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0.189-5 - Add elfutils-0.189-relr.patch

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This commit is contained in:
Mark Wielaard 2023-08-24 00:16:51 +02:00
parent 62b5826af2
commit 6258998871
2 changed files with 452 additions and 1 deletions
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elfutils-0.189-relr.patch Normal file
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@ -0,0 +1,446 @@
commit 6ba977ed6c7ac6e51350f2093ebe0b90ff89f90c
Author: Mark Wielaard <mark@klomp.org>
Date: Sun Jul 23 23:14:31 2023 +0200
libelf, readelf, elflint: Add RELR support
Handle RELR as defined here:
https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/YT2RrjpMAwAJ
Introduce new ELF_T_RELR Elf_Type and handle it for SHT_RELR. Check
various properties in elflint. Print RELR relocations in
readelf. Just the entries with -U. Just the addresses with -N. And
addresses pluse symbol/offsets by default.
* libebl/eblsectiontypename.c (ebl_section_type_name): Add RELR
to knownstype.
* libelf/elf32_updatenull.c (updatenull_wrlock): Handle
sh_entsize for SHT_RELR.
* libelf/gelf.h (Gelf_Relr): New typedef for Elf64_Relr.
* libelf/gelf_fsize.c (__libelf_type_sizes): Add ELF_T_RELR.
* libelf/gelf_xlate.c (__elf_xfctstom): Likewise.
* libelf/gelf_xlate.h: Add RELR as FUNDAMENTAL.
* libelf/libelf.h (Elf_Type): Add ELF_T_RELR.
* libelf/libelfP.h: Define ELF32_FSZ_RELR and ELF64_FSZ_RELR.
* src/elflint.c (check_reloc_shdr): Check she_entsize for
ELF_T_RELR.
(check_relr): New function.
(check_dynamic): Handle DT_RELR.
(special_sections): Add SHT_RELR.
(check_sections): Call check_relr.
* src/readelf.c (print_relocs): Also accept a Dwfl_Module.
(handle_relocs_relr): New function.
(print_dwarf_addr): Make static and declare early.
(process_elf_file): Pass dwflmod to print_relocs.
(handle_dynamic): Handle DT_RELRSZ and DTRELRENT.
Signed-off-by: Mark Wielaard <mark@klomp.org>
diff --git a/libebl/eblsectiontypename.c b/libebl/eblsectiontypename.c
index 2008b95a..ade25d4a 100644
--- a/libebl/eblsectiontypename.c
+++ b/libebl/eblsectiontypename.c
@@ -61,7 +61,8 @@ ebl_section_type_name (Ebl *ebl, int section, char *buf, size_t len)
KNOWNSTYPE (FINI_ARRAY),
KNOWNSTYPE (PREINIT_ARRAY),
KNOWNSTYPE (GROUP),
- KNOWNSTYPE (SYMTAB_SHNDX)
+ KNOWNSTYPE (SYMTAB_SHNDX),
+ KNOWNSTYPE (RELR)
};
/* Handle standard names. */
diff --git a/libelf/elf32_updatenull.c b/libelf/elf32_updatenull.c
index 6c06e5e4..c5d26b00 100644
--- a/libelf/elf32_updatenull.c
+++ b/libelf/elf32_updatenull.c
@@ -256,6 +256,9 @@ __elfw2(LIBELFBITS,updatenull_wrlock) (Elf *elf, int *change_bop, size_t shnum)
case SHT_SUNW_syminfo:
sh_entsize = elf_typesize (LIBELFBITS, ELF_T_SYMINFO, 1);
break;
+ case SHT_RELR:
+ sh_entsize = elf_typesize (LIBELFBITS, ELF_T_RELR, 1);
+ break;
default:
break;
}
diff --git a/libelf/gelf.h b/libelf/gelf.h
index 7a3c87aa..f032d7e1 100644
