| /* |
| * linux/fs/proc/base.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * proc base directory handling functions |
| * |
| * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. |
| * Instead of using magical inumbers to determine the kind of object |
| * we allocate and fill in-core inodes upon lookup. They don't even |
| * go into icache. We cache the reference to task_struct upon lookup too. |
| * Eventually it should become a filesystem in its own. We don't use the |
| * rest of procfs anymore. |
| * |
| * |
| * Changelog: |
| * 17-Jan-2005 |
| * Allan Bezerra |
| * Bruna Moreira <bruna.moreira@indt.org.br> |
| * Edjard Mota <edjard.mota@indt.org.br> |
| * Ilias Biris <ilias.biris@indt.org.br> |
| * Mauricio Lin <mauricio.lin@indt.org.br> |
| * |
| * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT |
| * |
| * A new process specific entry (smaps) included in /proc. It shows the |
| * size of rss for each memory area. The maps entry lacks information |
| * about physical memory size (rss) for each mapped file, i.e., |
| * rss information for executables and library files. |
| * This additional information is useful for any tools that need to know |
| * about physical memory consumption for a process specific library. |
| * |
| * Changelog: |
| * 21-Feb-2005 |
| * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT |
| * Pud inclusion in the page table walking. |
| * |
| * ChangeLog: |
| * 10-Mar-2005 |
| * 10LE Instituto Nokia de Tecnologia - INdT: |
| * A better way to walks through the page table as suggested by Hugh Dickins. |
| * |
| * Simo Piiroinen <simo.piiroinen@nokia.com>: |
| * Smaps information related to shared, private, clean and dirty pages. |
| * |
| * Paul Mundt <paul.mundt@nokia.com>: |
| * Overall revision about smaps. |
| */ |
| |
| #include <asm/uaccess.h> |
| |
| #include <linux/errno.h> |
| #include <linux/time.h> |
| #include <linux/proc_fs.h> |
| #include <linux/stat.h> |
| #include <linux/task_io_accounting_ops.h> |
| #include <linux/init.h> |
| #include <linux/capability.h> |
| #include <linux/file.h> |
| #include <linux/fdtable.h> |
| #include <linux/string.h> |
| #include <linux/seq_file.h> |
| #include <linux/namei.h> |
| #include <linux/mnt_namespace.h> |
| #include <linux/mm.h> |
| #include <linux/rcupdate.h> |
| #include <linux/kallsyms.h> |
| #include <linux/resource.h> |
| #include <linux/module.h> |
| #include <linux/mount.h> |
| #include <linux/security.h> |
| #include <linux/ptrace.h> |
| #include <linux/tracehook.h> |
| #include <linux/cgroup.h> |
| #include <linux/cpuset.h> |
| #include <linux/audit.h> |
| #include <linux/poll.h> |
| #include <linux/nsproxy.h> |
| #include <linux/oom.h> |
| #include <linux/elf.h> |
| #include <linux/pid_namespace.h> |
| #include "internal.h" |
| |
| /* NOTE: |
| * Implementing inode permission operations in /proc is almost |
| * certainly an error. Permission checks need to happen during |
| * each system call not at open time. The reason is that most of |
| * what we wish to check for permissions in /proc varies at runtime. |
| * |
| * The classic example of a problem is opening file descriptors |
| * in /proc for a task before it execs a suid executable. |
| */ |
| |
| struct pid_entry { |
| char *name; |
| int len; |
| mode_t mode; |
| const struct inode_operations *iop; |
| const struct file_operations *fop; |
| union proc_op op; |
| }; |
| |
| #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
| .name = (NAME), \ |
| .len = sizeof(NAME) - 1, \ |
| .mode = MODE, \ |
| .iop = IOP, \ |
| .fop = FOP, \ |
| .op = OP, \ |
| } |
| |
| #define DIR(NAME, MODE, OTYPE) \ |
| NOD(NAME, (S_IFDIR|(MODE)), \ |
| &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
| {} ) |
| #define LNK(NAME, OTYPE) \ |
| NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
| &proc_pid_link_inode_operations, NULL, \ |
| { .proc_get_link = &proc_##OTYPE##_link } ) |
| #define REG(NAME, MODE, OTYPE) \ |
| NOD(NAME, (S_IFREG|(MODE)), NULL, \ |
| &proc_##OTYPE##_operations, {}) |
| #define INF(NAME, MODE, OTYPE) \ |
| NOD(NAME, (S_IFREG|(MODE)), \ |
| NULL, &proc_info_file_operations, \ |
| { .proc_read = &proc_##OTYPE } ) |
| #define ONE(NAME, MODE, OTYPE) \ |
| NOD(NAME, (S_IFREG|(MODE)), \ |
| NULL, &proc_single_file_operations, \ |
| { .proc_show = &proc_##OTYPE } ) |
| |
| /* |
| * Count the number of hardlinks for the pid_entry table, excluding the . |
| * and .. links. |
| */ |
| static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, |
| unsigned int n) |
| { |
| unsigned int i; |
| unsigned int count; |
| |
| count = 0; |
| for (i = 0; i < n; ++i) { |
| if (S_ISDIR(entries[i].mode)) |
| ++count; |
| } |
| |
| return count; |
| } |
| |
| int maps_protect; |
| EXPORT_SYMBOL(maps_protect); |
| |
| static struct fs_struct *get_fs_struct(struct task_struct *task) |
| { |
| struct fs_struct *fs; |
| task_lock(task); |
| fs = task->fs; |
| if(fs) |
| atomic_inc(&fs->count); |
| task_unlock(task); |
| return fs; |
| } |
| |
| static int get_nr_threads(struct task_struct *tsk) |
| { |
| unsigned long flags; |
| int count = 0; |
| |
| if (lock_task_sighand(tsk, &flags)) { |
| count = atomic_read(&tsk->signal->count); |
| unlock_task_sighand(tsk, &flags); |
| } |
| return count; |
| } |
| |
| static int proc_cwd_link(struct inode *inode, struct path *path) |
| { |
| struct task_struct *task = get_proc_task(inode); |
| struct fs_struct *fs = NULL; |
| int result = -ENOENT; |
| |
| if (task) { |
| fs = get_fs_struct(task); |
| put_task_struct(task); |
| } |
| if (fs) { |
| read_lock(&fs->lock); |
| *path = fs->pwd; |
| path_get(&fs->pwd); |
| read_unlock(&fs->lock); |
| result = 0; |
| put_fs_struct(fs); |
| } |
| return result; |
| } |
| |
| static int proc_root_link(struct inode *inode, struct path *path) |
| { |
| struct task_struct *task = get_proc_task(inode); |
| struct fs_struct *fs = NULL; |
| int result = -ENOENT; |
| |
| if (task) { |
| fs = get_fs_struct(task); |
| put_task_struct(task); |
| } |
| if (fs) { |
| read_lock(&fs->lock); |
| *path = fs->root; |
| path_get(&fs->root); |
| read_unlock(&fs->lock); |
| result = 0; |
| put_fs_struct(fs); |
| } |
| return result; |
| } |
| |
| /* |
| * Return zero if current may access user memory in @task, -error if not. |
| */ |
| static int check_mem_permission(struct task_struct *task) |
| { |
| /* |
| * A task can always look at itself, in case it chooses |
| * to use system calls instead of load instructions. |
| */ |
| if (task == current) |
| return 0; |
| |
| /* |
| * If current is actively ptrace'ing, and would also be |
| * permitted to freshly attach with ptrace now, permit it. |
| */ |
| if (task_is_stopped_or_traced(task)) { |
| int match; |
| rcu_read_lock(); |
| match = (tracehook_tracer_task(task) == current); |
| rcu_read_unlock(); |
| if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) |
| return 0; |
| } |
| |
| /* |
| * Noone else is allowed. |
| */ |
| return -EPERM; |
| } |
| |
| struct mm_struct *mm_for_maps(struct task_struct *task) |
| { |
| struct mm_struct *mm = get_task_mm(task); |
| if (!mm) |
| return NULL; |
| down_read(&mm->mmap_sem); |
| task_lock(task); |
| if (task->mm != mm) |
| goto out; |
| if (task->mm != current->mm && |
| __ptrace_may_access(task, PTRACE_MODE_READ) < 0) |
| goto out; |
| task_unlock(task); |
| return mm; |
| out: |
| task_unlock(task); |
| up_read(&mm->mmap_sem); |
| mmput(mm); |
| return NULL; |
| } |
| |
| static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
| { |
| int res = 0; |
| unsigned int len; |
| struct mm_struct *mm = get_task_mm(task); |
| if (!mm) |
| goto out; |
| if (!mm->arg_end) |
| goto out_mm; /* Shh! No looking before we're done */ |
| |
| len = mm->arg_end - mm->arg_start; |
| |
| if (len > PAGE_SIZE) |
| len = PAGE_SIZE; |
| |
| res = access_process_vm(task, mm->arg_start, buffer, len, 0); |
| |
| // If the nul at the end of args has been overwritten, then |
| // assume application is using setproctitle(3). |
| if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { |
| len = strnlen(buffer, res); |
| if (len < res) { |
| res = len; |
| } else { |
| len = mm->env_end - mm->env_start; |
| if (len > PAGE_SIZE - res) |
| len = PAGE_SIZE - res; |
| res += access_process_vm(task, mm->env_start, buffer+res, len, 0); |
| res = strnlen(buffer, res); |
| } |
| } |
| out_mm: |
| mmput(mm); |
| out: |
| return res; |
| } |
| |
| static int proc_pid_auxv(struct task_struct *task, char *buffer) |
| { |
| int res = 0; |
| struct mm_struct *mm = get_task_mm(task); |
| if (mm) { |
| unsigned int nwords = 0; |
| do |
| nwords += 2; |
| while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
| res = nwords * sizeof(mm->saved_auxv[0]); |
| if (res > PAGE_SIZE) |
| res = PAGE_SIZE; |
| memcpy(buffer, mm->saved_auxv, res); |
| mmput(mm); |
| } |
| return res; |
| } |
| |
| |
| #ifdef CONFIG_KALLSYMS |
| /* |
| * Provides a wchan file via kallsyms in a proper one-value-per-file format. |
| * Returns the resolved symbol. If that fails, simply return the address. |
| */ |
| static int proc_pid_wchan(struct task_struct *task, char *buffer) |
| { |
| unsigned long wchan; |
| char symname[KSYM_NAME_LEN]; |
| |
| wchan = get_wchan(task); |
| |
| if (lookup_symbol_name(wchan, symname) < 0) |
| return sprintf(buffer, "%lu", wchan); |
| else |
| return sprintf(buffer, "%s", symname); |
| } |
| #endif /* CONFIG_KALLSYMS */ |
| |
| #ifdef CONFIG_SCHEDSTATS |
| /* |
| * Provides /proc/PID/schedstat |
| */ |
| static int proc_pid_schedstat(struct task_struct *task, char *buffer) |
| { |
| return sprintf(buffer, "%llu %llu %lu\n", |
| task->sched_info.cpu_time, |
| task->sched_info.run_delay, |
| task->sched_info.pcount); |
| } |
| #endif |
| |
| #ifdef CONFIG_LATENCYTOP |
| static int lstats_show_proc(struct seq_file *m, void *v) |
| { |
| int i; |
| struct inode *inode = m->private; |
| struct task_struct *task = get_proc_task(inode); |
