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elf: Replace tst-p_alignmod1-editX with a python script

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This avoid the cross-compiling breakage when the test should not run
($(run-built-tests) equal to no).

Checked on x86_64-linux-gnu and i686-linux-gnu as well with a cross
compile to aarch64-linux-gnu and powerpc64-linux-gnu.
This commit is contained in:
Adhemerval Zanella 2022-01-25 13:33:13 -03:00
parent 4f20a1dc52
commit e4ba8fee1a
5 changed files with 210 additions and 190 deletions
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14
elf/Makefile
View File

@ -413,8 +413,6 @@ tests += \
tst-nodelete-opened \
tst-noload \
tst-null-argv \
tst-p_alignmod1-edit \
tst-p_alignmod2-edit \
tst-p_align1 \
tst-p_align2 \
tst-p_align3 \
@ -2607,23 +2605,19 @@ $(objpfx)tst-p_align1: $(objpfx)tst-p_alignmod1.so
# Make a copy of tst-p_alignmod-base.so and lower p_align of the first
# PT_LOAD segment.
$(objpfx)tst-p_alignmod1.so: $(objpfx)tst-p_alignmod1-edit \
$(objpfx)tst-p_alignmod-base.so
$(objpfx)tst-p_alignmod1.so: $(objpfx)tst-p_alignmod-base.so
rm -f $@
cp $(objpfx)tst-p_alignmod-base.so $@
$(test-wrapper-env) $(run-program-env) $(rtld-prefix) \
$(objpfx)tst-p_alignmod1-edit $@
$(PYTHON) $(..)scripts/tst-elf-edit.py -a half $@
$(objpfx)tst-p_align2: $(objpfx)tst-p_alignmod2.so
# Make a copy of tst-p_alignmod-base.so and update p_align of the first
# PT_LOAD segment.
$(objpfx)tst-p_alignmod2.so: $(objpfx)tst-p_alignmod2-edit \
$(objpfx)tst-p_alignmod-base.so
$(objpfx)tst-p_alignmod2.so: $(objpfx)tst-p_alignmod-base.so
rm -f $@
cp $(objpfx)tst-p_alignmod-base.so $@
$(test-wrapper-env) $(run-program-env) $(rtld-prefix) \
$(objpfx)tst-p_alignmod2-edit $@
$(PYTHON) $(..)scripts/tst-elf-edit.py -a 1 $@
LDFLAGS-tst-p_alignmod3.so += -Wl,-z,max-page-size=0x100,-z,common-page-size=0x100

126
elf/tst-elf-edit.h
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@ -1,126 +0,0 @@
/* Update p_align of the first PT_LOAD segment.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <link.h>
#include <error.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/mman.h>
const char *file_name;
static size_t update_p_align (size_t);
int
main (int argc, char ** argv)
{
if (argc != 2)
{
printf ("Usage: %s: file\n", argv[0]);
return 0;
}
file_name = argv[1];
struct stat statbuf;
int errno_saved;
if (stat (file_name, &statbuf) < 0)
error (1, errno, "%s: not exist", file_name);
ElfW(Ehdr) *ehdr;
if (statbuf.st_size < sizeof (*ehdr))
error (1, 0, "%s: too small", file_name);
int fd = open (file_name, O_RDWR);
if (fd < 0)
error (1, errno, "%s: can't open", file_name);
/* Map in the whole file. */
void *base = mmap (NULL, statbuf.st_size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (base == MAP_FAILED)
{
errno_saved = errno;
close (fd);
error (1, errno_saved, "%s: failed to map", file_name);
}
ehdr = (ElfW(Ehdr) *) base;
if (ehdr->e_ident[EI_MAG0] != ELFMAG0
|| ehdr->e_ident[EI_MAG1] != ELFMAG1
|| ehdr->e_ident[EI_MAG2] != ELFMAG2
|| ehdr->e_ident[EI_MAG3] != ELFMAG3)
{
close (fd);
error (1, 0, "%s: bad ELF header", file_name);
}
if (ehdr->e_type != ET_DYN)
{
close (fd);
error (1, 0, "%s: not shared library", file_name);
}
bool unsupported_class = true;
switch (ehdr->e_ident[EI_CLASS])
{
default:
break;
case ELFCLASS32:
unsupported_class = __ELF_NATIVE_CLASS != 32;
break;
case ELFCLASS64:
unsupported_class = __ELF_NATIVE_CLASS != 64;
break;
}
if (unsupported_class)
{
close (fd);
error (1, 0, "%s: unsupported ELF class: %d",
file_name, ehdr->e_ident[EI_CLASS]);
}
size_t phdr_size = sizeof (ElfW(Phdr)) * ehdr->e_phentsize;
if (statbuf.st_size < (ehdr->e_phoff + phdr_size))
{
close (fd);
error (1, 0, "%s: too small", file_name);
}
ElfW(Phdr) *phdr = (ElfW(Phdr) *) (base + ehdr->e_phoff);
for (int i = 0; i < ehdr->e_phnum; i++, phdr++)
if (phdr->p_type == PT_LOAD)
{
/* Update p_align of the first PT_LOAD segment. */
phdr->p_align = update_p_align (phdr->p_align);
break;
}
munmap (base, statbuf.st_size);
close (fd);
return 0;
}

