| /* |
| * 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/init.h> |
| #include <linux/capability.h> |
| #include <linux/file.h> |
| #include <linux/string.h> |
| #include <linux/seq_file.h> |
| #include <linux/namei.h> |
| #include <linux/namespace.h> |
| #include <linux/mm.h> |
| #include <linux/smp_lock.h> |
| #include <linux/rcupdate.h> |
| #include <linux/kallsyms.h> |
| #include <linux/mount.h> |
| #include <linux/security.h> |
| #include <linux/ptrace.h> |
| #include <linux/seccomp.h> |
| #include <linux/cpuset.h> |
| #include <linux/audit.h> |
| #include <linux/poll.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. |
| */ |
| |
| /* |
| * For hysterical raisins we keep the same inumbers as in the old procfs. |
| * Feel free to change the macro below - just keep the range distinct from |
| * inumbers of the rest of procfs (currently those are in 0x0000--0xffff). |
| * As soon as we'll get a separate superblock we will be able to forget |
| * about magical ranges too. |
| */ |
| |
| #define fake_ino(pid,ino) (((pid)<<16)|(ino)) |
| |
| enum pid_directory_inos { |
| PROC_TGID_INO = 2, |
| PROC_TGID_TASK, |
| PROC_TGID_STATUS, |
| PROC_TGID_MEM, |
| #ifdef CONFIG_SECCOMP |
| PROC_TGID_SECCOMP, |
| #endif |
| PROC_TGID_CWD, |
| PROC_TGID_ROOT, |
| PROC_TGID_EXE, |
| PROC_TGID_FD, |
| PROC_TGID_ENVIRON, |
| PROC_TGID_AUXV, |
| PROC_TGID_CMDLINE, |
| PROC_TGID_STAT, |
| PROC_TGID_STATM, |
| PROC_TGID_MAPS, |
| PROC_TGID_NUMA_MAPS, |
| PROC_TGID_MOUNTS, |
| PROC_TGID_MOUNTSTATS, |
| PROC_TGID_WCHAN, |
| #ifdef CONFIG_MMU |
| PROC_TGID_SMAPS, |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| PROC_TGID_SCHEDSTAT, |
| #endif |
| #ifdef CONFIG_CPUSETS |
| PROC_TGID_CPUSET, |
| #endif |
| #ifdef CONFIG_SECURITY |
| PROC_TGID_ATTR, |
| PROC_TGID_ATTR_CURRENT, |
| PROC_TGID_ATTR_PREV, |
| PROC_TGID_ATTR_EXEC, |
| PROC_TGID_ATTR_FSCREATE, |
| PROC_TGID_ATTR_KEYCREATE, |
| PROC_TGID_ATTR_SOCKCREATE, |
| #endif |
| #ifdef CONFIG_AUDITSYSCALL |
| PROC_TGID_LOGINUID, |
| #endif |
| PROC_TGID_OOM_SCORE, |
| PROC_TGID_OOM_ADJUST, |
| PROC_TID_INO, |
| PROC_TID_STATUS, |
| PROC_TID_MEM, |
| #ifdef CONFIG_SECCOMP |
| PROC_TID_SECCOMP, |
| #endif |
| PROC_TID_CWD, |
| PROC_TID_ROOT, |
| PROC_TID_EXE, |
| PROC_TID_FD, |
| PROC_TID_ENVIRON, |
| PROC_TID_AUXV, |
| PROC_TID_CMDLINE, |
| PROC_TID_STAT, |
| PROC_TID_STATM, |
| PROC_TID_MAPS, |
| PROC_TID_NUMA_MAPS, |
| PROC_TID_MOUNTS, |
| PROC_TID_MOUNTSTATS, |
| PROC_TID_WCHAN, |
| #ifdef CONFIG_MMU |
| PROC_TID_SMAPS, |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| PROC_TID_SCHEDSTAT, |
| #endif |
| #ifdef CONFIG_CPUSETS |
| PROC_TID_CPUSET, |
| #endif |
| #ifdef CONFIG_SECURITY |
| PROC_TID_ATTR, |
| PROC_TID_ATTR_CURRENT, |
| PROC_TID_ATTR_PREV, |
| PROC_TID_ATTR_EXEC, |
| PROC_TID_ATTR_FSCREATE, |
| PROC_TID_ATTR_KEYCREATE, |
| PROC_TID_ATTR_SOCKCREATE, |
| #endif |
| #ifdef CONFIG_AUDITSYSCALL |
| PROC_TID_LOGINUID, |
| #endif |
| PROC_TID_OOM_SCORE, |
| PROC_TID_OOM_ADJUST, |
| |
| /* Add new entries before this */ |
| PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */ |
| }; |
| |
| /* Worst case buffer size needed for holding an integer. */ |
| #define PROC_NUMBUF 10 |
| |
| struct pid_entry { |
| int type; |
| int len; |
| char *name; |
| mode_t mode; |
| }; |
| |
| #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)} |
| |
| static struct pid_entry tgid_base_stuff[] = { |
| E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO), |
| E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), |
| E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR), |
| E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR), |
| E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO), |
| E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), |
| E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO), |
| E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO), |
