Merge "Don't allow text relocations on 64-bit."
This commit is contained in:
Elliott Hughes
Gerrit Code Review
commit
486d99f050
4 changed files with 65 additions and 27 deletions
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@ -1,4 +1,4 @@
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/* $NetBSD: exec_elf.h,v 1.126 2012/08/05 01:43:59 matt Exp $ */
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/* $NetBSD: exec_elf.h,v 1.129 2013/09/10 16:24:02 matt Exp $ */
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/*-
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* Copyright (c) 1994 The NetBSD Foundation, Inc.
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@ -429,6 +429,13 @@ typedef struct {
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#define SHT_HIOS 0x6fffffff
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#define SHT_LOPROC 0x70000000 /* Processor-specific range */
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#define SHT_AMD64_UNWIND 0x70000001 /* unwind information */
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#define SHT_ARM_EXIDX 0x70000001 /* exception index table */
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#define SHT_ARM_PREEMPTMAP 0x70000002 /* BPABI DLL dynamic linking
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* pre-emption map */
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#define SHT_ARM_ATTRIBUTES 0x70000003 /* Object file compatibility
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* attributes */
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#define SHT_ARM_DEBUGOVERLAY 0x70000004 /* See DBGOVL for details */
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#define SHT_ARM_OVERLAYSECTION 0x70000005
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#define SHT_HIPROC 0x7fffffff
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#define SHT_LOUSER 0x80000000 /* Application-specific range */
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#define SHT_HIUSER 0xffffffff
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@ -668,7 +675,12 @@ typedef struct {
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#define DT_FINI_ARRAY 26 /* Size, in bytes, of DT_INIT_ARRAY array */
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#define DT_INIT_ARRAYSZ 27 /* Address of termination function array */
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#define DT_FINI_ARRAYSZ 28 /* Size, in bytes, of DT_FINI_ARRAY array*/
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#define DT_NUM 29
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#define DT_RUNPATH 29 /* overrides DT_RPATH */
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#define DT_FLAGS 30 /* Encodes ORIGIN, SYMBOLIC, TEXTREL, BIND_NOW, STATIC_TLS */
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#define DT_ENCODING 31 /* ??? */
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#define DT_PREINIT_ARRAY 32 /* Address of pre-init function array */
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#define DT_PREINIT_ARRAYSZ 33 /* Size, in bytes, of DT_PREINIT_ARRAY array */
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#define DT_NUM 34
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#define DT_LOOS 0x60000000 /* Operating system specific range */
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#define DT_VERSYM 0x6ffffff0 /* Symbol versions */
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@ -802,7 +814,7 @@ typedef struct {
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* GNU-specific note type: Build ID generated by ld
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* name: GNU\0
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* desc:
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* word[0..4] SHA1 [default]
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* word[0..4] SHA1 [default]
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* or
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* word[0..3] md5 or uuid
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* descsz: 16 or 20
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@ -829,7 +841,7 @@ typedef struct {
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/* SuSE-specific note type: version
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* name: SuSE\0\0\0\0
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* namesz: 8
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* desc:
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* desc:
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* word[0] = VVTTMMmm
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*
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* V = version of following data
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@ -848,7 +860,7 @@ typedef struct {
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/* NetBSD-specific note type: Emulation name.
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* name: NetBSD\0\0
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* namesz: 8
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* desc:
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* desc:
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* word[0]: MMmmrrpp00
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*
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* M = major version
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@ -864,7 +876,7 @@ typedef struct {
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/* NetBSD-specific note name */
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#define ELF_NOTE_NETBSD_NAME "NetBSD\0\0"
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/* NetBSD-specific note type: Checksum.
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/* NetBSD-specific note type: Checksum.
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* There should be 1 NOTE per PT_LOAD section.
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* name: ???
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* namesz: ???
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@ -953,6 +965,20 @@ struct netbsd_elfcore_procinfo {
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int32_t cpi_siglwp; /* LWP target of killing signal */
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};
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/*
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* NetBSD-specific note type: MACHINE_ARCH.
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* There should be 1 NOTE per executable.
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* name: NetBSD\0
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* namesz: 7
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* desc: string
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* descsz: variable
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*/
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#define ELF_NOTE_TYPE_MARCH_TAG 5
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/* NetBSD-specific note name and description sizes */
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#define ELF_NOTE_MARCH_NAMESZ ELF_NOTE_NETBSD_NAMESZ
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/* NetBSD-specific note name */
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#define ELF_NOTE_MARCH_NAME ELF_NOTE_NETBSD_NAME
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#if !defined(ELFSIZE) && defined(ARCH_ELFSIZE)
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#define ELFSIZE ARCH_ELFSIZE
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#endif
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@ -1067,7 +1093,7 @@ typedef struct {
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#define SYMINFO_NUM 2
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/*
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* These constants are used for Elf32_Verdef struct's version number.
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* These constants are used for Elf32_Verdef struct's version number.
