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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114// SPDX-License-Identifier: GPL-2.0
#include <linux/compat.h>#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 (is_compat_thread(task_thread_info(tsk))) 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)); ptrauth_keys_install_user(keys);
return 0;}
static u64 arg_to_enxx_mask(unsigned long arg){ u64 sctlr_enxx_mask = 0;
WARN_ON(arg & ~PR_PAC_ENABLED_KEYS_MASK); if (arg & PR_PAC_APIAKEY) sctlr_enxx_mask |= SCTLR_ELx_ENIA; if (arg & PR_PAC_APIBKEY) sctlr_enxx_mask |= SCTLR_ELx_ENIB; if (arg & PR_PAC_APDAKEY) sctlr_enxx_mask |= SCTLR_ELx_ENDA; if (arg & PR_PAC_APDBKEY) sctlr_enxx_mask |= SCTLR_ELx_ENDB; return sctlr_enxx_mask;}
int ptrauth_set_enabled_keys(struct task_struct *tsk, unsigned long keys, unsigned long enabled){ u64 sctlr;
if (!system_supports_address_auth()) return -EINVAL;
if (is_compat_thread(task_thread_info(tsk))) return -EINVAL;
if ((keys & ~PR_PAC_ENABLED_KEYS_MASK) || (enabled & ~keys)) return -EINVAL;
preempt_disable(); sctlr = tsk->thread.sctlr_user; sctlr &= ~arg_to_enxx_mask(keys); sctlr |= arg_to_enxx_mask(enabled); tsk->thread.sctlr_user = sctlr; if (tsk == current) update_sctlr_el1(sctlr); preempt_enable();
return 0;}
int ptrauth_get_enabled_keys(struct task_struct *tsk){ int retval = 0;
if (!system_supports_address_auth()) return -EINVAL;
if (is_compat_thread(task_thread_info(tsk))) return -EINVAL;
if (tsk->thread.sctlr_user & SCTLR_ELx_ENIA) retval |= PR_PAC_APIAKEY; if (tsk->thread.sctlr_user & SCTLR_ELx_ENIB) retval |= PR_PAC_APIBKEY; if (tsk->thread.sctlr_user & SCTLR_ELx_ENDA) retval |= PR_PAC_APDAKEY; if (tsk->thread.sctlr_user & SCTLR_ELx_ENDB) retval |= PR_PAC_APDBKEY;
return retval;}