45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/prctl.h>
|
|
#include <linux/random.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/pointer_auth.h>
|
|
|
|
int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg)
|
|
{
|
|
struct ptrauth_keys_user *keys = &tsk->thread.keys_user;
|
|
unsigned long addr_key_mask = PR_PAC_APIAKEY | PR_PAC_APIBKEY |
|
|
PR_PAC_APDAKEY | PR_PAC_APDBKEY;
|
|
unsigned long key_mask = addr_key_mask | PR_PAC_APGAKEY;
|
|
|
|
if (!system_supports_address_auth() && !system_supports_generic_auth())
|
|
return -EINVAL;
|
|
|
|
if (!arg) {
|
|
ptrauth_keys_init_user(keys);
|
|
return 0;
|
|
}
|
|
|
|
if (arg & ~key_mask)
|
|
return -EINVAL;
|
|
|
|
if (((arg & addr_key_mask) && !system_supports_address_auth()) ||
|
|
((arg & PR_PAC_APGAKEY) && !system_supports_generic_auth()))
|
|
return -EINVAL;
|
|
|
|
if (arg & PR_PAC_APIAKEY)
|
|
get_random_bytes(&keys->apia, sizeof(keys->apia));
|
|
if (arg & PR_PAC_APIBKEY)
|
|
get_random_bytes(&keys->apib, sizeof(keys->apib));
|
|
if (arg & PR_PAC_APDAKEY)
|
|
get_random_bytes(&keys->apda, sizeof(keys->apda));
|
|
if (arg & PR_PAC_APDBKEY)
|
|
get_random_bytes(&keys->apdb, sizeof(keys->apdb));
|
|
if (arg & PR_PAC_APGAKEY)
|
|
get_random_bytes(&keys->apga, sizeof(keys->apga));
|
|
|
|
return 0;
|
|
}
|