diff options
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/asm-offsets.c | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 8 | ||||
| -rw-r--r-- | arch/arm64/kernel/entry-common.c | 36 | ||||
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 5 | ||||
| -rw-r--r-- | arch/arm64/kernel/hw_breakpoint.c | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/image-vars.h | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/pi/kaslr_early.c | 11 | ||||
| -rw-r--r-- | arch/arm64/kernel/probes/kprobes.c | 21 | ||||
| -rw-r--r-- | arch/arm64/kernel/probes/kprobes_trampoline.S | 78 | ||||
| -rw-r--r-- | arch/arm64/kernel/process.c | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/ptrace.c | 8 | ||||
| -rw-r--r-- | arch/arm64/kernel/setup.c | 5 | ||||
| -rw-r--r-- | arch/arm64/kernel/signal.c | 39 | ||||
| -rw-r--r-- | arch/arm64/kernel/syscall.c | 5 |
14 files changed, 83 insertions, 143 deletions
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index 5a7dbbe0ce63..81496083c041 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -75,8 +75,8 @@ int main(void) DEFINE(S_FP, offsetof(struct pt_regs, regs[29])); DEFINE(S_LR, offsetof(struct pt_regs, regs[30])); DEFINE(S_SP, offsetof(struct pt_regs, sp)); - DEFINE(S_PSTATE, offsetof(struct pt_regs, pstate)); DEFINE(S_PC, offsetof(struct pt_regs, pc)); + DEFINE(S_PSTATE, offsetof(struct pt_regs, pstate)); DEFINE(S_SYSCALLNO, offsetof(struct pt_regs, syscallno)); DEFINE(S_SDEI_TTBR1, offsetof(struct pt_regs, sdei_ttbr1)); DEFINE(S_PMR_SAVE, offsetof(struct pt_regs, pmr_save)); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index aefda789f510..6e1cca7b2098 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -3124,13 +3124,9 @@ static void __init enable_cpu_capabilities(u16 scope_mask) boot_scope = !!(scope_mask & SCOPE_BOOT_CPU); for (i = 0; i < ARM64_NCAPS; i++) { - unsigned int num; - caps = cpucap_ptrs[i]; - if (!caps || !(caps->type & scope_mask)) - continue; - num = caps->capability; - if (!cpus_have_cap(num)) + if (!caps || !(caps->type & scope_mask) || + !cpus_have_cap(caps->capability)) continue; if (boot_scope && caps->cpu_enable) diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 0fc94207e69a..b77a15955f28 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -10,6 +10,7 @@ #include <linux/linkage.h> #include <linux/lockdep.h> #include <linux/ptrace.h> +#include <linux/resume_user_mode.h> #include <linux/sched.h> #include <linux/sched/debug.h> #include <linux/thread_info.h> @@ -126,16 +127,49 @@ static __always_inline void __exit_to_user_mode(void) lockdep_hardirqs_on(CALLER_ADDR0); } +static void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags) +{ + do { + local_irq_enable(); + + if (thread_flags & _TIF_NEED_RESCHED) + schedule(); + + if (thread_flags & _TIF_UPROBE) + uprobe_notify_resume(regs); + + if (thread_flags & _TIF_MTE_ASYNC_FAULT) { + clear_thread_flag(TIF_MTE_ASYNC_FAULT); + send_sig_fault(SIGSEGV, SEGV_MTEAERR, + (void __user *)NULL, current); + } + + if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) + do_signal(regs); + + if (thread_flags & _TIF_NOTIFY_RESUME) + resume_user_mode_work(regs); + + if (thread_flags & _TIF_FOREIGN_FPSTATE) + fpsimd_restore_current_state(); + + local_irq_disable(); + thread_flags = read_thread_flags(); + } while (thread_flags & _TIF_WORK_MASK); +} + static __always_inline void exit_to_user_mode_prepare(struct pt_regs *regs) { unsigned long flags; - local_daif_mask(); + local_irq_disable(); flags = read_thread_flags(); if (unlikely(flags & _TIF_WORK_MASK)) do_notify_resume(regs, flags); + local_daif_mask(); + lockdep_sys_exit(); } diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 8e24b5e5e192..0cd2bfb38bb0 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1146,6 +1146,8 @@ void cpu_enable_sve(const struct arm64_cpu_capabilities *__always_unused p) { write_sysreg(read_sysreg(CPACR_EL1) | CPACR_EL1_ZEN_EL1EN, CPACR_EL1); isb(); + + write_sysreg_s(0, SYS_ZCR_EL1); } void __init sve_setup(void) @@ -1257,6 +1259,9 @@ void cpu_enable_sme(const struct arm64_cpu_capabilities *__always_unused p) write_sysreg(read_sysreg(CPACR_EL1) | CPACR_EL1_SMEN_EL1EN, CPACR_EL1); isb(); + /* Ensure all bits in SMCR are set to known values */ + write_sysreg_s(0, SYS_SMCR_EL1); + /* Allow EL0 to access TPIDR2 */ write_sysreg(read_sysreg(SCTLR_EL1) | SCTLR_ELx_ENTP2, SCTLR_EL1); isb(); diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c index 35225632d70a..2f5755192c2b 100644 --- a/arch/arm64/kernel/hw_breakpoint.c +++ b/arch/arm64/kernel/hw_breakpoint.c @@ -21,6 +21,7 @@ #include <asm/current.h> #include <asm/debug-monitors.h> +#include <asm/esr.h> #include <asm/hw_breakpoint.h> #include <asm/traps.h> #include <asm/cputype.h> @@ -779,7 +780,7 @@ static int watchpoint_handler(unsigned long addr, unsigned long esr, * Check that the access type matches. * 0 => load, otherwise => store */ - access = (esr & AARCH64_ESR_ACCESS_MASK) ? HW_BREAKPOINT_W : + access = (esr & ESR_ELx_WNR) ? HW_BREAKPOINT_W : HW_BREAKPOINT_R; if (!(access & hw_breakpoint_type(wp))) continue; diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 5e4dc72ab1bd..e931ce078a00 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -36,6 +36,8 @@ PROVIDE(__pi___memcpy = __pi_memcpy); PROVIDE(__pi___memmove = __pi_memmove); PROVIDE(__pi___memset = __pi_memset); +PROVIDE(__pi_vabits_actual = vabits_actual); + #ifdef CONFIG_KVM /* diff --git a/arch/arm64/kernel/pi/kaslr_early.c b/arch/arm64/kernel/pi/kaslr_early.c index 17bff6e399e4..b9e0bb4bc6a9 100644 --- a/arch/arm64/kernel/pi/kaslr_early.c +++ b/arch/arm64/kernel/pi/kaslr_early.c @@ -14,6 +14,7 @@ #include <asm/archrandom.h> #include <asm/memory.h> +#include <asm/pgtable.h> /* taken from lib/string.c */ static char *__strstr(const char *s1, const char *s2) @@ -87,7 +88,7 @@ static u64 get_kaslr_seed(void *fdt) asmlinkage u64 kaslr_early_init(void *fdt) { - u64 seed; + u64 seed, range; if (is_kaslr_disabled_cmdline(fdt)) return 0; @@ -102,9 +103,9 @@ asmlinkage u64 kaslr_early_init(void *fdt) /* * OK, so we are proceeding with KASLR enabled. Calculate a suitable * kernel image offset from the seed. Let's place the kernel in the - * middle half of the VMALLOC area (VA_BITS_MIN - 2), and stay clear of - * the lower and upper quarters to avoid colliding with other - * allocations. + * 'middle' half of the VMALLOC area, and stay clear of the lower and + * upper quarters to avoid colliding with other allocations. */ - return BIT(VA_BITS_MIN - 3) + (seed & GENMASK(VA_BITS_MIN - 3, 0)); + range = (VMALLOC_END - KIMAGE_VADDR) / 2; + return range / 2 + (((__uint128_t)range * seed) >> 64); } diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 70b91a8c6bb3..327855a11df2 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -371,6 +371,21 @@ static struct break_hook kprobes_break_ss_hook = { .fn = kprobe_breakpoint_ss_handler, }; +static int __kprobes +kretprobe_breakpoint_handler(struct pt_regs *regs, unsigned long esr) +{ + if (regs->pc != (unsigned long)__kretprobe_trampoline) + return DBG_HOOK_ERROR; + + regs->pc = kretprobe_trampoline_handler(regs, (void *)regs->regs[29]); + return DBG_HOOK_HANDLED; +} + +static struct break_hook kretprobes_break_hook = { + .imm = KRETPROBES_BRK_IMM, + .fn = kretprobe_breakpoint_handler, +}; + /* * Provide a blacklist of symbols identifying ranges which cannot be kprobed. * This blacklist is exposed to userspace via debugfs (kprobes/blacklist). @@ -396,11 +411,6 @@ int __init arch_populate_kprobe_blacklist(void) return ret; } -void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs) -{ - return (void *)kretprobe_trampoline_handler(regs, (void *)regs->regs[29]); -} - void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { @@ -420,6 +430,7 @@ int __init arch_init_kprobes(void) { register_kernel_break_hook(&kprobes_break_hook); register_kernel_break_hook(&kprobes_break_ss_hook); + register_kernel_break_hook(&kretprobes_break_hook); return 0; } diff --git a/arch/arm64/kernel/probes/kprobes_trampoline.S b/arch/arm64/kernel/probes/kprobes_trampoline.S index 9a6499bed58b..a362f3dbb3d1 100644 --- a/arch/arm64/kernel/probes/kprobes_trampoline.S +++ b/arch/arm64/kernel/probes/kprobes_trampoline.S @@ -4,83 +4,17 @@ */ #include <linux/linkage.h> -#include <asm/asm-offsets.h> +#include <asm/asm-bug.h> #include <asm/assembler.h> .text - .macro save_all_base_regs - stp x0, x1, [sp, #S_X0] - stp x2, x3, [sp, #S_X2] - stp x4, x5, [sp, #S_X4] - stp x6, x7, [sp, #S_X6] - stp x8, x9, [sp, #S_X8] - stp x10, x11, [sp, #S_X10] - stp x12, x13, [sp, #S_X12] - stp x14, x15, [sp, #S_X14] - stp x16, x17, [sp, #S_X16] - stp x18, x19, [sp, #S_X18] - stp x20, x21, [sp, #S_X20] - stp x22, x23, [sp, #S_X22] - stp x24, x25, [sp, #S_X24] - stp x26, x27, [sp, #S_X26] - stp x28, x29, [sp, #S_X28] - add x0, sp, #PT_REGS_SIZE - stp lr, x0, [sp, #S_LR] - /* - * Construct a useful saved PSTATE - */ - mrs x0, nzcv - mrs x1, daif - orr x0, x0, x1 - mrs x1, CurrentEL - orr x0, x0, x1 - mrs x1, SPSel - orr x0, x0, x1 - stp xzr, x0, [sp, #S_PC] - .endm - - .macro restore_all_base_regs - ldr x0, [sp, #S_PSTATE] - and x0, x0, #(PSR_N_BIT | PSR_Z_BIT | PSR_C_BIT | PSR_V_BIT) - msr nzcv, x0 - ldp x0, x1, [sp, #S_X0] - ldp x2, x3, [sp, #S_X2] - ldp x4, x5, [sp, #S_X4] - ldp x6, x7, [sp, #S_X6] - ldp x8, x9, [sp, #S_X8] - ldp x10, x11, [sp, #S_X10] - ldp x12, x13, [sp, #S_X12] - ldp x14, x15, [sp, #S_X14] - ldp x16, x17, [sp, #S_X16] - ldp x18, x19, [sp, #S_X18] - ldp x20, x21, [sp, #S_X20] - ldp x22, x23, [sp, #S_X22] - ldp x24, x25, [sp, #S_X24] - ldp x26, x27, [sp, #S_X26] - ldp x28, x29, [sp, #S_X28] - .endm - SYM_CODE_START(__kretprobe_trampoline) - sub sp, sp, #PT_REGS_SIZE - - save_all_base_regs - - /* Setup a frame pointer. */ - add x29, sp, #S_FP - - mov x0, sp - bl trampoline_probe_handler /* - * Replace trampoline address in lr with actual orig_ret_addr return - * address. + * Trigger a breakpoint exception. The PC will be adjusted by + * kretprobe_breakpoint_handler(), and no subsequent instructions will + * be executed from the trampoline. */ - mov lr, x0 - - /* The frame pointer (x29) is restored with other registers. */ - restore_all_base_regs - - add sp, sp, #PT_REGS_SIZE - ret - + brk #KRETPROBES_BRK_IMM + ASM_BUG() SYM_CODE_END(__kretprobe_trampoline) diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 7387b68c745b..4ae31b7af6c3 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -290,9 +290,6 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) 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 diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index aacb45bd36e6..b096c8be3bcf 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -174,7 +174,6 @@ static void ptrace_hbptriggered(struct perf_event *bp, struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); const char *desc = "Hardware breakpoint trap (ptrace)"; -#ifdef CONFIG_COMPAT if (is_compat_task()) { int si_errno = 0; int i; @@ -196,7 +195,7 @@ static void ptrace_hbptriggered(struct perf_event *bp, desc); return; } -#endif + arm64_force_sig_fault(SIGTRAP, TRAP_HWBKPT, bkpt->trigger, desc); } @@ -1638,7 +1637,6 @@ static const struct user_regset_view user_aarch64_view = { .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets) }; -#ifdef CONFIG_COMPAT enum compat_regset { REGSET_COMPAT_GPR, REGSET_COMPAT_VFP, @@ -1895,6 +1893,7 @@ static const struct user_regset_view user_aarch32_ptrace_view = { .regsets = aarch32_ptrace_regsets, .n = ARRAY_SIZE(aarch32_ptrace_regsets) }; +#ifdef CONFIG_COMPAT static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off, compat_ulong_t __user *ret) { @@ -2156,7 +2155,6 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request, const struct user_regset_view *task_user_regset_view(struct task_struct *task) { -#ifdef CONFIG_COMPAT /* * Core dumping of 32-bit tasks or compat ptrace requests must use the * user_aarch32_view compatible with arm32. Native ptrace requests on @@ -2167,7 +2165,7 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task) return &user_aarch32_view; else if (is_compat_thread(task_thread_info(task))) return &user_aarch32_ptrace_view; -#endif + return &user_aarch64_view; } diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 42c690bb2d60..ab43bfa85368 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -320,9 +320,8 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p) dynamic_scs_init(); /* - * Unmask asynchronous aborts and fiq after bringing up possible - * earlycon. (Report possible System Errors once we can report this - * occurred). + * Unmask SError as soon as possible after initializing earlycon so + * that we can report any SErrors immediately. */ local_daif_restore(DAIF_PROCCTX_NOIRQ); diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 460823baa603..ac69b604cac9 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -16,8 +16,8 @@ #include <linux/uaccess.h> #include <linux/sizes.h> #include <linux/string.h> -#include <linux/resume_user_mode.h> #include <linux/ratelimit.h> +#include <linux/rseq.h> #include <linux/syscalls.h> #include <asm/daifflags.h> @@ -1266,7 +1266,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) * the kernel can handle, and then we build all the user-level signal handling * stack-frames in one go after that. */ -static void do_signal(struct pt_regs *regs) +void do_signal(struct pt_regs *regs) { unsigned long continue_addr = 0, restart_addr = 0; int retval = 0; @@ -1337,41 +1337,6 @@ static void do_signal(struct pt_regs *regs) restore_saved_sigmask(); } -void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags) -{ - do { - if (thread_flags & _TIF_NEED_RESCHED) { - /* Unmask Debug and SError for the next task */ - local_daif_restore(DAIF_PROCCTX_NOIRQ); - - schedule(); - } else { - local_daif_restore(DAIF_PROCCTX); - - if (thread_flags & _TIF_UPROBE) - uprobe_notify_resume(regs); - - if (thread_flags & _TIF_MTE_ASYNC_FAULT) { - clear_thread_flag(TIF_MTE_ASYNC_FAULT); - send_sig_fault(SIGSEGV, SEGV_MTEAERR, - (void __user *)NULL, current); - } - - if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) - do_signal(regs); - - if (thread_flags & _TIF_NOTIFY_RESUME) - resume_user_mode_work(regs); - - if (thread_flags & _TIF_FOREIGN_FPSTATE) - fpsimd_restore_current_state(); - } - - local_daif_mask(); - thread_flags = read_thread_flags(); - } while (thread_flags & _TIF_WORK_MASK); -} - unsigned long __ro_after_init signal_minsigstksz; /* diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index 9a70d9746b66..ad198262b981 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -20,14 +20,11 @@ long sys_ni_syscall(void); static long do_ni_syscall(struct pt_regs *regs, int scno) { -#ifdef CONFIG_COMPAT - long ret; if (is_compat_task()) { - ret = compat_arm_syscall(regs, scno); + long ret = compat_arm_syscall(regs, scno); if (ret != -ENOSYS) return ret; } -#endif return sys_ni_syscall(); } |