| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Akinobu Mita | 1697 | 86.89% | 10 | 28.57% |
| Dmitriy Monakhov | 50 | 2.56% | 1 | 2.86% |
| Don Mullis | 34 | 1.74% | 3 | 8.57% |
| Wei Yongjun | 33 | 1.69% | 3 | 8.57% |
| Qi Zheng | 24 | 1.23% | 1 | 2.86% |
| Dmitriy Vyukov | 23 | 1.18% | 2 | 5.71% |
| Greg Kroah-Hartman | 21 | 1.08% | 1 | 2.86% |
| Per Forlin | 21 | 1.08% | 2 | 5.71% |
| Christoph Hellwig | 18 | 0.92% | 2 | 5.71% |
| Will Deacon | 8 | 0.41% | 1 | 2.86% |
| Thomas Gleixner | 7 | 0.36% | 2 | 5.71% |
| Anton Blanchard | 6 | 0.31% | 1 | 2.86% |
| Al Viro | 3 | 0.15% | 1 | 2.86% |
| Jason A. Donenfeld | 3 | 0.15% | 2 | 5.71% |
| Florian Westphal | 2 | 0.10% | 1 | 2.86% |
| Linus Torvalds (pre-git) | 2 | 0.10% | 1 | 2.86% |
| Paul Gortmaker | 1 | 0.05% | 1 | 2.86% |
| Total | 1953 | 35 |
// SPDX-License-Identifier: GPL-2.0-only #include <linux/kernel.h> #include <linux/init.h> #include <linux/random.h> #include <linux/sched.h> #include <linux/stat.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/export.h> #include <linux/interrupt.h> #include <linux/stacktrace.h> #include <linux/fault-inject.h> /* * setup_fault_attr() is a helper function for various __setup handlers, so it * returns 0 on error, because that is what __setup handlers do. */ int setup_fault_attr(struct fault_attr *attr, char *str) { unsigned long probability; unsigned long interval; int times; int space; /* "<interval>,<probability>,<space>,<times>" */ if (sscanf(str, "%lu,%lu,%d,%d", &interval, &probability, &space, ×) < 4) { printk(KERN_WARNING "FAULT_INJECTION: failed to parse arguments\n"); return 0; } attr->probability = probability; attr->interval = interval; atomic_set(&attr->times, times); atomic_set(&attr->space, space); return 1; } EXPORT_SYMBOL_GPL(setup_fault_attr); static void fail_dump(struct fault_attr *attr) { if (attr->verbose > 0 && __ratelimit(&attr->ratelimit_state)) { printk(KERN_NOTICE "FAULT_INJECTION: forcing a failure.\n" "name %pd, interval %lu, probability %lu, " "space %d, times %d\n", attr->dname, attr->interval, attr->probability, atomic_read(&attr->space), atomic_read(&attr->times)); if (attr->verbose > 1) dump_stack(); } } #define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) static bool fail_task(struct fault_attr *attr, struct task_struct *task) { return in_task() && task->make_it_fail; } #define MAX_STACK_TRACE_DEPTH 32 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER static bool fail_stacktrace(struct fault_attr *attr) { int depth = attr->stacktrace_depth; unsigned long entries[MAX_STACK_TRACE_DEPTH]; int n, nr_entries; bool found = (attr->require_start == 0 && attr->require_end == ULONG_MAX); if (depth == 0 || (found && !attr->reject_start && !attr->reject_end)) return found; nr_entries = stack_trace_save(entries, depth, 1); for (n = 0; n < nr_entries; n++) { if (attr->reject_start <= entries[n] && entries[n] < attr->reject_end) return false; if (attr->require_start <= entries[n] && entries[n] < attr->require_end) found = true; } return found; } #else static inline bool fail_stacktrace(struct fault_attr *attr) { return true; } #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */ /* * This code is stolen from failmalloc-1.0 * http://www.nongnu.org/failmalloc/ */ bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags) { bool stack_checked = false; if (in_task()) { unsigned int fail_nth = READ_ONCE(current->fail_nth); if (fail_nth) { if (!fail_stacktrace(attr)) return false; stack_checked = true; fail_nth--; WRITE_ONCE(current->fail_nth, fail_nth); if (!fail_nth) goto fail; return false; } } /* No need to check any other properties if the probability is 0 */ if (attr->probability == 0) return false; if (attr->task_filter && !fail_task(attr, current)) return false; if (atomic_read(&attr->times) == 0) return false; if (!stack_checked && !fail_stacktrace(attr)) return false; if (atomic_read(&attr->space) > size) { atomic_sub(size, &attr->space); return false; } if (attr->interval > 1) { attr->count++; if (attr->count % attr->interval) return false; } if (attr->probability <= get_random_u32_below(100)) return false; fail: if (!(flags & FAULT_NOWARN)) fail_dump(attr); if (atomic_read(&attr->times) != -1) atomic_dec_not_zero(&attr->times); return true; } bool should_fail(struct fault_attr *attr, ssize_t size) { return should_fail_ex(attr, size, 0); } EXPORT_SYMBOL_GPL(should_fail); #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS static int debugfs_ul_set(void *data, u64 val) { *(unsigned long *)data = val; return 0; } static int debugfs_ul_get(void *data, u64 *val) { *val = *(unsigned long *)data; return 0; } DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n"); static void debugfs_create_ul(const char *name, umode_t mode, struct dentry *parent, unsigned long *value) { debugfs_create_file(name, mode, parent, value, &fops_ul); } #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER static int debugfs_stacktrace_depth_set(void *data, u64 val) { *(unsigned long *)data = min_t(unsigned long, val, MAX_STACK_TRACE_DEPTH); return 0; } DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get, debugfs_stacktrace_depth_set, "%llu\n"); static void debugfs_create_stacktrace_depth(const char *name, umode_t mode, struct dentry *parent, unsigned long *value) { debugfs_create_file(name, mode, parent, value, &fops_stacktrace_depth); } #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */ struct dentry *fault_create_debugfs_attr(const char *name, struct dentry *parent, struct fault_attr *attr) { umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; struct dentry *dir; dir = debugfs_create_dir(name, parent); if (IS_ERR(dir)) return dir; debugfs_create_ul("probability", mode, dir, &attr->probability); debugfs_create_ul("interval", mode, dir, &attr->interval); debugfs_create_atomic_t("times", mode, dir, &attr->times); debugfs_create_atomic_t("space", mode, dir, &attr->space); debugfs_create_ul("verbose", mode, dir, &attr->verbose); debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir, &attr->ratelimit_state.interval); debugfs_create_u32("verbose_ratelimit_burst", mode, dir, &attr->ratelimit_state.burst); debugfs_create_bool("task-filter", mode, dir, &attr->task_filter); #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir, &attr->stacktrace_depth); debugfs_create_xul("require-start", mode, dir, &attr->require_start); debugfs_create_xul("require-end", mode, dir, &attr->require_end); debugfs_create_xul("reject-start", mode, dir, &attr->reject_start); debugfs_create_xul("reject-end", mode, dir, &attr->reject_end); #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */ attr->dname = dget(dir); return dir; } EXPORT_SYMBOL_GPL(fault_create_debugfs_attr); #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ #ifdef CONFIG_FAULT_INJECTION_CONFIGFS /* These configfs attribute utilities are copied from drivers/block/null_blk/main.c */ static ssize_t fault_uint_attr_show(unsigned int val, char *page) { return snprintf(page, PAGE_SIZE, "%u\n", val); } static ssize_t fault_ulong_attr_show(unsigned long val, char *page) { return snprintf(page, PAGE_SIZE, "%lu\n", val); } static ssize_t fault_bool_attr_show(bool val, char *page) { return snprintf(page, PAGE_SIZE, "%u\n", val); } static ssize_t fault_atomic_t_attr_show(atomic_t val, char *page) { return snprintf(page, PAGE_SIZE, "%d\n", atomic_read(&val)); } static ssize_t fault_uint_attr_store(unsigned int *val, const char *page, size_t count) { unsigned int tmp; int result; result = kstrtouint(page, 0, &tmp); if (result < 0) return result; *val = tmp; return count; } static ssize_t fault_ulong_attr_store(unsigned long *val, const char *page, size_t count) { int result; unsigned long tmp; result = kstrtoul(page, 0, &tmp); if (result < 0) return result; *val = tmp; return count; } static ssize_t fault_bool_attr_store(bool *val, const char *page, size_t count) { bool tmp; int result; result = kstrtobool(page, &tmp); if (result < 0) return result; *val = tmp; return count; } static ssize_t fault_atomic_t_attr_store(atomic_t *val, const char *page, size_t count) { int tmp; int result; result = kstrtoint(page, 0, &tmp); if (result < 0) return result; atomic_set(val, tmp); return count; } #define CONFIGFS_ATTR_NAMED(_pfx, _name, _attr_name) \ static struct configfs_attribute _pfx##attr_##_name = { \ .ca_name = _attr_name, \ .ca_mode = 0644, \ .ca_owner = THIS_MODULE, \ .show = _pfx##_name##_show, \ .store = _pfx##_name##_store, \ } static struct fault_config *to_fault_config(struct config_item *item) { return container_of(to_config_group(item), struct fault_config, group); } #define FAULT_CONFIGFS_ATTR_NAMED(NAME, ATTR_NAME, MEMBER, TYPE) \ static ssize_t fault_##NAME##_show(struct config_item *item, char *page) \ { \ return fault_##TYPE##_attr_show(to_fault_config(item)->attr.MEMBER, page); \ } \ static ssize_t fault_##NAME##_store(struct config_item *item, const char *page, size_t count) \ { \ struct fault_config *config = to_fault_config(item); \ return fault_##TYPE##_attr_store(&config->attr.MEMBER, page, count); \ } \ CONFIGFS_ATTR_NAMED(fault_, NAME, ATTR_NAME) #define FAULT_CONFIGFS_ATTR(NAME, TYPE) \ FAULT_CONFIGFS_ATTR_NAMED(NAME, __stringify(NAME), NAME, TYPE) FAULT_CONFIGFS_ATTR(probability, ulong); FAULT_CONFIGFS_ATTR(interval, ulong); FAULT_CONFIGFS_ATTR(times, atomic_t); FAULT_CONFIGFS_ATTR(space, atomic_t); FAULT_CONFIGFS_ATTR(verbose, ulong); FAULT_CONFIGFS_ATTR_NAMED(ratelimit_interval, "verbose_ratelimit_interval_ms", ratelimit_state.interval, uint); FAULT_CONFIGFS_ATTR_NAMED(ratelimit_burst, "verbose_ratelimit_burst", ratelimit_state.burst, uint); FAULT_CONFIGFS_ATTR_NAMED(task_filter, "task-filter", task_filter, bool); #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER static ssize_t fault_stacktrace_depth_show(struct config_item *item, char *page) { return fault_ulong_attr_show(to_fault_config(item)->attr.stacktrace_depth, page); } static ssize_t fault_stacktrace_depth_store(struct config_item *item, const char *page, size_t count) { int result; unsigned long tmp; result = kstrtoul(page, 0, &tmp); if (result < 0) return result; to_fault_config(item)->attr.stacktrace_depth = min_t(unsigned long, tmp, MAX_STACK_TRACE_DEPTH); return count; } CONFIGFS_ATTR_NAMED(fault_, stacktrace_depth, "stacktrace-depth"); static ssize_t fault_xul_attr_show(unsigned long val, char *page) { return snprintf(page, PAGE_SIZE, sizeof(val) == sizeof(u32) ? "0x%08lx\n" : "0x%016lx\n", val); } static ssize_t fault_xul_attr_store(unsigned long *val, const char *page, size_t count) { return fault_ulong_attr_store(val, page, count); } FAULT_CONFIGFS_ATTR_NAMED(require_start, "require-start", require_start, xul); FAULT_CONFIGFS_ATTR_NAMED(require_end, "require-end", require_end, xul); FAULT_CONFIGFS_ATTR_NAMED(reject_start, "reject-start", reject_start, xul); FAULT_CONFIGFS_ATTR_NAMED(reject_end, "reject-end", reject_end, xul); #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */ static struct configfs_attribute *fault_config_attrs[] = { &fault_attr_probability, &fault_attr_interval, &fault_attr_times, &fault_attr_space, &fault_attr_verbose, &fault_attr_ratelimit_interval, &fault_attr_ratelimit_burst, &fault_attr_task_filter, #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER &fault_attr_stacktrace_depth, &fault_attr_require_start, &fault_attr_require_end, &fault_attr_reject_start, &fault_attr_reject_end, #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */ NULL, }; static const struct config_item_type fault_config_type = { .ct_attrs = fault_config_attrs, .ct_owner = THIS_MODULE, }; void fault_config_init(struct fault_config *config, const char *name) { config_group_init_type_name(&config->group, name, &fault_config_type); } EXPORT_SYMBOL_GPL(fault_config_init); #endif /* CONFIG_FAULT_INJECTION_CONFIGFS */
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