| E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO), |
| #ifdef CONFIG_NUMA |
| E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), |
| #endif |
| E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), |
| #ifdef CONFIG_SECCOMP |
| E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), |
| #endif |
| E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO), |
| E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO), |
| E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO), |
| E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO), |
| E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR), |
| #ifdef CONFIG_MMU |
| E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO), |
| #endif |
| #ifdef CONFIG_SECURITY |
| E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), |
| #endif |
| #ifdef CONFIG_KALLSYMS |
| E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO), |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO), |
| #endif |
| #ifdef CONFIG_CPUSETS |
| E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO), |
| #endif |
| E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), |
| E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR), |
| #ifdef CONFIG_AUDITSYSCALL |
| E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), |
| #endif |
| {0,0,NULL,0} |
| }; |
| static struct pid_entry tid_base_stuff[] = { |
| E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), |
| E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR), |
| E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR), |
| E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO), |
| E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), |
| E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO), |
| E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO), |
| E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO), |
| #ifdef CONFIG_NUMA |
| E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), |
| #endif |
| E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), |
| #ifdef CONFIG_SECCOMP |
| E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), |
| #endif |
| E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO), |
| E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO), |
| E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO), |
| E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO), |
| #ifdef CONFIG_MMU |
| E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO), |
| #endif |
| #ifdef CONFIG_SECURITY |
| E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), |
| #endif |
| #ifdef CONFIG_KALLSYMS |
| E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO), |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO), |
| #endif |
| #ifdef CONFIG_CPUSETS |
| E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO), |
| #endif |
| E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), |
| E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR), |
| #ifdef CONFIG_AUDITSYSCALL |
| E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), |
| #endif |
| {0,0,NULL,0} |
| }; |
| |
| #ifdef CONFIG_SECURITY |
| static struct pid_entry tgid_attr_stuff[] = { |
| E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), |
| E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TGID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TGID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO), |
| {0,0,NULL,0} |
| }; |
| static struct pid_entry tid_attr_stuff[] = { |
| E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), |
| E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO), |
| E(PROC_TID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO), |
| {0,0,NULL,0} |
| }; |
| #endif |
| |
| #undef E |
| |
| static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
| { |
| 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) { |
| *mnt = mntget(file->f_vfsmnt); |