--- a/libelf/gelf.h
+++ b/libelf/gelf.h
@@ -82,6 +82,9 @@ typedef Elf64_Rel GElf_Rel;
/* Relocation table entry with addend (in section of type SHT_RELA). */
typedef Elf64_Rela GElf_Rela;
+/* Relative relocation entry (in section of type SHT_RELR). */
+typedef Elf64_Relr Gelf_Relr;
+
/* Program segment header. */
typedef Elf64_Phdr GElf_Phdr;
diff --git a/libelf/gelf_fsize.c b/libelf/gelf_fsize.c
index 493d7916..63bcbae5 100644
--- a/libelf/gelf_fsize.c
+++ b/libelf/gelf_fsize.c
@@ -69,7 +69,8 @@ const size_t __libelf_type_sizes[ELFCLASSNUM - 1][ELF_T_NUM] =
[ELF_T_LIB] = sizeof (ElfW2(LIBELFBITS, Ext_Lib)), \
[ELF_T_AUXV] = sizeof (ElfW2(LIBELFBITS, Ext_auxv_t)), \
[ELF_T_CHDR] = sizeof (ElfW2(LIBELFBITS, Ext_Chdr)), \
- [ELF_T_GNUHASH] = ELFW2(LIBELFBITS, FSZ_WORD)
+ [ELF_T_GNUHASH] = ELFW2(LIBELFBITS, FSZ_WORD), \
+ [ELF_T_RELR] = ELFW2(LIBELFBITS, FSZ_RELR)
TYPE_SIZES (32)
},
[ELFCLASS64 - 1] = {
diff --git a/libelf/gelf_xlate.c b/libelf/gelf_xlate.c
index d8ad0634..749da1a1 100644
--- a/libelf/gelf_xlate.c
+++ b/libelf/gelf_xlate.c
@@ -204,7 +204,8 @@ const xfct_t __elf_xfctstom[ELFCLASSNUM - 1][ELF_T_NUM] =
[ELF_T_MOVE] = ElfW2(Bits, cvt_Move), \
[ELF_T_LIB] = ElfW2(Bits, cvt_Lib), \
[ELF_T_AUXV] = ElfW2(Bits, cvt_auxv_t), \
- [ELF_T_CHDR] = ElfW2(Bits, cvt_chdr)
+ [ELF_T_CHDR] = ElfW2(Bits, cvt_chdr), \
+ [ELF_T_RELR] = ElfW2(Bits, cvt_Relr)
define_xfcts (32),
[ELF_T_GNUHASH] = Elf32_cvt_Word
},
diff --git a/libelf/gelf_xlate.h b/libelf/gelf_xlate.h
index 3c0e4bf6..d5511c34 100644
--- a/libelf/gelf_xlate.h
+++ b/libelf/gelf_xlate.h
@@ -36,6 +36,7 @@ FUNDAMENTAL (WORD, Word, LIBELFBITS);
FUNDAMENTAL (SWORD, Sword, LIBELFBITS);
FUNDAMENTAL (XWORD, Xword, LIBELFBITS);
FUNDAMENTAL (SXWORD, Sxword, LIBELFBITS);
+FUNDAMENTAL (RELR, Relr, LIBELFBITS);
/* The structured types. */
TYPE (Ehdr, LIBELFBITS)
diff --git a/libelf/libelf.h b/libelf/libelf.h
index 2374a48a..2837db72 100644
--- a/libelf/libelf.h
+++ b/libelf/libelf.h
@@ -124,6 +124,7 @@ typedef enum
ELF_T_CHDR, /* Compressed, Elf32_Chdr, Elf64_Chdr, ... */
ELF_T_NHDR8, /* Special GNU Properties note. Same as Nhdr,
except padding. */
+ ELF_T_RELR, /* Relative relocation entry. */
/* Keep this the last entry. */
ELF_T_NUM
} Elf_Type;
diff --git a/libelf/libelfP.h b/libelf/libelfP.h
index d3c241e5..96476064 100644
--- a/libelf/libelfP.h
+++ b/libelf/libelfP.h
@@ -63,6 +63,7 @@
#define ELF32_FSZ_SWORD 4
#define ELF32_FSZ_XWORD 8
#define ELF32_FSZ_SXWORD 8
+#define ELF32_FSZ_RELR 4
/* Same for 64 bits objects. */
#define ELF64_FSZ_ADDR 8
@@ -72,6 +73,7 @@
#define ELF64_FSZ_SWORD 4
#define ELF64_FSZ_XWORD 8
#define ELF64_FSZ_SXWORD 8
+#define ELF64_FSZ_RELR 8
/* This is an extension of the ELF_F_* enumeration. The values here are
diff --git a/src/elflint.c b/src/elflint.c
index dd42dcb4..864de710 100644
--- a/src/elflint.c
+++ b/src/elflint.c
@@ -1,5 +1,6 @@
/* Pedantic checking of ELF files compliance with gABI/psABI spec.
