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elfcopy: copy raw (untranslated) contents to binary output

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Previously elfcopy used elf_getdata to obtain data from ELF sections
being copied to binary output, but elf_getdata returns data that has
been translated - that is, data is in host byte order. When the host and
target differ in endianness (e.g., converting a big-endian MIPS ELF
object to binary on an x86 host) this resulted in byte-swapped data in
certain sections such as .dynamic.

Instead use elf_rawdata to keep data in the original, target endianness.

Reported by:	Hiroki Mori <yamori83@yahoo.co.jp>, Bill Yuan
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2018-01-02 14:07:55 +00:00
parent 7d3df1907a
commit aadb68849f
1 changed files with 2 additions and 2 deletions
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4
contrib/elftoolchain/elfcopy/binary.c
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@ -101,10 +101,10 @@ create_binary(int ifd, int ofd)
sh.sh_size == 0)
continue;
(void) elf_errno();
if ((d = elf_getdata(scn, NULL)) == NULL) {
if ((d = elf_rawdata(scn, NULL)) == NULL) {
elferr = elf_errno();
if (elferr != 0)
warnx("elf_getdata failed: %s", elf_errmsg(-1));
warnx("elf_rawdata failed: %s", elf_errmsg(-1));
continue;
}
if (d->d_buf == NULL || d->d_size == 0)