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