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99 lines
2.9 KiB
99 lines
2.9 KiB
/* Conversion functions for notes.
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Copyright (C) 2007, 2009, 2014, 2018 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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static void
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elf_cvt_note (void *dest, const void *src, size_t len, int encode,
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bool nhdr8)
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{
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/* Note that the header is always the same size, but the padding
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differs for GNU Property notes. */
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assert (sizeof (Elf32_Nhdr) == sizeof (Elf64_Nhdr));
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while (len >= sizeof (Elf32_Nhdr))
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{
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/* Convert the header. */
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(1 ? Elf32_cvt_Nhdr : Elf64_cvt_Nhdr) (dest, src, sizeof (Elf32_Nhdr),
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encode);
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const Elf32_Nhdr *n = encode ? src : dest;
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size_t note_len = sizeof *n;
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/* desc needs to be aligned. */
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note_len += n->n_namesz;
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note_len = nhdr8 ? NOTE_ALIGN8 (note_len) : NOTE_ALIGN4 (note_len);
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if (note_len > len || note_len < sizeof *n)
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{
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/* Header was translated, nothing else. */
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len -= sizeof *n;
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src += sizeof *n;
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dest += sizeof *n;
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break;
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}
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/* data as a whole needs to be aligned. */
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note_len += n->n_descsz;
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note_len = nhdr8 ? NOTE_ALIGN8 (note_len) : NOTE_ALIGN4 (note_len);
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if (note_len > len || note_len < sizeof *n)
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{
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/* Header was translated, nothing else. */
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len -= sizeof *n;
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src += sizeof *n;
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dest += sizeof *n;
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break;
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}
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/* Copy or skip the note data. */
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size_t note_data_len = note_len - sizeof *n;
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src += sizeof *n;
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dest += sizeof *n;
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if (src != dest)
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memcpy (dest, src, note_data_len);
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src += note_data_len;
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dest += note_data_len;
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len -= note_len;
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}
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/* Copy over any leftover data unconverted. Probably part of
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truncated name/desc data. */
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if (unlikely (len > 0) && src != dest)
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memcpy (dest, src, len);
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}
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static void
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elf_cvt_note4 (void *dest, const void *src, size_t len, int encode)
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{
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elf_cvt_note (dest, src, len, encode, false);
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}
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static void
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elf_cvt_note8 (void *dest, const void *src, size_t len, int encode)
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{
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elf_cvt_note (dest, src, len, encode, true);
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}
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