diff options
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 56 |
1 files changed, 48 insertions, 8 deletions
diff --git a/elf/rtld.c b/elf/rtld.c index c0609e4310..2eeec981a5 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -1151,6 +1151,7 @@ dl_main (const ElfW(Phdr) *phdr, _dl_starting_up = 1; #endif + const char *ld_so_name = _dl_argv[0]; if (*user_entry == (ElfW(Addr)) ENTRY_POINT) { /* Ho ho. We are not the program interpreter! We are the program @@ -1178,8 +1179,12 @@ dl_main (const ElfW(Phdr) *phdr, while (_dl_argc > 1) if (! strcmp (_dl_argv[1], "--list")) { - state.mode = rtld_mode_list; - GLRO(dl_lazy) = -1; /* This means do no dependency analysis. */ + if (state.mode != rtld_mode_help) + { + state.mode = rtld_mode_list; + /* This means do no dependency analysis. */ + GLRO(dl_lazy) = -1; + } ++_dl_skip_args; --_dl_argc; @@ -1187,7 +1192,8 @@ dl_main (const ElfW(Phdr) *phdr, } else if (! strcmp (_dl_argv[1], "--verify")) { - state.mode = rtld_mode_verify; + if (state.mode != rtld_mode_help) + state.mode = rtld_mode_verify; ++_dl_skip_args; --_dl_argc; @@ -1242,13 +1248,34 @@ dl_main (const ElfW(Phdr) *phdr, _dl_argc -= 2; _dl_argv += 2; } + else if (strcmp (_dl_argv[1], "--help") == 0) + { + state.mode = rtld_mode_help; + --_dl_argc; + ++_dl_argv; + } + else if (_dl_argv[1][0] == '-' && _dl_argv[1][1] == '-') + { + if (_dl_argv[1][1] == '\0') + /* End of option list. */ + break; + else + /* Unrecognized option. */ + _dl_usage (ld_so_name, _dl_argv[1]); + } else break; /* If we have no further argument the program was called incorrectly. Grant the user some education. */ if (_dl_argc < 2) - _dl_usage (); + { + if (state.mode == rtld_mode_help) + /* --help without an executable is not an error. */ + _dl_help (ld_so_name, &state); + else + _dl_usage (ld_so_name, NULL); + } ++_dl_skip_args; --_dl_argc; @@ -1273,7 +1300,8 @@ dl_main (const ElfW(Phdr) *phdr, break; } - if (__glibc_unlikely (state.mode == rtld_mode_verify)) + if (__glibc_unlikely (state.mode == rtld_mode_verify + || state.mode == rtld_mode_help)) { const char *objname; const char *err_str = NULL; @@ -1286,9 +1314,16 @@ dl_main (const ElfW(Phdr) *phdr, (void) _dl_catch_error (&objname, &err_str, &malloced, map_doit, &args); if (__glibc_unlikely (err_str != NULL)) - /* We don't free the returned string, the programs stops - anyway. */ - _exit (EXIT_FAILURE); + { + /* We don't free the returned string, the programs stops + anyway. */ + if (state.mode == rtld_mode_help) + /* Mask the failure to load the main object. The help + message contains less information in this case. */ + _dl_help (ld_so_name, &state); + else + _exit (EXIT_FAILURE); + } } else { @@ -1647,6 +1682,11 @@ dl_main (const ElfW(Phdr) *phdr, audit_list_add_dynamic_tag (&state.audit_list, main_map, DT_AUDIT); audit_list_add_dynamic_tag (&state.audit_list, main_map, DT_DEPAUDIT); + /* At this point, all data has been obtained that is included in the + --help output. */ + if (__glibc_unlikely (state.mode == rtld_mode_help)) + _dl_help (ld_so_name, &state); + /* If we have auditing DSOs to load, do it now. */ bool need_security_init = true; if (state.audit_list.length > 0) |