diff options
author | Ingo Molnar <mingo@kernel.org> | 2017-05-03 19:28:27 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-05-03 19:28:27 +0200 |
commit | 12c1c2fd780a9a5581105fcb6f251466cf35af2a (patch) | |
tree | ce613b7dfdb64d93a26765cdcf20b0f5deab9ef7 /kernel | |
parent | 33b88e708e7dfa58dc896da2a98f5719d2eb315c (diff) | |
parent | 4341ec6b3db4c3e903d6c44958722918baec1e59 (diff) | |
download | op-kernel-dev-12c1c2fd780a9a5581105fcb6f251466cf35af2a.zip op-kernel-dev-12c1c2fd780a9a5581105fcb6f251466cf35af2a.tar.gz |
Merge tag 'perf-core-for-mingo-4.12-20170503' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
Fixes:
- Support setting probes in versioned user space symbols, such as
pthread_create@@GLIBC_2.1, picking the default one, more work
needed to make it possible to set it on the other versions, as
the 'perf probe' syntax already uses @ for other purposes.
(Paul Clarke)
- Do not special case address zero as an error for routines that
return addresses (symbol lookup), instead use the return as the
success/error indication and pass a pointer to return the address,
fixing 'perf test vmlinux' (the one that compares address between
vmlinux and kallsyms) on s/390, where the '_text' address is equal
to zero (Arnaldo Carvalho de Melo)
Infrastructure changes:
- More header sanitization, moving stuff out of util.h into
more appropriate headers and objects and sometimes creating
new ones (Arnaldo Carvalho de Melo)
- Refactor a duplicated code for obtaining config file name (Taeung Song)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/events/core.c | 139 | ||||
-rw-r--r-- | kernel/events/ring_buffer.c | 34 | ||||
-rw-r--r-- | kernel/fork.c | 2 | ||||
-rw-r--r-- | kernel/kprobes.c | 46 | ||||
-rw-r--r-- | kernel/nsproxy.c | 3 | ||||
-rw-r--r-- | kernel/trace/Kconfig | 2 | ||||
-rw-r--r-- | kernel/trace/trace.c | 1 | ||||
-rw-r--r-- | kernel/trace/trace_kprobe.c | 9 |
8 files changed, 208 insertions, 28 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index ff01cba..6e75a5c 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -48,6 +48,8 @@ #include <linux/parser.h> #include <linux/sched/clock.h> #include <linux/sched/mm.h> +#include <linux/proc_ns.h> +#include <linux/mount.h> #include "internal.h" @@ -379,6 +381,7 @@ static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events); static atomic_t nr_mmap_events __read_mostly; static atomic_t nr_comm_events __read_mostly; +static atomic_t nr_namespaces_events __read_mostly; static atomic_t nr_task_events __read_mostly; static atomic_t nr_freq_events __read_mostly; static atomic_t nr_switch_events __read_mostly; @@ -3991,6 +3994,8 @@ static void unaccount_event(struct perf_event *event) atomic_dec(&nr_mmap_events); if (event->attr.comm) atomic_dec(&nr_comm_events); + if (event->attr.namespaces) + atomic_dec(&nr_namespaces_events); if (event->attr.task) atomic_dec(&nr_task_events); if (event->attr.freq) @@ -6491,6 +6496,7 @@ static void perf_event_task(struct task_struct *task, void perf_event_fork(struct task_struct *task) { perf_event_task(task, NULL, 1); + perf_event_namespaces(task); } /* @@ -6593,6 +6599,132 @@ void perf_event_comm(struct task_struct *task, bool exec) } /* + * namespaces tracking + */ + +struct perf_namespaces_event { + struct task_struct *task; + + struct { + struct perf_event_header header; + + u32 pid; + u32 tid; + u64 nr_namespaces; + struct perf_ns_link_info link_info[NR_NAMESPACES]; + } event_id; +}; + +static int perf_event_namespaces_match(struct perf_event *event) +{ + return event->attr.namespaces; +} + +static void perf_event_namespaces_output(struct perf_event *event, + void *data) +{ + struct perf_namespaces_event *namespaces_event = data; + struct perf_output_handle handle; + struct perf_sample_data sample; + int ret; + + if (!perf_event_namespaces_match(event)) + return; + + perf_event_header__init_id(&namespaces_event->event_id.header, + &sample, event); + ret = perf_output_begin(&handle, event, + namespaces_event->event_id.header.size); + if (ret) + return; + + namespaces_event->event_id.pid = perf_event_pid(event, + namespaces_event->task); + namespaces_event->event_id.tid = perf_event_tid(event, + namespaces_event->task); + + perf_output_put(&handle, namespaces_event->event_id); + + perf_event__output_id_sample(event, &handle, &sample); + + perf_output_end(&handle); +} + +static void perf_fill_ns_link_info(struct perf_ns_link_info *ns_link_info, + struct task_struct *task, + const struct proc_ns_operations *ns_ops) +{ + struct path ns_path; + struct inode *ns_inode; + void *error; + + error = ns_get_path(&ns_path, task, ns_ops); + if (!error) { + ns_inode = ns_path.dentry->d_inode; + ns_link_info->dev = new_encode_dev(ns_inode->i_sb->s_dev); + ns_link_info->ino = ns_inode->i_ino; + } +} + +void perf_event_namespaces(struct task_struct *task) +{ + struct perf_namespaces_event namespaces_event; + struct perf_ns_link_info *ns_link_info; + + if (!atomic_read(&nr_namespaces_events)) + return; + + namespaces_event = (struct perf_namespaces_event){ + .task = task, + .event_id = { + .header = { + .type = PERF_RECORD_NAMESPACES, + .misc = 0, + .size = sizeof(namespaces_event.event_id), + }, + /* .pid */ + /* .tid */ + .nr_namespaces = NR_NAMESPACES, + /* .link_info[NR_NAMESPACES] */ + }, + }; + + ns_link_info = namespaces_event.event_id.link_info; + + perf_fill_ns_link_info(&ns_link_info[MNT_NS_INDEX], + task, &mntns_operations); + +#ifdef CONFIG_USER_NS + perf_fill_ns_link_info(&ns_link_info[USER_NS_INDEX], + task, &userns_operations); +#endif +#ifdef CONFIG_NET_NS + perf_fill_ns_link_info(&ns_link_info[NET_NS_INDEX], + task, &netns_operations); +#endif +#ifdef CONFIG_UTS_NS + perf_fill_ns_link_info(&ns_link_info[UTS_NS_INDEX], + task, &utsns_operations); +#endif +#ifdef CONFIG_IPC_NS + perf_fill_ns_link_info(&ns_link_info[IPC_NS_INDEX], + task, &ipcns_operations); +#endif +#ifdef CONFIG_PID_NS + perf_fill_ns_link_info(&ns_link_info[PID_NS_INDEX], + task, &pidns_operations); +#endif +#ifdef CONFIG_CGROUPS + perf_fill_ns_link_info(&ns_link_info[CGROUP_NS_INDEX], + task, &cgroupns_operations); +#endif + + perf_iterate_sb(perf_event_namespaces_output, + &namespaces_event, + NULL); +} + +/* * mmap tracking */ @@ -9146,6 +9278,8 @@ static void account_event(struct perf_event *event) atomic_inc(&nr_mmap_events); if (event->attr.comm) atomic_inc(&nr_comm_events); + if (event->attr.namespaces) + atomic_inc(&nr_namespaces_events); if (event->attr.task) atomic_inc(&nr_task_events); if (event->attr.freq) @@ -9691,6 +9825,11 @@ SYSCALL_DEFINE5(perf_event_open, return -EACCES; } + if (attr.namespaces) { + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + } + if (attr.freq) { if (attr.sample_freq > sysctl_perf_event_sample_rate) return -EINVAL; diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 257fa46..2831480 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -297,6 +297,19 @@ ring_buffer_init(struct ring_buffer *rb, long watermark, int flags) rb->paused = 1; } +void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags) +{ + /* + * OVERWRITE is determined by perf_aux_output_end() and can't + * be passed in directly. + */ + if (WARN_ON_ONCE(flags & PERF_AUX_FLAG_OVERWRITE)) + return; + + handle->aux_flags |= flags; +} +EXPORT_SYMBOL_GPL(perf_aux_output_flag); + /* * This is called before hardware starts writing to the AUX area to * obtain an output handle and make sure there's room in the buffer. @@ -360,6 +373,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle, handle->event = event; handle->head = aux_head; handle->size = 0; + handle->aux_flags = 0; /* * In overwrite mode, AUX data stores do not depend on aux_tail, @@ -408,34 +422,32 @@ err: * of the AUX buffer management code is that after pmu::stop(), the AUX * transaction must be stopped and therefore drop the AUX reference count. */ -void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size, - bool truncated) +void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) { + bool wakeup = !!(handle->aux_flags & PERF_AUX_FLAG_TRUNCATED); struct ring_buffer *rb = handle->rb; - bool wakeup = truncated; unsigned long aux_head; - u64 flags = 0; - - if (truncated) - flags |= PERF_AUX_FLAG_TRUNCATED; /* in overwrite mode, driver provides aux_head via handle */ if (rb->aux_overwrite) { - flags |= PERF_AUX_FLAG_OVERWRITE; + handle->aux_flags |= PERF_AUX_FLAG_OVERWRITE; aux_head = handle->head; local_set(&rb->aux_head, aux_head); } else { + handle->aux_flags &= ~PERF_AUX_FLAG_OVERWRITE; + aux_head = local_read(&rb->aux_head); local_add(size, &rb->aux_head); } - if (size || flags) { + if (size || handle->aux_flags) { /* * Only send RECORD_AUX if we have something useful to communicate */ - perf_event_aux_event(handle->event, aux_head, size, flags); + perf_event_aux_event(handle->event, aux_head, size, + handle->aux_flags); } aux_head = rb->user_page->aux_head = local_read(&rb->aux_head); @@ -446,7 +458,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size, } if (wakeup) { - if (truncated) + if (handle->aux_flags & PERF_AUX_FLAG_TRUNCATED) handle->event->pending_disable = 1; perf_output_wakeup(handle); } diff --git a/kernel/fork.c b/kernel/fork.c index 6c463c80..afa2947 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2352,6 +2352,8 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) } } + perf_event_namespaces(current); + bad_unshare_cleanup_cred: if (new_cred) put_cred(new_cred); diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 