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/* Copyright (C) 2002, 2005 Red Hat, Inc.
Written by Jakub Jelinek <jakub@redhat.com>, 2002.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <alloca.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "prelinktab.h"
static int
undo_one (void **p, void *info)
{
struct prelink_entry *ent = * (struct prelink_entry **) p;
DSO *dso;
struct stat64 st;
struct prelink_link *hardlink;
char *move = NULL, *move_temp;
size_t movelen = 0;
if (ent->done != 2)
return 1;
if (ent->type != ET_DYN
&& (ent->type != ET_EXEC || libs_only))
return 1;
dso = open_dso (ent->canon_filename);
if (dso == NULL)
goto error_out;
if (fstat64 (dso->fd, &st) < 0)
{
error (0, errno, "%s changed during prelinking", ent->filename);
goto error_out;
}
if (st.st_dev != ent->dev || st.st_ino != ent->ino)
{
error (0, 0, "%s changed during prelinking", ent->filename);
goto error_out;
}
if (verbose)
{
if (dry_run)
printf ("Would undo %s\n", ent->canon_filename);
else
printf ("Undoing %s\n", ent->canon_filename);
}
if (prelink_undo (dso))
goto error_out;
if (dry_run)
close_dso (dso);
else
{
if (update_dso (dso, NULL))
{
dso = NULL;
goto error_out;
}
}
dso = NULL;
/* Redo hardlinks. */
for (hardlink = ent->hardlink; hardlink; hardlink = hardlink->next)
{
size_t len;
if (lstat64 (hardlink->canon_filename, &st) < 0)
{
error (0, 0, "Could not stat %s (former hardlink to %s)",
hardlink->canon_filename, ent->canon_filename);
continue;
}
if (st.st_dev != ent->dev || st.st_ino != ent->ino)
{
error (0, 0, "%s is no longer hardlink to %s",
hardlink->canon_filename, ent->canon_filename);
continue;
}
if (verbose)
{
if (dry_run)
printf ("Would link %s to %s\n", hardlink->canon_filename,
ent->canon_filename);
else
printf ("Linking %s to %s\n", hardlink->canon_filename,
ent->canon_filename);
}
len = strlen (hardlink->canon_filename);
if (len + sizeof (".#prelink#") > movelen)
{
movelen = len + sizeof (".#prelink#");
move_temp = move;
move = realloc (move, movelen);
if (move == NULL)
{
free(move_temp);
error (0, ENOMEM, "Could not hardlink %s to %s",
hardlink->canon_filename, ent->canon_filename);
movelen = 0;
continue;
}
}
memcpy (mempcpy (move, hardlink->canon_filename, len), ".#prelink#",
sizeof (".#prelink#"));
if (rename (hardlink->canon_filename, move) < 0)
{
error (0, errno, "Could not hardlink %s to %s",
hardlink->canon_filename, ent->canon_filename);
continue;
}
if (link (ent->canon_filename, hardlink->canon_filename) < 0)
{
error (0, errno, "Could not hardlink %s to %s",
hardlink->canon_filename, ent->canon_filename);
if (rename (move, hardlink->canon_filename) < 0)
{
error (0, errno, "Could not rename %s back to %s",
move, hardlink->canon_filename);
}
continue;
}
if (unlink (move) < 0)
{
error (0, errno, "Could not unlink %s", move);
continue;
}
}
free (move);
return 1;
error_out:
if (dso)
close_dso (dso);
(*(int *)info)++;
return 1;
}
int
undo_all (void)
{
int failures = 0;
htab_traverse (prelink_filename_htab, undo_one, &failures);
return failures != 0;
}
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