cregit-Linux how code gets into the kernel

Release 4.15 kernel/trace/trace_kprobe.c

Directory: kernel/trace
/*
 * Kprobes-based tracing events
 *
 * Created by Masami Hiramatsu <mhiramat@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#define pr_fmt(fmt)	"trace_kprobe: " fmt

#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/rculist.h>

#include "trace_probe.h"


#define KPROBE_EVENT_SYSTEM "kprobes"

#define KRETPROBE_MAXACTIVE_MAX 4096

/**
 * Kprobe event core functions
 */

struct trace_kprobe {
	
struct list_head	list;
	
struct kretprobe	rp;	/* Use rp.kp for kprobe use */
	
unsigned long __percpu *nhit;
	
const char		*symbol;	/* symbol name */
	
struct trace_probe	tp;
};


#define SIZEOF_TRACE_KPROBE(n)				\
	(offsetof(struct trace_kprobe, tp.args) +       \
        (sizeof(struct probe_arg) * (n)))



static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk) { return tk->rp.handler != NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju1047.62%120.00%
Masami Hiramatsu733.33%360.00%
Namhyung Kim419.05%120.00%
Total21100.00%5100.00%


static nokprobe_inline const char *trace_kprobe_symbol(struct trace_kprobe *tk) { return tk->symbol ? tk->symbol : "unknown"; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju1248.00%125.00%
Masami Hiramatsu832.00%250.00%
Namhyung Kim520.00%125.00%
Total25100.00%4100.00%


static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk) { return tk->rp.kp.offset; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju1150.00%125.00%
Masami Hiramatsu731.82%250.00%
Namhyung Kim418.18%125.00%
Total22100.00%4100.00%


static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk) { return !!(kprobe_gone(&tk->rp.kp)); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu1244.44%250.00%
Srikar Dronamraju1140.74%125.00%
Namhyung Kim414.81%125.00%
Total27100.00%4100.00%


static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk, struct module *mod) { int len = strlen(mod->name); const char *name = trace_kprobe_symbol(tk); return strncmp(mod->name, name, len) == 0 && name[len] == ':'; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju4374.14%125.00%
Masami Hiramatsu1017.24%250.00%
Namhyung Kim58.62%125.00%
Total58100.00%4100.00%


static nokprobe_inline bool trace_kprobe_is_on_module(struct trace_kprobe *tk) { return !!strchr(trace_kprobe_symbol(tk), ':'); }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju1352.00%125.00%
Masami Hiramatsu728.00%250.00%
Namhyung Kim520.00%125.00%
Total25100.00%4100.00%


static nokprobe_inline unsigned long trace_kprobe_nhit(struct trace_kprobe *tk) { unsigned long nhit = 0; int cpu; for_each_possible_cpu(cpu) nhit += *per_cpu_ptr(tk->nhit, cpu); return nhit; }

Contributors

PersonTokensPropCommitsCommitProp
Marcin Nowakowski41100.00%1100.00%
Total41100.00%1100.00%

static int register_kprobe_event(struct trace_kprobe *tk); static int unregister_kprobe_event(struct trace_kprobe *tk); static DEFINE_MUTEX(probe_lock); static LIST_HEAD(probe_list); static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); static int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs); /* Memory fetching by symbol */ struct symbol_cache { char *symbol; long offset; unsigned long addr; };
unsigned long update_symbol_cache(struct symbol_cache *sc) { sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); if (sc->addr) sc->addr += sc->offset; return sc->addr; }

Contributors

PersonTokensPropCommitsCommitProp
Namhyung Kim45100.00%1100.00%
Total45100.00%1100.00%


void free_symbol_cache(struct symbol_cache *sc) { kfree(sc->symbol); kfree(sc); }

Contributors

PersonTokensPropCommitsCommitProp
Namhyung Kim22100.00%1100.00%
Total22100.00%1100.00%


struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) { struct symbol_cache *sc; if (!sym || strlen(sym) == 0) return NULL; sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); if (!sc) return NULL; sc->symbol = kstrdup(sym, GFP_KERNEL); if (!sc->symbol) { kfree(sc); return NULL; } sc->offset = offset; update_symbol_cache(sc); return sc; }

Contributors

PersonTokensPropCommitsCommitProp
Namhyung Kim98100.00%1100.00%
Total98100.00%1100.00%

