && errno != EEXIST) { bb_simple_perror_msg(fpc); @@ -644,7 +644,7 @@ void run_applet_no_and_exit(int applet_no, char **argv) bb_show_usage(); if (ENABLE_FEATURE_SUID) check_suid(applet_no); - exit(applet_mains[applet_no](argc, argv)); + exit(applet_main[applet_no](argc, argv)); } void run_applet_and_exit(const char *name, char **argv) diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c index 1d6817e..d6e233a 100644 --- a/libbb/vfork_daemon_rexec.c +++ b/libbb/vfork_daemon_rexec.c @@ -143,7 +143,7 @@ int run_nofork_applet_prime(struct nofork_save_area *old, int applet_no, char ** char *tmp_argv[argc+1]; memcpy(tmp_argv, argv, (argc+1) * sizeof(tmp_argv[0])); /* Finally we can call NOFORK applet's main() */ - rc = applet_mains[applet_no](argc, tmp_argv); + rc = applet_main[applet_no](argc, tmp_argv); } else { /* xfunc died in NOFORK applet */ /* in case they meant to return 0... */ if (rc == -2222) |