Copyright (C) 2001-2015, 2017, 2018 Red Hat, Inc.
+ Copyright (C) 2023 Mark J. Wielaard <mark@klomp.org>
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2001.
@@ -1291,10 +1292,20 @@ section [%2d] '%s': no relocations for merge-able string sections possible\n"),
size_t sh_entsize = gelf_fsize (ebl->elf, reltype, 1, EV_CURRENT);
if (shdr->sh_entsize != sh_entsize)
- ERROR (_(reltype == ELF_T_RELA ? "\
-section [%2d] '%s': section entry size does not match ElfXX_Rela\n" : "\
-section [%2d] '%s': section entry size does not match ElfXX_Rel\n"),
- idx, section_name (ebl, idx));
+ {
+ if (reltype == ELF_T_RELA)
+ ERROR ("\
+section [%2d] '%s': section entry size does not match ElfXX_Rela\n",
+ idx, section_name (ebl, idx));
+ else if (reltype == ELF_T_REL)
+ ERROR ("\
+section [%2d] '%s': section entry size does not match ElfXX_Rel\n",
+ idx, section_name (ebl, idx));
+ else
+ ERROR ("\
+section [%2d] '%s': section entry size does not match ElfXX_Relr\n",
+ idx, section_name (ebl, idx));
+ }
/* In preparation of checking whether relocations are text
relocations or not we need to determine whether the file is
@@ -1590,6 +1601,32 @@ section [%2d] '%s': cannot get relocation %zu: %s\n"),
}
}
+static void
+check_relr (Ebl *ebl, GElf_Ehdr *ehdr, GElf_Shdr *shdr, int idx)
+{
+ Elf_Data *data = elf_getdata (elf_getscn (ebl->elf, idx), NULL);
+ if (data == NULL)
+ {
+ ERROR (_("section [%2d] '%s': cannot get section data\n"),
+ idx, section_name (ebl, idx));
+ return;
+ }
+
+ /* Check the fields of the section header. */
+ GElf_Shdr destshdr_mem;
+ GElf_Shdr *destshdr = NULL;
+ struct loaded_segment *loaded = NULL;
+ check_reloc_shdr (ebl, ehdr, shdr, idx, ELF_T_RELR, &destshdr,
+ &destshdr_mem, &loaded);
+
+ /* Just throw them away. */
+ while (loaded != NULL)
+ {
+ struct loaded_segment *old = loaded;
+ loaded = loaded->next;
+ free (old);
+ }
+}
/* Number of dynamic sections. */
static int ndynamic;
@@ -1780,6 +1817,7 @@ section [%2d] '%s': entry %zu: pointer does not match address of section [%2d] '
case DT_PLTGOT:
case DT_REL:
case DT_RELA:
+ case DT_RELR:
case DT_SYMBOLIC:
case DT_SYMTAB:
case DT_VERDEF:
@@ -3660,6 +3698,7 @@ static const struct
{ ".plt", 5, SHT_PROGBITS, unused, 0, 0 }, // XXX more tests
{ ".preinit_array", 15, SHT_PREINIT_ARRAY, exact, SHF_ALLOC | SHF_WRITE, 0 },
{ ".rela", 5, SHT_RELA, atleast, 0, SHF_ALLOC | SHF_INFO_LINK }, // XXX more tests
+ { ".relr", 5, SHT_RELR, atleast, 0, SHF_ALLOC }, // XXX more tests
{ ".rel", 4, SHT_REL, atleast, 0, SHF_ALLOC | SHF_INFO_LINK }, // XXX more tests
{ ".rodata", 8, SHT_PROGBITS, atleast, SHF_ALLOC, SHF_MERGE | SHF_STRINGS },
{ ".rodata1", 9, SHT_PROGBITS, atleast, SHF_ALLOC, SHF_MERGE | SHF_STRINGS },
@@ -4182,6 +4221,10 @@ section [%2zu] '%s': relocatable files cannot have dynamic symbol tables\n"),
check_rel (ebl, ehdr, shdr, cnt);
break;
+ case SHT_RELR:
+ check_relr (ebl, ehdr, shdr, cnt);
+ break;
+
case SHT_DYNAMIC:
check_dynamic (ebl, ehdr, shdr, cnt);
break;
diff --git a/src/readelf.c b/src/readelf.c
index eda0ce09..db31ad09 100644
--- a/src/readelf.c
+++ b/src/readelf.c
@@ -1,5 +1,6 @@
/* Print information from ELF file in human-readable form.
