diff options
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/dl-machine.h | 30 |
2 files changed, 32 insertions, 5 deletions
@@ -1,3 +1,10 @@ +2015-03-26 Alan Modra <amodra@gmail.com> + + * sysdeps/powerpc/powerpc64/dl-machine.h (elf_machine_fixup_plt): + Don't segfault if ifunc resolver returns a NULL. Do set plt to + zero for undefined weak. + (elf_machine_plt_conflict): Similarly. + 2015-03-25 Joseph Myers <joseph@codesourcery.com> * math/auto-libm-test-in: Add more tests of acosh, asinh and diff --git a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h index 55ac73624b..0576781909 100644 --- a/sysdeps/powerpc/powerpc64/dl-machine.h +++ b/sysdeps/powerpc/powerpc64/dl-machine.h @@ -472,19 +472,32 @@ elf_machine_fixup_plt (struct link_map *map, lookup_t sym_map, Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr; Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr; Elf64_Addr offset = 0; + Elf64_FuncDesc zero_fd = {0, 0, 0}; PPC_DCBT (&plt->fd_aux); PPC_DCBT (&plt->fd_func); - PPC_DCBT (&rel->fd_aux); - PPC_DCBT (&rel->fd_func); - /* If sym_map is NULL, it's a weak undefined sym; Leave the plt zero. */ + /* If sym_map is NULL, it's a weak undefined sym; Set the plt to + zero. finaladdr should be zero already in this case, but guard + against invalid plt relocations with non-zero addends. */ if (sym_map == NULL) - return 0; + finaladdr = 0; + + /* Don't die here if finaladdr is zero, die if this plt entry is + actually called. Makes a difference when LD_BIND_NOW=1. + finaladdr may be zero for a weak undefined symbol, or when an + ifunc resolver returns zero. */ + if (finaladdr == 0) + rel = &zero_fd; + else + { + PPC_DCBT (&rel->fd_aux); + PPC_DCBT (&rel->fd_func); + } /* If the opd entry is not yet relocated (because it's from a shared object that hasn't been processed yet), then manually reloc it. */ - if (map != sym_map && !sym_map->l_relocated + if (finaladdr != 0 && map != sym_map && !sym_map->l_relocated #if !defined RTLD_BOOTSTRAP && defined SHARED /* Bootstrap map doesn't have l_relocated set for it. */ && sym_map != &GL(dl_rtld_map) @@ -522,6 +535,13 @@ elf_machine_plt_conflict (struct link_map *map, lookup_t sym_map, #if _CALL_ELF != 2 Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr; Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr; + Elf64_FuncDesc zero_fd = {0, 0, 0}; + + if (sym_map == NULL) + finaladdr = 0; + + if (finaladdr == 0) + rel = &zero_fd; plt->fd_func = rel->fd_func; plt->fd_aux = rel->fd_aux; |