| |
| if (!task) |
| return -ESRCH; |
| seq_puts(m, "Latency Top version : v0.1\n"); |
| for (i = 0; i < 32; i++) { |
| if (task->latency_record[i].backtrace[0]) { |
| int q; |
| seq_printf(m, "%i %li %li ", |
| task->latency_record[i].count, |
| task->latency_record[i].time, |
| task->latency_record[i].max); |
| for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
| char sym[KSYM_NAME_LEN]; |
| char *c; |
| if (!task->latency_record[i].backtrace[q]) |
| break; |
| if (task->latency_record[i].backtrace[q] == ULONG_MAX) |
| break; |
| sprint_symbol(sym, task->latency_record[i].backtrace[q]); |
| c = strchr(sym, '+'); |
| if (c) |
| *c = 0; |
| seq_printf(m, "%s ", sym); |
| } |
| seq_printf(m, "\n"); |
| } |
| |
| } |
| put_task_struct(task); |
| return 0; |
| } |
| |
| static int lstats_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, lstats_show_proc, inode); |
| } |
| |
| static ssize_t lstats_write(struct file *file, const char __user *buf, |
| size_t count, loff_t *offs) |
| { |
| struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| |
| if (!task) |
| return -ESRCH; |
| clear_all_latency_tracing(task); |
| put_task_struct(task); |
| |
| return count; |
| } |
| |
| static const struct file_operations proc_lstats_operations = { |
| .open = lstats_open, |
| .read = seq_read, |
| .write = lstats_write, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| #endif |
| |
| /* The badness from the OOM killer */ |
| unsigned long badness(struct task_struct *p, unsigned long uptime); |
| static int proc_oom_score(struct task_struct *task, char *buffer) |
| { |
| unsigned long points; |
| struct timespec uptime; |
| |
| do_posix_clock_monotonic_gettime(&uptime); |
| read_lock(&tasklist_lock); |
| points = badness(task, uptime.tv_sec); |
| read_unlock(&tasklist_lock); |
| return sprintf(buffer, "%lu\n", points); |
| } |
| |
| struct limit_names { |
| char *name; |
| char *unit; |
| }; |
| |
| static const struct limit_names lnames[RLIM_NLIMITS] = { |
| [RLIMIT_CPU] = {"Max cpu time", "ms"}, |
| [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
| [RLIMIT_DATA] = {"Max data size", "bytes"}, |
| [RLIMIT_STACK] = {"Max stack size", "bytes"}, |
| [RLIMIT_CORE] = {"Max core file size", "bytes"}, |
| [RLIMIT_RSS] = {"Max resident set", "bytes"}, |
| [RLIMIT_NPROC] = {"Max processes", "processes"}, |
| [RLIMIT_NOFILE] = {"Max open files", "files"}, |
| [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, |
| [RLIMIT_AS] = {"Max address space", "bytes"}, |
| [RLIMIT_LOCKS] = {"Max file locks", "locks"}, |
| [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, |
| [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, |
| [RLIMIT_NICE] = {"Max nice priority", NULL}, |
| [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, |
| [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
| }; |
| |
| /* Display limits for a process */ |
| static int proc_pid_limits(struct task_struct *task, char *buffer) |
| { |
| unsigned int i; |
| int count = 0; |
| unsigned long flags; |
| char *bufptr = buffer; |
| |
| struct rlimit rlim[RLIM_NLIMITS]; |
| |
| if (!lock_task_sighand(task, &flags)) |
| return 0; |
| memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
| unlock_task_sighand(task, &flags); |
| |
| /* |
| * print the file header |
| */ |
| count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", |
| "Limit", "Soft Limit", "Hard Limit", "Units"); |
| |
| for (i = 0; i < RLIM_NLIMITS; i++) { |
| if (rlim[i].rlim_cur == RLIM_INFINITY) |
| count += sprintf(&bufptr[count], "%-25s %-20s ", |
| lnames[i].name, "unlimited"); |
| else |
| count += sprintf(&bufptr[count], "%-25s %-20lu ", |
| lnames[i].name, rlim[i].rlim_cur); |
| |
| if (rlim[i].rlim_max == RLIM_INFINITY) |
| count += sprintf(&bufptr[count], "%-20s ", "unlimited"); |
| else |
| count += sprintf(&bufptr[count], "%-20lu ", |
| rlim[i].rlim_max); |
| |
| if (lnames[i].unit) |
| count += sprintf(&bufptr[count], "%-10s\n", |
| lnames[i].unit); |
| else |
| count += sprintf(&bufptr[count], "\n"); |
| } |
| |
| return count; |
| } |
| |
| #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| static int proc_pid_syscall(struct task_struct *task, char *buffer) |
| { |
| long nr; |
| unsigned long args[6], sp, pc; |
| |
| if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) |
| return sprintf(buffer, "running\n"); |
| |
| if (nr < 0) |
| return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
| |
| return sprintf(buffer, |
| "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
| nr, |
| args[0], args[1], args[2], args[3], args[4], args[5], |
| sp, pc); |
| } |
| #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ |
| |
| /************************************************************************/ |
| /* Here the fs part begins */ |
| /************************************************************************/ |
| |
| /* permission checks */ |
| static int proc_fd_access_allowed(struct inode *inode) |
| { |
| struct task_struct *task; |
| int allowed = 0; |
| /* Allow access to a task's file descriptors if it is us or we |
| * may use ptrace attach to the process and find out that |
| * information. |
| */ |
| task = get_proc_task(inode); |
| if (task) { |
| allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
| put_task_struct(task); |
| } |
| return allowed; |
| } |
| |
| static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
| { |
| int error; |
| struct inode *inode = dentry->d_inode; |
| |
| if (attr->ia_valid & ATTR_MODE) |
| return -EPERM; |
| |
| error = inode_change_ok(inode, attr); |
| if (!error) |
| error = inode_setattr(inode, attr); |
| return error; |
| } |
| |
| static const struct inode_operations proc_def_inode_operations = { |
| .setattr = proc_setattr, |
| }; |
| |
| static int mounts_open_common(struct inode *inode, struct file *file, |
| const struct seq_operations *op) |
| { |
| struct task_struct *task = get_proc_task(inode); |
| struct nsproxy *nsp; |
| struct mnt_namespace *ns = NULL; |
| struct fs_struct *fs = NULL; |
| struct path root; |
| struct proc_mounts *p; |
| int ret = -EINVAL; |
| |
| if (task) { |
| rcu_read_lock(); |
| nsp = task_nsproxy(task); |
| if (nsp) { |
| ns = nsp->mnt_ns; |
| if (ns) |
| get_mnt_ns(ns); |
| } |
| rcu_read_unlock(); |
| if (ns) |
| fs = get_fs_struct(task); |
| put_task_struct(task); |
| } |
| |
| if (!ns) |
| goto err; |
| if (!fs) |
| goto err_put_ns; |
| |
| read_lock(&fs->lock); |
| root = fs->root; |
| path_get(&root); |
| read_unlock(&fs->lock); |
| put_fs_struct(fs); |
| |
| ret = -ENOMEM; |
| p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); |
| if (!p) |
| goto err_put_path; |
| |
| file->private_data = &p->m; |
| ret = seq_open(file, op); |
| if (ret) |
| goto err_free; |
| |
| p->m.private = p; |
| p->ns = ns; |
| p->root = root; |
| p->event = ns->event; |
| |
| return 0; |
| |
| err_free: |
| kfree(p); |
| err_put_path: |
| path_put(&root); |
| err_put_ns: |
| put_mnt_ns(ns); |
| err: |
| return ret; |
| } |
| |
| static int mounts_release(struct inode *inode, struct file *file) |
| { |
| struct proc_mounts *p = file->private_data; |
| path_put(&p->root); |
| put_mnt_ns(p->ns); |
| return seq_release(inode, file); |
| } |
| |
| static unsigned mounts_poll(struct file *file, poll_table *wait) |
| { |
| struct proc_mounts *p = file->private_data; |
| struct mnt_namespace *ns = p->ns; |
| unsigned res = 0; |
| |
| poll_wait(file, &ns->poll, wait); |
| |
| spin_lock(&vfsmount_lock); |
| if (p->event != ns->event) { |
| p->event = ns->event; |
| res = POLLERR; |
| } |
| spin_unlock(&vfsmount_lock); |
| |
| return res; |
| } |
| |
| static int mounts_open(struct inode *inode, struct file *file) |
| { |
| return mounts_open_common(inode, file, &mounts_op); |
| } |
| |
| static const struct file_operations proc_mounts_operations = { |
| .open = mounts_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = mounts_release, |
| .poll = mounts_poll, |
| }; |
| |
| static int mountinfo_open(struct inode *inode, struct file *file) |
| { |
| return mounts_open_common(inode, file, &mountinfo_op); |
| } |
| |
| static const struct file_operations proc_mountinfo_operations = { |
| .open = mountinfo_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = mounts_release, |
| .poll = mounts_poll, |
| }; |
| |
| static int mountstats_open(struct inode *inode, struct file *file) |
| { |
| return mounts_open_common(inode, file, &mountstats_op); |
| } |
| |
| static const struct file_operations proc_mountstats_operations = { |
| .open = mountstats_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = mounts_release, |
| }; |
| |
| #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
| |
| static ssize_t proc_info_read(struct file * file, char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_path.dentry->d_inode; |
| unsigned long page; |
| ssize_t length; |
| struct task_struct *task = get_proc_task(inode); |
| |
| length = -ESRCH; |
| if (!task) |
| goto out_no_task; |
| |
| if (count > PROC_BLOCK_SIZE) |
| count = PROC_BLOCK_SIZE; |
| |
| length = -ENOMEM; |
| if (!(page = __get_free_page(GFP_TEMPORARY))) |
| goto out; |
| |
| length = PROC_I(inode)->op.proc_read(task, (char*)page); |
| |
| if (length >= 0) |
| length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); |
| free_page(page); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return length; |
| } |
| |
| static const struct file_operations proc_info_file_operations = { |
| .read = proc_info_read, |
| }; |
| |
| static int proc_single_show(struct seq_file *m, void *v) |
| { |
| struct inode *inode = m->private; |
| struct pid_namespace *ns; |
| struct pid *pid; |
| struct task_struct *task; |
| int ret; |
| |
| ns = inode->i_sb->s_fs_info; |
| pid = proc_pid(inode); |
| task = get_pid_task(pid, PIDTYPE_PID); |
| if (!task) |
| return -ESRCH; |
| |
| ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); |