Copyright (C) 1999-2018 Red Hat, Inc.
+ Copyright (C) 2023 Mark J. Wielaard <mark@klomp.org>
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -302,11 +302,13 @@
static void print_phdr (Ebl *ebl, GElf_Ehdr *ehdr);
static void print_scngrp (Ebl *ebl);
static void print_dynamic (Ebl *ebl);
-static void print_relocs (Ebl *ebl, GElf_Ehdr *ehdr);
+static void print_relocs (Ebl *ebl, Dwfl_Module *mod, GElf_Ehdr *ehdr);
static void handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn,
GElf_Shdr *shdr);
static void handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn,
GElf_Shdr *shdr);
+static void handle_relocs_relr (Ebl *ebl, Dwfl_Module *mod, Elf_Scn *scn,
+ GElf_Shdr *shdr);
static bool print_symtab (Ebl *ebl, int type);
static void handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr);
static void print_verinfo (Ebl *ebl);
@@ -336,6 +339,8 @@ static void dump_data (Ebl *ebl);
static void dump_strings (Ebl *ebl);
static void print_strings (Ebl *ebl);
static void dump_archive_index (Elf *, const char *);
+static void print_dwarf_addr (Dwfl_Module *dwflmod, int address_size,
+ Dwarf_Addr address, Dwarf_Addr raw);
enum dyn_idx
{
@@ -1052,7 +1057,7 @@ process_elf_file (Dwfl_Module *dwflmod, int fd)
if (print_dynamic_table)
print_dynamic (ebl);
if (print_relocations)
- print_relocs (pure_ebl, ehdr);
+ print_relocs (pure_ebl, dwflmod, ehdr);
if (print_histogram)
handle_hash (ebl);
if (print_symbol_table || print_dynsym_table)
@@ -1971,9 +1976,11 @@ handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, GElf_Phdr *phdr)
case DT_RELASZ:
case DT_STRSZ:
case DT_RELSZ:
+ case DT_RELRSZ:
case DT_RELAENT:
case DT_SYMENT:
case DT_RELENT:
+ case DT_RELRENT:
case DT_PLTPADSZ:
case DT_MOVEENT:
case DT_MOVESZ:
@@ -2049,7 +2056,7 @@ print_dynamic (Ebl *ebl)
/* Print relocations. */
static void
-print_relocs (Ebl *ebl, GElf_Ehdr *ehdr)
+print_relocs (Ebl *ebl, Dwfl_Module *mod, GElf_Ehdr *ehdr)
{
/* Find all relocation sections and handle them. */
Elf_Scn *scn = NULL;
@@ -2066,6 +2073,8 @@ print_relocs (Ebl *ebl, GElf_Ehdr *ehdr)
handle_relocs_rel (ebl, ehdr, scn, shdr);
else if (shdr->sh_type == SHT_RELA)
handle_relocs_rela (ebl, ehdr, scn, shdr);
+ else if (shdr->sh_type == SHT_RELR)
+ handle_relocs_relr (ebl, mod, scn, shdr);
}
}
}
@@ -2454,6 +2463,114 @@ handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr)
}
}
+/* Handle a relocation section. */
+static void
+handle_relocs_relr (Ebl *ebl, Dwfl_Module *mod, Elf_Scn *scn, GElf_Shdr *shdr)
+{
+ int class = gelf_getclass (ebl->elf);
+ size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_RELR, 1, EV_CURRENT);
+ int nentries = shdr->sh_size / sh_entsize;
+
+ /* Get the data of the section. */
+ Elf_Data *data = elf_getdata (scn, NULL);
+ if (data == NULL)
+ return;
+
+ /* Get the section header string table index. */
+ size_t shstrndx;
+ if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
+ error_exit (0, _("cannot get section header string table index"));
+
+ /* A .relr.dyn section does not refer to a specific section. */
+ printf (ngettext ("\
