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-rw-r--r--arch/arm64/kernel/process.c757
1 files changed, 757 insertions, 0 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
new file mode 100644
index 000000000..044a7d7f1
--- /dev/null
+++ b/arch/arm64/kernel/process.c
@@ -0,0 +1,757 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Based on arch/arm/kernel/process.c
+ *
+ * Original Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 1996-2000 Russell King - Converted to ARM.
+ * Copyright (C) 2012 ARM Ltd.
+ */
+#include <linux/compat.h>
+#include <linux/efi.h>
+#include <linux/elf.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
+#include <linux/kernel.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/nospec.h>
+#include <linux/stddef.h>
+#include <linux/sysctl.h>
+#include <linux/unistd.h>
+#include <linux/user.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/elfcore.h>
+#include <linux/pm.h>
+#include <linux/tick.h>
+#include <linux/utsname.h>
+#include <linux/uaccess.h>
+#include <linux/random.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/personality.h>
+#include <linux/notifier.h>
+#include <trace/events/power.h>
+#include <linux/percpu.h>
+#include <linux/thread_info.h>
+#include <linux/prctl.h>
+#include <linux/stacktrace.h>
+
+#include <asm/alternative.h>
+#include <asm/compat.h>
+#include <asm/cpufeature.h>
+#include <asm/cacheflush.h>
+#include <asm/exec.h>
+#include <asm/fpsimd.h>
+#include <asm/mmu_context.h>
+#include <asm/mte.h>
+#include <asm/processor.h>
+#include <asm/pointer_auth.h>
+#include <asm/stacktrace.h>
+#include <asm/switch_to.h>
+#include <asm/system_misc.h>
+
+#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __ro_after_init;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+/*
+ * Function pointers to optional machine specific functions
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL_GPL(pm_power_off);
+
+#ifdef CONFIG_HOTPLUG_CPU
+void arch_cpu_idle_dead(void)
+{
+ cpu_die();
+}
+#endif
+
+/*
+ * Called by kexec, immediately prior to machine_kexec().
+ *
+ * This must completely disable all secondary CPUs; simply causing those CPUs
+ * to execute e.g. a RAM-based pin loop is not sufficient. This allows the
+ * kexec'd kernel to use any and all RAM as it sees fit, without having to
+ * avoid any code or data used by any SW CPU pin loop. The CPU hotplug
+ * functionality embodied in smpt_shutdown_nonboot_cpus() to achieve this.
+ */
+void machine_shutdown(void)
+{
+ smp_shutdown_nonboot_cpus(reboot_cpu);
+}
+
+/*
+ * Halting simply requires that the secondary CPUs stop performing any
+ * activity (executing tasks, handling interrupts). smp_send_stop()
+ * achieves this.
+ */
+void machine_halt(void)
+{
+ local_irq_disable();
+ smp_send_stop();
+ while (1);
+}
+
+/*
+ * Power-off simply requires that the secondary CPUs stop performing any
+ * activity (executing tasks, handling interrupts). smp_send_stop()
+ * achieves this. When the system power is turned off, it will take all CPUs
+ * with it.
+ */
+void machine_power_off(void)
+{
+ local_irq_disable();
+ smp_send_stop();
+ do_kernel_power_off();
+}
+
+/*
+ * Restart requires that the secondary CPUs stop performing any activity
+ * while the primary CPU resets the system. Systems with multiple CPUs must
+ * provide a HW restart implementation, to ensure that all CPUs reset at once.
+ * This is required so that any code running after reset on the primary CPU
+ * doesn't have to co-ordinate with other CPUs to ensure they aren't still
+ * executing pre-reset code, and using RAM that the primary CPU's code wishes
+ * to use. Implementing such co-ordination would be essentially impossible.
+ */
+void machine_restart(char *cmd)
+{
+ /* Disable interrupts first */
+ local_irq_disable();
+ smp_send_stop();
+
+ /*
+ * UpdateCapsule() depends on the system being reset via
+ * ResetSystem().
+ */
+ if (efi_enabled(EFI_RUNTIME_SERVICES))
+ efi_reboot(reboot_mode, NULL);
+
+ /* Now call the architecture specific reboot code. */
+ do_kernel_restart(cmd);
+
+ /*
+ * Whoops - the architecture was unable to reboot.