| *dentry = dget(file->f_dentry); |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| return 0; |
| } |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| } |
| return -ENOENT; |
| } |
| |
| 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) |
| { |
| /* Must be called with the rcu_read_lock held */ |
| 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 dentry **dentry, struct vfsmount **mnt) |
| { |
| 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); |
| *mnt = mntget(fs->pwdmnt); |
| *dentry = dget(fs->pwd); |
| read_unlock(&fs->lock); |
| result = 0; |
| put_fs_struct(fs); |
| } |
| return result; |
| } |
| |
| static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
| { |
| 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); |
| *mnt = mntget(fs->rootmnt); |
| *dentry = dget(fs->root); |
| read_unlock(&fs->lock); |
| result = 0; |
| put_fs_struct(fs); |
| } |
| return result; |
| } |
| |
| #define MAY_PTRACE(task) \ |
| (task == current || \ |
| (task->parent == current && \ |
| (task->ptrace & PT_PTRACED) && \ |
| (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \ |
| security_ptrace(current,task) == 0)) |
| |
| static int proc_pid_environ(struct task_struct *task, char * buffer) |
| { |
| int res = 0; |
| struct mm_struct *mm = get_task_mm(task); |
| if (mm) { |
| unsigned int len = mm->env_end - mm->env_start; |
| if (len > PAGE_SIZE) |
| len = PAGE_SIZE; |
| res = access_process_vm(task, mm->env_start, buffer, len, 0); |
| if (!ptrace_may_attach(task)) |
| res = -ESRCH; |
| mmput(mm); |
| } |
| return res; |
| } |
| |
| 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) |
| { |
| char *modname; |
| const char *sym_name; |
| unsigned long wchan, size, offset; |
| char namebuf[KSYM_NAME_LEN+1]; |
| |
| wchan = get_wchan(task); |
| |
| sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf); |
| if (sym_name) |
| return sprintf(buffer, "%s", sym_name); |
| return sprintf(buffer, "%lu", wchan); |
| } |
| #endif /* CONFIG_KALLSYMS */ |
| |
| #ifdef CONFIG_SCHEDSTATS |
| /* |
| * Provides /proc/PID/schedstat |
| */ |
| static int proc_pid_schedstat(struct task_struct *task, char *buffer) |
| { |
| return sprintf(buffer, "%lu %lu %lu\n", |
| task->sched_info.cpu_time, |
| task->sched_info.run_delay, |
| task->sched_info.pcnt); |
| } |
| #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); |
| points = badness(task, uptime.tv_sec); |
| return sprintf(buffer, "%lu\n", points); |
| } |
| |
| /************************************************************************/ |
| /* 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_attach(task); |
| put_task_struct(task); |
| } |
| return allowed; |
| } |
| |
| extern struct seq_operations mounts_op; |
| struct proc_mounts { |
| struct seq_file m; |
| int event; |
| }; |
| |
| static int mounts_open(struct inode *inode, struct file *file) |
| { |
| struct task_struct *task = get_proc_task(inode); |
| struct namespace *namespace = NULL; |
| struct proc_mounts *p; |
| int ret = -EINVAL; |
| |
| if (task) { |
| task_lock(task); |
| namespace = task->namespace; |
| if (namespace) |
| get_namespace(namespace); |
| task_unlock(task); |
| put_task_struct(task); |
| } |
| |
| if (namespace) { |
| ret = -ENOMEM; |
| p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); |
| if (p) { |
| file->private_data = &p->m; |
| ret = seq_open(file, &mounts_op); |
| if (!ret) { |
| p->m.private = namespace; |
| p->event = namespace->event; |
| return 0; |
| } |
| kfree(p); |
| } |
| put_namespace(namespace); |
| } |
| return ret; |
| } |
| |
| static int mounts_release(struct inode *inode, struct file *file) |
| { |
| struct seq_file *m = file->private_data; |
| struct namespace *namespace = m->private; |
| put_namespace(namespace); |
| return seq_release(inode, file); |
| } |
| |
| static unsigned mounts_poll(struct file *file, poll_table *wait) |
| { |