+\nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n",
+ "\
+\nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n",
+ nentries),
+ (unsigned int) elf_ndxscn (scn),
+ elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
+ shdr->sh_offset,
+ nentries);
+
+ if (class == ELFCLASS32)
+ {
+ uint32_t base = 0;
+ for (int cnt = 0; cnt < nentries; ++cnt)
+ {
+ Elf32_Word *words = data->d_buf;
+ Elf32_Word entry = words[cnt];
+
+ /* Just the raw entries? */
+ if (print_unresolved_addresses)
+ printf (" %#010" PRIx32 "%s\n", entry,
+ (entry & 1) == 0 ? " *" : "");
+ else
+ {
+ /* A real address, also sets base. */
+ if ((entry & 1) == 0)
+ {
+ printf (" ");
+ print_dwarf_addr (mod, 4, entry, entry);
+ printf (" *\n");
+
+ base = entry + 4;
+ }
+ else
+ {
+ /* Untangle address from base and bits. */
+ uint32_t addr;
+ for (addr = base; (entry >>= 1) != 0; addr += 4)
+ if ((entry & 1) != 0)
+ {
+ printf (" ");
+ print_dwarf_addr (mod, 4, addr, addr);
+ printf ("\n");
+ }
+ base += 4 * (4 * 8 - 1);
+ }
+ }
+ }
+ }
+ else
+ {
+ uint64_t base = 0;
+ for (int cnt = 0; cnt < nentries; ++cnt)
+ {
+ Elf64_Xword *xwords = data->d_buf;
+ Elf64_Xword entry = xwords[cnt];
+
+ /* Just the raw entries? */
+ if (print_unresolved_addresses)
+ printf (" %#018" PRIx64 "%s\n", entry,
+ (entry & 1) == 0 ? " *" : "");
+ else
+ {
+ /* A real address, also sets base. */
+ if ((entry & 1) == 0)
+ {
+ printf (" ");
+ print_dwarf_addr (mod, 8, entry, entry);
+ printf (" *\n");
+
+ base = entry + 8;
+ }
+ else
+ {
+ /* Untangle address from base and bits. */
+ uint64_t addr;
+ for (addr = base; (entry >>= 1) != 0; addr += 8)
+ if ((entry & 1) != 0)
+ {
+ printf (" ");
+ print_dwarf_addr (mod, 8, addr, addr);
+ printf ("\n");
+ }
+ base += 8 * (8 * 8 - 1);
+ }
+ }
+ }
+ }
+}
/* Print the program header. Return true if a symtab is printed,
false otherwise. */
@@ -4107,7 +4224,7 @@ get_debug_elf_data (Dwarf *dbg, Ebl *ebl, int idx, Elf_Scn *scn)
return elf_getdata (scn, NULL);
}
-void
+static void
print_dwarf_addr (Dwfl_Module *dwflmod,
int address_size, Dwarf_Addr address, Dwarf_Addr raw)
{

7
elfutils.spec
View File

@ -1,6 +1,6 @@
Name: elfutils
Version: 0.189
%global baserelease 4
%global baserelease 5
Release: %{baserelease}%{?dist}
URL: http://elfutils.org/
%global source_url ftp://sourceware.org/pub/elfutils/%{version}/
@ -82,6 +82,8 @@ Patch3: elfutils-0.189-elfcompress.patch
Patch4: elfutils-0.189-elf_getdata_rawchunk.patch
# PR29696: Removed secondary fd close in cache config causing race condition
Patch5: elfutils-0.189-debuginfod_config_cache-double-close.patch
# Bug 28495 - Add support for SHT_RELR to eu-readelf
Patch6: elfutils-0.189-relr.patch
%description
Elfutils is a collection of utilities, including stack (to show
@ -450,6 +452,9 @@ exit 0
%systemd_postun_with_restart debuginfod.service
%changelog
* Wed Aug 23 2023 Mark Wielaard <mjw@fedoraproject.org> - 0.189-5
- Add elfutils-0.189-relr.patch
* Wed Jul 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 0.189-4
- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild