diff options
Diffstat (limited to 'gnu/packages/patches/gnutls-CVE-2021-20231.patch')
| -rw-r--r-- | gnu/packages/patches/gnutls-CVE-2021-20231.patch | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gnu/packages/patches/gnutls-CVE-2021-20231.patch b/gnu/packages/patches/gnutls-CVE-2021-20231.patch new file mode 100644 index 0000000000..5186522eee --- /dev/null +++ b/gnu/packages/patches/gnutls-CVE-2021-20231.patch @@ -0,0 +1,62 @@ +From 15beb4b193b2714d88107e7dffca781798684e7e Mon Sep 17 00:00:00 2001 +From: Daiki Ueno <ueno@gnu.org> +Date: Fri, 29 Jan 2021 14:06:05 +0100 +Subject: [PATCH 1/2] key_share: avoid use-after-free around realloc + +Signed-off-by: Daiki Ueno <ueno@gnu.org> +--- + lib/ext/key_share.c | 12 +++++------- + 1 file changed, 5 insertions(+), 7 deletions(-) + +diff --git a/lib/ext/key_share.c b/lib/ext/key_share.c +index ab8abf8fe..a8c4bb5cf 100644 +--- a/lib/ext/key_share.c ++++ b/lib/ext/key_share.c +@@ -664,14 +664,14 @@ key_share_send_params(gnutls_session_t session, + { + unsigned i; + int ret; +- unsigned char *lengthp; +- unsigned int cur_length; + unsigned int generated = 0; + const gnutls_group_entry_st *group; + const version_entry_st *ver; + + /* this extension is only being sent on client side */ + if (session->security_parameters.entity == GNUTLS_CLIENT) { ++ unsigned int length_pos; ++ + ver = _gnutls_version_max(session); + if (unlikely(ver == NULL || ver->key_shares == 0)) + return 0; +@@ -679,16 +679,13 @@ key_share_send_params(gnutls_session_t session, + if (!have_creds_for_tls13(session)) + return 0; + +- /* write the total length later */ +- lengthp = &extdata->data[extdata->length]; ++ length_pos = extdata->length; + + ret = + _gnutls_buffer_append_prefix(extdata, 16, 0); + if (ret < 0) + return gnutls_assert_val(ret); + +- cur_length = extdata->length; +- + if (session->internals.hsk_flags & HSK_HRR_RECEIVED) { /* we know the group */ + group = get_group(session); + if (unlikely(group == NULL)) +@@ -736,7 +733,8 @@ key_share_send_params(gnutls_session_t session, + } + + /* copy actual length */ +- _gnutls_write_uint16(extdata->length - cur_length, lengthp); ++ _gnutls_write_uint16(extdata->length - length_pos - 2, ++ &extdata->data[length_pos]); + + } else { /* server */ + ver = get_version(session); +-- +2.30.2 + |