| |
| put_task_struct(task); |
| return ret; |
| } |
| |
| static int proc_single_open(struct inode *inode, struct file *filp) |
| { |
| int ret; |
| ret = single_open(filp, proc_single_show, NULL); |
| if (!ret) { |
| struct seq_file *m = filp->private_data; |
| |
| m->private = inode; |
| } |
| return ret; |
| } |
| |
| static const struct file_operations proc_single_file_operations = { |
| .open = proc_single_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int mem_open(struct inode* inode, struct file* file) |
| { |
| file->private_data = (void*)((long)current->self_exec_id); |
| return 0; |
| } |
| |
| static ssize_t mem_read(struct file * file, char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| char *page; |
| unsigned long src = *ppos; |
| int ret = -ESRCH; |
| struct mm_struct *mm; |
| |
| if (!task) |
| goto out_no_task; |
| |
| if (check_mem_permission(task)) |
| goto out; |
| |
| ret = -ENOMEM; |
| page = (char *)__get_free_page(GFP_TEMPORARY); |
| if (!page) |
| goto out; |
| |
| ret = 0; |
| |
| mm = get_task_mm(task); |
| if (!mm) |
| goto out_free; |
| |
| ret = -EIO; |
| |
| if (file->private_data != (void*)((long)current->self_exec_id)) |
| goto out_put; |
| |
| ret = 0; |
| |
| while (count > 0) { |
| int this_len, retval; |
| |
| this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| retval = access_process_vm(task, src, page, this_len, 0); |
| if (!retval || check_mem_permission(task)) { |
| if (!ret) |
| ret = -EIO; |
| break; |
| } |
| |
| if (copy_to_user(buf, page, retval)) { |
| ret = -EFAULT; |
| break; |
| } |
| |
| ret += retval; |
| src += retval; |
| buf += retval; |
| count -= retval; |
| } |
| *ppos = src; |
| |
| out_put: |
| mmput(mm); |
| out_free: |
| free_page((unsigned long) page); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return ret; |
| } |
| |
| #define mem_write NULL |
| |
| #ifndef mem_write |
| /* This is a security hazard */ |
| static ssize_t mem_write(struct file * file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| int copied; |
| char *page; |
| struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| unsigned long dst = *ppos; |
| |
| copied = -ESRCH; |
| if (!task) |
| goto out_no_task; |
| |
| if (check_mem_permission(task)) |
| goto out; |
| |
| copied = -ENOMEM; |
| page = (char *)__get_free_page(GFP_TEMPORARY); |
| if (!page) |
| goto out; |
| |
| copied = 0; |
| while (count > 0) { |
| int this_len, retval; |
| |
| this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| if (copy_from_user(page, buf, this_len)) { |
| copied = -EFAULT; |
| break; |
| } |
| retval = access_process_vm(task, dst, page, this_len, 1); |
| if (!retval) { |
| if (!copied) |
| copied = -EIO; |
| break; |
| } |
| copied += retval; |
| buf += retval; |
| dst += retval; |
| count -= retval; |
| } |
| *ppos = dst; |
| free_page((unsigned long) page); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return copied; |
| } |
| #endif |
| |
| loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
| { |
| switch (orig) { |
| case 0: |
| file->f_pos = offset; |
| break; |
| case 1: |
| file->f_pos += offset; |
| break; |
| default: |
| return -EINVAL; |
| } |
| force_successful_syscall_return(); |
| return file->f_pos; |
| } |
| |
| static const struct file_operations proc_mem_operations = { |
| .llseek = mem_lseek, |
| .read = mem_read, |
| .write = mem_write, |
| .open = mem_open, |
| }; |
| |
| static ssize_t environ_read(struct file *file, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| char *page; |
| unsigned long src = *ppos; |
| int ret = -ESRCH; |
| struct mm_struct *mm; |
| |
| if (!task) |
| goto out_no_task; |
| |
| if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
| goto out; |
| |
| ret = -ENOMEM; |
| page = (char *)__get_free_page(GFP_TEMPORARY); |
| if (!page) |
| goto out; |
| |
| ret = 0; |
| |
| mm = get_task_mm(task); |
| if (!mm) |
| goto out_free; |
| |
| while (count > 0) { |
| int this_len, retval, max_len; |
| |
| this_len = mm->env_end - (mm->env_start + src); |
| |
| if (this_len <= 0) |
| break; |
| |
| max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| this_len = (this_len > max_len) ? max_len : this_len; |
| |
| retval = access_process_vm(task, (mm->env_start + src), |
| page, this_len, 0); |
| |
| if (retval <= 0) { |
| ret = retval; |
| break; |
| } |
| |
| if (copy_to_user(buf, page, retval)) { |
| ret = -EFAULT; |
| break; |
| } |
| |
| ret += retval; |
| src += retval; |
| buf += retval; |
| count -= retval; |
| } |
| *ppos = src; |
| |
| mmput(mm); |
| out_free: |
| free_page((unsigned long) page); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return ret; |
| } |
| |
| static const struct file_operations proc_environ_operations = { |
| .read = environ_read, |
| }; |
| |
| static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| char buffer[PROC_NUMBUF]; |
| size_t len; |
| int oom_adjust; |
| |
| if (!task) |
| return -ESRCH; |
| oom_adjust = task->oomkilladj; |
| put_task_struct(task); |
| |
| len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
| |
| return simple_read_from_buffer(buf, count, ppos, buffer, len); |
| } |
| |
| static ssize_t oom_adjust_write(struct file *file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *task; |
| char buffer[PROC_NUMBUF], *end; |
| int oom_adjust; |
| |
| memset(buffer, 0, sizeof(buffer)); |
| if (count > sizeof(buffer) - 1) |
| count = sizeof(buffer) - 1; |
| if (copy_from_user(buffer, buf, count)) |
| return -EFAULT; |
| oom_adjust = simple_strtol(buffer, &end, 0); |
| if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
| oom_adjust != OOM_DISABLE) |
| return -EINVAL; |
| if (*end == '\n') |
| end++; |
| task = get_proc_task(file->f_path.dentry->d_inode); |
| if (!task) |
| return -ESRCH; |
| if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
| put_task_struct(task); |
| return -EACCES; |
| } |
| task->oomkilladj = oom_adjust; |
| put_task_struct(task); |
| if (end - buffer == 0) |
| return -EIO; |
| return end - buffer; |
| } |
| |
| static const struct file_operations proc_oom_adjust_operations = { |
| .read = oom_adjust_read, |
| .write = oom_adjust_write, |
| }; |
| |
| #ifdef CONFIG_AUDITSYSCALL |
| #define TMPBUFLEN 21 |
| static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_path.dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| ssize_t length; |
| char tmpbuf[TMPBUFLEN]; |
| |
| if (!task) |
| return -ESRCH; |
| length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| audit_get_loginuid(task)); |
| put_task_struct(task); |
| return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| } |
| |
| static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_path.dentry->d_inode; |
| char *page, *tmp; |
| ssize_t length; |
| uid_t loginuid; |
| |
| if (!capable(CAP_AUDIT_CONTROL)) |
| return -EPERM; |
| |
| if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
| return -EPERM; |
| |
| if (count >= PAGE_SIZE) |
| count = PAGE_SIZE - 1; |
| |
| if (*ppos != 0) { |
| /* No partial writes. */ |
| return -EINVAL; |
| } |
| page = (char*)__get_free_page(GFP_TEMPORARY); |
| if (!page) |
| return -ENOMEM; |
| length = -EFAULT; |
| if (copy_from_user(page, buf, count)) |
| goto out_free_page; |
| |
| page[count] = '\0'; |
| loginuid = simple_strtoul(page, &tmp, 10); |
| if (tmp == page) { |
| length = -EINVAL; |
| goto out_free_page; |
| |
| } |
| length = audit_set_loginuid(current, loginuid); |
| if (likely(length == 0)) |
| length = count; |
| |
| out_free_page: |
| free_page((unsigned long) page); |
| return length; |
| } |
| |
| static const struct file_operations proc_loginuid_operations = { |
| .read = proc_loginuid_read, |
| .write = proc_loginuid_write, |
| }; |
| |
| static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_path.dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| ssize_t length; |
| char tmpbuf[TMPBUFLEN]; |
| |
| if (!task) |
| return -ESRCH; |
| length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| audit_get_sessionid(task)); |
| put_task_struct(task); |
| return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| } |
| |
| static const struct file_operations proc_sessionid_operations = { |
| .read = proc_sessionid_read, |
| }; |
| #endif |
| |
| #ifdef CONFIG_FAULT_INJECTION |
| static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| char buffer[PROC_NUMBUF]; |
| size_t len; |
| int make_it_fail; |
| |
| if (!task) |
| return -ESRCH; |
| make_it_fail = task->make_it_fail; |
| put_task_struct(task); |
| |
| len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
| |
| return simple_read_from_buffer(buf, count, ppos, buffer, len); |
| } |
| |
| static ssize_t proc_fault_inject_write(struct file * file, |
| const char __user * buf, size_t count, loff_t *ppos) |
| { |
| struct task_struct *task; |
| char buffer[PROC_NUMBUF], *end; |
| int make_it_fail; |
| |
| if (!capable(CAP_SYS_RESOURCE)) |
| return -EPERM; |
| memset(buffer, 0, sizeof(buffer)); |
| if (count > sizeof(buffer) - 1) |
| count = sizeof(buffer) - 1; |
| if (copy_from_user(buffer, buf, count)) |
| return -EFAULT; |
| make_it_fail = simple_strtol(buffer, &end, 0); |
| if (*end == '\n') |
| end++; |
| task = get_proc_task(file->f_dentry->d_inode); |
| if (!task) |
| return -ESRCH; |
| task->make_it_fail = make_it_fail; |
| put_task_struct(task); |
| if (end - buffer == 0) |
| return -EIO; |
| return end - buffer; |
| } |
| |
| static const struct file_operations proc_fault_inject_operations = { |
| .read = proc_fault_inject_read, |
| .write = proc_fault_inject_write, |
| }; |
| #endif |
| |
| |
| #ifdef CONFIG_SCHED_DEBUG |
| /* |
| * Print out various scheduling related per-task fields: |
| */ |
| static int sched_show(struct seq_file *m, void *v) |
| { |
| struct inode *inode = m->private; |
| struct task_struct *p; |
| |
| WARN_ON(!inode); |
| |
| p = get_proc_task(inode); |
