projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ba830885 KM |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | #include <linux/errno.h> | |
| 4 | #include <linux/prctl.h> | |
| 5 | #include <linux/random.h> | |
| 6 | #include <linux/sched.h> | |
| 7 | #include <asm/cpufeature.h> | |
| 8 | #include <asm/pointer_auth.h> | |
| 9 | ||
| 10 | int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg) | |
| 11 | { | |
| 84931327 | 12 | struct ptrauth_keys *keys = &tsk->thread.keys_user; |
| ba830885 KM |
13 | unsigned long addr_key_mask = PR_PAC_APIAKEY | PR_PAC_APIBKEY | |
| 14 | PR_PAC_APDAKEY | PR_PAC_APDBKEY; | |
| 15 | unsigned long key_mask = addr_key_mask | PR_PAC_APGAKEY; | |
| 16 | ||
| 17 | if (!system_supports_address_auth() && !system_supports_generic_auth()) | |
| 18 | return -EINVAL; | |
| 19 | ||
| 20 | if (!arg) { | |
| 21 | ptrauth_keys_init(keys); | |
| 22 | ptrauth_keys_switch(keys); | |
| 23 | return 0; | |
| 24 | } | |
| 25 | ||
| 26 | if (arg & ~key_mask) | |
| 27 | return -EINVAL; | |
| 28 | ||
| 29 | if (((arg & addr_key_mask) && !system_supports_address_auth()) || | |
| 30 | ((arg & PR_PAC_APGAKEY) && !system_supports_generic_auth())) | |
| 31 | return -EINVAL; | |
| 32 | ||
| 33 | if (arg & PR_PAC_APIAKEY) | |
| 34 | get_random_bytes(&keys->apia, sizeof(keys->apia)); | |
| 35 | if (arg & PR_PAC_APIBKEY) | |
| 36 | get_random_bytes(&keys->apib, sizeof(keys->apib)); | |
| 37 | if (arg & PR_PAC_APDAKEY) | |
| 38 | get_random_bytes(&keys->apda, sizeof(keys->apda)); | |
| 39 | if (arg & PR_PAC_APDBKEY) | |
| 40 | get_random_bytes(&keys->apdb, sizeof(keys->apdb)); | |
| 41 | if (arg & PR_PAC_APGAKEY) | |
| 42 | get_random_bytes(&keys->apga, sizeof(keys->apga)); | |
| 43 | ||
| 44 | ptrauth_keys_switch(keys); | |
| 45 | ||
| 46 | return 0; | |
| 47 | } |