diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/dl-load.c | 9 | ||||
| -rw-r--r-- | elf/dynamic-link.h | 91 | ||||
| -rw-r--r-- | elf/link.h | 4 | ||||
| -rw-r--r-- | elf/rtld.c | 18 |
4 files changed, 84 insertions, 38 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c index 81c1d8b..e961cb0 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -848,6 +848,11 @@ _dl_map_object_from_fd (char *name, int fd, char *realname, __mprotect ((caddr_t) (l->l_addr + c->mapend), loadcmds[nloadcmds - 1].allocend - c->mapend, 0); + + /* Remember which part of the address space this object uses. */ + l->l_map_start = c->mapstart + l->l_addr; + l->l_map_end = l->l_map_start + maplength; + goto postmap; } else @@ -857,6 +862,10 @@ _dl_map_object_from_fd (char *name, int fd, char *realname, ELF_FIXED_ADDRESS (loader, c->mapstart); } + /* Remember which part of the address space this object uses. */ + l->l_map_start = c->mapstart + l->l_addr; + l->l_map_end = l->l_map_start + maplength; + while (c < &loadcmds[nloadcmds]) { if (c->mapend > c->mapstart) diff --git a/elf/dynamic-link.h b/elf/dynamic-link.h index 9d7ae3d..9e2ca03 100644 --- a/elf/dynamic-link.h +++ b/elf/dynamic-link.h @@ -83,60 +83,75 @@ elf_get_dynamic_info (ElfW(Dyn) *dyn, #ifdef ELF_MACHINE_PLTREL_OVERLAP #define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, lazy) \ do { \ - ElfW(Addr) r_addr, r_size, p_addr, p_size; \ + struct { ElfW(Addr) start, size; int lazy; } ranges[3]; \ + int ranges_index; \ + \ + ranges[0].lazy = ranges[2].lazy = 0; \ + ranges[1].lazy = 1; \ + ranges[0].size = ranges[1].size = ranges[2].size = 0; \ + \ if ((map)->l_info[DT_##RELOC]) \ { \ - r_addr = (map)->l_info[DT_##RELOC]->d_un.d_ptr; \ - r_size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \ - if ((map)->l_info[DT_PLTREL] && \ - (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \ - { \ - p_addr = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \ - p_size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ - if (r_addr <= p_addr && r_addr+r_size > p_addr) \ - { \ - ElfW(Addr) r2_addr, r2_size; \ - r2_addr = p_addr + p_size; \ - if (r2_addr < r_addr + r_size) \ - { \ - r2_size = r_addr + r_size - r2_addr; \ - elf_dynamic_do_##reloc ((map), r2_addr, r2_size, 0); \ - } \ - r_size = p_addr - r_addr; \ - } \ - } \ - \ - elf_dynamic_do_##reloc ((map), r_addr, r_size, 0); \ - if (p_addr) \ - elf_dynamic_do_##reloc ((map), p_addr, p_size, (lazy)); \ + ranges[0].start = (map)->l_info[DT_##RELOC]->d_un.d_ptr; \ + ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \ } \ - else if ((map)->l_info[DT_PLTREL] && \ - (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \ - { \ - p_addr = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \ - p_size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ \ - elf_dynamic_do_##reloc ((map), p_addr, p_size, (lazy)); \ + if ((lazy) \ + && (map)->l_info[DT_PLTREL] \ + && (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \ + { \ + ranges[1].start = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \ + ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ + ranges[2].start = ranges[1].start + ranges[1].size; \ + ranges[2].size = ranges[0].start + ranges[0].size - ranges[2].start; \ + ranges[0].size = ranges[1].start - ranges[0].start; \ } \ + \ + for (ranges_index = 0; ranges_index < 3; ++ranges_index) \ + elf_dynamic_do_##reloc ((map), \ + ranges[ranges_index].start, \ + ranges[ranges_index].size, \ + ranges[ranges_index].lazy); \ } while (0) #else #define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, lazy) \ do { \ + struct { ElfW(Addr) start, size; int lazy; } ranges[2]; \ + int ranges_index; \ + ranges[0].lazy = 0; \ + ranges[1].lazy = 1; \ + ranges[0].size = ranges[1].size = 0; \ + ranges[0].start = 0; \ + \ if ((map)->l_info[DT_##RELOC]) \ { \ - ElfW(Addr) r_addr, r_size; \ - r_addr = (map)->l_info[DT_##RELOC]->d_un.d_ptr; \ - r_size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \ - elf_dynamic_do_##reloc ((map), r_addr, r_size, 0); \ + ranges[0].start = (map)->l_info[DT_##RELOC]->d_un.d_ptr; \ + ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \ } \ if ((map)->l_info[DT_PLTREL] && \ (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC) \ { \ - ElfW(Addr) p_addr, p_size; \ - p_addr = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \ - p_size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ - elf_dynamic_do_##reloc ((map), p_addr, p_size, (lazy)); \ + ElfW(Addr) start = (map)->l_info[DT_JMPREL]->d_un.d_ptr; \ + \ + if (lazy \ + /* This test does not only detect whether the relocation \ + sections are in the right order, it also checks whether \ + there is a DT_REL/DT_RELA section. */ \ + || ranges[0].start + ranges[0].size != start) \ + { \ + ranges[1].start = start; \ + ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ + } \ + else \ + /* Combine processing the sections. */ \ + ranges[0].size += (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \ } \ + \ + for (ranges_index = 0; ranges_index < 2; ++ranges_index) \ + elf_dynamic_do_##reloc ((map), \ + ranges[ranges_index].start, \ + ranges[ranges_index].size, \ + ranges[ranges_index].lazy); \ } while (0) #endif @@ -164,6 +164,10 @@ struct link_map /* String specifying the path where this object was found. */ const char *l_origin; + + /* Start and finish of memory map for this object. l_map_start + need not be the same as l_addr. */ + ElfW(Addr) l_map_start, l_map_end; }; #endif /* link.h */ @@ -165,6 +165,10 @@ _dl_start (void *arg) _dl_rtld_map.l_info[DT_RPATH]->d_un.d_val); } +/* Don't bother trying to work out how ld.so is mapped in memory. */ + _dl_rtld_map.l_map_start = ~0; + _dl_rtld_map.l_map_end = ~0; + /* Call the OS-dependent function to set up life so we can do things like file access. It will call `dl_main' (below) to do all the real work of the dynamic linker, and then unwind our frame and run the user @@ -432,6 +436,11 @@ of this helper program; chances are you did not intend to run this program.\n\ information for the program. */ } + /* It is not safe to load stuff after the main program. */ + main_map->l_map_end = ~0; + /* Perhaps the executable has no PT_LOAD header entries at all. */ + main_map->l_map_start = ~0; + /* Scan the program header table for the dynamic section. */ for (ph = phdr; ph < &phdr[phent]; ++ph) switch (ph->p_type) @@ -474,6 +483,15 @@ of this helper program; chances are you did not intend to run this program.\n\ has_interp = 1; break; + case PT_LOAD: + /* Remember where the main program starts in memory. */ + { + ElfW(Addr) mapstart; + mapstart = main_map->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); + if (main_map->l_map_start > mapstart) + main_map->l_map_start = mapstart; + } + break; } if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) { |