| if (!p) |
| return -ESRCH; |
| proc_sched_show_task(p, m); |
| |
| put_task_struct(p); |
| |
| return 0; |
| } |
| |
| static ssize_t |
| sched_write(struct file *file, const char __user *buf, |
| size_t count, loff_t *offset) |
| { |
| struct inode *inode = file->f_path.dentry->d_inode; |
| struct task_struct *p; |
| |
| WARN_ON(!inode); |
| |
| p = get_proc_task(inode); |
| if (!p) |
| return -ESRCH; |
| proc_sched_set_task(p); |
| |
| put_task_struct(p); |
| |
| return count; |
| } |
| |
| static int sched_open(struct inode *inode, struct file *filp) |
| { |
| int ret; |
| |
| ret = single_open(filp, sched_show, NULL); |
| if (!ret) { |
| struct seq_file *m = filp->private_data; |
| |
| m->private = inode; |
| } |
| return ret; |
| } |
| |
| static const struct file_operations proc_pid_sched_operations = { |
| .open = sched_open, |
| .read = seq_read, |
| .write = sched_write, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| #endif |
| |
| /* |
| * We added or removed a vma mapping the executable. The vmas are only mapped |
| * during exec and are not mapped with the mmap system call. |
| * Callers must hold down_write() on the mm's mmap_sem for these |
| */ |
| void added_exe_file_vma(struct mm_struct *mm) |
| { |
| mm->num_exe_file_vmas++; |
| } |
| |
| void removed_exe_file_vma(struct mm_struct *mm) |
| { |
| mm->num_exe_file_vmas--; |
| if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ |
| fput(mm->exe_file); |
| mm->exe_file = NULL; |
| } |
| |
| } |
| |
| void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) |
| { |
| if (new_exe_file) |
| get_file(new_exe_file); |
| if (mm->exe_file) |
| fput(mm->exe_file); |
| mm->exe_file = new_exe_file; |
| mm->num_exe_file_vmas = 0; |
| } |
| |
| struct file *get_mm_exe_file(struct mm_struct *mm) |
| { |
| struct file *exe_file; |
| |
| /* We need mmap_sem to protect against races with removal of |
| * VM_EXECUTABLE vmas */ |
| down_read(&mm->mmap_sem); |
| exe_file = mm->exe_file; |
| if (exe_file) |
| get_file(exe_file); |
| up_read(&mm->mmap_sem); |
| return exe_file; |
| } |
| |
| void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) |
| { |
| /* It's safe to write the exe_file pointer without exe_file_lock because |
| * this is called during fork when the task is not yet in /proc */ |
| newmm->exe_file = get_mm_exe_file(oldmm); |
| } |
| |
| static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| { |
| struct task_struct *task; |
| struct mm_struct *mm; |
| struct file *exe_file; |
| |
| task = get_proc_task(inode); |
| if (!task) |
| return -ENOENT; |
| mm = get_task_mm(task); |
| put_task_struct(task); |
| if (!mm) |
| return -ENOENT; |
| exe_file = get_mm_exe_file(mm); |
| mmput(mm); |
| if (exe_file) { |
| *exe_path = exe_file->f_path; |
| path_get(&exe_file->f_path); |
| fput(exe_file); |
| return 0; |
| } else |
| return -ENOENT; |
| } |
| |
| static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct inode *inode = dentry->d_inode; |
| int error = -EACCES; |
| |
| /* We don't need a base pointer in the /proc filesystem */ |
| path_put(&nd->path); |
| |
| /* Are we allowed to snoop on the tasks file descriptors? */ |
| if (!proc_fd_access_allowed(inode)) |
| goto out; |
| |
| error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
| nd->last_type = LAST_BIND; |
| out: |
| return ERR_PTR(error); |
| } |
| |
| static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
| { |
| char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
| char *pathname; |
| int len; |
| |
| if (!tmp) |
| return -ENOMEM; |
| |
| pathname = d_path(path, tmp, PAGE_SIZE); |
| len = PTR_ERR(pathname); |
| if (IS_ERR(pathname)) |
| goto out; |
| len = tmp + PAGE_SIZE - 1 - pathname; |
| |
| if (len > buflen) |
| len = buflen; |
| if (copy_to_user(buffer, pathname, len)) |
| len = -EFAULT; |
| out: |
| free_page((unsigned long)tmp); |
| return len; |
| } |
| |
| static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| { |
| int error = -EACCES; |
| struct inode *inode = dentry->d_inode; |
| struct path path; |
| |
| /* Are we allowed to snoop on the tasks file descriptors? */ |
| if (!proc_fd_access_allowed(inode)) |
| goto out; |
| |
| error = PROC_I(inode)->op.proc_get_link(inode, &path); |
| if (error) |
| goto out; |
| |
| error = do_proc_readlink(&path, buffer, buflen); |
| path_put(&path); |
| out: |
| return error; |
| } |
| |
| static const struct inode_operations proc_pid_link_inode_operations = { |
| .readlink = proc_pid_readlink, |
| .follow_link = proc_pid_follow_link, |
| .setattr = proc_setattr, |
| }; |
| |
| |
| /* building an inode */ |
| |
| static int task_dumpable(struct task_struct *task) |
| { |
| int dumpable = 0; |
| struct mm_struct *mm; |
| |
| task_lock(task); |
| mm = task->mm; |
| if (mm) |
| dumpable = get_dumpable(mm); |
| task_unlock(task); |
| if(dumpable == 1) |
| return 1; |
| return 0; |
| } |
| |
| |
| static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
| { |
| struct inode * inode; |
| struct proc_inode *ei; |
| |
| /* We need a new inode */ |
| |
| inode = new_inode(sb); |
| if (!inode) |
| goto out; |
| |
| /* Common stuff */ |
| ei = PROC_I(inode); |
| inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| inode->i_op = &proc_def_inode_operations; |
| |
| /* |
| * grab the reference to task. |
| */ |
| ei->pid = get_task_pid(task, PIDTYPE_PID); |
| if (!ei->pid) |
| goto out_unlock; |
| |
| inode->i_uid = 0; |
| inode->i_gid = 0; |
| if (task_dumpable(task)) { |
| inode->i_uid = task->euid; |
| inode->i_gid = task->egid; |
| } |
| security_task_to_inode(task, inode); |
| |
| out: |
| return inode; |
| |
| out_unlock: |
| iput(inode); |
| return NULL; |
| } |
| |
| static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *task; |
| generic_fillattr(inode, stat); |
| |
| rcu_read_lock(); |
| stat->uid = 0; |
| stat->gid = 0; |
| task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| if (task) { |
| if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| task_dumpable(task)) { |
| stat->uid = task->euid; |
| stat->gid = task->egid; |
| } |
| } |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| /* dentry stuff */ |
| |
| /* |
| * Exceptional case: normally we are not allowed to unhash a busy |
| * directory. In this case, however, we can do it - no aliasing problems |
| * due to the way we treat inodes. |
| * |
| * Rewrite the inode's ownerships here because the owning task may have |
| * performed a setuid(), etc. |
| * |
| * Before the /proc/pid/status file was created the only way to read |
| * the effective uid of a /process was to stat /proc/pid. Reading |
| * /proc/pid/status is slow enough that procps and other packages |
| * kept stating /proc/pid. To keep the rules in /proc simple I have |
| * made this apply to all per process world readable and executable |
| * directories. |
| */ |
| static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| if (task) { |
| if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| task_dumpable(task)) { |
| inode->i_uid = task->euid; |
| inode->i_gid = task->egid; |
| } else { |
| inode->i_uid = 0; |
| inode->i_gid = 0; |
| } |
| inode->i_mode &= ~(S_ISUID | S_ISGID); |
| security_task_to_inode(task, inode); |
| put_task_struct(task); |
| return 1; |
| } |
| d_drop(dentry); |
| return 0; |
| } |
| |
| static int pid_delete_dentry(struct dentry * dentry) |
| { |
| /* Is the task we represent dead? |
| * If so, then don't put the dentry on the lru list, |
| * kill it immediately. |
| */ |
| return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| } |
| |
| static struct dentry_operations pid_dentry_operations = |
| { |
| .d_revalidate = pid_revalidate, |
| .d_delete = pid_delete_dentry, |
| }; |
| |
| /* Lookups */ |
| |
| typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
| struct task_struct *, const void *); |
| |
| /* |
| * Fill a directory entry. |
| * |
| * If possible create the dcache entry and derive our inode number and |
| * file type from dcache entry. |
| * |
| * Since all of the proc inode numbers are dynamically generated, the inode |
| * numbers do not exist until the inode is cache. This means creating the |
| * the dcache entry in readdir is necessary to keep the inode numbers |
| * reported by readdir in sync with the inode numbers reported |
| * by stat. |
| */ |
| static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| char *name, int len, |
| instantiate_t instantiate, struct task_struct *task, const void *ptr) |
| { |
| struct dentry *child, *dir = filp->f_path.dentry; |
| struct inode *inode; |
| struct qstr qname; |
| ino_t ino = 0; |
| unsigned type = DT_UNKNOWN; |
| |
| qname.name = name; |
| qname.len = len; |
| qname.hash = full_name_hash(name, len); |
| |
| child = d_lookup(dir, &qname); |
| if (!child) { |
| struct dentry *new; |
| new = d_alloc(dir, &qname); |
| if (new) { |
| child = instantiate(dir->d_inode, new, task, ptr); |
| if (child) |
| dput(new); |
| else |
| child = new; |
| } |
| } |
| if (!child || IS_ERR(child) || !child->d_inode) |
| goto end_instantiate; |
| inode = child->d_inode; |
| if (inode) { |
| ino = inode->i_ino; |
| type = inode->i_mode >> 12; |
| } |
| dput(child); |
| end_instantiate: |
| if (!ino) |
| ino = find_inode_number(dir, &qname); |
| if (!ino) |
| ino = 1; |
| return filldir(dirent, name, len, filp->f_pos, ino, type); |
| } |
| |
| static unsigned name_to_int(struct dentry *dentry) |
| { |
| const char *name = dentry->d_name.name; |
| int len = dentry->d_name.len; |
| unsigned n = 0; |
| |
| if (len > 1 && *name == '0') |
| goto out; |
| while (len-- > 0) { |
| unsigned c = *name++ - '0'; |
| if (c > 9) |
| goto out; |
| if (n >= (~0U-9)/10) |
| goto out; |
| n *= 10; |
| n += c; |
| } |
| return n; |
| out: |
| return ~0U; |
| } |
| |
| #define PROC_FDINFO_MAX 64 |
| |
| static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
| { |
| struct task_struct *task = get_proc_task(inode); |
| struct files_struct *files = NULL; |
| struct file *file; |
| int fd = proc_fd(inode); |
| |
| if (task) { |
| files = get_files_struct(task); |
| put_task_struct(task); |
| } |
| if (files) { |
| /* |
| * We are not taking a ref to the file structure, so we must |
| * hold ->file_lock. |
| */ |
| spin_lock(&files->file_lock); |
| file = fcheck_files(files, fd); |
| if (file) { |
| if (path) { |
| *path = file->f_path; |
| path_get(&file->f_path); |
| } |
| if (info) |
| snprintf(info, PROC_FDINFO_MAX, |
| "pos:\t%lli\n" |
| "flags:\t0%o\n", |
| (long long) file->f_pos, |
| file->f_flags); |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| return 0; |
| } |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| } |
| return -ENOENT; |
| } |
| |
| static int proc_fd_link(struct inode *inode, struct path *path) |
| { |
| return proc_fd_info(inode, path, NULL); |
| } |
| |
| static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| int fd = proc_fd(inode); |
| struct files_struct *files; |
| |
| if (task) { |
| files = get_files_struct(task); |
| if (files) { |
| rcu_read_lock(); |
| if (fcheck_files(files, fd)) { |
| rcu_read_unlock(); |
| put_files_struct(files); |
| if (task_dumpable(task)) { |
| inode->i_uid = task->euid; |
| inode->i_gid = task->egid; |
| } else { |
| inode->i_uid = 0; |
| inode->i_gid = 0; |
| } |
| inode->i_mode &= ~(S_ISUID | S_ISGID); |
| security_task_to_inode(task, inode); |
| put_task_struct(task); |
| return 1; |
| } |
| rcu_read_unlock(); |
| put_files_struct(files); |
| } |
| put_task_struct(task); |
| } |
| d_drop(dentry); |
| return 0; |
| } |
| |
| static struct dentry_operations tid_fd_dentry_operations = |
| { |
| .d_revalidate = tid_fd_revalidate, |
| .d_delete = pid_delete_dentry, |
| }; |
| |
| static struct dentry *proc_fd_instantiate(struct inode *dir, |
| struct dentry *dentry, struct task_struct *task, const void *ptr) |
| { |
| unsigned fd = *(const unsigned *)ptr; |
| struct file *file; |
| struct files_struct *files; |
| struct inode *inode; |
| struct proc_inode *ei; |
| struct dentry *error = ERR_PTR(-ENOENT); |
| |
| inode = proc_pid_make_inode(dir->i_sb, task); |
| if (!inode) |
| goto out; |
| ei = PROC_I(inode); |
| ei->fd = fd; |
| files = get_files_struct(task); |
| if (!files) |
| goto out_iput; |
| inode->i_mode = S_IFLNK; |
| |
| /* |
| * We are not taking a ref to the file structure, so we must |
| * hold ->file_lock. |
| */ |
| spin_lock(&files->file_lock); |
| file = fcheck_files(files, fd); |
| if (!file) |
| goto out_unlock; |
| if (file->f_mode & 1) |
| inode->i_mode |= S_IRUSR | S_IXUSR; |
| if (file->f_mode & 2) |
| inode->i_mode |= S_IWUSR | S_IXUSR; |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| |
| inode->i_op = &proc_pid_link_inode_operations; |
| inode->i_size = 64; |
| ei->op.proc_get_link = proc_fd_link; |
| dentry->d_op = &tid_fd_dentry_operations; |
| d_add(dentry, inode); |
| /* Close the race of the process dying before we return the dentry */ |
| if (tid_fd_revalidate(dentry, NULL)) |
| error = NULL; |
| |
| out: |
| return error; |
| out_unlock: |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| out_iput: |
| iput(inode); |
| goto out; |
| } |
| |
| static struct dentry *proc_lookupfd_common(struct inode *dir, |
| struct dentry *dentry, |
| instantiate_t instantiate) |
| { |
| struct task_struct *task = get_proc_task(dir); |
| unsigned fd = name_to_int(dentry); |
| struct dentry *result = ERR_PTR(-ENOENT); |
| |
| if (!task) |
| goto out_no_task; |
| if (fd == ~0U) |
| goto out; |
| |
| result = instantiate(dir, dentry, task, &fd); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return result; |
| } |
| |
| static int proc_readfd_common(struct file * filp, void * dirent, |
| filldir_t filldir, instantiate_t instantiate) |
| { |
| struct dentry *dentry = filp->f_path.dentry; |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *p = get_proc_task(inode); |
| unsigned int fd, ino; |
| int retval; |
| struct files_struct * files; |
| |
| retval = -ENOENT; |
| if (!p) |
| goto out_no_task; |
| retval = 0; |
| |
| fd = filp->f_pos; |
| switch (fd) { |
| case 0: |
| if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
| goto out; |
| filp->f_pos++; |
| case 1: |
| ino = parent_ino(dentry); |
| if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
| goto out; |
| filp->f_pos++; |
| default: |
| files = get_files_struct(p); |
| if (!files) |
| goto out; |
| rcu_read_lock(); |
| for (fd = filp->f_pos-2; |
| fd < files_fdtable(files)->max_fds; |
| fd++, filp->f_pos++) { |
| char name[PROC_NUMBUF]; |
| int len; |
| |
| if (!fcheck_files(files, fd)) |
| continue; |
| rcu_read_unlock(); |
| |
| len = snprintf(name, sizeof(name), "%d", fd); |
| if (proc_fill_cache(filp, dirent, filldir, |
| name, len, instantiate, |
| p, &fd) < 0) { |
| rcu_read_lock(); |
| break; |
| } |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| put_files_struct(files); |
| } |
| out: |
| put_task_struct(p); |
| out_no_task: |
| return retval; |
| } |
| |
| static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| struct nameidata *nd) |
| { |
| return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| } |
| |
| static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| { |
| return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| } |
| |
| static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| size_t len, loff_t *ppos) |
| { |
| char tmp[PROC_FDINFO_MAX]; |
| int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
| if (!err) |
| err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| return err; |
| } |
| |
| static const struct file_operations proc_fdinfo_file_operations = { |
| .open = nonseekable_open, |
| .read = proc_fdinfo_read, |
| }; |
| |
| static const struct file_operations proc_fd_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_readfd, |
| }; |
| |
| /* |
| * /proc/pid/fd needs a special permission handler so that a process can still |
| * access /proc/self/fd after it has executed a setuid(). |
| */ |
| static int proc_fd_permission(struct inode *inode, int mask) |
| { |
| int rv; |
| |
| rv = generic_permission(inode, mask, NULL); |
| if (rv == 0) |
| return 0; |
| if (task_pid(current) == proc_pid(inode)) |
| rv = 0; |
| return rv; |
| } |
| |
| /* |
| * proc directories can do almost nothing.. |
| */ |
| static const struct inode_operations proc_fd_inode_operations = { |
| .lookup = proc_lookupfd, |
| .permission = proc_fd_permission, |
| .setattr = proc_setattr, |
| }; |
| |
| static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| struct dentry *dentry, struct task_struct *task, const void *ptr) |
| { |
| unsigned fd = *(unsigned *)ptr; |
| struct inode *inode; |
| struct proc_inode *ei; |
| struct dentry *error = ERR_PTR(-ENOENT); |
| |
| inode = proc_pid_make_inode(dir->i_sb, task); |
| if (!inode) |
| goto out; |
| ei = PROC_I(inode); |
| ei->fd = fd; |
| inode->i_mode = S_IFREG | S_IRUSR; |
| inode->i_fop = &proc_fdinfo_file_operations; |
| dentry->d_op = &tid_fd_dentry_operations; |
| d_add(dentry, inode); |
| /* Close the race of the process dying before we return the dentry */ |
| if (tid_fd_revalidate(dentry, NULL)) |
| error = NULL; |
| |
| out: |
| return error; |
| } |
| |
| static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| struct dentry *dentry, |
| struct nameidata *nd) |
| { |
| return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| } |
| |
| static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| { |
| return proc_readfd_common(filp, dirent, filldir, |
| proc_fdinfo_instantiate); |
| } |
| |
| static const struct file_operations proc_fdinfo_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_readfdinfo, |
| }; |
| |
| /* |
| * proc directories can do almost nothing.. |
| */ |
| static const struct inode_operations proc_fdinfo_inode_operations = { |
| .lookup = proc_lookupfdinfo, |
| .setattr = proc_setattr, |
| }; |
| |
| |
| static struct dentry *proc_pident_instantiate(struct inode *dir, |
| struct dentry *dentry, struct task_struct *task, const void *ptr) |
| { |
| const struct pid_entry *p = ptr; |
| struct inode *inode; |
| struct proc_inode *ei; |
| struct dentry *error = ERR_PTR(-EINVAL); |
| |
| inode = proc_pid_make_inode(dir->i_sb, task); |
| if (!inode) |
| goto out; |
| |
| ei = PROC_I(inode); |
| inode->i_mode = p->mode; |
| if (S_ISDIR(inode->i_mode)) |
| inode->i_nlink = 2; /* Use getattr to fix if necessary */ |
| if (p->iop) |
| inode->i_op = p->iop; |
| if (p->fop) |
| inode->i_fop = p->fop; |
| ei->op = p->op; |
| dentry->d_op = &pid_dentry_operations; |
| d_add(dentry, inode); |
| /* Close the race of the process dying before we return the dentry */ |
| if (pid_revalidate(dentry, NULL)) |
| error = NULL; |
| out: |
| return error; |
| } |
| |
| static struct dentry *proc_pident_lookup(struct inode *dir, |
| struct dentry *dentry, |
| const struct pid_entry *ents, |
| unsigned int nents) |
| { |
| struct inode *inode; |
| struct dentry *error; |
| struct task_struct *task = get_proc_task(dir); |
| const struct pid_entry *p, *last; |
| |
| error = ERR_PTR(-ENOENT); |
| inode = NULL; |
| |
| if (!task) |
| goto out_no_task; |
| |
| /* |
| * Yes, it does not scale. And it should not. Don't add |
| * new entries into /proc/<tgid>/ without very good reasons. |
| */ |
| last = &ents[nents - 1]; |
| for (p = ents; p <= last; p++) { |
| if (p->len != dentry->d_name.len) |
| continue; |
| if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| break; |
| } |
| if (p > last) |
| goto out; |
| |
| error = proc_pident_instantiate(dir, dentry, task, p); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return error; |
| } |
| |
| static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| filldir_t filldir, struct task_struct *task, const struct pid_entry *p) |
| { |
