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5a06fcb15b
test_kernel_ptr() uses access_ok() to figure out if a given address points to user space instead of kernel space. However on architectures that set CONFIG_ALTERNATE_USER_ADDRESS_SPACE, a pointer can be valid for both, and the check always fails because access_ok() returns true. Make the check for user space pointers conditional on the type of address space layout. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
621 lines
16 KiB
C
621 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Test module to generate lockups
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/clock.h>
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#include <linux/cpu.h>
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#include <linux/nmi.h>
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#include <linux/mm.h>
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#include <linux/uaccess.h>
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#include <linux/file.h>
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static unsigned int time_secs;
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module_param(time_secs, uint, 0600);
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MODULE_PARM_DESC(time_secs, "lockup time in seconds, default 0");
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static unsigned int time_nsecs;
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module_param(time_nsecs, uint, 0600);
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MODULE_PARM_DESC(time_nsecs, "nanoseconds part of lockup time, default 0");
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static unsigned int cooldown_secs;
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module_param(cooldown_secs, uint, 0600);
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MODULE_PARM_DESC(cooldown_secs, "cooldown time between iterations in seconds, default 0");
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static unsigned int cooldown_nsecs;
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module_param(cooldown_nsecs, uint, 0600);
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MODULE_PARM_DESC(cooldown_nsecs, "nanoseconds part of cooldown, default 0");
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static unsigned int iterations = 1;
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module_param(iterations, uint, 0600);
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MODULE_PARM_DESC(iterations, "lockup iterations, default 1");
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static bool all_cpus;
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module_param(all_cpus, bool, 0400);
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MODULE_PARM_DESC(all_cpus, "trigger lockup at all cpus at once");
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static int wait_state;
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static char *state = "R";
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module_param(state, charp, 0400);
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MODULE_PARM_DESC(state, "wait in 'R' running (default), 'D' uninterruptible, 'K' killable, 'S' interruptible state");
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static bool use_hrtimer;
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module_param(use_hrtimer, bool, 0400);
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MODULE_PARM_DESC(use_hrtimer, "use high-resolution timer for sleeping");
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static bool iowait;
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module_param(iowait, bool, 0400);
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MODULE_PARM_DESC(iowait, "account sleep time as iowait");
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static bool lock_read;
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module_param(lock_read, bool, 0400);
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MODULE_PARM_DESC(lock_read, "lock read-write locks for read");
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static bool lock_single;
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module_param(lock_single, bool, 0400);
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MODULE_PARM_DESC(lock_single, "acquire locks only at one cpu");
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static bool reacquire_locks;
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module_param(reacquire_locks, bool, 0400);
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MODULE_PARM_DESC(reacquire_locks, "release and reacquire locks/irq/preempt between iterations");
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static bool touch_softlockup;
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module_param(touch_softlockup, bool, 0600);
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MODULE_PARM_DESC(touch_softlockup, "touch soft-lockup watchdog between iterations");
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static bool touch_hardlockup;
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module_param(touch_hardlockup, bool, 0600);
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MODULE_PARM_DESC(touch_hardlockup, "touch hard-lockup watchdog between iterations");
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static bool call_cond_resched;
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module_param(call_cond_resched, bool, 0600);
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MODULE_PARM_DESC(call_cond_resched, "call cond_resched() between iterations");
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static bool measure_lock_wait;
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module_param(measure_lock_wait, bool, 0400);
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MODULE_PARM_DESC(measure_lock_wait, "measure lock wait time");
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static unsigned long lock_wait_threshold = ULONG_MAX;
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module_param(lock_wait_threshold, ulong, 0400);
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MODULE_PARM_DESC(lock_wait_threshold, "print lock wait time longer than this in nanoseconds, default off");
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static bool test_disable_irq;
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module_param_named(disable_irq, test_disable_irq, bool, 0400);
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MODULE_PARM_DESC(disable_irq, "disable interrupts: generate hard-lockups");
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static bool disable_softirq;
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module_param(disable_softirq, bool, 0400);
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MODULE_PARM_DESC(disable_softirq, "disable bottom-half irq handlers");
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static bool disable_preempt;
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module_param(disable_preempt, bool, 0400);
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MODULE_PARM_DESC(disable_preempt, "disable preemption: generate soft-lockups");
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static bool lock_rcu;
