diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/dl-support.c | 4 | ||||
| -rw-r--r-- | elf/rtld.c | 42 |
2 files changed, 44 insertions, 2 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index 1e547d3..2ff3d2f 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -127,8 +127,8 @@ size_t _dl_phnum; #ifdef NEED_DL_SYSINFO /* Needed for improved syscall handling on at least x86/Linux. */ uintptr_t _dl_sysinfo = DL_SYSINFO_DEFAULT; -/* Address of the unwind info for the vsyscall page. */ -uintptr_t _dl_sysinfo_eh_frame; +/* Address of the ELF headers in the vsyscall page. */ +const ElfW(Ehdr) *_dl_sysinfo_dso; #endif /* During the program run we must not modify the global data of @@ -1069,6 +1069,48 @@ of this helper program; chances are you did not intend to run this program.\n\ assert (i == npreloads); } +#ifdef NEED_DL_SYSINFO + if (GL(dl_sysinfo_dso) != NULL) + { + /* We have a prelinked DSO preloaded by the system. */ + GL(dl_sysinfo) = GL(dl_sysinfo_dso)->e_entry; + + /* Do an abridged version of the work _dl_map_object_from_fd would do + to map in the object. It's already mapped and prelinked (and + better be, since it's read-only and so we couldn't relocate it). + We just want our data structures to describe it as if we had just + mapped and relocated it normally. */ + struct link_map *l = _dl_new_object ((char *) "", "", lt_library, NULL); + if (__builtin_expect (l != NULL, 1)) + { + l->l_phdr = ((const void *) GL(dl_sysinfo_dso) + + GL(dl_sysinfo_dso)->e_phoff); + l->l_phnum = GL(dl_sysinfo_dso)->e_phnum; + for (uint_fast16_t i = 0; i < l->l_phnum; ++i) + { + const ElfW(Phdr) *const ph = &l->l_phdr[i]; + if (ph->p_type == PT_DYNAMIC) + { + l->l_ld = (void *) ph->p_vaddr; + l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn)); + break; + } + if (ph->p_type == PT_LOAD) + assert ((void *) ph->p_vaddr == GL(dl_sysinfo_dso)); + } + elf_get_dynamic_info (l); + _dl_setup_hash (l); + l->l_relocated = 1; + + /* Now that we have the info handy, use the DSO image's soname + so this object can be looked up by name. */ + if (l->l_info[DT_SONAME] != NULL) + l->l_libname->name = ((char *) D_PTR (l, l_info[DT_STRTAB]) + + l->l_info[DT_SONAME]->d_un.d_val); + } + } +#endif + /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD specified some libraries to load, these are inserted before the actual dependencies in the executable's searchlist for symbol resolution. */ |