+ */
+ printk("Reboot failed -- System halted\n");
+ while (1);
+}
+
+#define bstr(suffix, str) [PSR_BTYPE_ ## suffix >> PSR_BTYPE_SHIFT] = str
+static const char *const btypes[] = {
+ bstr(NONE, "--"),
+ bstr( JC, "jc"),
+ bstr( C, "-c"),
+ bstr( J , "j-")
+};
+#undef bstr
+
+static void print_pstate(struct pt_regs *regs)
+{
+ u64 pstate = regs->pstate;
+
+ if (compat_user_mode(regs)) {
+ printk("pstate: %08llx (%c%c%c%c %c %s %s %c%c%c %cDIT %cSSBS)\n",
+ pstate,
+ pstate & PSR_AA32_N_BIT ? 'N' : 'n',
+ pstate & PSR_AA32_Z_BIT ? 'Z' : 'z',
+ pstate & PSR_AA32_C_BIT ? 'C' : 'c',
+ pstate & PSR_AA32_V_BIT ? 'V' : 'v',
+ pstate & PSR_AA32_Q_BIT ? 'Q' : 'q',
+ pstate & PSR_AA32_T_BIT ? "T32" : "A32",
+ pstate & PSR_AA32_E_BIT ? "BE" : "LE",
+ pstate & PSR_AA32_A_BIT ? 'A' : 'a',
+ pstate & PSR_AA32_I_BIT ? 'I' : 'i',
+ pstate & PSR_AA32_F_BIT ? 'F' : 'f',
+ pstate & PSR_AA32_DIT_BIT ? '+' : '-',
+ pstate & PSR_AA32_SSBS_BIT ? '+' : '-');
+ } else {
+ const char *btype_str = btypes[(pstate & PSR_BTYPE_MASK) >>
+ PSR_BTYPE_SHIFT];
+
+ printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO %cTCO %cDIT %cSSBS BTYPE=%s)\n",
+ pstate,
+ pstate & PSR_N_BIT ? 'N' : 'n',
+ pstate & PSR_Z_BIT ? 'Z' : 'z',
+ pstate & PSR_C_BIT ? 'C' : 'c',
+ pstate & PSR_V_BIT ? 'V' : 'v',
+ pstate & PSR_D_BIT ? 'D' : 'd',
+ pstate & PSR_A_BIT ? 'A' : 'a',
+ pstate & PSR_I_BIT ? 'I' : 'i',
+ pstate & PSR_F_BIT ? 'F' : 'f',
+ pstate & PSR_PAN_BIT ? '+' : '-',
+ pstate & PSR_UAO_BIT ? '+' : '-',
+ pstate & PSR_TCO_BIT ? '+' : '-',
+ pstate & PSR_DIT_BIT ? '+' : '-',
+ pstate & PSR_SSBS_BIT ? '+' : '-',
+ btype_str);
+ }
+}
+
+void __show_regs(struct pt_regs *regs)
+{
+ int i, top_reg;
+ u64 lr, sp;
+
+ if (compat_user_mode(regs)) {
+ lr = regs->compat_lr;
+ sp = regs->compat_sp;
+ top_reg = 12;
+ } else {
+ lr = regs->regs[30];
+ sp = regs->sp;
+ top_reg = 29;
+ }
+
+ show_regs_print_info(KERN_DEFAULT);
+ print_pstate(regs);
+
+ if (!user_mode(regs)) {
+ printk("pc : %pS\n", (void *)regs->pc);
+ printk("lr : %pS\n", (void *)ptrauth_strip_insn_pac(lr));
+ } else {
+ printk("pc : %016llx\n", regs->pc);
+ printk("lr : %016llx\n", lr);
+ }
+
+ printk("sp : %016llx\n", sp);
+
+ if (system_uses_irq_prio_masking())
+ printk("pmr_save: %08llx\n", regs->pmr_save);
+
+ i = top_reg;
+
+ while (i >= 0) {
+ printk("x%-2d: %016llx", i, regs->regs[i]);
+
+ while (i-- % 3)
+ pr_cont(" x%-2d: %016llx", i, regs->regs[i]);
+
+ pr_cont("\n");
+ }
+}
+
+void show_regs(struct pt_regs *regs)
+{
+ __show_regs(regs);
+ dump_backtrace(regs, NULL, KERN_DEFAULT);
+}
+
+static void tls_thread_flush(void)
+{
+ write_sysreg(0, tpidr_el0);
+ if (system_supports_tpidr2())
+ write_sysreg_s(0, SYS_TPIDR2_EL0);
+
+ if (is_compat_task()) {
+ current->thread.uw.tp_value = 0;
+
+ /*
+ * We need to ensure ordering between the shadow state and the
+ * hardware state, so that we don't corrupt the hardware state
+ * with a stale shadow state during context switch.
+ */
+ barrier();
+ write_sysreg(0, tpidrro_el0);
+ }
+}
+
+static void flush_tagged_addr_state(void)
+{
+ if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI))
+ clear_thread_flag(TIF_TAGGED_ADDR);
+}
+
+void flush_thread(void)
+{
+ fpsimd_flush_thread();
+ tls_thread_flush();
+ flush_ptrace_hw_breakpoint(current);
+ flush_tagged_addr_state();
+}
+
+void arch_release_task_struct(struct task_struct *tsk)
+{
+ fpsimd_release_task(tsk);
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+ if (current->mm)
+ fpsimd_preserve_current_state();
+ *dst = *src;
+
+ /* We rely on the above assignment to initialize dst's thread_flags: */
+ BUILD_BUG_ON(!IS_ENABLED(CONFIG_THREAD_INFO_IN_TASK));
+
+ /*
+ * Detach src's sve_state (if any) from dst so that it does not
+ * get erroneously used or freed prematurely. dst's copies
+ * will be allocated on demand later on if dst uses SVE.
+ * For consistency, also clear TIF_SVE here: this could be done
+ * later in copy_process(), but to avoid tripping up future
+ * maintainers it is best not to leave TIF flags and buffers in
+ * an inconsistent state, even temporarily.
+ */
+ dst->thread.sve_state = NULL;
+ clear_tsk_thread_flag(dst, TIF_SVE);
+
+ /*
+ * In the unlikely event that we create a new thread with ZA
+ * enabled we should retain the ZA state so duplicate it here.
+ * This may be shortly freed if we exec() or if CLONE_SETTLS
+ * but it's simpler to do it here. To avoid confusing the rest
+ * of the code ensure that we have a sve_state allocated
+ * whenever za_state is allocated.
+ */
+ if (thread_za_enabled(&src->thread)) {
+ dst->thread.sve_state = kzalloc(sve_state_size(src),
+ GFP_KERNEL);
+ if (!dst->thread.sve_state)
+ return -ENOMEM;
+ dst->thread.za_state = kmemdup(src->thread.za_state,
+ za_state_size(src),
+ GFP_KERNEL);
+ if (!dst->thread.za_state) {
+ kfree(dst->thread.sve_state);
+ dst->thread.sve_state = NULL;
+ return -ENOMEM;
+ }
+ } else {
+ dst->thread.za_state = NULL;
+ clear_tsk_thread_flag(dst, TIF_SME);
+ }
+
+ /* clear any pending asynchronous tag fault raised by the parent */
+ clear_tsk_thread_flag(dst, TIF_MTE_ASYNC_FAULT);
+
+ return 0;
+}
+
+asmlinkage void ret_from_fork(void) asm("ret_from_fork");
+
+int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+ unsigned long clone_flags = args->flags;
+ unsigned long stack_start = args->stack;
+ unsigned long tls = args->tls;
+ struct pt_regs *childregs = task_pt_regs(p);
+
+ memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
+
+ /*
+ * In case p was allocated the same task_struct pointer as some
+ * other recently-exited task, make sure p is disassociated from
+ * any cpu that may have run that now-exited task recently.
+ * Otherwise we could erroneously skip reloading the FPSIMD
+ * registers for p.
+ */
+ fpsimd_flush_task_state(p);
+
+ ptrauth_thread_init_kernel(p);
+
+ if (likely(!args->fn)) {
+ *childregs = *current_pt_regs();
+ childregs->regs[0] = 0;
+
+ /*
+ * Read the current TLS pointer from tpidr_el0 as it may be
+ * out-of-sync with the saved value.