699c5bc..d733479 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1391,21 +1391,19 @@ bool within_kprobe_blacklist(unsigned long addr) * This returns encoded errors if it fails to look up symbol or invalid * combination of parameters. */ -static kprobe_opcode_t *kprobe_addr(struct kprobe *p) +static kprobe_opcode_t *_kprobe_addr(kprobe_opcode_t *addr, + const char *symbol_name, unsigned int offset) { - kprobe_opcode_t *addr = p->addr; - - if ((p->symbol_name && p->addr) || - (!p->symbol_name && !p->addr)) + if ((symbol_name && addr) || (!symbol_name && !addr)) goto invalid; - if (p->symbol_name) { - kprobe_lookup_name(p->symbol_name, addr); + if (symbol_name) { + kprobe_lookup_name(symbol_name, addr); if (!addr) return ERR_PTR(-ENOENT); } - addr = (kprobe_opcode_t *)(((char *)addr) + p->offset); + addr = (kprobe_opcode_t *)(((char *)addr) + offset); if (addr) return addr; @@ -1413,6 +1411,11 @@ invalid: return ERR_PTR(-EINVAL); } +static kprobe_opcode_t *kprobe_addr(struct kprobe *p) +{ + return _kprobe_addr(p->addr, p->symbol_name, p->offset); +} + /* Check passed kprobe is valid and return kprobe in kprobe_table. */ static struct kprobe *__get_valid_kprobe(struct kprobe *p) { @@ -1740,11 +1743,12 @@ void unregister_kprobes(struct kprobe **kps, int num) } EXPORT_SYMBOL_GPL(unregister_kprobes); -int __weak __kprobes kprobe_exceptions_notify(struct notifier_block *self, - unsigned long val, void *data) +int __weak kprobe_exceptions_notify(struct notifier_block *self, + unsigned long val, void *data) { return NOTIFY_DONE; } +NOKPROBE_SYMBOL(kprobe_exceptions_notify); static struct notifier_block kprobe_exceptions_nb = { .notifier_call = kprobe_exceptions_notify, @@ -1875,6 +1879,25 @@ static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) } NOKPROBE_SYMBOL(pre_handler_kretprobe); +bool __weak arch_function_offset_within_entry(unsigned long offset) +{ + return !offset; +} + +bool function_offset_within_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset) +{ + kprobe_opcode_t *kp_addr = _kprobe_addr(addr, sym, offset); + + if (IS_ERR(kp_addr)) + return false; + + if (!kallsyms_lookup_size_offset((unsigned long)kp_addr, NULL, &offset) || + !arch_function_offset_within_entry(offset)) + return false; + + return true; +} + int register_kretprobe(struct kretprobe *rp) { int ret = 0; @@ -1882,6 +1905,9 @@ int register_kretprobe(struct kretprobe *rp) int i; void *addr; + if (!function_offset_within_entry(rp->kp.addr, rp->kp.symbol_name, rp->kp.offset)) + return -EINVAL; + if (kretprobe_blacklist_size) { addr = kprobe_addr(&rp->kp); if (IS_ERR(addr)) diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index 782102e..f6c5d33 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -26,6 +26,7 @@ #include <linux/file.h> #include <linux/syscalls.h> #include <linux/cgroup.h> +#include <linux/perf_event.h> static struct kmem_cache *nsproxy_cachep; @@ -262,6 +263,8 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype) goto out; } switch_task_namespaces(tsk, new_nsproxy); + + perf_event_namespaces(tsk); out: fput(file); return err; diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index d4a06e7..9619b57 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -455,7 +455,7 @@ config UPROBE_EVENTS select UPROBES select PROBE_EVENTS select TRACING - default n + default y help This allows the user to add tracing events on top of userspace dynamic events (similar to tracepoints) on the fly via the trace diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 0ad75e9..b253d59 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4355,6 +4355,7 @@ static const char readme_msg[] = "\t -:[<group>/]<event>\n" #ifdef CONFIG_KPROBE_EVENTS "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" + "place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr>\n" #endif #ifdef CONFIG_UPROBE_EVENTS "\t place: <path>:<offset>\n" diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 5f688cc..013f4e7 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -681,10 +681,6 @@ static int create_trace_kprobe(int argc, char **argv) return -EINVAL; } if (isdigit(argv[1][0])) { - if (is_return) { - pr_info("Return probe point must be a symbol.\n"); - return -EINVAL; - } /* an address specified */ ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); if (ret) { @@ -700,8 +696,9 @@ static int create_trace_kprobe(int argc, char **argv) pr_info("Failed to parse symbol.\n"); return ret; } - if (offset && is_return) { - pr_info("Return probe must be used without offset.\n"); + if (offset && is_return && + !function_offset_within_entry(NULL, symbol, offset)) { + pr_info("Given offset is not valid for return probe.\n"); return -EINVAL; } } |