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module_param(lock_rcu, bool, 0400);
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MODULE_PARM_DESC(lock_rcu, "grab rcu_read_lock: generate rcu stalls");
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static bool lock_mmap_sem;
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module_param(lock_mmap_sem, bool, 0400);
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MODULE_PARM_DESC(lock_mmap_sem, "lock mm->mmap_lock: block procfs interfaces");
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static unsigned long lock_rwsem_ptr;
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module_param_unsafe(lock_rwsem_ptr, ulong, 0400);
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MODULE_PARM_DESC(lock_rwsem_ptr, "lock rw_semaphore at address");
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static unsigned long lock_mutex_ptr;
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module_param_unsafe(lock_mutex_ptr, ulong, 0400);
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MODULE_PARM_DESC(lock_mutex_ptr, "lock mutex at address");
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static unsigned long lock_spinlock_ptr;
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module_param_unsafe(lock_spinlock_ptr, ulong, 0400);
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MODULE_PARM_DESC(lock_spinlock_ptr, "lock spinlock at address");
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static unsigned long lock_rwlock_ptr;
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module_param_unsafe(lock_rwlock_ptr, ulong, 0400);
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MODULE_PARM_DESC(lock_rwlock_ptr, "lock rwlock at address");
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static unsigned int alloc_pages_nr;
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module_param_unsafe(alloc_pages_nr, uint, 0600);
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MODULE_PARM_DESC(alloc_pages_nr, "allocate and free pages under locks");
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static unsigned int alloc_pages_order;
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module_param(alloc_pages_order, uint, 0400);
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MODULE_PARM_DESC(alloc_pages_order, "page order to allocate");
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static gfp_t alloc_pages_gfp = GFP_KERNEL;
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module_param_unsafe(alloc_pages_gfp, uint, 0400);
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MODULE_PARM_DESC(alloc_pages_gfp, "allocate pages with this gfp_mask, default GFP_KERNEL");
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static bool alloc_pages_atomic;
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module_param(alloc_pages_atomic, bool, 0400);
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MODULE_PARM_DESC(alloc_pages_atomic, "allocate pages with GFP_ATOMIC");
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static bool reallocate_pages;
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module_param(reallocate_pages, bool, 0400);
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MODULE_PARM_DESC(reallocate_pages, "free and allocate pages between iterations");
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struct file *test_file;
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static struct inode *test_inode;
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static char test_file_path[256];
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module_param_string(file_path, test_file_path, sizeof(test_file_path), 0400);
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MODULE_PARM_DESC(file_path, "file path to test");
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static bool test_lock_inode;
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module_param_named(lock_inode, test_lock_inode, bool, 0400);
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MODULE_PARM_DESC(lock_inode, "lock file -> inode -> i_rwsem");
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static bool test_lock_mapping;
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module_param_named(lock_mapping, test_lock_mapping, bool, 0400);
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MODULE_PARM_DESC(lock_mapping, "lock file -> mapping -> i_mmap_rwsem");
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static bool test_lock_sb_umount;
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module_param_named(lock_sb_umount, test_lock_sb_umount, bool, 0400);
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MODULE_PARM_DESC(lock_sb_umount, "lock file -> sb -> s_umount");
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static atomic_t alloc_pages_failed = ATOMIC_INIT(0);
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static atomic64_t max_lock_wait = ATOMIC64_INIT(0);
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static struct task_struct *main_task;
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static int master_cpu;
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static void test_lock(bool master, bool verbose)
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{
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u64 wait_start;
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if (measure_lock_wait)
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wait_start = local_clock();
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if (lock_mutex_ptr && master) {
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if (verbose)
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pr_notice("lock mutex %ps\n", (void *)lock_mutex_ptr);
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mutex_lock((struct mutex *)lock_mutex_ptr);
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}
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if (lock_rwsem_ptr && master) {
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if (verbose)
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pr_notice("lock rw_semaphore %ps\n",
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(void *)lock_rwsem_ptr);
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if (lock_read)
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down_read((struct rw_semaphore *)lock_rwsem_ptr);
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else
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down_write((struct rw_semaphore *)lock_rwsem_ptr);
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}
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if (lock_mmap_sem && master) {
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if (verbose)
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pr_notice("lock mmap_lock pid=%d\n", main_task->pid);
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if (lock_read)
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mmap_read_lock(main_task->mm);
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else
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mmap_write_lock(main_task->mm);
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}
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if (test_disable_irq)
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local_irq_disable();