+ */
+ *task_user_tls(p) = read_sysreg(tpidr_el0);
+ if (system_supports_tpidr2())
+ p->thread.tpidr2_el0 = read_sysreg_s(SYS_TPIDR2_EL0);
+
+ if (stack_start) {
+ if (is_compat_thread(task_thread_info(p)))
+ childregs->compat_sp = stack_start;
+ else
+ childregs->sp = stack_start;
+ }
+
+ /*
+ * If a TLS pointer was passed to clone, use it for the new
+ * thread. We also reset TPIDR2 if it's in use.
+ */
+ if (clone_flags & CLONE_SETTLS) {
+ p->thread.uw.tp_value = tls;
+ p->thread.tpidr2_el0 = 0;
+ }
+ } else {
+ /*
+ * A kthread has no context to ERET to, so ensure any buggy
+ * ERET is treated as an illegal exception return.
+ *
+ * When a user task is created from a kthread, childregs will
+ * be initialized by start_thread() or start_compat_thread().
+ */
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->pstate = PSR_MODE_EL1h | PSR_IL_BIT;
+
+ p->thread.cpu_context.x19 = (unsigned long)args->fn;
+ p->thread.cpu_context.x20 = (unsigned long)args->fn_arg;
+ }
+ p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+ p->thread.cpu_context.sp = (unsigned long)childregs;
+ /*
+ * For the benefit of the unwinder, set up childregs->stackframe
+ * as the final frame for the new task.
+ */
+ p->thread.cpu_context.fp = (unsigned long)childregs->stackframe;
+
+ ptrace_hw_copy_thread(p);
+
+ return 0;
+}
+
+void tls_preserve_current_state(void)
+{
+ *task_user_tls(current) = read_sysreg(tpidr_el0);
+ if (system_supports_tpidr2() && !is_compat_task())
+ current->thread.tpidr2_el0 = read_sysreg_s(SYS_TPIDR2_EL0);
+}
+
+static void tls_thread_switch(struct task_struct *next)
+{
+ tls_preserve_current_state();
+
+ if (is_compat_thread(task_thread_info(next)))
+ write_sysreg(next->thread.uw.tp_value, tpidrro_el0);
+ else if (!arm64_kernel_unmapped_at_el0())
+ write_sysreg(0, tpidrro_el0);
+
+ write_sysreg(*task_user_tls(next), tpidr_el0);
+ if (system_supports_tpidr2())
+ write_sysreg_s(next->thread.tpidr2_el0, SYS_TPIDR2_EL0);
+}
+
+/*
+ * Force SSBS state on context-switch, since it may be lost after migrating
+ * from a CPU which treats the bit as RES0 in a heterogeneous system.
+ */
+static void ssbs_thread_switch(struct task_struct *next)
+{
+ /*
+ * Nothing to do for kernel threads, but 'regs' may be junk
+ * (e.g. idle task) so check the flags and bail early.
+ */
+ if (unlikely(next->flags & PF_KTHREAD))
+ return;
+
+ /*
+ * If all CPUs implement the SSBS extension, then we just need to
+ * context-switch the PSTATE field.
+ */
+ if (cpus_have_const_cap(ARM64_SSBS))
+ return;
+
+ spectre_v4_enable_task_mitigation(next);
+}
+
+/*
+ * We store our current task in sp_el0, which is clobbered by userspace. Keep a
+ * shadow copy so that we can restore this upon entry from userspace.
+ *
+ * This is *only* for exception entry from EL0, and is not valid until we
+ * __switch_to() a user task.
+ */
+DEFINE_PER_CPU(struct task_struct *, __entry_task);
+
+static void entry_task_switch(struct task_struct *next)
+{
+ __this_cpu_write(__entry_task, next);
+}
+
+/*
+ * ARM erratum 1418040 handling, affecting the 32bit view of CNTVCT.
+ * Ensure access is disabled when switching to a 32bit task, ensure
+ * access is enabled when switching to a 64bit task.
