diff options
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 50 |
1 files changed, 42 insertions, 8 deletions
@@ -50,6 +50,7 @@ #include <gnu/lib-names.h> #include <dl-tunables.h> #include <get-dynamic-info.h> +#include <dl-execve.h> #include <assert.h> @@ -1106,6 +1107,45 @@ load_audit_modules (struct link_map *main_map, struct audit_list *audit_list) } } +/* Check if the executable is not actualy dynamically linked, and + invoke it directly in that case. */ +static void +rtld_chain_load (struct link_map *main_map, char *argv0) +{ + /* The dynamic loader run against itself. */ + const char *rtld_soname + = ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) + + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val); + if (main_map->l_info[DT_SONAME] != NULL + && strcmp (rtld_soname, + ((const char *) D_PTR (main_map, l_info[DT_STRTAB]) + + main_map->l_info[DT_SONAME]->d_un.d_val)) == 0) + _dl_fatal_printf ("%s: loader cannot load itself\n", rtld_soname); + + /* With DT_NEEDED dependencies, the executable is dynamically + linked. */ + if (__glibc_unlikely (main_map->l_info[DT_NEEDED] != NULL)) + return; + + /* If the executable has program interpreter, it is dynamically + linked. */ + for (size_t i = 0; i < main_map->l_phnum; ++i) + if (main_map->l_phdr[i].p_type == PT_INTERP) + return; + + const char *pathname = _dl_argv[0]; + if (argv0 != NULL) + _dl_argv[0] = argv0; + int errcode = __rtld_execve (pathname, _dl_argv, _environ); + const char *errname = strerrorname_np (errcode); + if (errname != NULL) + _dl_fatal_printf("%s: cannot execute %s: %s\n", + rtld_soname, pathname, errname); + else + _dl_fatal_printf("%s: cannot execute %s: %d\n", + rtld_soname, pathname, errno); +} + static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, @@ -1374,14 +1414,8 @@ dl_main (const ElfW(Phdr) *phdr, /* Now the map for the main executable is available. */ main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; - if (__glibc_likely (state.mode == rtld_mode_normal) - && GL(dl_rtld_map).l_info[DT_SONAME] != NULL - && main_map->l_info[DT_SONAME] != NULL - && strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB]) - + GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val, - (const char *) D_PTR (main_map, l_info[DT_STRTAB]) - + main_map->l_info[DT_SONAME]->d_un.d_val) == 0) - _dl_fatal_printf ("loader cannot load itself\n"); + if (__glibc_likely (state.mode == rtld_mode_normal)) + rtld_chain_load (main_map, argv0); phdr = main_map->l_phdr; phnum = main_map->l_phnum; |