/* * Kprobes-specific fetch functions */ #define DEFINE_FETCH_stack(type) \ static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs, \ void *offset, void *dest) \ { \ *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \ (unsigned int)((unsigned long)offset)); \ } \ NOKPROBE_SYMBOL(FETCH_FUNC_NAME(stack, type)); DEFINE_BASIC_FETCH_FUNCS(stack) /* No string on the stack entry */ #define fetch_stack_string NULL #define fetch_stack_string_size NULL #define DEFINE_FETCH_memory(type) \ static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs, \ void *addr, void *dest) \ { \ type retval; \ if (probe_kernel_address(addr, retval)) \ *(type *)dest = 0; \ else \ *(type *)dest = retval; \ } \ NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, type)); DEFINE_BASIC_FETCH_FUNCS(memory) /* * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max * length and relative data location. */ static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, void *addr, void *dest) { int maxlen = get_rloc_len(*(u32 *)dest); u8 *dst = get_rloc_data(dest); long ret; if (!maxlen) return; /* * Try to get string again, since the string can be changed while * probing. */ ret = strncpy_from_unsafe(dst, addr, maxlen); if (ret < 0) { /* Failed to fetch string */ dst[0] = '\0'; *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest)); } else { *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(*(u32 *)dest)); } } NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string)); /* Return the length of string -- including null terminal byte */ static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, void *addr, void *dest) { mm_segment_t old_fs; int ret, len = 0; u8 c; old_fs = get_fs(); set_fs(KERNEL_DS); pagefault_disable(); do { ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1); len++; } while (c && ret == 0 && len < MAX_STRING_SIZE); pagefault_enable(); set_fs(old_fs); if (ret < 0) /* Failed to check the length */ *(u32 *)dest = 0; else *(u32 *)dest = len; } NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string_size)); #define DEFINE_FETCH_symbol(type) \ void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, void *data, void *dest)\ { \ struct symbol_cache *sc = data; \ if (sc->addr) \ fetch_memory_##type(regs, (void *)sc->addr, dest); \ else \ *(type *)dest = 0; \ } \ NOKPROBE_SYMBOL(FETCH_FUNC_NAME(symbol, type)); DEFINE_BASIC_FETCH_FUNCS(symbol) DEFINE_FETCH_symbol(string) DEFINE_FETCH_symbol(string_size) /* kprobes don't support file_offset fetch methods */ #define fetch_file_offset_u8 NULL #define fetch_file_offset_u16 NULL #define fetch_file_offset_u32 NULL #define fetch_file_offset_u64 NULL #define fetch_file_offset_string NULL #define fetch_file_offset_string_size NULL /* Fetch type information table */ static const struct fetch_type kprobes_fetch_type_table[] = { /* Special types */ [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1, "__data_loc char[]"), [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, string_size, sizeof(u32), 0, "u32"), /* Basic types */ ASSIGN_FETCH_TYPE(u8, u8, 0), ASSIGN_FETCH_TYPE(u16, u16, 0), ASSIGN_FETCH_TYPE(u32, u32, 0), ASSIGN_FETCH_TYPE(u64, u64, 0), ASSIGN_FETCH_TYPE(s8, u8, 1), ASSIGN_FETCH_TYPE(s16, u16, 1), ASSIGN_FETCH_TYPE(s32, u32, 1), ASSIGN_FETCH_TYPE(s64, u64, 1), ASSIGN_FETCH_TYPE_ALIAS(x8, u8, u8, 0), ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0), ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0), ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0), ASSIGN_FETCH_TYPE_END }; /* * Allocate new trace_probe and initialize it (including kprobes). */
static struct trace_kprobe *alloc_trace_kprobe(const char *group, const char *event, void *addr, const char *symbol, unsigned long offs, int maxactive, int nargs, bool is_return) { struct trace_kprobe *tk; int ret = -ENOMEM; tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL); if (!tk) return ERR_PTR(ret); tk->nhit = alloc_percpu(unsigned long); if (!tk->nhit) goto error; if (symbol) { tk->symbol = kstrdup(symbol, GFP_KERNEL); if (!tk->symbol) goto error; tk->rp.kp.symbol_name = tk->symbol; tk->rp.kp.offset = offs; } else tk->rp.kp.addr = addr; if (is_return) tk->rp.handler = kretprobe_dispatcher; else tk->rp.kp.pre_handler = kprobe_dispatcher; tk->rp.maxactive = maxactive; if (!event || !is_good_name(event)) { ret = -EINVAL; goto error; } tk->tp.call.class = &tk->tp.class; tk->tp.call.name = kstrdup(event, GFP_KERNEL); if (!tk->tp.call.name) goto error; if (!group || !is_good_name(group)) { ret = -EINVAL; goto error; } tk->tp.class.system = kstrdup(group, GFP_KERNEL); if (!tk->tp.class.system) goto error; INIT_LIST_HEAD(&tk->list); INIT_LIST_HEAD(&tk->tp.files); return tk; error: kfree(tk->tp.call.name); kfree(tk->symbol); free_percpu(tk->nhit); kfree(tk); return ERR_PTR(ret); }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju18551.68%17.69%
Masami Hiramatsu8523.74%753.85%
Namhyung Kim4312.01%17.69%
Martin KaFai Lau267.26%17.69%
Alban Crequy113.07%17.69%
Oleg Nesterov71.96%17.69%
Steven Rostedt10.28%17.69%
Total358100.00%13100.00%


static void free_trace_kprobe(struct trace_kprobe *tk) { int i; for (i = 0; i < tk->tp.nr_args; i++) traceprobe_free_probe_arg(&tk->tp.args[i]); kfree(tk->tp.call.class->system); kfree(tk->tp.call.name); kfree(tk->symbol); free_percpu(tk->nhit); kfree(tk); }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju3944.83%120.00%
Masami Hiramatsu2427.59%240.00%
Namhyung Kim1719.54%120.00%
Martin KaFai Lau78.05%120.00%
Total87100.00%5100.00%


static struct trace_kprobe *find_trace_kprobe(const char *event, const char *group) { struct trace_kprobe *tk; list_for_each_entry(tk, &probe_list, list) if (strcmp(trace_event_name(&tk->tp.call), event) == 0 && strcmp(tk->tp.call.class->system, group) == 0) return tk; return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju3142.47%120.00%
Masami Hiramatsu2635.62%120.00%
Namhyung Kim1216.44%120.00%
Mathieu Desnoyers34.11%120.00%
Steven Rostedt11.37%120.00%
Total73100.00%5100.00%

/* * Enable trace_probe * if the file is NULL, enable "perf" handler, or enable "trace" handler. */
static int enable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) { int ret = 0; if (file) { struct event_file_link *link; link = kmalloc(sizeof(*link), GFP_KERNEL); if (!link) { ret = -ENOMEM; goto out; } link->file = file; list_add_tail_rcu(&link->list, &tk->tp.files); tk->tp.flags |= TP_FLAG_TRACE; } else tk->tp.flags |= TP_FLAG_PROFILE; if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) { if (trace_kprobe_is_return(tk)) ret = enable_kretprobe(&tk->rp); else ret = enable_kprobe(&tk->rp.kp); } out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu9059.60%654.55%
Srikar Dronamraju2113.91%19.09%
Namhyung Kim2113.91%19.09%
Oleg Nesterov1811.92%218.18%
Steven Rostedt10.66%19.09%
Total151100.00%11100.00%

