| Commit message (Collapse) | Author | Age | Files | Lines |
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All archive members from libebl.a are now in libdw.a. We don't generate
separate backend shared libraries anymore. So remove them from the
elfutils.spec file.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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Currently, architecture-specific code for libebl exists in separate
libebl_$ARCH.so libraries which libebl loads with dlopen() at runtime.
This makes it impossible to have standalone, statically-linked binaries
which use libdwfl if they depend on any architecture-specific
functionality. Additionally, when these libraries cannot be found, the
failure modes are non-obvious. So, let's get rid of libebl_$arch.so and
move it all into libdw.so/libdw.a, which simplifies things considerably.
Signed-off-by: Omar Sandoval <osandov@fb.com>
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Currently, libcpu and libebl are always compiled as PIC. An upcoming
change will add the objects from libcpu.a and libebl.a to libdw.a, which
should not be PIC unless configured that way. So, make libcpu.a and
libebl.a non-PIC and add libcpu_pic.a and libebl_pic.a.
Signed-off-by: Omar Sandoval <osandov@fb.com>
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gen_SOURCES is assigned to libebl_a_SOURCES and never used again. Get
rid of it.
Signed-off-by: Omar Sandoval <osandov@fb.com>
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C-SKY V2 ABI manual:
https://github.com/c-sky/csky-doc/blob/master/C-SKY_V2_CPU_Applications_Binary_Interface_Standards_Manual.pdf
C-SKY architecture user guide:
https://github.com/c-sky/csky-doc/blob/master/CSKY%20Architecture%20user_guide.pdf
Signed-off-by: Mao Han <han_mao@c-sky.com>
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To print eh human readable description of the ELF e_machine header field
we used the ebl name. But this is not set for most EM constants. Introduce
a new function dwelf_elf_e_machine_string that does work for all known
EM values. Use that in eu-readelf to print a string representation of the
e_machine value.
Since this was the only usage of ebl->name, remove that from struct ebl.
Also add a testcase that makes sure dwelf_elf_e_machine_string works for
all EM values in the libelf/elf.h header so we will immediately notice
when a new value appears.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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eblopenbackend tries to find libraries based on the $ORIGIN/../$LIB/
path. But depending on whether the system is multilib or multiarch
this doesn't always work. On multilib systems $LIB is always just one
directory deep (it is either .../lib or .../lib64) but on multiarch
systems it can be multiple directories deep (.../lib/x86_64-linux-gnu).
This means that on multiarch systems $ORIGIN/../$LIB only works for
binaries (where origin is .../bin/), but not for libraries.
Most of the time it still works because of RPATH which is tried afterwards.
But RPATH processing does not always work reliable.
So try multiple paths first. The first time using the $ORIGIN as if it
came from an executable (in bin/) and then using the $ORIGIN as if it
came from an library (in lib[64]/ or lib/<arch>/). So first time using
../$LIB and second time just with the elfutils EBL_SUBDIR.
The first is what we do now and always work on multilib systems. The
second try works when loading relative to a library whether on a multilib
or multiarch system.
Then we use the same fallback (not using any path) we used already
(to take advantage of any RPATH or LD_LIBRARY_PATH setting).
https://sourceware.org/bugzilla/show_bug.cgi?id=24488
Signed-off-by: Mark Wielaard <mark@klomp.org>
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For STB_GNU_UNIQUE and STT_GNU_IFUNC we need to check the elf of the
given ebl. Make sure the ebl given isn't NULL.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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The GNU property note data is padded. Make sure the extra padding
still fits in the note description.
https://sourceware.org/bugzilla/show_bug.cgi?id=24075
Signed-off-by: Mark Wielaard <mark@klomp.org>
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Most strings in core notes are fixed size. But NT_PLATFORM contains just
a variable length string. Check that it is actually zero terminated
before passing to readelf to print.
https://sourceware.org/bugzilla/show_bug.cgi?id=24089
Signed-off-by: Mark Wielaard <mark@klomp.org>
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Before printing the data values, make sure pr_datasz doesn't go beyond
the end of the note description data.
https://sourceware.org/bugzilla/show_bug.cgi?id=24075
Signed-off-by: Mark Wielaard <mark@klomp.org>
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When reading a GNU_PROPERTY_STACK_SIZE we need to use the proper data
type. GElf_Addr is 64bit always and when reading a 32bit size part of
it would not be initialized. Use either Elf32_Addr or Elf64_Addr to
read and print the data.
