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| author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2013-10-25 10:22:12 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2013-10-25 10:22:12 +0530 |
| commit | 7cbcdb3699584db8913ca90f705d6337633ee10f (patch) | |
| tree | a260a3b6afb62ce20602c0672b6ea040e4db2c8c | |
| parent | 894f3f1049135dcbeaab8f18690973663ef3147c (diff) | |
| download | glibc-7cbcdb3699584db8913ca90f705d6337633ee10f.zip glibc-7cbcdb3699584db8913ca90f705d6337633ee10f.tar.gz glibc-7cbcdb3699584db8913ca90f705d6337633ee10f.tar.bz2 | |
Fix stack overflow due to large AF_INET6 requests
Resolves #16072 (CVE-2013-4458).
This patch fixes another stack overflow in getaddrinfo when it is
called with AF_INET6. The AF_UNSPEC case was fixed as CVE-2013-1914,
but the AF_INET6 case went undetected back then.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | NEWS | 5 | ||||
| -rw-r--r-- | sysdeps/posix/getaddrinfo.c | 20 |
3 files changed, 28 insertions, 3 deletions
@@ -1,3 +1,9 @@ +2013-10-25 Siddhesh Poyarekar <siddhesh@redhat.com> + + [BZ #16072] + * sysdeps/posix/getaddrinfo.c (gethosts): Allocate tmpbuf on + heap for large requests. + 2013-10-25 Aurelien Jarno <aurelien@aurel32.net> [BZ #9954] @@ -15,7 +15,7 @@ Version 2.19 15734, 15735, 15736, 15748, 15749, 15754, 15760, 15764, 15797, 15825, 15844, 15847, 15849, 15855, 15856, 15857, 15859, 15867, 15886, 15887, 15890, 15892, 15893, 15895, 15897, 15905, 15909, 15919, 15921, 15923, - 15939, 15948, 15963, 15966, 15988, 16032, 16034, 16036, 16041. + 15939, 15948, 15963, 15966, 15988, 16032, 16034, 16036, 16041, 16072. * CVE-2012-4412 The strcoll implementation caches indices and rules for large collation sequences to optimize multiple passes. This cache @@ -44,6 +44,9 @@ Version 2.19 heap when passed very large allocation size values (Bugzilla #15855, #15856, #15857). +* CVE-2013-4458 Stack overflow in getaddrinfo with large number of results + for AF_INET6 has been fixed (Bugzilla #16072). + * New locales: ak_GH, cmn_TW, hak_TW, lzh_TW, nan_TW, quz_PE, pap_AW, pap_CW, ar_SS. diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index e6ce4cf..8ff74b4 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -197,7 +197,22 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, &rc, &herrno, NULL, &localcanon)); \ if (rc != ERANGE || herrno != NETDB_INTERNAL) \ break; \ - tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \ + if (!malloc_tmpbuf && __libc_use_alloca (alloca_used + 2 * tmpbuflen)) \ + tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen, 2 * tmpbuflen, \ + alloca_used); \ + else \ + { \ + char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL, \ + 2 * tmpbuflen); \ + if (newp == NULL) \ + { \ + result = -EAI_MEMORY; \ + goto free_and_return; \ + } \ + tmpbuf = newp; \ + malloc_tmpbuf = true; \ + tmpbuflen = 2 * tmpbuflen; \ + } \ } \ if (status == NSS_STATUS_SUCCESS && rc == 0) \ h = &th; \ @@ -209,7 +224,8 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, { \ __set_h_errno (herrno); \ _res.options |= old_res_options & RES_USE_INET6; \ - return -EAI_SYSTEM; \ + result = -EAI_SYSTEM; \ + goto free_and_return; \ } \ if (herrno == TRY_AGAIN) \ no_data = EAI_AGAIN; \ |