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efbbd9c33a
Store ISA level in the portion of the unused upper 32 bits of the hwcaps field in cache and the unused pad field in aux cache. ISA level is stored and checked only for shared objects in glibc-hwcaps subdirectories. The shared objects in the default directories aren't checked since there are no fallbacks for these shared objects. Tested on x86-64-v2, x86-64-v3 and x86-64-v4 machines with --disable-hardcoded-path-in-tests and --enable-hardcoded-path-in-tests.
333 lines
9.1 KiB
C
333 lines
9.1 KiB
C
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
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Jakub Jelinek <jakub@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <elf-read-prop.h>
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/* This code is a heavily simplified version of the readelf program
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that's part of the current binutils development version. For architectures
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which need to handle both 32bit and 64bit ELF libraries, this file is
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included twice for each arch size. */
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/* check_ptr checks that a pointer is in the mmaped file and doesn't
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point outside it. */
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#undef check_ptr
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#define check_ptr(ptr) \
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do \
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{ \
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if ((void *)(ptr) < file_contents \
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|| (void *)(ptr) > (file_contents+file_length)) \
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{ \
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error (0, 0, _("file %s is truncated\n"), file_name); \
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return 1; \
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} \
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} \
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while (0);
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/* Returns 0 if everything is ok, != 0 in case of error. */
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int
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process_elf_file (const char *file_name, const char *lib, int *flag,
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unsigned int *osversion, unsigned int *isa_level,
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char **soname, void *file_contents, size_t file_length)
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{
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int i;
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unsigned int j;
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unsigned int dynamic_addr;
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size_t dynamic_size;
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char *program_interpreter;
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ElfW(Ehdr) *elf_header;
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ElfW(Phdr) *elf_pheader, *segment;
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ElfW(Dyn) *dynamic_segment, *dyn_entry;
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char *dynamic_strings;
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elf_header = (ElfW(Ehdr) *) file_contents;
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*osversion = 0;
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if (elf_header->e_ident [EI_CLASS] != ElfW (CLASS))
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{
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if (opt_verbose)
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{
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if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
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error (0, 0, _("%s is a 32 bit ELF file.\n"), file_name);
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else if (elf_header->e_ident [EI_CLASS] == ELFCLASS64)
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error (0, 0, _("%s is a 64 bit ELF file.\n"), file_name);
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else
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error (0, 0, _("Unknown ELFCLASS in file %s.\n"), file_name);
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}
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return 1;
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}
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if (elf_header->e_type != ET_DYN)
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{
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error (0, 0, _("%s is not a shared object file (Type: %d).\n"), file_name,
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elf_header->e_type);
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return 1;
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}
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/* Get information from elf program header. */
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elf_pheader = (ElfW(Phdr) *) (elf_header->e_phoff + file_contents);
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check_ptr (elf_pheader);
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/* The library is an elf library, now search for soname and
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libc5/libc6. */
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*flag = FLAG_ELF;
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/* The default ISA level is 0. */
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*isa_level = 0;
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dynamic_addr = 0;
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dynamic_size = 0;
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program_interpreter = NULL;
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for (i = 0, segment = elf_pheader;
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i < elf_header->e_phnum; i++, segment++)
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{
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check_ptr (segment);
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switch (segment->p_type)
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{
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case PT_DYNAMIC:
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if (dynamic_addr)
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error (0, 0, _("more than one dynamic segment\n"));
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dynamic_addr = segment->p_offset;
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dynamic_size = segment->p_filesz;
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break;
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case PT_INTERP:
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program_interpreter = (char *) (file_contents + segment->p_offset);
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check_ptr (program_interpreter);
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/* Check if this is enough to classify the binary. */
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for (j = 0; j < sizeof (interpreters) / sizeof (interpreters [0]);
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++j)
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if (strcmp (program_interpreter, interpreters[j].soname) == 0)
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{
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*flag = interpreters[j].flag;
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break;
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}
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break;
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case PT_NOTE:
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if (!*osversion && segment->p_filesz >= 32 && segment->p_align >= 4)
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{
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ElfW(Word) *abi_note = (ElfW(Word) *) (file_contents
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+ segment->p_offset);
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ElfW(Addr) size = segment->p_filesz;
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/* NB: Some PT_NOTE segment may have alignment value of 0
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or 1. gABI specifies that PT_NOTE segments should be
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aligned to 4 bytes in 32-bit objects and to 8 bytes in
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64-bit objects. As a Linux extension, we also support
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4 byte alignment in 64-bit objects. If p_align is less
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than 4, we treate alignment as 4 bytes since some note
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segments have 0 or 1 byte alignment. */
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ElfW(Addr) align = segment->p_align;
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if (align < 4)
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align = 4;
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else if (align != 4 && align != 8)
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continue;
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while (abi_note [0] != 4 || abi_note [1] != 16
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|| abi_note [2] != 1
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|| memcmp (abi_note + 3, "GNU", 4) != 0)
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{
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ElfW(Addr) note_size
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= ELF_NOTE_NEXT_OFFSET (abi_note[0], abi_note[1],
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align);
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if (size - 32 < note_size || note_size == 0)
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{
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size = 0;
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break;
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}
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size -= note_size;
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abi_note = (void *) abi_note + note_size;
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}
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if (size == 0)
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break;
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*osversion = ((abi_note [4] << 24)
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| ((abi_note [5] & 0xff) << 16)
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| ((abi_note [6] & 0xff) << 8)
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| (abi_note [7] & 0xff));
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}
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break;
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case PT_GNU_PROPERTY:
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/* The NT_GNU_PROPERTY_TYPE_0 note must be aligned to 4 bytes
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in 32-bit objects and to 8 bytes in 64-bit objects. Skip
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notes with incorrect alignment. */
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if (segment->p_align == (__ELF_NATIVE_CLASS / 8))
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{
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const ElfW(Nhdr) *note = (const void *) (file_contents
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+ segment->p_offset);
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const ElfW(Addr) size = segment->p_filesz;
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const ElfW(Addr) align = segment->p_align;
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const ElfW(Addr) start = (ElfW(Addr)) (uintptr_t) note;
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unsigned int last_type = 0;
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while ((ElfW(Addr)) (uintptr_t) (note + 1) - start < size)
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{
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/* Find the NT_GNU_PROPERTY_TYPE_0 note. */
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if (note->n_namesz == 4
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&& note->n_type == NT_GNU_PROPERTY_TYPE_0
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&& memcmp (note + 1, "GNU", 4) == 0)
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{
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/* Check for invalid property. */
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if (note->n_descsz < 8
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|| (note->n_descsz % sizeof (ElfW(Addr))) != 0)
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goto done;
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/* Start and end of property array. */
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unsigned char *ptr = (unsigned char *) (note + 1) + 4;
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unsigned char *ptr_end = ptr + note->n_descsz;
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do
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{
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unsigned int type = *(unsigned int *) ptr;
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unsigned int datasz = *(unsigned int *) (ptr + 4);
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/* Property type must be in ascending order. */
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if (type < last_type)
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goto done;
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ptr += 8;
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if ((ptr + datasz) > ptr_end)
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goto done;
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last_type = type;
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/* Target specific property processing.
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Return value:
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false: Continue processing the properties.
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true : Stop processing the properties.
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*/
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if (read_gnu_property (isa_level, type,
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datasz, ptr))
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goto done;
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/* Check the next property item. */
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ptr += ALIGN_UP (datasz, sizeof (ElfW(Addr)));
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}
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while ((ptr_end - ptr) >= 8);
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/* Only handle one NT_GNU_PROPERTY_TYPE_0. */
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goto done;
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}
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note = ((const void *) note
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+ ELF_NOTE_NEXT_OFFSET (note->n_namesz,
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note->n_descsz,
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align));
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}
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}
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done:
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break;
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default:
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break;
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}
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}
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/* Now we can read the dynamic sections. */
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if (dynamic_size == 0)
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return 1;
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dynamic_segment = (ElfW(Dyn) *) (file_contents + dynamic_addr);
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check_ptr (dynamic_segment);
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/* Find the string table. */
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dynamic_strings = NULL;
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for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
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++dyn_entry)
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{
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check_ptr (dyn_entry);
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if (dyn_entry->d_tag == DT_STRTAB)
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{
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/* Find the file offset of the segment containing the dynamic
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string table. */
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ElfW(Off) loadoff = -1;
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for (i = 0, segment = elf_pheader;
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i < elf_header->e_phnum; i++, segment++)
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{
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if (segment->p_type == PT_LOAD
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&& dyn_entry->d_un.d_val >= segment->p_vaddr
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&& (dyn_entry->d_un.d_val - segment->p_vaddr
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< segment->p_filesz))
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{
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loadoff = segment->p_vaddr - segment->p_offset;
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break;
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}
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}
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if (loadoff == (ElfW(Off)) -1)
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{
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/* Very strange. */
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loadoff = 0;
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}
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dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val
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- loadoff);
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check_ptr (dynamic_strings);
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break;
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}
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}
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if (dynamic_strings == NULL)
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return 1;
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/* Now read the DT_NEEDED and DT_SONAME entries. */
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for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
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++dyn_entry)
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{
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if (dyn_entry->d_tag == DT_NEEDED || dyn_entry->d_tag == DT_SONAME)
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{
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char *name = dynamic_strings + dyn_entry->d_un.d_val;
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check_ptr (name);
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if (dyn_entry->d_tag == DT_NEEDED)
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{
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if (*flag == FLAG_ELF)
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{
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/* Check if this is enough to classify the binary. */
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for (j = 0;
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j < sizeof (known_libs) / sizeof (known_libs [0]);
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++j)
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if (strcmp (name, known_libs [j].soname) == 0)
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{
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*flag = known_libs [j].flag;
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break;
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}
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}
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}
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else if (dyn_entry->d_tag == DT_SONAME)
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*soname = xstrdup (name);
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/* Do we have everything we need? */
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if (*soname && *flag != FLAG_ELF)
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return 0;
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}
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}
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return 0;
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}
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