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Sun, 8 Mar 2020 03:50:58 +0000 From: Alex Belits To: "frederic@kernel.org" , "rostedt@goodmis.org" Subject: [PATCH v2 06/12] task_isolation: arch/arm64: enable task isolation functionality Thread-Topic: [PATCH v2 06/12] task_isolation: arch/arm64: enable task isolation functionality Thread-Index: AQHV9PzGqYwRhIb41UmglY+oy7CR8w== Date: Sun, 8 Mar 2020 03:50:58 +0000 Message-ID: References: <4473787e1b6bc3cc226067e8d122092a678b63de.camel@marvell.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [199.233.58.128] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 707ff5f4-e4bc-4c19-b080-08d7c313e959 x-ms-traffictypediagnostic: BYAPR18MB2920: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 03361FCC43 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(376002)(366004)(346002)(39850400004)(396003)(136003)(189003)(199004)(4326008)(2616005)(110136005)(186003)(36756003)(54906003)(81156014)(81166006)(86362001)(7416002)(8676002)(26005)(2906002)(6486002)(71200400001)(8936002)(66946007)(5660300002)(6512007)(316002)(478600001)(91956017)(6506007)(66446008)(64756008)(66556008)(66476007)(76116006); 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Chris Metcalf In do_notify_resume(), call task_isolation_start() for TIF_TASK_ISOLATION tasks. Add _TIF_TASK_ISOLATION to _TIF_WORK_MASK, and define a local NOTIFY_RESUME_LOOP_FLAGS to check in the loop, since we don't clear _TIF_TASK_ISOLATION in the loop. We instrument the smp_send_reschedule() routine so that it checks for isolated tasks and generates a suitable warning if needed. Finally, report on page faults in task-isolation processes in do_page_faults(). Signed-off-by: Chris Metcalf [abelits@marvell.com: simplified to match kernel 5.6] Signed-off-by: Alex Belits --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/thread_info.h | 5 ++++- arch/arm64/kernel/ptrace.c | 10 ++++++++++ arch/arm64/kernel/signal.c | 13 ++++++++++++- arch/arm64/kernel/smp.c | 7 +++++++ arch/arm64/mm/fault.c | 5 +++++ 6 files changed, 39 insertions(+), 2 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 0b30e884e088..93b6aabc8be9 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -129,6 +129,7 @@ config ARM64 select HAVE_ARCH_PREL32_RELOCATIONS select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_STACKLEAK + select HAVE_ARCH_TASK_ISOLATION select HAVE_ARCH_THREAD_STRUCT_WHITELIST select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index f0cec4160136..7563098eb5b2 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -63,6 +63,7 @@ void arch_release_task_struct(struct task_struct *tsk); #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */ #define TIF_FSCHECK 5 /* Check FS is USER_DS on return */ +#define TIF_TASK_ISOLATION 6 #define TIF_NOHZ 7 #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing */ @@ -83,6 +84,7 @@ void arch_release_task_struct(struct task_struct *tsk); #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) +#define _TIF_TASK_ISOLATION (1 << TIF_TASK_ISOLATION) #define _TIF_NOHZ (1 << TIF_NOHZ) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) @@ -96,7 +98,8 @@ void arch_release_task_struct(struct task_struct *tsk); #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ - _TIF_UPROBE | _TIF_FSCHECK) + _TIF_UPROBE | _TIF_FSCHECK | \ + _TIF_TASK_ISOLATION) #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index cd6e5fa48b9c..b35b9b0c594c 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include @@ -1836,6 +1837,15 @@ int syscall_trace_enter(struct pt_regs *regs) return -1; } + /* + * In task isolation mode, we may prevent the syscall from + * running, and if so we also deliver a signal to the process. + */ + if (test_thread_flag(TIF_TASK_ISOLATION)) { + if (task_isolation_syscall(regs->syscallno) == -1) + return -1; + } + /* Do the secure computing after ptrace; failures should be fast. */ if (secure_computing() == -1) return -1; diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 339882db5a91..d488c91a4877 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -898,6 +899,11 @@ static void do_signal(struct pt_regs *regs) restore_saved_sigmask(); } +#define NOTIFY_RESUME_LOOP_FLAGS \ + (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ + _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ + _TIF_UPROBE | _TIF_FSCHECK) + asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags) { @@ -908,6 +914,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, */ trace_hardirqs_off(); + task_isolation_check_run_cleanup(); + do { /* Check valid user FS if needed */ addr_limit_user_check(); @@ -938,7 +946,10 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, local_daif_mask(); thread_flags = READ_ONCE(current_thread_info()->flags); - } while (thread_flags & _TIF_WORK_MASK); + } while (thread_flags & NOTIFY_RESUME_LOOP_FLAGS); + + if (thread_flags & _TIF_TASK_ISOLATION) + task_isolation_start(); } unsigned long __ro_after_init signal_minsigstksz; diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index d4ed9a19d8fe..00f0f77adea0 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include @@ -818,6 +819,7 @@ void arch_send_call_function_single_ipi(int cpu) #ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL void arch_send_wakeup_ipi_mask(const struct cpumask *mask) { + task_isolation_remote_cpumask(mask, "wakeup IPI"); smp_cross_call(mask, IPI_WAKEUP); } #endif @@ -886,6 +888,9 @@ void handle_IPI(int ipinr, struct pt_regs *regs) __inc_irq_stat(cpu, ipi_irqs[ipinr]); } + task_isolation_interrupt("IPI type %d (%s)", ipinr, + ipinr < NR_IPI ? ipi_types[ipinr] : "unknown"); + switch (ipinr) { case IPI_RESCHEDULE: scheduler_ipi(); @@ -948,12 +953,14 @@ void handle_IPI(int ipinr, struct pt_regs *regs) void smp_send_reschedule(int cpu) { + task_isolation_remote(cpu, "reschedule IPI"); smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); } #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST void tick_broadcast(const struct cpumask *mask) { + task_isolation_remote_cpumask(mask, "timer IPI"); smp_cross_call(mask, IPI_TIMER); } #endif diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 85566d32958f..fc4b42c81c4f 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -543,6 +544,10 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr, */ if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS)))) { + /* No signal was generated, but notify task-isolation tasks. */ + if (user_mode(regs)) + task_isolation_interrupt("page fault at %#lx", addr); + /* * Major/minor page fault accounting is only done * once. If we go through a retry, it is extremely -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel