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authorFlorian Weimer <fweimer@redhat.com>2017-06-19 22:32:12 +0200
committerFlorian Weimer <fweimer@redhat.com>2017-06-19 22:44:08 +0200
commitc69d4a0f680a24fdbe323764a50382ad324041e9 (patch)
treec70924b0816fa0f46b12dd1608c299fb2c146ff2
parent46703a3995aa3ca2b816814aa4ad05ed524194dd (diff)
downloadglibc-c69d4a0f680a24fdbe323764a50382ad324041e9.tar.gz
ld.so: Reject overly long LD_AUDIT path elements
Also only process the last LD_AUDIT entry. (cherry picked from commit 81b82fb966ffbd94353f793ad17116c6088dedd9)
-rw-r--r--ChangeLog11
-rw-r--r--elf/rtld.c110
2 files changed, 106 insertions, 15 deletions
diff --git a/ChangeLog b/ChangeLog
index fbe4db2cf7..67ce0aa4de 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
2017-06-19 Florian Weimer <fweimer@redhat.com>
+ * elf/rtld.c (audit_list_string): New variable.
+ (audit_list): Update comment.
+ (struct audit_list_iter): Define.
+ (audit_list_iter_init, audit_list_iter_next): New function.
+ (dl_main): Use struct audit_list_iter to process audit modules.
+ (process_dl_audit): Call dso_name_valid_for_suid.
+ (process_envvars): Set audit_list_string instead of calling
+ process_dl_audit.
+
+2017-06-19 Florian Weimer <fweimer@redhat.com>
+
* elf/rtld.c (SECURE_NAME_LIMIT, SECURE_PATH_LIMIT): Define.
(dso_name_valid_for_suid): New function.
(handle_ld_preload): Likewise.
diff --git a/elf/rtld.c b/elf/rtld.c
index 4badcf6590..369724babe 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -129,13 +129,91 @@ dso_name_valid_for_suid (const char *p)
return *p != '\0';
}
-/* List of auditing DSOs. */
+/* LD_AUDIT variable contents. Must be processed before the
+ audit_list below. */
+const char *audit_list_string;
+
+/* Cyclic list of auditing DSOs. audit_list->next is the first
+ element. */
static struct audit_list
{
const char *name;
struct audit_list *next;
} *audit_list;
+/* Iterator for audit_list_string followed by audit_list. */
+struct audit_list_iter
+{
+ /* Tail of audit_list_string still needing processing, or NULL. */
+ const char *audit_list_tail;
+
+ /* The list element returned in the previous iteration. NULL before
+ the first element. */
+ struct audit_list *previous;
+
+ /* Scratch buffer for returning a name which is part of
+ audit_list_string. */
+ char fname[SECURE_NAME_LIMIT];
+};
+
+/* Initialize an audit list iterator. */
+static void
+audit_list_iter_init (struct audit_list_iter *iter)
+{
+ iter->audit_list_tail = audit_list_string;
+ iter->previous = NULL;
+}
+
+/* Iterate through both audit_list_string and audit_list. */
+static const char *
+audit_list_iter_next (struct audit_list_iter *iter)
+{
+ if (iter->audit_list_tail != NULL)
+ {
+ /* First iterate over audit_list_string. */
+ while (*iter->audit_list_tail != '\0')
+ {
+ /* Split audit list at colon. */
+ size_t len = strcspn (iter->audit_list_tail, ":");
+ if (len > 0 && len < sizeof (iter->fname))
+ {
+ memcpy (iter->fname, iter->audit_list_tail, len);
+ iter->fname[len] = '\0';
+ }
+ else
+ /* Do not return this name to the caller. */
+ iter->fname[0] = '\0';
+
+ /* Skip over the substring and the following delimiter. */
+ iter->audit_list_tail += len;
+ if (*iter->audit_list_tail == ':')
+ ++iter->audit_list_tail;
+
+ /* If the name is valid, return it. */
+ if (dso_name_valid_for_suid (iter->fname))
+ return iter->fname;
+ /* Otherwise, wrap around and try the next name. */
+ }
+ /* Fall through to the procesing of audit_list. */
+ }
+
+ if (iter->previous == NULL)
+ {
+ if (audit_list == NULL)
+ /* No pre-parsed audit list. */
+ return NULL;
+ /* Start of audit list. The first list element is at
+ audit_list->next (cyclic list). */
+ iter->previous = audit_list->next;
+ return iter->previous->name;
+ }
+ if (iter->previous == audit_list)
+ /* Cyclic list wrap-around. */
+ return NULL;
+ iter->previous = iter->previous->next;
+ return iter->previous->name;
+}
+
#ifndef HAVE_INLINED_SYSCALLS
/* Set nonzero during loading and initialization of executable and
libraries, cleared before the executable's entry point runs. This
@@ -1303,11 +1381,13 @@ of this helper program; chances are you did not intend to run this program.\n\
GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid ();
/* If we have auditing DSOs to load, do it now. */
- if (__glibc_unlikely (audit_list != NULL))
+ bool need_security_init = true;
+ if (__glibc_unlikely (audit_list != NULL)
+ || __glibc_unlikely (audit_list_string != NULL))
{
- /* Iterate over all entries in the list. The order is important. */
struct audit_ifaces *last_audit = NULL;
- struct audit_list *al = audit_list->next;
+ struct audit_list_iter al_iter;
+ audit_list_iter_init (&al_iter);
/* Since we start using the auditing DSOs right away we need to
initialize the data structures now. */
@@ -1318,9 +1398,14 @@ of this helper program; chances are you did not intend to run this program.\n\
use different values (especially the pointer guard) and will
fail later on. */
security_init ();
+ need_security_init = false;
- do
+ while (true)
{
+ const char *name = audit_list_iter_next (&al_iter);
+ if (name == NULL)
+ break;
+
int tls_idx = GL(dl_tls_max_dtv_idx);
/* Now it is time to determine the layout of the static TLS
@@ -1329,7 +1414,7 @@ of this helper program; chances are you did not intend to run this program.\n\
no DF_STATIC_TLS bit is set. The reason is that we know
glibc will use the static model. */
struct dlmopen_args dlmargs;
- dlmargs.fname = al->name;
+ dlmargs.fname = name;
dlmargs.map = NULL;
const char *objname;
@@ -1342,7 +1427,7 @@ of this helper program; chances are you did not intend to run this program.\n\
not_loaded:
_dl_error_printf ("\
ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
- al->name, err_str);
+ name, err_str);
if (malloced)
free ((char *) err_str);
}
@@ -1446,10 +1531,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
goto not_loaded;
}
}
-
- al = al->next;
}
- while (al != audit_list->next);
/* If we have any auditing modules, announce that we already
have two objects loaded. */
@@ -1713,7 +1795,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
if (tcbp == NULL)
tcbp = init_tls ();
- if (__glibc_likely (audit_list == NULL))
+ if (__glibc_likely (need_security_init))
/* Initialize security features. But only if we have not done it
earlier. */
security_init ();
@@ -2344,9 +2426,7 @@ process_dl_audit (char *str)
char *p;
while ((p = (strsep) (&str, ":")) != NULL)
- if (p[0] != '\0'
- && (__builtin_expect (! __libc_enable_secure, 1)
- || strchr (p, '/') == NULL))
+ if (dso_name_valid_for_suid (p))
{
/* This is using the local malloc, not the system malloc. The
memory can never be freed. */
@@ -2410,7 +2490,7 @@ process_envvars (enum mode *modep)
break;
}
if (memcmp (envline, "AUDIT", 5) == 0)
- process_dl_audit (&envline[6]);
+ audit_list_string = &envline[6];
break;
case 7: