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