Add 32bit and 64bit, little and big endian testcases.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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Harmless, but useless.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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GNU Build Attribute ELF Notes are generated by the GCC annobin plugin
and described at https://fedoraproject.org/wiki/Toolchain/Watermark
Unfortunately the constants aren't yet described in the standard glibc
elf.h so they have been added to the elfutils specific elf-knowledge.h.
The notes abuse the name owner field to encode some data not in the
description. This makes it a bit hard to parse. We have to match the
note owner name prefix (to "GA") to be sure the type is valid. We also
cannot rely on the owner name being a valid C string since the attribute
name and value can contain zero (terminators). So pass around namesz
to the ebl note parsing functions.
eu-elflint will recognize and eu-readelf -n will now show the notes:
Note section [27] '.gnu.build.attributes' of 56080 bytes at offset 0x114564:
Owner Data size Type
GA 16 GNU Build Attribute OPEN
Address Range: 0x2f30f - 0x2f30f
VERSION: "3p8"
GA 0 GNU Build Attribute OPEN
TOOL: "gcc 8.2.1 20180801"
GA 0 GNU Build Attribute OPEN
"GOW": 45
GA 0 GNU Build Attribute OPEN
STACK_PROT: 0
GA 0 GNU Build Attribute OPEN
"stack_clash": TRUE
GA 0 GNU Build Attribute OPEN
"cf_protection": 0
GA 0 GNU Build Attribute OPEN
"GLIBCXX_ASSERTIONS": TRUE
GA 0 GNU Build Attribute OPEN
"FORTIFY": 0
GA 0 GNU Build Attribute OPEN
PIC: 3
GA 0 GNU Build Attribute OPEN
SHORT_ENUM: FALSE
GA 0 GNU Build Attribute OPEN
ABI: c001100000012
GA 0 GNU Build Attribute OPEN
"stack_realign": FALSE
A new test was added to run-readelf -n for the existing annobin file.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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NT_VERSION notes are emitted by the gas .version directive.
They have an empty description and (ab)use the owner name to store the
version data string.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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GNU Property notes are different from normal notes because they use
variable alignment/padding of their fields. They are 8 byte aligned,
but use 4 byte fields. The name is aligned at 4 bytes and padded so
that, the desc is aligned at 8 bytes. The whole note is padded to
8 bytes again. For normal notes all fields are both 4 bytes wide and
4 bytes aligned.
To recognize these new kind of ELF Notes a new Elf_Type is introduced,
ELF_T_NHDR8. This type is used in the xlate functions to determine
how to align and pad the various fields. Since the fields themselves
can now have different alignments we will have to keep track of the
current alignement and use either NOTE_ALIGN4 or NOTE_ALIGN8 to
determine the padding.
To set the correct Elf_Type on the Elf_Data we use either the section
sh_addralign or the segment p_align values. Assuming 8 means the
section or segment contains the new style notes, otherwise normal
notes.
When we cannot determine the "alignment" directly, like when parsing
special kernel sys files, we check the name "GNU" and type
"GNU_PROPERTY_TYPE_0" fields.
ebl_object_note now parses the new NT_GNU_PROPERTY_TYPE_0 and can
extract the GNU_PROPERTY_STACK_SIZE, GNU_PROPERTY_NO_COPY_ON_PROTECTED
and GNU_PROPERTY_X86_FEATURE_1_AND types GNU_PROPERTY_X86_FEATURE_1_IBT
and GNU_PROPERTY_X86_FEATURE_1_SHSTK.
