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Harden tls_dtor_list with pointer mangling [BZ #19018]

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This commit is contained in:
Florian Weimer 2015-10-06 13:12:36 +02:00
parent be64c2ef2a
commit f586e13286
3 changed files with 18 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2015-10-06 Florian Weimer <fweimer@redhat.com>
[BZ #19018]
* stdlib/cxa_thread_atexit_impl.c (__cxa_thread_atexit_impl):
Mangle function pointer before storing it.
(__call_tls_dtors): Demangle function pointer before calling it.
2015-10-05 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #19012]

4
NEWS
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@ -17,8 +17,8 @@ Version 2.23
18757, 18778, 18781, 18787, 18789, 18790, 18795, 18796, 18803, 18820,
18823, 18824, 18825, 18857, 18863, 18870, 18872, 18873, 18875, 18887,
18921, 18951, 18952, 18956, 18961, 18966, 18967, 18969, 18970, 18977,
18980, 18981, 18985, 19003, 19012, 19016, 19032, 19046, 19049, 19050,
19059, 19071.
18980, 18981, 18985, 19003, 19012, 19016, 19018, 19032, 19046, 19049,
19050, 19059, 19071.
* The obsolete header <regexp.h> has been removed. Programs that require
this header must be updated to use <regex.h> instead.

10
stdlib/cxa_thread_atexit_impl.c
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@ -98,6 +98,10 @@ static __thread struct link_map *lm_cache;
int
__cxa_thread_atexit_impl (dtor_func func, void *obj, void *dso_symbol)
{
#ifdef PTR_MANGLE
PTR_MANGLE (func);
#endif
/* Prepend. */
struct dtor_list *new = calloc (1, sizeof (struct dtor_list));
new->func = func;
@ -142,9 +146,13 @@ __call_tls_dtors (void)
while (tls_dtor_list)
{
struct dtor_list *cur = tls_dtor_list;
dtor_func func = cur->func;
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (func);
#endif
tls_dtor_list = tls_dtor_list->next;
cur->func (cur->obj);
func (cur->obj);
/* Ensure that the MAP dereference happens before
l_tls_dtor_count decrement. That way, we protect this access from a