+ */
+static void erratum_1418040_thread_switch(struct task_struct *next)
+{
+ if (!IS_ENABLED(CONFIG_ARM64_ERRATUM_1418040) ||
+ !this_cpu_has_cap(ARM64_WORKAROUND_1418040))
+ return;
+
+ if (is_compat_thread(task_thread_info(next)))
+ sysreg_clear_set(cntkctl_el1, ARCH_TIMER_USR_VCT_ACCESS_EN, 0);
+ else
+ sysreg_clear_set(cntkctl_el1, 0, ARCH_TIMER_USR_VCT_ACCESS_EN);
+}
+
+static void erratum_1418040_new_exec(void)
+{
+ preempt_disable();
+ erratum_1418040_thread_switch(current);
+ preempt_enable();
+}
+
+/*
+ * __switch_to() checks current->thread.sctlr_user as an optimisation. Therefore
+ * this function must be called with preemption disabled and the update to
+ * sctlr_user must be made in the same preemption disabled block so that
+ * __switch_to() does not see the variable update before the SCTLR_EL1 one.
+ */
+void update_sctlr_el1(u64 sctlr)
+{
+ /*
+ * EnIA must not be cleared while in the kernel as this is necessary for
+ * in-kernel PAC. It will be cleared on kernel exit if needed.
+ */
+ sysreg_clear_set(sctlr_el1, SCTLR_USER_MASK & ~SCTLR_ELx_ENIA, sctlr);
+
+ /* ISB required for the kernel uaccess routines when setting TCF0. */
+ isb();
+}
+
+/*
+ * Thread switching.
+ */
+__notrace_funcgraph __sched
+struct task_struct *__switch_to(struct task_struct *prev,
+ struct task_struct *next)
+{
+ struct task_struct *last;
+
+ fpsimd_thread_switch(next);
+ tls_thread_switch(next);
+ hw_breakpoint_thread_switch(next);
+ contextidr_thread_switch(next);
+ entry_task_switch(next);
+ ssbs_thread_switch(next);
+ erratum_1418040_thread_switch(next);
+ ptrauth_thread_switch_user(next);
+
+ /*
+ * Complete any pending TLB or cache maintenance on this CPU in case
+ * the thread migrates to a different CPU.
+ * This full barrier is also required by the membarrier system
+ * call.
+ */
+ dsb(ish);
+
+ /*
+ * MTE thread switching must happen after the DSB above to ensure that
+ * any asynchronous tag check faults have been logged in the TFSR*_EL1
+ * registers.
+ */
+ mte_thread_switch(next);
+ /* avoid expensive SCTLR_EL1 accesses if no change */
+ if (prev->thread.sctlr_user != next->thread.sctlr_user)
+ update_sctlr_el1(next->thread.sctlr_user);
+
+ /* the actual thread switch */
+ last = cpu_switch_to(prev, next);
+
+ return last;
+}
+
+struct wchan_info {
+ unsigned long pc;
+ int count;
+};
+
+static bool get_wchan_cb(void *arg, unsigned long pc)
+{
+ struct wchan_info *wchan_info = arg;
+
+ if (!in_sched_functions(pc)) {
+ wchan_info->pc = pc;
+ return false;
+ }
+ return wchan_info->count++ < 16;
+}
+
+unsigned long __get_wchan(struct task_struct *p)
+{
+ struct wchan_info wchan_info = {
+ .pc = 0,
+ .count = 0,
+ };
+
+ if (!try_get_task_stack(p))
+ return 0;
+
+ arch_stack_walk(get_wchan_cb, &wchan_info, p, NULL);
+
+ put_task_stack(p);
+
+ return wchan_info.pc;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+ if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+ sp -= prandom_u32_max(PAGE_SIZE);
+ return sp & ~0xf;
+}
+
+#ifdef CONFIG_COMPAT
+int compat_elf_check_arch(const struct elf32_hdr *hdr)
+{
+ if (!system_supports_32bit_el0())
+ return false;
+
+ if ((hdr)->e_machine != EM_ARM)
+ return false;
+
+ if (!((hdr)->e_flags & EF_ARM_EABI_MASK))
+ return false;
+
+ /*
+ * Prevent execve() of a 32-bit program from a deadline task
+ * if the restricted affinity mask would be inadmissible on an
+ * asymmetric system.
+ */
+ return !static_branch_unlikely(&arm64_mismatched_32bit_el0) ||
+ !dl_task_check_affinity(current, system_32bit_el0_cpumask());
+}
+#endif
+
+/*
+ * Called from setup_new_exec() after (COMPAT_)SET_PERSONALITY.