/* * Disable trace_probe * if the file is NULL, disable "perf" handler, or disable "trace" handler. */
static int disable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) { struct event_file_link *link = NULL; int wait = 0; int ret = 0; if (file) { link = find_event_file_link(&tk->tp, file); if (!link) { ret = -EINVAL; goto out; } list_del_rcu(&link->list); wait = 1; if (!list_empty(&tk->tp.files)) goto out; tk->tp.flags &= ~TP_FLAG_TRACE; } else tk->tp.flags &= ~TP_FLAG_PROFILE; if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) { if (trace_kprobe_is_return(tk)) disable_kretprobe(&tk->rp); else disable_kprobe(&tk->rp.kp); wait = 1; } out: if (wait) { /* * Synchronize with kprobe_trace_func/kretprobe_trace_func * to ensure disabled (all running handlers are finished). * This is not only for kfree(), but also the caller, * trace_remove_event_call() supposes it for releasing * event_call related objects, which will be accessed in * the kprobe_trace_func/kretprobe_trace_func. */ synchronize_sched(); kfree(link); /* Ignored if link == NULL */ } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu11361.08%550.00%
Oleg Nesterov2513.51%220.00%
Namhyung Kim2513.51%110.00%
Srikar Dronamraju2111.35%110.00%
Steven Rostedt10.54%110.00%
Total185100.00%10100.00%

/* Internal register function - just handle k*probes and flags */
static int __register_trace_kprobe(struct trace_kprobe *tk) { int i, ret; if (trace_probe_is_registered(&tk->tp)) return -EINVAL; for (i = 0; i < tk->tp.nr_args; i++) traceprobe_update_arg(&tk->tp.args[i]); /* Set/clear disabled flag according to tp->flag */ if (trace_probe_is_enabled(&tk->tp)) tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; else tk->rp.kp.flags |= KPROBE_FLAG_DISABLED; if (trace_kprobe_is_return(tk)) ret = register_kretprobe(&tk->rp); else ret = register_kprobe(&tk->rp.kp); if (ret == 0) tk->tp.flags |= TP_FLAG_REGISTERED; else { pr_warn("Could not insert probe at %s+%lu: %d\n", trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret); if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) { pr_warn("This probe might be able to register after target module is loaded. Continue.\n"); ret = 0; } else if (ret == -EILSEQ) { pr_warn("Probing address(0x%p) is not an instruction boundary.\n", tk->rp.kp.addr); ret = -EINVAL; } } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju10951.66%116.67%
Masami Hiramatsu6631.28%350.00%
Namhyung Kim3114.69%116.67%
Joe Perches52.37%116.67%
Total211100.00%6100.00%

/* Internal unregister function - just handle k*probes and flags */
static void __unregister_trace_kprobe(struct trace_kprobe *tk) { if (trace_probe_is_registered(&tk->tp)) { if (trace_kprobe_is_return(tk)) unregister_kretprobe(&tk->rp); else unregister_kprobe(&tk->rp.kp); tk->tp.flags &= ~TP_FLAG_REGISTERED; /* Cleanup kprobe for reuse */ if (tk->rp.kp.symbol_name) tk->rp.kp.addr = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju4050.63%133.33%
Masami Hiramatsu2430.38%133.33%
Namhyung Kim1518.99%133.33%
Total79100.00%3100.00%

/* Unregister a trace_probe and probe_event: call with locking probe_lock */
static int unregister_trace_kprobe(struct trace_kprobe *tk) { /* Enabled event can not be unregistered */ if (trace_probe_is_enabled(&tk->tp)) return -EBUSY; /* Will fail if probe is being used by ftrace or perf */ if (unregister_kprobe_event(tk)) return -EBUSY; __unregister_trace_kprobe(tk); list_del(&tk->list); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju1935.19%125.00%
Masami Hiramatsu1425.93%125.00%
Namhyung Kim1120.37%125.00%
Steven Rostedt1018.52%125.00%
Total54100.00%4100.00%

/* Register a trace_probe and probe_event */
static int register_trace_kprobe(struct trace_kprobe *tk) { struct trace_kprobe *old_tk; int ret; mutex_lock(&probe_lock); /* Delete old (same name) event if exist */ old_tk = find_trace_kprobe(trace_event_name(&tk->tp.call), tk->tp.call.class->system); if (old_tk) { ret = unregister_trace_kprobe(old_tk); if (ret < 0) goto end; free_trace_kprobe(old_tk); } /* Register new event */ ret = register_kprobe_event(tk); if (ret) { pr_warn("Failed to register probe event(%d)\n", ret); goto end; } /* Register k*probe */ ret = __register_trace_kprobe(tk); if (ret < 0) unregister_kprobe_event(tk); else list_add_tail(&tk->list, &probe_list); end: mutex_unlock(&probe_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu5940.97%444.44%
Srikar Dronamraju5538.19%111.11%
Namhyung Kim2517.36%111.11%
Mathieu Desnoyers32.08%111.11%
Steven Rostedt10.69%111.11%
Joe Perches10.69%111.11%
Total144100.00%9100.00%

/* Module notifier call back, checking event on the module */
static int trace_kprobe_module_callback(struct notifier_block *nb, unsigned long val, void *data) { struct module *mod = data; struct trace_kprobe *tk; int ret; if (val != MODULE_STATE_COMING) return NOTIFY_DONE; /* Update probes on coming module */ mutex_lock(&probe_lock); list_for_each_entry(tk, &probe_list, list) { if (trace_kprobe_within_module(tk, mod)) { /* Don't need to check busy - this should have gone. */ __unregister_trace_kprobe(tk); ret = __register_trace_kprobe(tk); if (ret) pr_warn("Failed to re-register probe %s on %s: %d\n", trace_event_name(&tk->tp.call), mod->name, ret); } } mutex_unlock(&probe_lock); return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
Srikar Dronamraju7160.17%116.67%
Masami Hiramatsu2823.73%116.67%
Namhyung Kim1311.02%116.67%
Mathieu Desnoyers32.54%116.67%
Joe Perches21.69%116.67%
Steven Rostedt10.85%116.67%
Total118100.00%6100.00%

static struct notifier_block trace_kprobe_module_nb = { .notifier_call = trace_kprobe_module_callback, .priority = 1 /* Invoked after kprobe module callback */ }; /* Convert certain expected symbols into '_' when generating event names */
static inline void sanitize_event_name(char *name) { while (*name++ != '\0') if (*name == ':' || *name == '.') *name = '_'; }

Contributors

PersonTokensPropCommitsCommitProp
Naveen N. Rao36100.00%1100.00%
Total36100.00%1100.00%


static int create_trace_kprobe(int argc, char **argv) { /* * Argument syntax: * - Add kprobe: * p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] * - Add kretprobe: * r[MAXACTIVE][:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] * Fetch args: * $retval : fetch return value * $stack : fetch stack address * $stackN : fetch Nth of stack (N:0-) * $comm : fetch current task comm * @ADDR : fetch memory at ADDR (ADDR should be in kernel) * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) * %REG : fetch register REG * Dereferencing memory fetch: * +|-offs(ARG) : fetch memory at ARG +|- offs address. * Alias name of args: * NAME=FETCHARG : set NAME as alias of FETCHARG. * Type of args: * FETCHARG:TYPE : use TYPE instead of unsigned long. */ struct trace_kprobe *tk; int i, ret = 0; bool is_return = false, is_delete = false; char *symbol = NULL, *event = NULL, *group = NULL; int maxactive = 0; char *arg; unsigned long offset = 0; void *addr = NULL; char buf[MAX_EVENT_NAME_LEN]; /* argc must be >= 1 */ if (argv[0][0] == 'p') is_return = false; else if (argv[0][0] == 'r') is_return = true; else if (argv[0][0] == '-') is_delete = true; else { pr_info("Probe definition must be started with 'p', 'r' or" " '-'.\n"); return -EINVAL; } event = strchr(&argv[0][1], ':'); if (event) { event[0] = '\0'; event++; } if (is_return && isdigit(argv[0][1])) { ret = kstrtouint(&argv[0][1], 0, &maxactive); if (ret) { pr_info("Failed to parse maxactive.\n"); return ret; } /* kretprobes instances are iterated over via a list. The * maximum should stay reasonable. */ if (maxactive > KRETPROBE_MAXACTIVE_MAX) { pr_info("Maxactive is too big (%d > %d).\n", maxactive, KRETPROBE_MAXACTIVE_MAX); return -E2BIG; } } if (event) { if (strchr(event, '/')) { group = event; event = strchr(group, '/') + 1; event[-1] = '\0'; if (strlen(group) == 0) { pr_info("Group name is not specified\n"); return -EINVAL; } } if (strlen(event) == 0) { pr_info("Event name is not specified\n"); return -EINVAL; } } if (!group) group = KPROBE_EVENT_SYSTEM; if (is_delete) { if (!event) { pr_info("Delete command needs an event name.\n"); return -EINVAL; } mutex_lock(&probe_lock); tk = find_trace_kprobe(event, group); if (!tk) { mutex_unlock(&probe_lock); pr_info("Event %s/%s doesn't exist.\n", group, event); return -ENOENT; } /* delete an event */ ret = unregister_trace_kprobe(tk); if (ret == 0) free_trace_kprobe(tk); mutex_unlock(&probe_lock); return ret; } if (argc < 2) { pr_info("Probe point is not specified.\n"); return -EINVAL; } /* try to parse an address. if that fails, try to read the * input as a symbol. */ if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) { /* a symbol specified */ symbol = argv[1]; /* TODO: support .init module functions */ ret = traceprobe_split_symbol_offset(symbol, &offset); if (ret) { pr_info("Failed to parse either an address or a symbol.\n"); return ret; } if (offset && is_return && !kprobe_on_func_entry(NULL, symbol, offset)) { pr_info("Given offset is not valid for return probe.\n"); return -EINVAL; } } argc -= 2; argv += 2; /* setup a probe */ if (!event) { /* Make a new event name */ if (symbol) snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", is_return ? 'r' : 'p', symbol, offset); else snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", is_return ? 'r' : 'p', addr); sanitize_event_name(buf); event = buf; } tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive, argc, is_return); if (IS_ERR(tk)) { pr_info("Failed to allocate trace_probe.(%d)\n", (int)PTR_ERR(tk)); return PTR_ERR(tk); } /* parse arguments */ ret = 0; for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { struct probe_arg *parg = &tk->tp.args[i]; /* Increment count for freeing args in error case */ tk->tp.nr_args++; /* Parse argument name */ arg = strchr(argv[i], '='); if (arg) { *arg++ = '\0'; parg->name = kstrdup(argv[i], GFP_KERNEL); } else { arg = argv[i]; /* If argument name is omitted, set "argN" */ snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); parg->name = kstrdup(buf, GFP_KERNEL); } if (!parg->name) { pr_info("Failed to allocate argument[%d] name.\n", i); ret = -ENOMEM; goto error; } if (!is_good_name(parg->name)) { pr_info("Invalid argument[%d] name: %s\n", i, parg->name); ret = -EINVAL; goto error; } if (traceprobe_conflict_field_name(parg->name, tk->tp.args, i)) { pr_info("Argument[%d] name '%s' conflicts with " "another field.\n", i, argv[i]); ret = -EINVAL; goto error; } /* Parse fetch argument */ ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg, is_return, true, kprobes_fetch_type_table); if (ret) { pr_info("Parse error at argument[%d]. (%d)\n", i, ret); goto error; } } ret = register_trace_kprobe(tk); if (ret) goto error; return 0; error: free_trace_kprobe(tk); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu72377.99%1751.52%
Alban Crequy9710.46%13.03%
Namhyung Kim505.39%13.03%
Srikar Dronamraju323.45%412.12%
Naveen N. Rao101.08%39.09%
Steven Rostedt60.65%13.03%
Wenji Huang20.22%13.03%
Sabrina Dubroca20.22%13.03%
Stephen Rothwell20.22%13.03%
Heiko Carstens10.11%13.03%
Lai Jiangshan10.11%13.03%
Daniel Walter10.11%13.03%
Total927100.00%33100.00%


static int release_all_trace_kprobes(void) { struct trace_kprobe *tk; int ret = 0; mutex_lock(&probe_lock); /* Ensure no probe is in use. */ list_for_each_entry(tk, &probe_list, list) if (trace_probe_is_enabled(&tk->tp)) { ret = -EBUSY; goto end; } /* TODO: Use batch unregistration */ while (!list_empty(&probe_list)) { tk = list_entry(probe_list.next, struct trace_kprobe, list); ret = unregister_trace_kprobe(tk); if (ret) goto end; free_trace_kprobe(tk); } end: mutex_unlock(&probe_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu8779.82%250.00%
Namhyung Kim1311.93%125.00%
Steven Rostedt98.26%125.00%
Total109100.00%4100.00%

/* Probes listing interfaces */
static void *probes_seq_start(struct seq_file *m, loff_t *pos) { mutex_lock(&probe_lock); return seq_list_start(&probe_list, *pos); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu32100.00%1100.00%
Total32100.00%1100.00%


static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) { return seq_list_next(v, &probe_list, pos); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu31100.00%1100.00%
Total31100.00%1100.00%


static void probes_seq_stop(struct seq_file *m, void *v) { mutex_unlock(&probe_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu21100.00%1100.00%
Total21100.00%1100.00%


static int probes_seq_show(struct seq_file *m, void *v) { struct trace_kprobe *tk = v; int i; seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p'); seq_printf(m, ":%s/%s", tk->tp.call.class->system, trace_event_name(&tk->tp.call)); if (!tk->symbol) seq_printf(m, " 0x%p", tk->rp.kp.addr); else if (tk->rp.kp.offset) seq_printf(m, " %s+%u", trace_kprobe_symbol(tk), tk->rp.kp.offset); else seq_printf(m, " %s", trace_kprobe_symbol(tk)); for (i = 0; i < tk->tp.nr_args; i++) seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm); seq_putc(m, '\n'); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu11862.77%541.67%
Lai Jiangshan3418.09%216.67%
Namhyung Kim2714.36%18.33%
Rasmus Villemoes31.60%18.33%
Steven Rostedt31.60%216.67%
Mathieu Desnoyers31.60%18.33%
Total188100.00%12100.00%

static const struct seq_operations probes_seq_op = { .start = probes_seq_start, .next = probes_seq_next, .stop = probes_seq_stop, .show = probes_seq_show };
static int probes_open(struct inode *inode, struct file *file) { int ret; if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { ret = release_all_trace_kprobes(); if (ret < 0) return ret; } return seq_open(file, &probes_seq_op); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu6198.39%266.67%
Namhyung Kim11.61%133.33%
Total62100.00%3100.00%


static ssize_t probes_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { return trace_parse_run_command(file, buffer, count, ppos, create_trace_kprobe); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu3489.47%240.00%
Srikar Dronamraju25.26%120.00%
Namhyung Kim12.63%120.00%
Tom Zanussi12.63%120.00%
Total38100.00%5100.00%

static const struct file_operations kprobe_events_ops = { .owner = THIS_MODULE, .open = probes_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, .write = probes_write, }; /* Probes profiling interfaces */
static int probes_profile_seq_show(struct seq_file *m, void *v) { struct trace_kprobe *tk = v; seq_printf(m, " %-44s %15lu %15lu\n", trace_event_name(&tk->tp.call), trace_kprobe_nhit(tk), tk->rp.kp.nmissed); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu4174.55%120.00%
Namhyung Kim610.91%120.00%
Marcin Nowakowski47.27%120.00%
Mathieu Desnoyers35.45%120.00%
Steven Rostedt11.82%120.00%
Total55100.00%5100.00%

static const struct seq_operations profile_seq_op = { .start = probes_seq_start, .next = probes_seq_next, .stop = probes_seq_stop, .show = probes_profile_seq_show };
static int profile_open(struct inode *inode, struct file *file) { return seq_open(file, &profile_seq_op); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu25100.00%2100.00%
Total25100.00%2100.00%

static const struct file_operations kprobe_profile_ops = { .owner = THIS_MODULE, .open = profile_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; /* Kprobe handler */
static nokprobe_inline void __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, struct trace_event_file *trace_file) { struct kprobe_trace_entry_head *entry; struct ring_buffer_event *event; struct ring_buffer *buffer; int size, dsize, pc; unsigned long irq_flags; struct trace_event_call *call = &tk->tp.call; WARN_ON(call != trace_file->event_call); if (trace_trigger_soft_disabled(trace_file)) return; local_save_flags(irq_flags); pc = preempt_count(); dsize = __get_data_size(&tk->tp, regs); size = sizeof(*entry) + tk->tp.size + dsize; event = trace_event_buffer_lock_reserve(&buffer, trace_file, call->event.type, size, irq_flags, pc); if (!event) return; entry = ring_buffer_event_data(event); entry->ip = (unsigned long)tk->rp.kp.addr; store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); event_trigger_unlock_commit_regs(trace_file, buffer, event, entry, irq_flags, pc, regs); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu16678.67%1052.63%
Namhyung Kim157.11%15.26%
Steven Rostedt125.69%526.32%
Frédéric Weisbecker83.79%15.26%
Tom Zanussi83.79%15.26%
Xiao Guangrong20.95%15.26%
Total211100.00%19100.00%


static void kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs) { struct event_file_link *link; list_for_each_entry_rcu(link, &tk->tp.files, list) __kprobe_trace_func(tk, regs, link->file); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu2767.50%250.00%
Oleg Nesterov922.50%125.00%
Namhyung Kim410.00%125.00%
Total40100.00%4100.00%

NOKPROBE_SYMBOL(kprobe_trace_func); /* Kretprobe handler */
static nokprobe_inline void __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, struct pt_regs *regs, struct trace_event_file *trace_file) { struct kretprobe_trace_entry_head *entry; struct ring_buffer_event *event; struct ring_buffer *buffer; int size, pc, dsize; unsigned long irq_flags; struct trace_event_call *call = &tk->tp.call; WARN_ON(call != trace_file->event_call); if (trace_trigger_soft_disabled(trace_file)) return; local_save_flags(irq_flags); pc = preempt_count(); dsize = __get_data_size(&tk->tp, regs); size = sizeof(*entry) + tk->tp.size + dsize; event = trace_event_buffer_lock_reserve(&buffer, trace_file, call->event.type, size, irq_flags, pc); if (!event) return; entry = ring_buffer_event_data(event); entry->func = (unsigned long)tk->rp.kp.addr; entry->ret_ip = (unsigned long)ri->ret_addr; store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); event_trigger_unlock_commit_regs(trace_file, buffer, event, entry, irq_flags, pc, regs); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu18380.26%1155.00%
Namhyung Kim156.58%15.00%
Steven Rostedt125.26%525.00%
Tom Zanussi83.51%15.00%
Frédéric Weisbecker83.51%15.00%
Xiao Guangrong20.88%15.00%
Total228100.00%20100.00%


static void kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, struct pt_regs *regs) { struct event_file_link *link; list_for_each_entry_rcu(link, &tk->tp.files, list) __kretprobe_trace_func(tk, ri, regs, link->file); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu3472.34%250.00%
Oleg Nesterov919.15%125.00%
Namhyung Kim48.51%125.00%
Total47100.00%4100.00%

NOKPROBE_SYMBOL(kretprobe_trace_func); /* Event entry printers */
static enum print_line_t print_kprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event) { struct kprobe_trace_entry_head *field; struct trace_seq *s = &iter->seq; struct trace_probe *tp; u8 *data; int i; field = (struct kprobe_trace_entry_head *)iter->ent; tp = container_of(event, struct trace_probe, call.event); trace_seq_printf(s, "%s: (", trace_event_name(&tp->call)); if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) goto out; trace_seq_putc(s, ')'); data = (u8 *)&field[1]; for (i = 0; i < tp->nr_args; i++) if (!tp->args[i].type->print(s, tp->args[i].name, data + tp->args[i].offset, field)) goto out; trace_seq_putc(s, '\n'); out: return trace_handle_return(s); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu17287.31%753.85%
Steven Rostedt189.14%430.77%
Rasmus Villemoes42.03%17.69%
Mathieu Desnoyers31.52%17.69%
Total197100.00%13100.00%


static enum print_line_t print_kretprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event) { struct kretprobe_trace_entry_head *field; struct trace_seq *s = &iter->seq; struct trace_probe *tp; u8 *data; int i; field = (struct kretprobe_trace_entry_head *)iter->ent; tp = container_of(event, struct trace_probe, call.event); trace_seq_printf(s, "%s: (", trace_event_name(&tp->call)); if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) goto out; trace_seq_puts(s, " <- "); if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) goto out; trace_seq_putc(s, ')'); data = (u8 *)&field[1]; for (i = 0; i < tp->nr_args; i++) if (!tp->args[i].type->print(s, tp->args[i].name, data + tp->args[i].offset, field)) goto out; trace_seq_putc(s, '\n'); out: return trace_handle_return(s); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu19787.95%753.85%
Steven Rostedt208.93%430.77%
Rasmus Villemoes41.79%17.69%
Mathieu Desnoyers31.34%17.69%
Total224100.00%13100.00%


static int kprobe_event_define_fields(struct trace_event_call *event_call) { int ret, i; struct kprobe_trace_entry_head field; struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); /* Set argument names as fields */ for (i = 0; i < tk->tp.nr_args; i++) { struct probe_arg *parg = &tk->tp.args[i]; ret = trace_define_field(event_call, parg->type->fmttype, parg->name, sizeof(field) + parg->offset, parg->type->size, parg->type->is_signed, FILTER_OTHER); if (ret) return ret; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu10379.23%466.67%
Namhyung Kim2620.00%116.67%
Steven Rostedt10.77%116.67%
Total130100.00%6100.00%


static int kretprobe_event_define_fields(struct trace_event_call *event_call) { int ret, i; struct kretprobe_trace_entry_head field; struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); /* Set argument names as fields */ for (i = 0; i < tk->tp.nr_args; i++) { struct probe_arg *parg = &tk->tp.args[i]; ret = trace_define_field(event_call, parg->type->fmttype, parg->name, sizeof(field) + parg->offset, parg->type->size, parg->type->is_signed, FILTER_OTHER); if (ret) return ret; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu11480.85%571.43%
Namhyung Kim2618.44%114.29%
Steven Rostedt10.71%114.29%
Total141100.00%7100.00%

#ifdef CONFIG_PERF_EVENTS /* Kprobe profile handler */
static void kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs) { struct trace_event_call *call = &tk->tp.call; struct kprobe_trace_entry_head *entry; struct hlist_head *head; int size, __size, dsize; int rctx; if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs)) return; head = this_cpu_ptr(call->perf_events); if (hlist_empty(head)) return; dsize = __get_data_size(&tk->tp, regs); __size = sizeof(*entry) + tk->tp.size + dsize; size = ALIGN(__size + sizeof(u32), sizeof(u64)); size -= sizeof(u32); entry = perf_trace_buf_alloc(size, NULL, &rctx); if (!entry) return; entry->ip = (unsigned long)tk->rp.kp.addr; memset(&entry[1], 0, dsize); store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, head, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu14864.07%830.77%
Oleg Nesterov166.93%13.85%
Namhyung Kim156.49%13.85%
Alexei Starovoitov135.63%27.69%
Peter Zijlstra104.33%519.23%
Xiao Guangrong93.90%13.85%
David S. Miller62.60%13.85%
Yonghong Song52.16%13.85%
Frédéric Weisbecker52.16%311.54%
Andrey Vagin20.87%13.85%
Josef Bacik10.43%13.85%
Steven Rostedt10.43%13.85%
Total231100.00%26100.00%

NOKPROBE_SYMBOL(kprobe_perf_func); /* Kretprobe profile handler */
static void kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, struct pt_regs *regs) { struct trace_event_call *call = &tk->tp.call; struct kretprobe_trace_entry_head *entry; struct hlist_head *head; int size, __size, dsize; int rctx; if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs)) return; head = this_cpu_ptr(call->perf_events); if (hlist_empty(head)) return; dsize = __get_data_size(&tk->tp, regs); __size = sizeof(*entry) + tk->tp.size + dsize; size = ALIGN(__size + sizeof(u32), sizeof(u64)); size -= sizeof(u32); entry = perf_trace_buf_alloc(size, NULL, &rctx); if (!entry) return; entry->func = (unsigned long)tk->rp.kp.addr; entry->ret_ip = (unsigned long)ri->ret_addr; store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, head, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu14762.55%627.27%
Oleg Nesterov177.23%14.55%
Alexei Starovoitov177.23%29.09%
Xiao Guangrong166.81%29.09%
Namhyung Kim156.38%14.55%
Peter Zijlstra125.11%522.73%
Yonghong Song52.13%14.55%
Frédéric Weisbecker31.28%29.09%
Andrey Vagin20.85%14.55%
Steven Rostedt10.43%14.55%
Total235100.00%22100.00%

NOKPROBE_SYMBOL(kretprobe_perf_func); #endif /* CONFIG_PERF_EVENTS */ /* * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex. * * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe * lockless, but we can't race with this __init function. */
static int kprobe_register(struct trace_event_call *event, enum trace_reg type, void *data) { struct trace_kprobe *tk = (struct trace_kprobe *)event->data; struct trace_event_file *file = data; switch (type) { case TRACE_REG_REGISTER: return enable_trace_kprobe(tk, file); case TRACE_REG_UNREGISTER: return disable_trace_kprobe(tk, file); #ifdef CONFIG_PERF_EVENTS case TRACE_REG_PERF_REGISTER: return enable_trace_kprobe(tk, NULL); case TRACE_REG_PERF_UNREGISTER: return disable_trace_kprobe(tk, NULL); case TRACE_REG_PERF_OPEN: case TRACE_REG_PERF_CLOSE: case TRACE_REG_PERF_ADD: case TRACE_REG_PERF_DEL: return 0; #endif } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steven Rostedt5548.67%333.33%
Masami Hiramatsu2824.78%333.33%
Jiri Olsa1916.81%222.22%
Namhyung Kim119.73%111.11%
Total113100.00%9100.00%


static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) { struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp); raw_cpu_inc(*tk->nhit); if (tk->tp.flags & TP_FLAG_TRACE) kprobe_trace_func(tk, regs); #ifdef CONFIG_PERF_EVENTS if (tk->tp.flags & TP_FLAG_PROFILE) kprobe_perf_func(tk, regs); #endif return 0; /* We don't tweek kernel, so just return 0 */ }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu6476.19%337.50%
Namhyung Kim1214.29%112.50%
Martin KaFai Lau44.76%112.50%
David S. Miller22.38%112.50%
Frédéric Weisbecker11.19%112.50%
Li Zefan11.19%112.50%
Total84100.00%8100.00%

NOKPROBE_SYMBOL(kprobe_dispatcher);
static int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) { struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp); raw_cpu_inc(*tk->nhit); if (tk->tp.flags & TP_FLAG_TRACE) kretprobe_trace_func(tk, ri, regs); #ifdef CONFIG_PERF_EVENTS if (tk->tp.flags & TP_FLAG_PROFILE) kretprobe_perf_func(tk, ri, regs); #endif return 0; /* We don't tweek kernel, so just return 0 */ }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu7079.55%342.86%
Namhyung Kim1213.64%114.29%
Martin KaFai Lau44.55%114.29%
Li Zefan11.14%114.29%
Frédéric Weisbecker11.14%114.29%
Total88100.00%7100.00%

NOKPROBE_SYMBOL(kretprobe_dispatcher); static struct trace_event_functions kretprobe_funcs = { .trace = print_kretprobe_event }; static struct trace_event_functions kprobe_funcs = { .trace = print_kprobe_event };
static int register_kprobe_event(struct trace_kprobe *tk) { struct trace_event_call *call = &tk->tp.call; int ret; /* Initialize trace_event_call */ INIT_LIST_HEAD(&call->class->fields); if (trace_kprobe_is_return(tk)) { call->event.funcs = &kretprobe_funcs; call->class->define_fields = kretprobe_event_define_fields; } else { call->event.funcs = &kprobe_funcs; call->class->define_fields = kprobe_event_define_fields; } if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) return -ENOMEM; ret = register_trace_event(&call->event); if (!ret) { kfree(call->print_fmt); return -ENODEV; } call->flags = TRACE_EVENT_FL_KPROBE; call->class->reg = kprobe_register; call->data = tk; ret = trace_add_event_call(call); if (ret) { pr_info("Failed to register kprobe event: %s\n", trace_event_name(call)); kfree(call->print_fmt); unregister_trace_event(&call->event); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu9850.78%315.79%
Steven Rostedt4020.73%1052.63%
Lai Jiangshan2814.51%15.26%
Namhyung Kim189.33%210.53%
Li Zefan63.11%15.26%
Mathieu Desnoyers21.04%15.26%
Alexei Starovoitov10.52%15.26%
Total193100.00%19100.00%


static int unregister_kprobe_event(struct trace_kprobe *tk) { int ret; /* tp->event is unregistered in trace_remove_event_call() */ ret = trace_remove_event_call(&tk->tp.call); if (!ret) kfree(tk->tp.call.print_fmt); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu1532.61%240.00%
Steven Rostedt1430.43%120.00%
Namhyung Kim919.57%120.00%
Lai Jiangshan817.39%120.00%
Total46100.00%5100.00%

/* Make a tracefs interface for controlling probe points */
static __init int init_kprobe_trace(void) { struct dentry *d_tracer; struct dentry *entry; if (register_module_notifier(&trace_kprobe_module_nb)) return -EINVAL; d_tracer = tracing_init_dentry(); if (IS_ERR(d_tracer)) return 0; entry = tracefs_create_file("kprobe_events", 0644, d_tracer, NULL, &kprobe_events_ops); /* Event list interface */ if (!entry) pr_warn("Could not create tracefs 'kprobe_events' entry\n"); /* Profile interface */ entry = tracefs_create_file("kprobe_profile", 0444, d_tracer, NULL, &kprobe_profile_ops); if (!entry) pr_warn("Could not create tracefs 'kprobe_profile' entry\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu9390.29%342.86%
Steven Rostedt54.85%228.57%
Joe Perches43.88%114.29%
Namhyung Kim10.97%114.29%
Total103100.00%7100.00%

fs_initcall(init_kprobe_trace); #ifdef CONFIG_FTRACE_STARTUP_TEST /* * The "__used" keeps gcc from removing the function symbol * from the kallsyms table. 'noinline' makes sure that there * isn't an inlined version used by the test method below */
static __used __init noinline int kprobe_trace_selftest_target(int a1, int a2, int a3, int a4, int a5, int a6) { return a1 + a2 + a3 + a4 + a5 + a6; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu3792.50%133.33%
Marcin Nowakowski25.00%133.33%
Steven Rostedt12.50%133.33%
Total40100.00%3100.00%

static __init struct trace_event_file * find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr) { struct trace_event_file *file; list_for_each_entry(file, &tr->events, list) if (file->event_call == &tk->tp.call) return file; return NULL; } /* * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this * stage, we can do this lockless. */
static __init int kprobe_trace_self_tests_init(void) { int ret, warn = 0; int (*target)(int, int, int, int, int, int); struct trace_kprobe *tk; struct trace_event_file *file; if (tracing_is_disabled()) return -ENODEV; target = kprobe_trace_selftest_target; pr_info("Testing kprobe tracing: "); ret = trace_run_command("p:testprobe kprobe_trace_selftest_target " "$stack $stack0 +0($stack)", create_trace_kprobe); if (WARN_ON_ONCE(ret)) { pr_warn("error on probing function entry.\n"); warn++; } else { /* Enable trace point */ tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); if (WARN_ON_ONCE(tk == NULL)) { pr_warn("error on getting new probe.\n"); warn++; } else { file = find_trace_probe_file(tk, top_trace_array()); if (WARN_ON_ONCE(file == NULL)) { pr_warn("error on getting probe file.\n"); warn++; } else enable_trace_kprobe(tk, file); } } ret = trace_run_command("r:testprobe2 kprobe_trace_selftest_target " "$retval", create_trace_kprobe); if (WARN_ON_ONCE(ret)) { pr_warn("error on probing function return.\n"); warn++; } else { /* Enable trace point */ tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); if (WARN_ON_ONCE(tk == NULL)) { pr_warn("error on getting 2nd new probe.\n"); warn++; } else { file = find_trace_probe_file(tk, top_trace_array()); if (WARN_ON_ONCE(file == NULL)) { pr_warn("error on getting probe file.\n"); warn++; } else enable_trace_kprobe(tk, file); } } if (warn) goto end; ret = target(1, 2, 3, 4, 5, 6); /* * Not expecting an error here, the check is only to prevent the * optimizer from removing the call to target() as otherwise there * are no side-effects and the call is never performed. */ if (ret != 21) warn++; /* Disable trace points before removing it */ tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); if (WARN_ON_ONCE(tk == NULL)) { pr_warn("error on getting test probe.\n"); warn++; } else { if (trace_kprobe_nhit(tk) != 1) { pr_warn("incorrect number of testprobe hits\n"); warn++; } file = find_trace_probe_file(tk, top_trace_array()); if (WARN_ON_ONCE(file == NULL)) { pr_warn("error on getting probe file.\n"); warn++; } else disable_trace_kprobe(tk, file); } tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); if (WARN_ON_ONCE(tk == NULL)) { pr_warn("error on getting 2nd test probe.\n"); warn++; } else { if (trace_kprobe_nhit(tk) != 1) { pr_warn("incorrect number of testprobe2 hits\n"); warn++; } file = find_trace_probe_file(tk, top_trace_array()); if (WARN_ON_ONCE(file == NULL)) { pr_warn("error on getting probe file.\n"); warn++; } else disable_trace_kprobe(tk, file); } ret = trace_run_command("-:testprobe", create_trace_kprobe); if (WARN_ON_ONCE(ret)) { pr_warn("error on deleting a probe.\n"); warn++; } ret = trace_run_command("-:testprobe2", create_trace_kprobe); if (WARN_ON_ONCE(ret)) { pr_warn("error on deleting a probe.\n"); warn++; } end: release_all_trace_kprobes(); /* * Wait for the optimizer work to finish. Otherwise it might fiddle * with probes in already freed __init text. */ wait_for_kprobe_optimizer(); if (warn) pr_cont("NG: Some tests are failed. Please check them.\n"); else pr_cont("OK\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu44781.42%642.86%
Marcin Nowakowski488.74%17.14%
Namhyung Kim315.65%17.14%
Yoshihiro Yunomae91.64%17.14%
Tom Zanussi40.73%17.14%
Srikar Dronamraju40.73%17.14%
Thomas Gleixner40.73%17.14%
Arnd Bergmann10.18%17.14%
Steven Rostedt10.18%17.14%
Total549100.00%14100.00%

late_initcall(kprobe_trace_self_tests_init); #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu420658.22%4836.64%
Namhyung Kim120316.65%75.34%
Srikar Dronamraju82811.46%43.05%
Steven Rostedt2453.39%2015.27%
Alban Crequy1121.55%10.76%
Oleg Nesterov1021.41%32.29%
Marcin Nowakowski971.34%21.53%
Lai Jiangshan710.98%43.05%
Naveen N. Rao470.65%32.29%
Martin KaFai Lau430.60%10.76%
Alexei Starovoitov370.51%43.05%
Xiao Guangrong290.40%21.53%
Frédéric Weisbecker260.36%43.05%
Mathieu Desnoyers230.32%10.76%
Peter Zijlstra220.30%53.82%
Tom Zanussi210.29%21.53%
Jiri Olsa190.26%21.53%
Arnd Bergmann120.17%10.76%
Joe Perches120.17%10.76%
Rasmus Villemoes110.15%21.53%
Li Zefan100.14%21.53%
Yonghong Song100.14%10.76%
Yoshihiro Yunomae90.12%10.76%
David S. Miller80.11%10.76%
Andrey Vagin40.06%10.76%
Thomas Gleixner40.06%10.76%
Stephen Rothwell30.04%10.76%
Ingo Molnar30.04%10.76%
Wenji Huang20.03%10.76%
Sabrina Dubroca20.03%10.76%
Heiko Carstens10.01%10.76%
Josef Bacik10.01%10.76%
Daniel Walter10.01%10.76%
Total7224100.00%131100.00%
Directory: kernel/trace
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.