diff options
| author | Eric Biggers <ebiggers@google.com> | 2017-04-18 15:31:09 +0100 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-05-20 19:05:37 +0200 |
| commit | 1035d5a1aa4f92bb37c1badb6e970051bace8fe6 (patch) | |
| tree | 825f39909b7d2294ecf737fba2034898468000c2 /kernel/trace | |
| parent | 2fb6ab951ff946a879d9128a81b9b960ffe511bd (diff) | |
KEYS: fix keyctl_set_reqkey_keyring() to not leak thread keyrings
commit c9f838d104fed6f2f61d68164712e3204bf5271b upstream.
This fixes CVE-2017-7472.
Running the following program as an unprivileged user exhausts kernel
memory by leaking thread keyrings:
#include <keyutils.h>
int main()
{
for (;;)
keyctl_set_reqkey_keyring(KEY_REQKEY_DEFL_THREAD_KEYRING);
}
Fix it by only creating a new thread keyring if there wasn't one before.
To make things more consistent, make install_thread_keyring_to_cred()
and install_process_keyring_to_cred() both return 0 if the corresponding
keyring is already present.
Fixes: d84f4f992cbd ("CRED: Inaugurate COW credentials")
Change-Id: I06eab1b34d56d23af7481f74d7b7a48887609dc7
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/trace')
0 files changed, 0 insertions, 0 deletions