| struct proc_mounts *p = file->private_data; |
| struct namespace *ns = p->m.private; |
| 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 struct file_operations proc_mounts_operations = { |
| .open = mounts_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = mounts_release, |
| .poll = mounts_poll, |
| }; |
| |
| extern struct seq_operations mountstats_op; |
| static int mountstats_open(struct inode *inode, struct file *file) |
| { |
| int ret = seq_open(file, &mountstats_op); |
| |
| if (!ret) { |
| struct seq_file *m = file->private_data; |
| struct namespace *namespace = NULL; |
| struct task_struct *task = get_proc_task(inode); |
| |
| if (task) { |
| task_lock(task); |
| namespace = task->namespace; |
| if (namespace) |
| get_namespace(namespace); |
| task_unlock(task); |
| put_task_struct(task); |
| } |
| |
| if (namespace) |
| m->private = namespace; |
| else { |
| seq_release(inode, file); |
| ret = -EINVAL; |
| } |
| } |
| return ret; |
| } |
| |
| static 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_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_KERNEL))) |
| 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 struct file_operations proc_info_file_operations = { |
| .read = proc_info_read, |
| }; |
| |
| 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_dentry->d_inode); |
| char *page; |
| unsigned long src = *ppos; |
| int ret = -ESRCH; |
| struct mm_struct *mm; |
| |
| if (!task) |
| goto out_no_task; |
| |
| if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
| goto out; |
| |
| ret = -ENOMEM; |
| page = (char *)__get_free_page(GFP_USER); |
| 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 || !MAY_PTRACE(task) || !ptrace_may_attach(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 * buf, |
| size_t count, loff_t *ppos) |
| { |
| int copied = 0; |
| char *page; |
| struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| unsigned long dst = *ppos; |
| |
| copied = -ESRCH; |
| if (!task) |
| goto out_no_task; |
| |
| if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
| goto out; |
| |
| copied = -ENOMEM; |
| page = (char *)__get_free_page(GFP_USER); |
| if (!page) |
| goto out; |
| |
| 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 |
| |
| static 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 struct file_operations proc_mem_operations = { |
| .llseek = mem_lseek, |
| .read = mem_read, |
| .write = mem_write, |
| .open = mem_open, |
| }; |
| |
| 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_dentry->d_inode); |
| char buffer[PROC_NUMBUF]; |
| size_t len; |
| int oom_adjust; |
| loff_t __ppos = *ppos; |
| |
| if (!task) |
| return -ESRCH; |
| oom_adjust = task->oomkilladj; |
| put_task_struct(task); |
| |
| len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
| if (__ppos >= len) |
| return 0; |
| if (count > len-__ppos) |
| count = len-__ppos; |
| if (copy_to_user(buf, buffer + __ppos, count)) |
| return -EFAULT; |
| *ppos = __ppos + count; |
| return count; |
| } |
| |
| 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; |
| |
| 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; |
| oom_adjust = simple_strtol(buffer, &end, 0); |
| if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE) |
| return -EINVAL; |
| if (*end == '\n') |
| end++; |
| task = get_proc_task(file->f_dentry->d_inode); |
| if (!task) |
| return -ESRCH; |
| task->oomkilladj = oom_adjust; |
| put_task_struct(task); |
| if (end - buffer == 0) |
| return -EIO; |
| return end - buffer; |
| } |
| |
| static 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_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->audit_context)); |
| 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_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_USER); |
| 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 struct file_operations proc_loginuid_operations = { |