| return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| proc_pident_instantiate, task, p); |
| } |
| |
| static int proc_pident_readdir(struct file *filp, |
| void *dirent, filldir_t filldir, |
| const struct pid_entry *ents, unsigned int nents) |
| { |
| int i; |
| struct dentry *dentry = filp->f_path.dentry; |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| const struct pid_entry *p, *last; |
| ino_t ino; |
| int ret; |
| |
| ret = -ENOENT; |
| if (!task) |
| goto out_no_task; |
| |
| ret = 0; |
| i = filp->f_pos; |
| switch (i) { |
| case 0: |
| ino = inode->i_ino; |
| if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| goto out; |
| i++; |
| filp->f_pos++; |
| /* fall through */ |
| case 1: |
| ino = parent_ino(dentry); |
| if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| goto out; |
| i++; |
| filp->f_pos++; |
| /* fall through */ |
| default: |
| i -= 2; |
| if (i >= nents) { |
| ret = 1; |
| goto out; |
| } |
| p = ents + i; |
| last = &ents[nents - 1]; |
| while (p <= last) { |
| if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
| goto out; |
| filp->f_pos++; |
| p++; |
| } |
| } |
| |
| ret = 1; |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return ret; |
| } |
| |
| #ifdef CONFIG_SECURITY |
| static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_path.dentry->d_inode; |
| char *p = NULL; |
| ssize_t length; |
| struct task_struct *task = get_proc_task(inode); |
| |
| if (!task) |
| return -ESRCH; |
| |
| length = security_getprocattr(task, |
| (char*)file->f_path.dentry->d_name.name, |
| &p); |
| put_task_struct(task); |
| if (length > 0) |
| length = simple_read_from_buffer(buf, count, ppos, p, length); |
| kfree(p); |
| return length; |
| } |
| |
| static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_path.dentry->d_inode; |
| char *page; |
| ssize_t length; |
| struct task_struct *task = get_proc_task(inode); |
| |
| length = -ESRCH; |
| if (!task) |
| goto out_no_task; |
| if (count > PAGE_SIZE) |
| count = PAGE_SIZE; |
| |
| /* No partial writes. */ |
| length = -EINVAL; |
| if (*ppos != 0) |
| goto out; |
| |
| length = -ENOMEM; |
| page = (char*)__get_free_page(GFP_TEMPORARY); |
| if (!page) |
| goto out; |
| |
| length = -EFAULT; |
| if (copy_from_user(page, buf, count)) |
| goto out_free; |
| |
| length = security_setprocattr(task, |
| (char*)file->f_path.dentry->d_name.name, |
| (void*)page, count); |
| out_free: |
| free_page((unsigned long) page); |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return length; |
| } |
| |
| static const struct file_operations proc_pid_attr_operations = { |
| .read = proc_pid_attr_read, |
| .write = proc_pid_attr_write, |
| }; |
| |
| static const struct pid_entry attr_dir_stuff[] = { |
| REG("current", S_IRUGO|S_IWUGO, pid_attr), |
| REG("prev", S_IRUGO, pid_attr), |
| REG("exec", S_IRUGO|S_IWUGO, pid_attr), |
| REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), |
| REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), |
| REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), |
| }; |
| |
| static int proc_attr_dir_readdir(struct file * filp, |
| void * dirent, filldir_t filldir) |
| { |
| return proc_pident_readdir(filp,dirent,filldir, |
| attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
| } |
| |
| static const struct file_operations proc_attr_dir_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_attr_dir_readdir, |
| }; |
| |
| static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
| struct dentry *dentry, struct nameidata *nd) |
| { |
| return proc_pident_lookup(dir, dentry, |
| attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
| } |
| |
| static const struct inode_operations proc_attr_dir_inode_operations = { |
| .lookup = proc_attr_dir_lookup, |
| .getattr = pid_getattr, |
| .setattr = proc_setattr, |
| }; |
| |
| #endif |
| |
| #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| struct mm_struct *mm; |
| char buffer[PROC_NUMBUF]; |
| size_t len; |
| int ret; |
| |
| if (!task) |
| return -ESRCH; |
| |
| ret = 0; |
| mm = get_task_mm(task); |
| if (mm) { |
| len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| MMF_DUMP_FILTER_SHIFT)); |
| mmput(mm); |
| ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| } |
| |
| put_task_struct(task); |
| |
| return ret; |
| } |
| |
| static ssize_t proc_coredump_filter_write(struct file *file, |
| const char __user *buf, |
| size_t count, |
| loff_t *ppos) |
| { |
| struct task_struct *task; |
| struct mm_struct *mm; |
| char buffer[PROC_NUMBUF], *end; |
| unsigned int val; |
| int ret; |
| int i; |
| unsigned long mask; |
| |
| ret = -EFAULT; |
| memset(buffer, 0, sizeof(buffer)); |
| if (count > sizeof(buffer) - 1) |
| count = sizeof(buffer) - 1; |
| if (copy_from_user(buffer, buf, count)) |
| goto out_no_task; |
| |
| ret = -EINVAL; |
| val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| if (*end == '\n') |
| end++; |
| if (end - buffer == 0) |
| goto out_no_task; |
| |
| ret = -ESRCH; |
| task = get_proc_task(file->f_dentry->d_inode); |
| if (!task) |
| goto out_no_task; |
| |
| ret = end - buffer; |
| mm = get_task_mm(task); |
| if (!mm) |
| goto out_no_mm; |
| |
| for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| if (val & mask) |
| set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| else |
| clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| } |
| |
| mmput(mm); |
| out_no_mm: |
| put_task_struct(task); |
| out_no_task: |
| return ret; |
| } |
| |
| static const struct file_operations proc_coredump_filter_operations = { |
| .read = proc_coredump_filter_read, |
| .write = proc_coredump_filter_write, |
| }; |
| #endif |
| |
| /* |
| * /proc/self: |
| */ |
| static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| int buflen) |
| { |
| struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
| pid_t tgid = task_tgid_nr_ns(current, ns); |
| char tmp[PROC_NUMBUF]; |
| if (!tgid) |
| return -ENOENT; |
| sprintf(tmp, "%d", tgid); |
| return vfs_readlink(dentry,buffer,buflen,tmp); |
| } |
| |
| static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
| pid_t tgid = task_tgid_nr_ns(current, ns); |
| char tmp[PROC_NUMBUF]; |
| if (!tgid) |
| return ERR_PTR(-ENOENT); |
| sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
| return ERR_PTR(vfs_follow_link(nd,tmp)); |
| } |
| |
| static const struct inode_operations proc_self_inode_operations = { |
| .readlink = proc_self_readlink, |
| .follow_link = proc_self_follow_link, |
| }; |
| |
| /* |
| * proc base |
| * |
| * These are the directory entries in the root directory of /proc |
| * that properly belong to the /proc filesystem, as they describe |
| * describe something that is process related. |
| */ |
| static const struct pid_entry proc_base_stuff[] = { |
| NOD("self", S_IFLNK|S_IRWXUGO, |
| &proc_self_inode_operations, NULL, {}), |
| }; |
| |
| /* |
| * Exceptional case: normally we are not allowed to unhash a busy |
| * directory. In this case, however, we can do it - no aliasing problems |
| * due to the way we treat inodes. |
| */ |
| static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| if (task) { |
| put_task_struct(task); |
| return 1; |
| } |
| d_drop(dentry); |
| return 0; |
| } |
| |
| static struct dentry_operations proc_base_dentry_operations = |
| { |
| .d_revalidate = proc_base_revalidate, |
| .d_delete = pid_delete_dentry, |
| }; |
| |
| static struct dentry *proc_base_instantiate(struct inode *dir, |
| struct dentry *dentry, struct task_struct *task, const void *ptr) |
| { |
| const struct pid_entry *p = ptr; |
| struct inode *inode; |
| struct proc_inode *ei; |
| struct dentry *error = ERR_PTR(-EINVAL); |
| |
| /* Allocate the inode */ |
| error = ERR_PTR(-ENOMEM); |
| inode = new_inode(dir->i_sb); |
| if (!inode) |
| goto out; |
| |
| /* Initialize the inode */ |
| ei = PROC_I(inode); |
| inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| |
| /* |
| * grab the reference to the task. |
| */ |
| ei->pid = get_task_pid(task, PIDTYPE_PID); |
| if (!ei->pid) |
| goto out_iput; |
| |
| inode->i_uid = 0; |
| inode->i_gid = 0; |
| inode->i_mode = p->mode; |
| if (S_ISDIR(inode->i_mode)) |
| inode->i_nlink = 2; |
| if (S_ISLNK(inode->i_mode)) |
| inode->i_size = 64; |
| if (p->iop) |
| inode->i_op = p->iop; |
| if (p->fop) |
| inode->i_fop = p->fop; |
| ei->op = p->op; |
| dentry->d_op = &proc_base_dentry_operations; |
| d_add(dentry, inode); |
| error = NULL; |
| out: |
| return error; |
| out_iput: |
| iput(inode); |
| goto out; |
| } |
| |
| static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| { |
| struct dentry *error; |
| struct task_struct *task = get_proc_task(dir); |
| const struct pid_entry *p, *last; |
| |
| error = ERR_PTR(-ENOENT); |
| |
| if (!task) |
| goto out_no_task; |
| |
| /* Lookup the directory entry */ |
| last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| for (p = proc_base_stuff; p <= last; p++) { |
| if (p->len != dentry->d_name.len) |
| continue; |
| if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| break; |
| } |
| if (p > last) |
| goto out; |
| |
| error = proc_base_instantiate(dir, dentry, task, p); |
| |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return error; |
| } |
| |
| static int proc_base_fill_cache(struct file *filp, void *dirent, |
| filldir_t filldir, struct task_struct *task, const struct pid_entry *p) |
| { |
| return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| proc_base_instantiate, task, p); |
| } |
| |
| #ifdef CONFIG_TASK_IO_ACCOUNTING |
| static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
| { |
| struct task_io_accounting acct = task->ioac; |
| unsigned long flags; |
| |
| if (whole && lock_task_sighand(task, &flags)) { |
| struct task_struct *t = task; |
| |
| task_io_accounting_add(&acct, &task->signal->ioac); |
| while_each_thread(task, t) |
| task_io_accounting_add(&acct, &t->ioac); |
| |
| unlock_task_sighand(task, &flags); |
