c9f838d104
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:
|
||
|---|---|---|
| .. | ||
| encrypted-keys | ||
| Kconfig | ||
| Makefile | ||
| big_key.c | ||
| compat.c | ||
| dh.c | ||
| gc.c | ||
| internal.h | ||
| key.c | ||
| keyctl.c | ||
| keyring.c | ||
| permission.c | ||
| persistent.c | ||
| proc.c | ||
| process_keys.c | ||
| request_key.c | ||
| request_key_auth.c | ||
| sysctl.c | ||
| trusted.c | ||
| trusted.h | ||
| user_defined.c | ||