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if (disable_softirq)
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local_bh_disable();
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if (disable_preempt)
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preempt_disable();
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if (lock_rcu)
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rcu_read_lock();
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if (lock_spinlock_ptr && master) {
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if (verbose)
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pr_notice("lock spinlock %ps\n",
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(void *)lock_spinlock_ptr);
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spin_lock((spinlock_t *)lock_spinlock_ptr);
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}
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if (lock_rwlock_ptr && master) {
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if (verbose)
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pr_notice("lock rwlock %ps\n",
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(void *)lock_rwlock_ptr);
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if (lock_read)
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read_lock((rwlock_t *)lock_rwlock_ptr);
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else
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write_lock((rwlock_t *)lock_rwlock_ptr);
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}
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if (measure_lock_wait) {
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s64 cur_wait = local_clock() - wait_start;
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s64 max_wait = atomic64_read(&max_lock_wait);
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do {
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if (cur_wait < max_wait)
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break;
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max_wait = atomic64_cmpxchg(&max_lock_wait,
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max_wait, cur_wait);
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} while (max_wait != cur_wait);
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if (cur_wait > lock_wait_threshold)
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pr_notice_ratelimited("lock wait %lld ns\n", cur_wait);
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}
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}
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static void test_unlock(bool master, bool verbose)
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{
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if (lock_rwlock_ptr && master) {
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if (lock_read)
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read_unlock((rwlock_t *)lock_rwlock_ptr);
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else
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write_unlock((rwlock_t *)lock_rwlock_ptr);
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if (verbose)
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pr_notice("unlock rwlock %ps\n",
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(void *)lock_rwlock_ptr);
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}
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if (lock_spinlock_ptr && master) {
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spin_unlock((spinlock_t *)lock_spinlock_ptr);
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if (verbose)
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pr_notice("unlock spinlock %ps\n",
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(void *)lock_spinlock_ptr);
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}
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if (lock_rcu)
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rcu_read_unlock();
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if (disable_preempt)
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preempt_enable();
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if (disable_softirq)
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local_bh_enable();
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if (test_disable_irq)
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local_irq_enable();
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if (lock_mmap_sem && master) {
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if (lock_read)
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mmap_read_unlock(main_task->mm);
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else
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mmap_write_unlock(main_task->mm);
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if (verbose)
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pr_notice("unlock mmap_lock pid=%d\n", main_task->pid);
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}
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if (lock_rwsem_ptr && master) {
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if (lock_read)
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up_read((struct rw_semaphore *)lock_rwsem_ptr);
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else
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up_write((struct rw_semaphore *)lock_rwsem_ptr);
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if (verbose)
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pr_notice("unlock rw_semaphore %ps\n",
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(void *)lock_rwsem_ptr);
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}
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if (lock_mutex_ptr && master) {
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mutex_unlock((struct mutex *)lock_mutex_ptr);
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if (verbose)
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pr_notice("unlock mutex %ps\n",
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(void *)lock_mutex_ptr);
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}
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}
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static void test_alloc_pages(struct list_head *pages)
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{
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struct page *page;
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unsigned int i;
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for (i = 0; i < alloc_pages_nr; i++) {
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page = alloc_pages(alloc_pages_gfp, alloc_pages_order);
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if (!page) {
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atomic_inc(&alloc_pages_failed);
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break;
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}
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list_add(&page->lru, pages);
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}
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}
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static void test_free_pages(struct list_head *pages)
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{
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struct page *page, *next;
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list_for_each_entry_safe(page, next, pages, lru)
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__free_pages(page, alloc_pages_order);
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INIT_LIST_HEAD(pages);
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}
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static void test_wait(unsigned int secs, unsigned int nsecs)
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{
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if (wait_state == TASK_RUNNING) {
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if (secs)
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mdelay(secs * MSEC_PER_SEC);
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if (nsecs)
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ndelay(nsecs);
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return;
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}
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__set_current_state(wait_state);
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if (use_hrtimer) {
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ktime_t time;
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time = ns_to_ktime((u64)secs * NSEC_PER_SEC + nsecs);
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schedule_hrtimeout(&time, HRTIMER_MODE_REL);
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} else {
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schedule_timeout(secs * HZ + nsecs_to_jiffies(nsecs));
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}
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}
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static void test_lockup(bool master)
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{
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u64 lockup_start = local_clock();
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unsigned int iter = 0;
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LIST_HEAD(pages);
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pr_notice("Start on CPU%d\n", raw_smp_processor_id());
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test_lock(master, true);
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test_alloc_pages(&pages);
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while (iter++ < iterations && !signal_pending(main_task)) {
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if (iowait)
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current->in_iowait = 1;
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test_wait(time_secs, time_nsecs);
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if (iowait)
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current->in_iowait = 0;
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if (reallocate_pages)
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test_free_pages(&pages);
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if (reacquire_locks)
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test_unlock(master, false);
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if (touch_softlockup)
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touch_softlockup_watchdog();
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if (touch_hardlockup)
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touch_nmi_watchdog();
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if (call_cond_resched)
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cond_resched();
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test_wait(cooldown_secs, cooldown_nsecs);
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if (reacquire_locks)
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test_lock(master, false);
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if (reallocate_pages)
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test_alloc_pages(&pages);
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}
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pr_notice("Finish on CPU%d in %lld ns\n", raw_smp_processor_id(),
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local_clock() - lockup_start);
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test_free_pages(&pages);
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test_unlock(master, true);
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}
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static DEFINE_PER_CPU(struct work_struct, test_works);
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static void test_work_fn(struct work_struct *work)
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{
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test_lockup(!lock_single ||
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work == per_cpu_ptr(&test_works, master_cpu));
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}
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static bool test_kernel_ptr(unsigned long addr, int size)
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{
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void *ptr = (void *)addr;
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char buf;
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if (!addr)
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return false;
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/* should be at least readable kernel address */
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if (!IS_ENABLED(CONFIG_ALTERNATE_USER_ADDRESS_SPACE) &&
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(access_ok((void __user *)ptr, 1) ||
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access_ok((void __user *)ptr + size - 1, 1))) {
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pr_err("user space ptr invalid in kernel: %#lx\n", addr);
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return true;
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}
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if (get_kernel_nofault(buf, ptr) ||
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get_kernel_nofault(buf, ptr + size - 1)) {
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pr_err("invalid kernel ptr: %#lx\n", addr);
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return true;
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}
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return false;
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}
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static bool __maybe_unused test_magic(unsigned long addr, int offset,
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unsigned int expected)
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{
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void *ptr = (void *)addr + offset;
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unsigned int magic = 0;
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if (!addr)
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return false;
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if (get_kernel_nofault(magic, ptr) || magic != expected) {
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pr_err("invalid magic at %#lx + %#x = %#x, expected %#x\n",
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addr, offset, magic, expected);
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return true;
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}
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return false;
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}
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static int __init test_lockup_init(void)
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{
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u64 test_start = local_clock();
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main_task = current;
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switch (state[0]) {
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case 'S':
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wait_state = TASK_INTERRUPTIBLE;
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break;
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case 'D':
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wait_state = TASK_UNINTERRUPTIBLE;
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break;
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case 'K':
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wait_state = TASK_KILLABLE;
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break;
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case 'R':
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wait_state = TASK_RUNNING;
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break;
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default:
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pr_err("unknown state=%s\n", state);
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return -EINVAL;
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}
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if (alloc_pages_atomic)
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alloc_pages_gfp = GFP_ATOMIC;
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if (test_kernel_ptr(lock_spinlock_ptr, sizeof(spinlock_t)) ||
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test_kernel_ptr(lock_rwlock_ptr, sizeof(rwlock_t)) ||
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test_kernel_ptr(lock_mutex_ptr, sizeof(struct mutex)) ||
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test_kernel_ptr(lock_rwsem_ptr, sizeof(struct rw_semaphore)))
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return -EINVAL;
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#ifdef CONFIG_DEBUG_SPINLOCK
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#ifdef CONFIG_PREEMPT_RT
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if (test_magic(lock_spinlock_ptr,
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offsetof(spinlock_t, lock.wait_lock.magic),
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SPINLOCK_MAGIC) ||
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test_magic(lock_rwlock_ptr,
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offsetof(rwlock_t, rwbase.rtmutex.wait_lock.magic),
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SPINLOCK_MAGIC) ||
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test_magic(lock_mutex_ptr,
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offsetof(struct mutex, rtmutex.wait_lock.magic),
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SPINLOCK_MAGIC) ||
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|
test_magic(lock_rwsem_ptr,
|
|
offsetof(struct rw_semaphore, rwbase.rtmutex.wait_lock.magic),
|
|
SPINLOCK_MAGIC))
|
|
return -EINVAL;
|
|
#else
|
|
if (test_magic(lock_spinlock_ptr,
|
|
offsetof(spinlock_t, rlock.magic),
|
|
SPINLOCK_MAGIC) ||
|
|
test_magic(lock_rwlock_ptr,
|
|
offsetof(rwlock_t, magic),
|
|
RWLOCK_MAGIC) ||
|
|
test_magic(lock_mutex_ptr,
|
|
offsetof(struct mutex, wait_lock.magic),
|
|
SPINLOCK_MAGIC) ||
|
|
test_magic(lock_rwsem_ptr,
|
|
offsetof(struct rw_semaphore, wait_lock.magic),
|
|
SPINLOCK_MAGIC))
|
|
return -EINVAL;
|
|
#endif
|
|
#endif
|
|
|
|
if ((wait_state != TASK_RUNNING ||
|
|
(call_cond_resched && !reacquire_locks) ||
|
|
(alloc_pages_nr && gfpflags_allow_blocking(alloc_pages_gfp))) &&
|
|
(test_disable_irq || disable_softirq || disable_preempt ||
|
|
lock_rcu || lock_spinlock_ptr || lock_rwlock_ptr)) {
|
|
pr_err("refuse to sleep in atomic context\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (lock_mmap_sem && !main_task->mm) {
|
|
pr_err("no mm to lock mmap_lock\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (test_file_path[0]) {
|
|
test_file = filp_open(test_file_path, O_RDONLY, 0);
|
|
if (IS_ERR(test_file)) {
|
|
pr_err("failed to open %s: %ld\n", test_file_path, PTR_ERR(test_file));
|
|
return PTR_ERR(test_file);
|
|
}
|
|
test_inode = file_inode(test_file);
|
|
} else if (test_lock_inode ||
|
|
test_lock_mapping ||
|
|
test_lock_sb_umount) {
|
|
pr_err("no file to lock\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (test_lock_inode && test_inode)
|
|
lock_rwsem_ptr = (unsigned long)&test_inode->i_rwsem;
|
|
|
|
if (test_lock_mapping && test_file && test_file->f_mapping)
|
|
lock_rwsem_ptr = (unsigned long)&test_file->f_mapping->i_mmap_rwsem;
|
|
|
|
if (test_lock_sb_umount && test_inode)
|
|
lock_rwsem_ptr = (unsigned long)&test_inode->i_sb->s_umount;
|
|
|
|
pr_notice("START pid=%d time=%u +%u ns cooldown=%u +%u ns iterations=%u state=%s %s%s%s%s%s%s%s%s%s%s%s\n",
|
|
main_task->pid, time_secs, time_nsecs,
|
|
cooldown_secs, cooldown_nsecs, iterations, state,
|
|
all_cpus ? "all_cpus " : "",
|
|
iowait ? "iowait " : "",
|
|
test_disable_irq ? "disable_irq " : "",
|
|
disable_softirq ? "disable_softirq " : "",
|
|
disable_preempt ? "disable_preempt " : "",
|
|
lock_rcu ? "lock_rcu " : "",
|
|
lock_read ? "lock_read " : "",
|
|
touch_softlockup ? "touch_softlockup " : "",
|
|
touch_hardlockup ? "touch_hardlockup " : "",
|
|
call_cond_resched ? "call_cond_resched " : "",
|
|
reacquire_locks ? "reacquire_locks " : "");
|
|
|
|
if (alloc_pages_nr)
|
|
pr_notice("ALLOCATE PAGES nr=%u order=%u gfp=%pGg %s\n",
|
|
alloc_pages_nr, alloc_pages_order, &alloc_pages_gfp,
|
|
reallocate_pages ? "reallocate_pages " : "");
|
|
|
|
if (all_cpus) {
|
|
unsigned int cpu;
|
|
|
|
cpus_read_lock();
|
|
|
|
preempt_disable();
|
|
master_cpu = smp_processor_id();
|
|
for_each_online_cpu(cpu) {
|
|
INIT_WORK(per_cpu_ptr(&test_works, cpu), test_work_fn);
|
|
queue_work_on(cpu, system_highpri_wq,
|
|
per_cpu_ptr(&test_works, cpu));
|
|
}
|
|
preempt_enable();
|
|
|
|
for_each_online_cpu(cpu)
|
|
flush_work(per_cpu_ptr(&test_works, cpu));
|
|
|
|
cpus_read_unlock();
|
|
} else {
|
|
test_lockup(true);
|
|
}
|
|
|
|
if (measure_lock_wait)
|
|
pr_notice("Maximum lock wait: %lld ns\n",
|
|
atomic64_read(&max_lock_wait));
|
|
|
|
if (alloc_pages_nr)
|
|
pr_notice("Page allocation failed %u times\n",
|
|
atomic_read(&alloc_pages_failed));
|
|
|
|
pr_notice("FINISH in %llu ns\n", local_clock() - test_start);
|
|
|
|
if (test_file)
|
|
fput(test_file);
|
|
|
|
if (signal_pending(main_task))
|
|
return -EINTR;
|
|
|
|
return -EAGAIN;
|
|
}
|
|
module_init(test_lockup_init);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Konstantin Khlebnikov <khlebnikov@yandex-team.ru>");
|
|
MODULE_DESCRIPTION("Test module to generate lockups");
|