27
elf/tst-p_alignmod1-edit.c
View File

@ -1,27 +0,0 @@
/* Reduce p_align of the first PT_LOAD segment by half.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-elf-edit.h"
/* Reduce p_align by half. */
static size_t
update_p_align (size_t p_align)
{
return p_align >> 1;
}

27
elf/tst-p_alignmod2-edit.c
View File

@ -1,27 +0,0 @@
/* Set p_align of the first PT_LOAD segment to 1.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-elf-edit.h"
/* Set p_align to 1. */
static size_t
update_p_align (size_t p_align __attribute__ ((unused)))
{
return 1;
}

206
scripts/tst-elf-edit.py Normal file
View File

@ -0,0 +1,206 @@
#!/usr/bin/python3
# ELF editor for load align tests.
# Copyright (C) 2022 Free Software Foundation, Inc.
# Copyright The GNU Toolchain Authors.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
import argparse
import os
import sys
import struct
EI_NIDENT=16
EI_MAG0=0
ELFMAG0=b'\x7f'
EI_MAG1=1
ELFMAG1=b'E'
EI_MAG2=2
ELFMAG2=b'L'
EI_MAG3=3
ELFMAG3=b'F'
EI_CLASS=4
ELFCLASSNONE=b'0'
ELFCLASS32=b'\x01'
ELFCLASS64=b'\x02'
EI_DATA=5
ELFDATA2LSB=b'\x01'
ELFDATA2MSB=b'\x02'
ET_DYN=3
PT_LOAD=1
def elf_types_fmts(e_ident):
endian = '<' if e_ident[EI_DATA] == ELFDATA2LSB else '>'
addr = 'I' if e_ident[EI_CLASS] == ELFCLASS32 else 'Q'
off = 'I' if e_ident[EI_CLASS] == ELFCLASS32 else 'Q'
return (endian, addr, off)
class Elf_Ehdr:
def __init__(self, e_ident):
endian, addr, off = elf_types_fmts(e_ident)
self.fmt = '{0}HHI{1}{2}{2}IHHHHHH'.format(endian, addr, off)
self.len = struct.calcsize(self.fmt)
def read(self, f):
buf = f.read(self.len)
if not buf:
error('{}: header too small'.format(f.name))
data = struct.unpack(self.fmt, buf)
self.e_type = data[0]
self.e_machine = data[1]
self.e_version = data[2]
self.e_entry = data[3]
self.e_phoff = data[4]
self.e_shoff = data[5]
self.e_flags = data[6]
self.e_ehsize = data[7]
self.e_phentsize= data[8]
self.e_phnum = data[9]
self.e_shstrndx = data[10]
class Elf_Phdr:
def __init__(self, e_ident):
endian, addr, off = elf_types_fmts(e_ident)
self.ei_class = e_ident[EI_CLASS]
if self.ei_class == ELFCLASS32:
self.fmt = '{0}I{2}{1}{1}IIII'.format(endian, addr, off)
else:
self.fmt = '{0}II{2}{1}{1}QQQ'.format(endian, addr, off)
self.len = struct.calcsize(self.fmt)
def read(self, f):
buf = f.read(self.len)
if len(buf) < self.len:
error('{}: program header too small'.format(f.name))
data = struct.unpack(self.fmt, buf)
if self.ei_class == ELFCLASS32:
self.p_type = data[0]
self.p_offset = data[1]
self.p_vaddr = data[2]
self.p_paddr = data[3]
self.p_filesz = data[4]
self.p_memsz = data[5]
self.p_flags = data[6]
self.p_align = data[7]
else:
self.p_type = data[0]
self.p_flags = data[1]
self.p_offset = data[2]
self.p_vaddr = data[3]
self.p_paddr = data[4]
self.p_filesz = data[5]
self.p_memsz = data[6]
self.p_align = data[7]
def write(self, f):
if self.ei_class == ELFCLASS32:
data = struct.pack(self.fmt,
self.p_type,
self.p_offset,
self.p_vaddr,
self.p_paddr,
self.p_filesz,
self.p_memsz,
self.p_flags,
self.p_align)
else:
data = struct.pack(self.fmt,
self.p_type,
self.p_flags,
self.p_offset,
self.p_vaddr,
self.p_paddr,
self.p_filesz,
self.p_memsz,
self.p_align)
f.write(data)
def error(msg):
print(msg, file=sys.stderr)
sys.exit(1)
def elf_edit_align(phdr, align):
if align == 'half':
phdr.p_align = phdr.p_align >> 1
else:
phdr.p_align = int(align)
def elf_edit(f, align):
ei_nident_fmt = 'c' * EI_NIDENT
ei_nident_len = struct.calcsize(ei_nident_fmt)
data = f.read(ei_nident_len)
if len(data) < ei_nident_len:
error('{}: e_nident too small'.format(f.name))
e_ident = struct.unpack(ei_nident_fmt, data)
if e_ident[EI_MAG0] != ELFMAG0 \
or e_ident[EI_MAG1] != ELFMAG1 \
or e_ident[EI_MAG2] != ELFMAG2 \
or e_ident[EI_MAG3] != ELFMAG3:
error('{}: bad ELF header'.format(f.name))
if e_ident[EI_CLASS] != ELFCLASS32 \
and e_ident[EI_CLASS] != ELFCLASS64:
error('{}: unsupported ELF class: {}'.format(f.name, e_ident[EI_CLASS]))
if e_ident[EI_DATA] != ELFDATA2LSB \
and e_ident[EI_DATA] != ELFDATA2MSB: \
error('{}: unsupported ELF data: {}'.format(f.name, e_ident[EI_DATA]))
ehdr = Elf_Ehdr(e_ident)
ehdr.read(f)
if ehdr.e_type != ET_DYN:
error('{}: not a shared library'.format(f.name))
phdr = Elf_Phdr(e_ident)
for i in range(0, ehdr.e_phnum):
f.seek(ehdr.e_phoff + i * phdr.len)
phdr.read(f)
if phdr.p_type == PT_LOAD:
elf_edit_align(phdr, align)
f.seek(ehdr.e_phoff + i * phdr.len)
phdr.write(f)
break
def get_parser():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('-a', dest='align', required=True,
help='How to set the LOAD alignment')
parser.add_argument('output',
help='ELF file to edit')
return parser
def main(argv):
parser = get_parser()
opts = parser.parse_args(argv)
with open(opts.output, 'r+b') as fout:
elf_edit(fout, opts.align)
if __name__ == '__main__':
main(sys.argv[1:])