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CVE-2015-1333 add_key memory leak (rhbz 1244171)

This commit is contained in:
Josh Boyer 2015-07-27 10:44:28 -04:00
parent b942d8e16a
commit 86b8d46cbb
2 changed files with 49 additions and 1 deletions
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45
KEYS-ensure-we-free-the-assoc-array-edit-if-edit-is-.patch Normal file
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@ -0,0 +1,45 @@
From 3881b164810a564714dfdc16520b0fe538ae4bf7 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Mon, 27 Jul 2015 15:23:43 +0100
Subject: [PATCH] KEYS: ensure we free the assoc array edit if edit is valid
__key_link_end is not freeing the associated array edit structure
and this leads to a 512 byte memory leak each time an identical
existing key is added with add_key().
The reason the add_key() system call returns okay is that
key_create_or_update() calls __key_link_begin() before checking to see
whether it can update a key directly rather than adding/replacing - which
it turns out it can. Thus __key_link() is not called through
__key_instantiate_and_link() and __key_link_end() must cancel the edit.
CVE-2015-1333
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---
security/keys/keyring.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index e72548b5897e..d33437007ad2 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -1181,9 +1181,11 @@ void __key_link_end(struct key *keyring,
if (index_key->type == &key_type_keyring)
up_write(&keyring_serialise_link_sem);
- if (edit && !edit->dead_leaf) {
- key_payload_reserve(keyring,
- keyring->datalen - KEYQUOTA_LINK_BYTES);
+ if (edit) {
+ if (!edit->dead_leaf) {
+ key_payload_reserve(keyring,
+ keyring->datalen - KEYQUOTA_LINK_BYTES);
+ }
assoc_array_cancel_edit(edit);
}
up_write(&keyring->sem);
--
2.4.3

5
kernel.spec
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@ -584,7 +584,9 @@ Patch502: firmware-Drop-WARN-from-usermodehelper_read_trylock-.patch
Patch503: drm-i915-turn-off-wc-mmaps.patch
Patch504: kdbus.patch
Patch504: KEYS-ensure-we-free-the-assoc-array-edit-if-edit-is-.patch
Patch904: kdbus.patch
# END OF PATCH DEFINITIONS
@ -2023,6 +2025,7 @@ fi
%changelog
* Mon Jul 27 2015 Josh Boyer <jwboyer@fedoraproject.org> - 4.2.0-0.rc4.git0.1
- Linux v4.2-rc4
- CVE-2015-1333 add_key memory leak (rhbz 1244171)
- Disable debugging options.
* Fri Jul 24 2015 Josh Boyer <jwboyer@fedoraproject.org> - 4.2.0-0.rc3.git4.1