Tests are added for extracting the note from sections or segments
as set by gcc -fcf-protection.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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This adds support for ADD and SUB relocations as seen on RISC-V.
Signed-off-by: Andreas Schwab <schwab@suse.de>
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The ebl_section_strip_p function used the Ehdr e_shstrndx field
to get at the name of the (debug) sections. This is not correct
if there are more than SHN_LORESERVE sections. Use elf_getshdrstrndx
to get at the shstrtab section. And drop the Ehdr argument that isn't
necessary anymore.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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The check_special_symbol backend functions used the Ehdr e_shstrndx
field to get at the name of sections. This is not correct if there
are more than SHN_LORESERVE sections. Always use elf_getshdrstrndx
to get the shstrtab section. And drop the Ehdr argument that isn't
necessary anymore.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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error.h isn't standard and so isn't part of the musl C library.
To easy future porting, consolidate the inclusion of error.h into system.h.
https://sourceware.org/bugzilla/show_bug.cgi?id=21008
Signed-off-by: Ross Burton <ross.burton@intel.com>
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This adds the new DWARF5 debug section names .debug_addr, .debug_line_str,
.debug_loclists, .debug_names, .debug_rnglists and .debug_str_offsets. This
makes sure eu-strip knows to strip them away.
Note that it doesn't add the .dwo variants, nor the .dwp only section
names .debug_cu_index and .debug_tu_index, nor the .debug_sup section
for supplemental DWARF files.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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This implements initial support for the RISC-V architecture. It has
been tested with qemu linux-user emulation
<https://build.opensuse.org/package/live_build_log/openSUSE:Factory:RISCV/elfutils/standard/riscv64>,
with the following unresolved issues
FAIL: run-strip-strmerge.sh
===========================
elflint /home/abuild/rpmbuild/BUILD/elfutils-0.170/tests/elfstrmerge
section [32] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x51c0 does not match .got section address 0x5010
section [32] '.symtab': symbol 119: st_value out of bounds
FAIL run-strip-strmerge.sh (exit status: 1)
FAIL: run-elflint-self.sh
=========================
section [33] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x6220 does not match .got section address 0x6008
section [33] '.symtab': symbol 135: st_value out of bounds
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/addr2line
section [33] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x91d8 does not match .got section address 0x9040
section [33] '.symtab': symbol 163: st_value out of bounds
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elfcmp
section [33] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x1a2a0 does not match .got section address 0x1a040
section [33] '.symtab': symbol 267: st_value out of bounds
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint
section [33] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0xd418 does not match .got section address 0xd0f0
section [33] '.symtab': symbol 238: st_value out of bounds
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/nm
section [33] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0xa2d0 does not match .got section address 0xa0b0
section [33] '.symtab': symbol 193: st_value out of bounds
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/objdump
section [33] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x2e5b8 does not match .got section address 0x2e058
section [33] '.symtab': symbol 410: st_value out of bounds
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/readelf
section [32] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x171b8 does not match .got section address 0x17010
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/libelf/libelf.so
section [32] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x3a5b0 does not match .got section address 0x3a0d8
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/libdw/libdw.so
section [31] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0xd0c8 does not match .got section address 0xd008
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/backends/libebl_i386.so
section [31] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0xf0c8 does not match .got section address 0xf008
*** failure in /home/abuild/rpmbuild/BUILD/elfutils-0.170/src/elflint --quiet --gnu-ld /home/abuild/rpmbuild/BUILD/elfutils-0.170/backends/libebl_x86_64.so
FAIL run-elflint-self.sh (exit status: 1)
FAIL: run-native-test.sh
========================
/home/abuild/rpmbuild/BUILD/elfutils-0.170/tests/allregs: dwfl_module_register_names: no backend registers known
FAIL run-native-test.sh (exit status: 1)
FAIL: run-backtrace-native-core.sh
==================================
backtrace: backtrace.c:111: callback_verify: Assertion `symname && strcmp (symname, "raise") == 0' failed.
