diff options
| -rw-r--r-- | libexec/rtld-elf/rtld.c | 36 | ||||
| -rw-r--r-- | libexec/rtld-elf/rtld.h | 2 |
2 files changed, 38 insertions, 0 deletions
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c index 6c304f98253a..d598bb044f8e 100644 --- a/libexec/rtld-elf/rtld.c +++ b/libexec/rtld-elf/rtld.c @@ -1255,6 +1255,18 @@ digest_dynamic1(Obj_Entry *obj, int early, const Elf_Dyn **dyn_rpath, assert(dynp->d_un.d_val == sizeof(Elf_Rela)); break; + case DT_RELR: + obj->relr = (const Elf_Relr *)(obj->relocbase + dynp->d_un.d_ptr); + break; + + case DT_RELRSZ: + obj->relrsize = dynp->d_un.d_val; + break; + + case DT_RELRENT: + assert(dynp->d_un.d_val == sizeof(Elf_Relr)); + break; + case DT_PLTREL: plttype = dynp->d_un.d_val; assert(dynp->d_un.d_val == DT_REL || plttype == DT_RELA); @@ -3148,6 +3160,29 @@ reloc_textrel_prot(Obj_Entry *obj, bool before) return (0); } +/* Process RELR relative relocations. */ +static void +reloc_relr(Obj_Entry *obj) +{ + const Elf_Relr *relr, *relrlim; + Elf_Addr *where; + + relrlim = (const Elf_Relr *)((const char *)obj->relr + obj->relrsize); + for (relr = obj->relr; relr < relrlim; relr++) { + Elf_Relr entry = *relr; + + if ((entry & 1) == 0) { + where = (Elf_Addr *)(obj->relocbase + entry); + *where++ += (Elf_Addr)obj->relocbase; + } else { + for (long i = 0; (entry >>= 1) != 0; i++) + if ((entry & 1) != 0) + where[i] += (Elf_Addr)obj->relocbase; + where += CHAR_BIT * sizeof(Elf_Relr) - 1; + } + } +} + /* * Relocate single object. * Returns 0 on success, or -1 on failure. @@ -3174,6 +3209,7 @@ relocate_object(Obj_Entry *obj, bool bind_now, Obj_Entry *rtldobj, /* Process the non-PLT non-IFUNC relocations. */ if (reloc_non_plt(obj, rtldobj, flags, lockstate)) return (-1); + reloc_relr(obj); /* Re-protected the text segment. */ if (obj->textrel && reloc_textrel_prot(obj, false) != 0) diff --git a/libexec/rtld-elf/rtld.h b/libexec/rtld-elf/rtld.h index 060b83b2cdad..b216e80115bc 100644 --- a/libexec/rtld-elf/rtld.h +++ b/libexec/rtld-elf/rtld.h @@ -174,6 +174,8 @@ typedef struct Struct_Obj_Entry { unsigned long relsize; /* Size in bytes of relocation info */ const Elf_Rela *rela; /* Relocation entries with addend */ unsigned long relasize; /* Size in bytes of addend relocation info */ + const Elf_Relr *relr; /* RELR relocation entries */ + unsigned long relrsize; /* Size in bytes of RELR relocations */ const Elf_Rel *pltrel; /* PLT relocation entries */ unsigned long pltrelsize; /* Size in bytes of PLT relocation info */ const Elf_Rela *pltrela; /* PLT relocation entries with addend */ |