| } |
| return sprintf(buffer, |
| "rchar: %llu\n" |
| "wchar: %llu\n" |
| "syscr: %llu\n" |
| "syscw: %llu\n" |
| "read_bytes: %llu\n" |
| "write_bytes: %llu\n" |
| "cancelled_write_bytes: %llu\n", |
| (unsigned long long)acct.rchar, |
| (unsigned long long)acct.wchar, |
| (unsigned long long)acct.syscr, |
| (unsigned long long)acct.syscw, |
| (unsigned long long)acct.read_bytes, |
| (unsigned long long)acct.write_bytes, |
| (unsigned long long)acct.cancelled_write_bytes); |
| } |
| |
| static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| { |
| return do_io_accounting(task, buffer, 0); |
| } |
| |
| static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| { |
| return do_io_accounting(task, buffer, 1); |
| } |
| #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
| |
| static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| struct pid *pid, struct task_struct *task) |
| { |
| seq_printf(m, "%08x\n", task->personality); |
| return 0; |
| } |
| |
| /* |
| * Thread groups |
| */ |
| static const struct file_operations proc_task_operations; |
| static const struct inode_operations proc_task_inode_operations; |
| |
| static const struct pid_entry tgid_base_stuff[] = { |
| DIR("task", S_IRUGO|S_IXUGO, task), |
| DIR("fd", S_IRUSR|S_IXUSR, fd), |
| DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
| #ifdef CONFIG_NET |
| DIR("net", S_IRUGO|S_IXUGO, net), |
| #endif |
| REG("environ", S_IRUSR, environ), |
| INF("auxv", S_IRUSR, pid_auxv), |
| ONE("status", S_IRUGO, pid_status), |
| ONE("personality", S_IRUSR, pid_personality), |
| INF("limits", S_IRUSR, pid_limits), |
| #ifdef CONFIG_SCHED_DEBUG |
| REG("sched", S_IRUGO|S_IWUSR, pid_sched), |
| #endif |
| #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| INF("syscall", S_IRUSR, pid_syscall), |
| #endif |
| INF("cmdline", S_IRUGO, pid_cmdline), |
| ONE("stat", S_IRUGO, tgid_stat), |
| ONE("statm", S_IRUGO, pid_statm), |
| REG("maps", S_IRUGO, maps), |
| #ifdef CONFIG_NUMA |
| REG("numa_maps", S_IRUGO, numa_maps), |
| #endif |
| REG("mem", S_IRUSR|S_IWUSR, mem), |
| LNK("cwd", cwd), |
| LNK("root", root), |
| LNK("exe", exe), |
| REG("mounts", S_IRUGO, mounts), |
| REG("mountinfo", S_IRUGO, mountinfo), |
| REG("mountstats", S_IRUSR, mountstats), |
| #ifdef CONFIG_PROC_PAGE_MONITOR |
| REG("clear_refs", S_IWUSR, clear_refs), |
| REG("smaps", S_IRUGO, smaps), |
| REG("pagemap", S_IRUSR, pagemap), |
| #endif |
| #ifdef CONFIG_SECURITY |
| DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
| #endif |
| #ifdef CONFIG_KALLSYMS |
| INF("wchan", S_IRUGO, pid_wchan), |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| INF("schedstat", S_IRUGO, pid_schedstat), |
| #endif |
| #ifdef CONFIG_LATENCYTOP |
| REG("latency", S_IRUGO, lstats), |
| #endif |
| #ifdef CONFIG_PROC_PID_CPUSET |
| REG("cpuset", S_IRUGO, cpuset), |
| #endif |
| #ifdef CONFIG_CGROUPS |
| REG("cgroup", S_IRUGO, cgroup), |
| #endif |
| INF("oom_score", S_IRUGO, oom_score), |
| REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), |
| #ifdef CONFIG_AUDITSYSCALL |
| REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
| REG("sessionid", S_IRUGO, sessionid), |
| #endif |
| #ifdef CONFIG_FAULT_INJECTION |
| REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), |
| #endif |
| #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), |
| #endif |
| #ifdef CONFIG_TASK_IO_ACCOUNTING |
| INF("io", S_IRUGO, tgid_io_accounting), |
| #endif |
| }; |
| |
| static int proc_tgid_base_readdir(struct file * filp, |
| void * dirent, filldir_t filldir) |
| { |
| return proc_pident_readdir(filp,dirent,filldir, |
| tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| } |
| |
| static const struct file_operations proc_tgid_base_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_tgid_base_readdir, |
| }; |
| |
| static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
| return proc_pident_lookup(dir, dentry, |
| tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
| } |
| |
| static const struct inode_operations proc_tgid_base_inode_operations = { |
| .lookup = proc_tgid_base_lookup, |
| .getattr = pid_getattr, |
| .setattr = proc_setattr, |
| }; |
| |
| static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
| { |
| struct dentry *dentry, *leader, *dir; |
| char buf[PROC_NUMBUF]; |
| struct qstr name; |
| |
| name.name = buf; |
| name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
| if (dentry) { |
| if (!(current->flags & PF_EXITING)) |
| shrink_dcache_parent(dentry); |
| d_drop(dentry); |
| dput(dentry); |
| } |
| |
| if (tgid == 0) |
| goto out; |
| |
| name.name = buf; |
| name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| leader = d_hash_and_lookup(mnt->mnt_root, &name); |
| if (!leader) |
| goto out; |
| |
| name.name = "task"; |
| name.len = strlen(name.name); |
| dir = d_hash_and_lookup(leader, &name); |
| if (!dir) |
| goto out_put_leader; |
| |
| name.name = buf; |
| name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| dentry = d_hash_and_lookup(dir, &name); |
| if (dentry) { |
| shrink_dcache_parent(dentry); |
| d_drop(dentry); |
| dput(dentry); |
| } |
| |
| dput(dir); |
| out_put_leader: |
| dput(leader); |
| out: |
| return; |
| } |
| |
| /** |
| * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| * @task: task that should be flushed. |
| * |
| * When flushing dentries from proc, one needs to flush them from global |
| * proc (proc_mnt) and from all the namespaces' procs this task was seen |
| * in. This call is supposed to do all of this job. |
| * |
| * Looks in the dcache for |
| * /proc/@pid |
| * /proc/@tgid/task/@pid |
| * if either directory is present flushes it and all of it'ts children |
| * from the dcache. |
| * |
| * It is safe and reasonable to cache /proc entries for a task until |
| * that task exits. After that they just clog up the dcache with |
| * useless entries, possibly causing useful dcache entries to be |
| * flushed instead. This routine is proved to flush those useless |
| * dcache entries at process exit time. |
| * |
| * NOTE: This routine is just an optimization so it does not guarantee |
| * that no dcache entries will exist at process exit time it |
| * just makes it very unlikely that any will persist. |
| */ |
| |
| void proc_flush_task(struct task_struct *task) |
| { |
| int i; |
| struct pid *pid, *tgid = NULL; |
| struct upid *upid; |
| |
| pid = task_pid(task); |
| if (thread_group_leader(task)) |
| tgid = task_tgid(task); |
| |
| for (i = 0; i <= pid->level; i++) { |
| upid = &pid->numbers[i]; |
| proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
| tgid ? tgid->numbers[i].nr : 0); |
| } |
| |
| upid = &pid->numbers[pid->level]; |
| if (upid->nr == 1) |
| pid_ns_release_proc(upid->ns); |
| } |
| |
| static struct dentry *proc_pid_instantiate(struct inode *dir, |
| struct dentry * dentry, |
| struct task_struct *task, const void *ptr) |
| { |
| struct dentry *error = ERR_PTR(-ENOENT); |
| struct inode *inode; |
| |
| inode = proc_pid_make_inode(dir->i_sb, task); |
| if (!inode) |
| goto out; |
| |
| inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| inode->i_op = &proc_tgid_base_inode_operations; |
| inode->i_fop = &proc_tgid_base_operations; |
| inode->i_flags|=S_IMMUTABLE; |
| |
| inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, |
| ARRAY_SIZE(tgid_base_stuff)); |
| |
| dentry->d_op = &pid_dentry_operations; |
| |
| d_add(dentry, inode); |
| /* Close the race of the process dying before we return the dentry */ |
| if (pid_revalidate(dentry, NULL)) |
| error = NULL; |
| out: |
| return error; |
| } |
| |
| struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| { |
| struct dentry *result = ERR_PTR(-ENOENT); |
| struct task_struct *task; |
| unsigned tgid; |
| struct pid_namespace *ns; |
| |
| result = proc_base_lookup(dir, dentry); |
| if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| goto out; |
| |
| tgid = name_to_int(dentry); |
| if (tgid == ~0U) |
| goto out; |
| |
| ns = dentry->d_sb->s_fs_info; |
| rcu_read_lock(); |
| task = find_task_by_pid_ns(tgid, ns); |
| if (task) |
| get_task_struct(task); |
| rcu_read_unlock(); |
| if (!task) |
| goto out; |
| |
| result = proc_pid_instantiate(dir, dentry, task, NULL); |
| put_task_struct(task); |
| out: |
| return result; |
| } |
| |
| /* |
| * Find the first task with tgid >= tgid |
| * |
| */ |
| struct tgid_iter { |
| unsigned int tgid; |
| struct task_struct *task; |
| }; |
| static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| { |
| struct pid *pid; |
| |
| if (iter.task) |
| put_task_struct(iter.task); |
| rcu_read_lock(); |
| retry: |
| iter.task = NULL; |
| pid = find_ge_pid(iter.tgid, ns); |
| if (pid) { |
| iter.tgid = pid_nr_ns(pid, ns); |
| iter.task = pid_task(pid, PIDTYPE_PID); |
| /* What we to know is if the pid we have find is the |
| * pid of a thread_group_leader. Testing for task |
| * being a thread_group_leader is the obvious thing |
| * todo but there is a window when it fails, due to |
| * the pid transfer logic in de_thread. |
| * |
| * So we perform the straight forward test of seeing |
| * if the pid we have found is the pid of a thread |
| * group leader, and don't worry if the task we have |
| * found doesn't happen to be a thread group leader. |
| * As we don't care in the case of readdir. |
| */ |
| if (!iter.task || !has_group_leader_pid(iter.task)) { |
| iter.tgid += 1; |
| goto retry; |
| } |
| get_task_struct(iter.task); |
| } |
| rcu_read_unlock(); |
| return iter; |
| } |
| |
| #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
| |
| static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| struct tgid_iter iter) |
| { |
| char name[PROC_NUMBUF]; |
| int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
| return proc_fill_cache(filp, dirent, filldir, name, len, |
| proc_pid_instantiate, iter.task, NULL); |
| } |
| |
| /* for the /proc/ directory itself, after non-process stuff has been done */ |
