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* elf/dl-load.c (fillin_rpath): Only check for trusted directories
	when adding new entries.
This commit is contained in:
Ulrich Drepper 2000-08-31 00:20:09 +00:00
parent 32ee8d952f
commit 4a6d11984d
2 changed files with 51 additions and 42 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2000-08-30 Ulrich Drepper <drepper@redhat.com>
* elf/dl-load.c (fillin_rpath): Only check for trusted directories
when adding new entries.
* elf/dl-load.c (fillin_rpath): Make local copy of where string
since the object being loaded can be unloaded.

90
elf/dl-load.c
View File

@ -126,6 +126,8 @@ static const size_t system_dirs_len[] =
{
SYSTEM_DIRS_LEN
};
#define nsystem_dirs_len \
(sizeof (system_dirs_len) / sizeof (system_dirs_len[0]))
/* Local version of `strdup' function. */
@ -362,32 +364,6 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
if (len > 0 && cp[len - 1] != '/')
cp[len++] = '/';
/* Make sure we don't use untrusted directories if we run SUID. */
if (check_trusted)
{
const char *trun = system_dirs;
size_t idx;
/* All trusted directories must be complete names. */
if (cp[0] != '/')
continue;
for (idx = 0;
idx < sizeof (system_dirs_len) / sizeof (system_dirs_len[0]);
++idx)
{
if (len == system_dirs_len[idx] && memcmp (trun, cp, len) == 0)
/* Found it. */
break;
trun += system_dirs_len[idx] + 1;
}
if (idx == sizeof (system_dirs_len) / sizeof (system_dirs_len[0]))
/* It's no trusted directory, skip it. */
continue;
}
/* See if this directory is already known. */
for (dirp = all_dirs; dirp != NULL; dirp = dirp->next)
if (dirp->dirnamelen == len && memcmp (cp, dirp->dirname, len) == 0)
@ -408,7 +384,7 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
{
size_t cnt;
enum r_dir_status init_val;
size_t where_len = strlen (where) + 1;
size_t where_len = where ? strlen (where) + 1 : 0;
/* It's a new directory. Create an entry and add it. */
dirp = (struct r_search_path_elem *)
@ -424,17 +400,51 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
if (len > max_dirnamelen)
max_dirnamelen = len;
/* We have to make sure all the relative directories are never
ignored. The current directory might change and all our
saved information would be void. */
init_val = cp[0] != '/' ? existing : unknown;
/* Make sure we don't use untrusted directories if we run SUID. */
if (__builtin_expect (check_trusted, 0))
{
const char *trun = system_dirs;
size_t idx;
/* By default we don't trust anything. */
init_val = nonexisting;
/* All trusted directories must be complete names. */
if (cp[0] == '/')
{
for (idx = 0; idx < nsystem_dirs_len; ++idx)
{
if (len == system_dirs_len[idx]
&& memcmp (trun, cp, len) == 0)
/* Found it. */
break;
trun += system_dirs_len[idx] + 1;
}
if (idx < nsystem_dirs_len)
/* It's a trusted directory so allow checking for it. */
init_val = unknown;
}
}
else
/* We don't have to check for trusted directories and can
accept everything. We have to make sure all the
relative directories are never ignored. The current
directory might change and all our saved information
would be void. */
init_val = cp[0] != '/' ? existing : unknown;
for (cnt = 0; cnt < ncapstr; ++cnt)
dirp->status[cnt] = init_val;
dirp->what = what;
dirp->where = memcpy ((char *) dirp + sizeof (*dirp)
+ ncapstr * sizeof (enum r_dir_status),
where, where_len);
if (__builtin_expect (where != NULL, 1))
dirp->where = memcpy ((char *) dirp + sizeof (*dirp)
+ ncapstr * sizeof (enum r_dir_status),
where, where_len);
else
dirp->where = NULL;
dirp->next = all_dirs;
all_dirs = dirp;
@ -531,8 +541,7 @@ _dl_init_paths (const char *llp)
/* First set up the rest of the default search directory entries. */
aelem = rtld_search_dirs = (struct r_search_path_elem **)
malloc ((sizeof (system_dirs_len) / sizeof (system_dirs_len[0]) + 1)
* sizeof (struct r_search_path_elem *));
malloc ((nsystem_dirs_len + 1) * sizeof (struct r_search_path_elem *));
if (rtld_search_dirs == NULL)
_dl_signal_error (ENOMEM, NULL, N_("cannot create search path array"));
@ -570,13 +579,11 @@ _dl_init_paths (const char *llp)
for (cnt = 0; cnt < ncapstr; ++cnt)
pelem->status[cnt] = unknown;
pelem->next = (++idx == (sizeof (system_dirs_len)
/ sizeof (system_dirs_len[0]))
? NULL : (pelem + round_size));
pelem->next = (++idx == nsystem_dirs_len ? NULL : (pelem + round_size));
pelem += round_size;
}
while (idx < sizeof (system_dirs_len) / sizeof (system_dirs_len[0]));
while (idx < nsystem_dirs_len);
max_dirnamelen = SYSTEM_DIRS_MAX_LEN;
*aelem = NULL;
@ -1506,8 +1513,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
dirp += system_dirs_len[cnt] + 1;
++cnt;
}
while (cnt < (sizeof (system_dirs_len)
/ sizeof (system_dirs_len[0])));
while (cnt < nsystem_dirs_len);
}
if (cached)