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*/
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#define VER_DEF_NONE 0
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#define VER_DEF_CURRENT 1
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@ -1078,7 +1104,7 @@ typedef struct {
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#define VER_DEF_IDX(x) VER_NDX(x)
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/*
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* These constants are used for Elf32_Verdef struct's vd_flags.
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* These constants are used for Elf32_Verdef struct's vd_flags.
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*/
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#define VER_FLG_BASE 0x1
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#define VER_FLG_WEAK 0x2
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@ -1091,7 +1117,7 @@ typedef struct {
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#define VER_NDX_GIVEN 2
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/*
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* These constants are used for Elf32_Verneed struct's version number.
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* These constants are used for Elf32_Verneed struct's version number.
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*/
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#define VER_NEED_NONE 0
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#define VER_NEED_CURRENT 1
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@ -295,6 +295,8 @@ soinfo libdl_info = {
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{ .l_addr = 0, .l_name = 0, .l_ld = 0, .l_next = 0, .l_prev = 0, },
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.constructors_called = false,
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.load_bias = 0,
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#if !defined(__LP64__)
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.has_text_relocations = false,
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#endif
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.has_DT_SYMBOLIC = true,
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};
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@ -1548,25 +1548,32 @@ static bool soinfo_link_image(soinfo* si) {
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si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(Elf_Addr);
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break;
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case DT_TEXTREL:
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#if defined(__LP64__)
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DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name);
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return false;
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#else
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si->has_text_relocations = true;
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break;
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#endif
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case DT_SYMBOLIC:
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si->has_DT_SYMBOLIC = true;
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break;
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case DT_NEEDED:
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++needed_count;
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break;
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#if defined DT_FLAGS
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// TODO: why is DT_FLAGS not defined?
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case DT_FLAGS:
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if (d->d_un.d_val & DF_TEXTREL) {
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#if defined(__LP64__)
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DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name);
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return false;
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#else
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si->has_text_relocations = true;
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#endif
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}
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if (d->d_un.d_val & DF_SYMBOLIC) {
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si->has_DT_SYMBOLIC = true;
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}
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break;
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#endif
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#if defined(__mips__)
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case DT_STRSZ:
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case DT_SYMENT:
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@ -1661,12 +1668,10 @@ static bool soinfo_link_image(soinfo* si) {
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}
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*pneeded = NULL;
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#if !defined(__LP64__)
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if (si->has_text_relocations) {
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/* Unprotect the segments, i.e. make them writable, to allow
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* text relocations to work properly. We will later call
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* phdr_table_protect_segments() after all of them are applied
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* and all constructors are run.
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*/
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// Make segments writable to allow text relocations to work properly. We will later call
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// phdr_table_protect_segments() after all of them are applied and all constructors are run.
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DL_WARN("%s has text relocations. This is wasting memory and prevents "
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"security hardening. Please fix.", si->name);
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if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) {
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@ -1675,6 +1680,7 @@ static bool soinfo_link_image(soinfo* si) {
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return false;
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}
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}
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#endif
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#if defined(USE_RELA)
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if (si->plt_rela != NULL) {
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@ -1713,15 +1719,16 @@ static bool soinfo_link_image(soinfo* si) {
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si->flags |= FLAG_LINKED;
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DEBUG("[ finished linking %s ]", si->name);
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#if !defined(__LP64__)
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if (si->has_text_relocations) {
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/* All relocations are done, we can protect our segments back to
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* read-only. */
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// All relocations are done, we can protect our segments back to read-only.
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if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) {
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DL_ERR("can't protect segments for \"%s\": %s",
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si->name, strerror(errno));
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return false;
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}
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}
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#endif
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/* We can also turn on GNU RELRO protection */
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if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) {
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@ -183,7 +183,9 @@ struct soinfo {
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// value to get the corresponding address in the process' address space.
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Elf_Addr load_bias;
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#if !defined(__LP64__)
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bool has_text_relocations;
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#endif
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bool has_DT_SYMBOLIC;
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void CallConstructors();
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@ -195,15 +197,16 @@ struct soinfo {
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void CallFunction(const char* function_name, linker_function_t function);
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};
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extern soinfo libdl_info;
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// The possible DT_FLAGS bits are in
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// http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#dynamic_section
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// but not in the upstream NetBSD <sys/exec_elf.h> header file ours is based on.
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#define DF_ORIGIN 0x1
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#define DF_SYMBOLIC 0x2
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#define DF_TEXTREL 0x4
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#define DF_BIND_NOW 0x8
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#define DF_STATIC_TLS 0x10
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// These aren't defined in <sys/exec_elf.h>.
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#ifndef DT_PREINIT_ARRAY
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#define DT_PREINIT_ARRAY 32
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#endif
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#ifndef DT_PREINIT_ARRAYSZ
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#define DT_PREINIT_ARRAYSZ 33
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#endif
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extern soinfo libdl_info;
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void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path);
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soinfo* do_dlopen(const char* name, int flags);
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