| int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| { |
| unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
| struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
| struct tgid_iter iter; |
| struct pid_namespace *ns; |
| |
| if (!reaper) |
| goto out_no_task; |
| |
| for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
| const struct pid_entry *p = &proc_base_stuff[nr]; |
| if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
| goto out; |
| } |
| |
| ns = filp->f_dentry->d_sb->s_fs_info; |
| iter.task = NULL; |
| iter.tgid = filp->f_pos - TGID_OFFSET; |
| for (iter = next_tgid(ns, iter); |
| iter.task; |
| iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| filp->f_pos = iter.tgid + TGID_OFFSET; |
| if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| put_task_struct(iter.task); |
| goto out; |
| } |
| } |
| filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| out: |
| put_task_struct(reaper); |
| out_no_task: |
| return 0; |
| } |
| |
| /* |
| * Tasks |
| */ |
| static const struct pid_entry tid_base_stuff[] = { |
| DIR("fd", S_IRUSR|S_IXUSR, fd), |
| DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
| REG("environ", S_IRUSR, environ), |
| INF("auxv", S_IRUSR, pid_auxv), |
| ONE("status", S_IRUGO, pid_status), |
| ONE("personality", S_IRUSR, pid_personality), |
| INF("limits", S_IRUSR, pid_limits), |
| #ifdef CONFIG_SCHED_DEBUG |
| REG("sched", S_IRUGO|S_IWUSR, pid_sched), |
| #endif |
| #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| INF("syscall", S_IRUSR, pid_syscall), |
| #endif |
| INF("cmdline", S_IRUGO, pid_cmdline), |
| ONE("stat", S_IRUGO, tid_stat), |
| ONE("statm", S_IRUGO, pid_statm), |
| REG("maps", S_IRUGO, maps), |
| #ifdef CONFIG_NUMA |
| REG("numa_maps", S_IRUGO, numa_maps), |
| #endif |
| REG("mem", S_IRUSR|S_IWUSR, mem), |
| LNK("cwd", cwd), |
| LNK("root", root), |
| LNK("exe", exe), |
| REG("mounts", S_IRUGO, mounts), |
| REG("mountinfo", S_IRUGO, mountinfo), |
| #ifdef CONFIG_PROC_PAGE_MONITOR |
| REG("clear_refs", S_IWUSR, clear_refs), |
| REG("smaps", S_IRUGO, smaps), |
| REG("pagemap", S_IRUSR, pagemap), |
| #endif |
| #ifdef CONFIG_SECURITY |
| DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
| #endif |
| #ifdef CONFIG_KALLSYMS |
| INF("wchan", S_IRUGO, pid_wchan), |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| INF("schedstat", S_IRUGO, pid_schedstat), |
| #endif |
| #ifdef CONFIG_LATENCYTOP |
| REG("latency", S_IRUGO, lstats), |
| #endif |
| #ifdef CONFIG_PROC_PID_CPUSET |
| REG("cpuset", S_IRUGO, cpuset), |
| #endif |
| #ifdef CONFIG_CGROUPS |
| REG("cgroup", S_IRUGO, cgroup), |
| #endif |
| INF("oom_score", S_IRUGO, oom_score), |
| REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), |
| #ifdef CONFIG_AUDITSYSCALL |
| REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
| REG("sessionid", S_IRUSR, sessionid), |
| #endif |
| #ifdef CONFIG_FAULT_INJECTION |
| REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), |
| #endif |
| #ifdef CONFIG_TASK_IO_ACCOUNTING |
| INF("io", S_IRUGO, tid_io_accounting), |
| #endif |
| }; |
| |
| static int proc_tid_base_readdir(struct file * filp, |
| void * dirent, filldir_t filldir) |
| { |
| return proc_pident_readdir(filp,dirent,filldir, |
| tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| } |
| |
| static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
| return proc_pident_lookup(dir, dentry, |
| tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
| } |
| |
| static const struct file_operations proc_tid_base_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_tid_base_readdir, |
| }; |
| |
| static const struct inode_operations proc_tid_base_inode_operations = { |
| .lookup = proc_tid_base_lookup, |
| .getattr = pid_getattr, |
| .setattr = proc_setattr, |
| }; |
| |
| static struct dentry *proc_task_instantiate(struct inode *dir, |
| struct dentry *dentry, struct task_struct *task, const void *ptr) |
| { |
| struct dentry *error = ERR_PTR(-ENOENT); |
| struct inode *inode; |
| inode = proc_pid_make_inode(dir->i_sb, task); |
| |
| if (!inode) |
| goto out; |
| inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| inode->i_op = &proc_tid_base_inode_operations; |
| inode->i_fop = &proc_tid_base_operations; |
| inode->i_flags|=S_IMMUTABLE; |
| |
| inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, |
| ARRAY_SIZE(tid_base_stuff)); |
| |
| dentry->d_op = &pid_dentry_operations; |
| |
| d_add(dentry, inode); |
| /* Close the race of the process dying before we return the dentry */ |
| if (pid_revalidate(dentry, NULL)) |
| error = NULL; |
| out: |
| return error; |
| } |
| |
| static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| { |
| struct dentry *result = ERR_PTR(-ENOENT); |
| struct task_struct *task; |
| struct task_struct *leader = get_proc_task(dir); |
| unsigned tid; |
| struct pid_namespace *ns; |
| |
| if (!leader) |
| goto out_no_task; |
| |
| tid = name_to_int(dentry); |
| if (tid == ~0U) |
| goto out; |
| |
| ns = dentry->d_sb->s_fs_info; |
| rcu_read_lock(); |
| task = find_task_by_pid_ns(tid, ns); |
| if (task) |
| get_task_struct(task); |
| rcu_read_unlock(); |
| if (!task) |
| goto out; |
| if (!same_thread_group(leader, task)) |
| goto out_drop_task; |
| |
| result = proc_task_instantiate(dir, dentry, task, NULL); |
| out_drop_task: |
| put_task_struct(task); |
| out: |
| put_task_struct(leader); |
| out_no_task: |
| return result; |
| } |
| |
| /* |
| * Find the first tid of a thread group to return to user space. |
| * |
| * Usually this is just the thread group leader, but if the users |
| * buffer was too small or there was a seek into the middle of the |
| * directory we have more work todo. |
| * |
| * In the case of a short read we start with find_task_by_pid. |
| * |
| * In the case of a seek we start with the leader and walk nr |
| * threads past it. |
| */ |
| static struct task_struct *first_tid(struct task_struct *leader, |
| int tid, int nr, struct pid_namespace *ns) |
| { |
| struct task_struct *pos; |
| |
| rcu_read_lock(); |
| /* Attempt to start with the pid of a thread */ |
| if (tid && (nr > 0)) { |
| pos = find_task_by_pid_ns(tid, ns); |
| if (pos && (pos->group_leader == leader)) |
| goto found; |
| } |
| |
| /* If nr exceeds the number of threads there is nothing todo */ |
| pos = NULL; |
| if (nr && nr >= get_nr_threads(leader)) |
| goto out; |
| |
| /* If we haven't found our starting place yet start |
| * with the leader and walk nr threads forward. |
| */ |
| for (pos = leader; nr > 0; --nr) { |
| pos = next_thread(pos); |
| if (pos == leader) { |
| pos = NULL; |
| goto out; |
| } |
| } |
| found: |
| get_task_struct(pos); |
| out: |
| rcu_read_unlock(); |
| return pos; |
| } |
| |
| /* |
| * Find the next thread in the thread list. |
| * Return NULL if there is an error or no next thread. |
| * |
| * The reference to the input task_struct is released. |
| */ |
| static struct task_struct *next_tid(struct task_struct *start) |
| { |
| struct task_struct *pos = NULL; |
| rcu_read_lock(); |
| if (pid_alive(start)) { |
| pos = next_thread(start); |
| if (thread_group_leader(pos)) |
| pos = NULL; |
| else |
| get_task_struct(pos); |
| } |
| rcu_read_unlock(); |
| put_task_struct(start); |
| return pos; |
| } |
| |
| static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| struct task_struct *task, int tid) |
| { |
| char name[PROC_NUMBUF]; |
| int len = snprintf(name, sizeof(name), "%d", tid); |
| return proc_fill_cache(filp, dirent, filldir, name, len, |
| proc_task_instantiate, task, NULL); |
| } |
| |
| /* for the /proc/TGID/task/ directories */ |
| static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| { |
| struct dentry *dentry = filp->f_path.dentry; |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *leader = NULL; |
| struct task_struct *task; |
| int retval = -ENOENT; |
| ino_t ino; |
| int tid; |
| unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
| struct pid_namespace *ns; |
| |
| task = get_proc_task(inode); |
| if (!task) |
| goto out_no_task; |
| rcu_read_lock(); |
| if (pid_alive(task)) { |
| leader = task->group_leader; |
| get_task_struct(leader); |
| } |
| rcu_read_unlock(); |
| put_task_struct(task); |
| if (!leader) |
| goto out_no_task; |
| retval = 0; |
| |
| switch (pos) { |
| case 0: |
| ino = inode->i_ino; |
| if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) |
| goto out; |
| pos++; |
| /* fall through */ |
| case 1: |
| ino = parent_ino(dentry); |
| if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) |
| goto out; |
| pos++; |
| /* fall through */ |
| } |
| |
| /* f_version caches the tgid value that the last readdir call couldn't |
| * return. lseek aka telldir automagically resets f_version to 0. |
| */ |
| ns = filp->f_dentry->d_sb->s_fs_info; |
| tid = (int)filp->f_version; |
| filp->f_version = 0; |
| for (task = first_tid(leader, tid, pos - 2, ns); |
| task; |
| task = next_tid(task), pos++) { |
| tid = task_pid_nr_ns(task, ns); |
| if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
| /* returning this tgid failed, save it as the first |
| * pid for the next readir call */ |
| filp->f_version = (u64)tid; |
| put_task_struct(task); |
| break; |
| } |
| } |
| out: |
| filp->f_pos = pos; |
| put_task_struct(leader); |
| out_no_task: |
| return retval; |
| } |
| |
| static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *p = get_proc_task(inode); |
| generic_fillattr(inode, stat); |
| |
| if (p) { |
| stat->nlink += get_nr_threads(p); |
| put_task_struct(p); |
| } |
| |
| return 0; |
| } |
| |
| static const struct inode_operations proc_task_inode_operations = { |
| .lookup = proc_task_lookup, |
| .getattr = proc_task_getattr, |
| .setattr = proc_setattr, |
| }; |
| |
| static const struct file_operations proc_task_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_task_readdir, |
| }; |