./test-subr.sh: line 84: 26040 Aborted (core dumped) LD_LIBRARY_PATH="${built_library_path}${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH" $VALGRIND_CMD "$@"
backtrace-child-core.26027: no main
rmdir: failed to remove 'test-26016': Directory not empty
FAIL run-backtrace-native-core.sh (exit status: 1)
In addition, all tests that use ptrace are failing as linux-user
emulation does not implement it.
There are no regressions for a x86_64 build.
Signed-off-by: Andreas Schwab <schwab@suse.de>
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SYMTAB_SHNDX was introduced when elf.h was imported, but not yet handled
in ebl_dynamic_tag_name. Handle it and add an eu_static_assert to make
sure stdtags always contains DT_NUM entries.
https://sourceware.org/bugzilla/show_bug.cgi?id=22976
Signed-off-by: Mark Wielaard <mark@klomp.org>
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eu-elflint uses ebl_check_reloc_target_type to determine whether a section
is a valid relocation target. In Fedora rawhide there are new ELF notes
(annobin) which have relocations against them in ET_REL files. eu-elflint
currently flags these as invalid. It looks like that is not correct.
I cannot find any reason an SHT_NOTE section cannot have relocations
against it. So this patch allows them.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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Use __attribute__ ((fallthrough)) to indicate switch case fall through
instead of a comment. This ensures that the fallthrough warning is not
triggered even if the file is pre-processed (hence stripping the
comments) before it is compiled.
The actual fallback implementation is hidden behind a FALLBACK macro in
case the compiler doesn't support it.
Finally, the -Wimplict-fallthrough warning was upgraded to only allow
the attribute to satisfy it; a comment alone is no longer sufficient.
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
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Those flags are not available on all platforms, and omitting them when
not available will not cause any harm. In particular:
-z,defs disallows undefined symbols in object files. This option is
unsupported if the target binary format enforces the same condition
already. Furthermore it is only a compile time sanity check. When it is
omitted, the same binary is produced.
-z,relro instructs the loader to mark sections read-only after loading
the library, where possible. This is a hardening mechanism. If it is
unavailable, the functionality of the code is not affected in any way.
-fPIC instructs the compiler to produce position independent code. While
this is preferable to relocatable code, relocatable code also works and
may even be faster. Relocatable code might just be loaded into memory
multiple times for different processes.
-fPIE is the same thing as -fPIC for executables rather than shared
libraries.
Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
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Since POWER8, PowerPC 64 supports Hardware Transactional Memory, which has
three special purpose registers associated to it: tfhar, tfiar, and texasr.
This commit add HTM SPRs set as known note type so it's possible to use
'readelf --notes' to inspect the HTM SPRs in a coredump file generated in
such a machines.
Signed-off-by: Gustavo Romero <gromero@linux.vnet.ibm.com>
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ARM data marker symbols "$d" indicate the start of a sequence of data
items in a section. For data only sections no data marker symbol is
necessary, but may be put pointing to the start of the section.
binutils however has a bug which places a data marker symbol somewhere
inside the section (at least for .debug_frame).
https://sourceware.org/bugzilla/show_bug.cgi?id=21809
When strip finds a symbol pointing to a debug section that would be
put into the .debug file then it will copy over the whole symbol table.
This isn't necessary because the symbol is redundant.
Add an ebl hook to recognize data marker symbols with implementations
for arm and aarch64. Use it in strip to strip such symbols from the
symbol table if they point to a debug section.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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__attribute__ is a GNU extension. If we want to link against the
libraries using a different compiler, it needs to be disabled. It was
already disabled in libdw.h, and this patch extends this to the other
headers. We move the defines to libelf.h as that is included in all
the others.
Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
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If it doesn't exist, provide a definition based on memcpy.
Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
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Move the strtab functions from libebl to libdw. Programs often want to
create ELF/DWARF string tables. We don't want (static) linking against
ebl since those are internal functions that might change.