+ */
+void arch_setup_new_exec(void)
+{
+ unsigned long mmflags = 0;
+
+ if (is_compat_task()) {
+ mmflags = MMCF_AARCH32;
+
+ /*
+ * Restrict the CPU affinity mask for a 32-bit task so that
+ * it contains only 32-bit-capable CPUs.
+ *
+ * From the perspective of the task, this looks similar to
+ * what would happen if the 64-bit-only CPUs were hot-unplugged
+ * at the point of execve(), although we try a bit harder to
+ * honour the cpuset hierarchy.
+ */
+ if (static_branch_unlikely(&arm64_mismatched_32bit_el0))
+ force_compatible_cpus_allowed_ptr(current);
+ } else if (static_branch_unlikely(&arm64_mismatched_32bit_el0)) {
+ relax_compatible_cpus_allowed_ptr(current);
+ }
+
+ current->mm->context.flags = mmflags;
+ ptrauth_thread_init_user();
+ mte_thread_init_user();
+ erratum_1418040_new_exec();
+
+ if (task_spec_ssb_noexec(current)) {
+ arch_prctl_spec_ctrl_set(current, PR_SPEC_STORE_BYPASS,
+ PR_SPEC_ENABLE);
+ }
+}
+
+#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
+/*
+ * Control the relaxed ABI allowing tagged user addresses into the kernel.
+ */
+static unsigned int tagged_addr_disabled;
+
+long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg)
+{
+ unsigned long valid_mask = PR_TAGGED_ADDR_ENABLE;
+ struct thread_info *ti = task_thread_info(task);
+
+ if (is_compat_thread(ti))
+ return -EINVAL;
+
+ if (system_supports_mte())
+ valid_mask |= PR_MTE_TCF_SYNC | PR_MTE_TCF_ASYNC \
+ | PR_MTE_TAG_MASK;
+
+ if (arg & ~valid_mask)
+ return -EINVAL;
+
+ /*
+ * Do not allow the enabling of the tagged address ABI if globally
+ * disabled via sysctl abi.tagged_addr_disabled.
+ */
+ if (arg & PR_TAGGED_ADDR_ENABLE && tagged_addr_disabled)
+ return -EINVAL;
+
+ if (set_mte_ctrl(task, arg) != 0)
+ return -EINVAL;
+
+ update_ti_thread_flag(ti, TIF_TAGGED_ADDR, arg & PR_TAGGED_ADDR_ENABLE);
+
+ return 0;
+}
+
+long get_tagged_addr_ctrl(struct task_struct *task)
+{
+ long ret = 0;
+ struct thread_info *ti = task_thread_info(task);
+
+ if (is_compat_thread(ti))
+ return -EINVAL;
+
+ if (test_ti_thread_flag(ti, TIF_TAGGED_ADDR))
+ ret = PR_TAGGED_ADDR_ENABLE;
+
+ ret |= get_mte_ctrl(task);
+
+ return ret;
+}
+
+/*
+ * Global sysctl to disable the tagged user addresses support. This control
+ * only prevents the tagged address ABI enabling via prctl() and does not
+ * disable it for tasks that already opted in to the relaxed ABI.
+ */
+
+static struct ctl_table tagged_addr_sysctl_table[] = {
+ {
+ .procname = "tagged_addr_disabled",
+ .mode = 0644,
+ .data = &tagged_addr_disabled,
+ .maxlen = sizeof(int),
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+ { }
+};
+
+static int __init tagged_addr_init(void)
+{
+ if (!register_sysctl("abi", tagged_addr_sysctl_table))
+ return -EINVAL;
+ return 0;
+}
+
+core_initcall(tagged_addr_init);
+#endif /* CONFIG_ARM64_TAGGED_ADDR_ABI */
+
+#ifdef CONFIG_BINFMT_ELF
+int arch_elf_adjust_prot(int prot, const struct arch_elf_state *state,
+ bool has_interp, bool is_interp)
+{
+ /*
+ * For dynamically linked executables the interpreter is
+ * responsible for setting PROT_BTI on everything except
+ * itself.
+ */
+ if (is_interp != has_interp)
+ return prot;
+
+ if (!(state->flags & ARM64_ELF_BTI))
+ return prot;
+
+ if (prot & PROT_EXEC)
+ prot |= PROT_BTI;
+
+ return prot;
+}
+#endif