This introduces dwelf_strtab_init, dwelf_strtab_add,
dwelf_strtab_add_len, dwelf_strtab_finalize, dwelf_strent_off,
dwelf_strent_str and dwelf_strtab_free. Documentation for each has
been added to libdwelf.h. The add fucntion got a variant that takes
the length explicitly and finalize was changed to return NULL on
out of memory instead of aborting. All code and tests now uses the
new functions.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Nobody has hacked on eu-ld in a very long time. It didn't really work.
And we didn't install it by default in the spec file. Remove sources,
the build rules and any (now) unused code.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Signed-off-by: Richard Henderson <rth@redhat.com>
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Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
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We used to assume any unknown ELF note provider name was "GNU" and didn't
recognize any of the "Go" provider types. We now check the provider name
explictly in ebl_object_note_type_name and recognize the following Go
note names: PKGLIST, ABIHASH, DEPS and BUILDID. But there is no attempt
yet in ebl_object_note to decode the description of these notes.
https://bugzilla.redhat.com/show_bug.cgi?id=1295951
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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GCC6 [will have] a nice new warning that showed a real bug:
elfutils/libebl/eblobjnote.c: In function ‘ebl_object_note’:
elfutils/libebl/eblobjnote.c:135:5: error: statement is indented as if it were guarded by... [-Werror=misleading-indentation]
switch (type)
^~~~~~
elfutils/libebl/eblobjnote.c:45:3: note: ...this ‘if’ clause, but it is not
if (! ebl->object_note (name, type, descsz, desc))
^~
And indeed, it should have been under the if, but wasn't because of missing
brackets. Added brackets (and reindent).
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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This makes usage of the libdwfl symbol functions work out of the box even
when some sections (string, symbol or xndx) are compressed. For ET_REL
files this makes relocations just work by making sure the target section
is decompressed first before relocations are applied.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Some backends need to fine-tune the return address as fetched from the
corresponding CFI register. This patch adds a new backend attribute
ra_offset and the corresponding ebl_ra_offset getter function.
Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com>
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This avoids relocation overflows in sparc/sparc64 targets while
linking, where the reachable data using -fpic is only 4kb.
Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com>
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We already require -std=gnu99 and old-style function definitions might
hide some compiler warnings.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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GCC6 and Clang give warnings on redundant NULL tests of parameters
that are declared with __nonnull_attribute__.
Signed-off-by: Chih-Hung Hsieh <chh@google.com>
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Signed-off-by: Chih-Hung Hsieh <chh@google.com>
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Seen in run-elflint-self.sh for size.o when build with --enable-gcov.
https://bugzilla.redhat.com/show_bug.cgi?id=1230798
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Normally an NT_GNU_ABI_TAG is large, just 4 words (16 bytes).
Only use stack allocated conversion buf for small (max 16 words) notes.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Help the compiler see we stack allocate a small array. Add assert to check
no machine prefix is ever larger than 16. Current maximum number is 7.
This prevents gcc warning about possible unbounded stack usage with
-Wstack-usage.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Make it really, really clear that the libebl interface is NOT source and
NOT abi compatible and we will break any users.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Using elf_getphdrnum lets us handle ELF files that use more than PN_XNUM
phdrs. And guards against some corrupt files.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Since elf_strptr can fail and return NULL we should always check the result
before usage. Debug sections are only handled by section name, so make sure
the name actually exists.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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The ARM EABI says that the zero bit of function symbol st_value indicates
whether the symbol points to a THUMB or ARM function. Also the return
value address in an unwind will contain the same extra bit to indicate
whether to return to a regular ARM or THUMB function. Add a new ebl
function to mask off such bits and turn a function value into a function
address so that we get the actual value that a function symbol or return
address points to. It isn't easily possible to reuse the existing
ebl_resolve_sym_value for this purpose, so we end up with another hook
that can be used from dwfl_module_getsym, handle_cfi and elflint.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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And implement for arm and ia64. Both have special section types that
are valid targets for a reloc. Both refer to unwind data. elflint now
just calls ebl_check_reloc_target_type instead of hard coding the
expected section types.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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