| .read = proc_loginuid_read, |
| .write = proc_loginuid_write, |
| }; |
| #endif |
| |
| #ifdef CONFIG_SECCOMP |
| static ssize_t seccomp_read(struct file *file, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode); |
| char __buf[20]; |
| loff_t __ppos = *ppos; |
| size_t len; |
| |
| if (!tsk) |
| return -ESRCH; |
| /* no need to print the trailing zero, so use only len */ |
| len = sprintf(__buf, "%u\n", tsk->seccomp.mode); |
| put_task_struct(tsk); |
| if (__ppos >= len) |
| return 0; |
| if (count > len - __ppos) |
| count = len - __ppos; |
| if (copy_to_user(buf, __buf + __ppos, count)) |
| return -EFAULT; |
| *ppos = __ppos + count; |
| return count; |
| } |
| |
| static ssize_t seccomp_write(struct file *file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode); |
| char __buf[20], *end; |
| unsigned int seccomp_mode; |
| ssize_t result; |
| |
| result = -ESRCH; |
| if (!tsk) |
| goto out_no_task; |
| |
| /* can set it only once to be even more secure */ |
| result = -EPERM; |
| if (unlikely(tsk->seccomp.mode)) |
| goto out; |
| |
| result = -EFAULT; |
| memset(__buf, 0, sizeof(__buf)); |
| count = min(count, sizeof(__buf) - 1); |
| if (copy_from_user(__buf, buf, count)) |
| goto out; |
| |
| seccomp_mode = simple_strtoul(__buf, &end, 0); |
| if (*end == '\n') |
| end++; |
| result = -EINVAL; |
| if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) { |
| tsk->seccomp.mode = seccomp_mode; |
| set_tsk_thread_flag(tsk, TIF_SECCOMP); |
| } else |
| goto out; |
| result = -EIO; |
| if (unlikely(!(end - __buf))) |
| goto out; |
| result = end - __buf; |
| out: |
| put_task_struct(tsk); |
| out_no_task: |
| return result; |
| } |
| |
| static struct file_operations proc_seccomp_operations = { |
| .read = seccomp_read, |
| .write = seccomp_write, |
| }; |
| #endif /* CONFIG_SECCOMP */ |
| |
| 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_release(nd); |
| |
| /* 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->dentry, &nd->mnt); |
| nd->last_type = LAST_BIND; |
| out: |
| return ERR_PTR(error); |
| } |
| |
| static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, |
| char __user *buffer, int buflen) |
| { |
| struct inode * inode; |
| char *tmp = (char*)__get_free_page(GFP_KERNEL), *path; |
| int len; |
| |
| if (!tmp) |
| return -ENOMEM; |
| |
| inode = dentry->d_inode; |
| path = d_path(dentry, mnt, tmp, PAGE_SIZE); |
| len = PTR_ERR(path); |
| if (IS_ERR(path)) |
| goto out; |
| len = tmp + PAGE_SIZE - 1 - path; |
| |
| if (len > buflen) |
| len = buflen; |
| if (copy_to_user(buffer, path, 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 dentry *de; |
| struct vfsmount *mnt = NULL; |
| |
| /* 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, &de, &mnt); |
| if (error) |
| goto out; |
| |
| error = do_proc_readlink(de, mnt, buffer, buflen); |
| dput(de); |
| mntput(mnt); |
| out: |
| return error; |
| } |
| |
| static struct inode_operations proc_pid_link_inode_operations = { |
| .readlink = proc_pid_readlink, |
| .follow_link = proc_pid_follow_link |
| }; |
| |
| static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir) |
| { |
| struct dentry *dentry = filp->f_dentry; |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *p = get_proc_task(inode); |
| unsigned int fd, tid, ino; |
| int retval; |
| char buf[PROC_NUMBUF]; |
| struct files_struct * files; |
| struct fdtable *fdt; |
| |
| retval = -ENOENT; |
| if (!p) |
| goto out_no_task; |
| retval = 0; |
| tid = p->pid; |
| |
| 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(); |
| fdt = files_fdtable(files); |
| for (fd = filp->f_pos-2; |
| fd < fdt->max_fds; |
| fd++, filp->f_pos++) { |
| unsigned int i,j; |
| |
| if (!fcheck_files(files, fd)) |
| continue; |
| rcu_read_unlock(); |
| |
| j = PROC_NUMBUF; |
| i = fd; |
| do { |
| j--; |
| buf[j] = '0' + (i % 10); |
| i /= 10; |
| } while (i); |
| |
| ino = fake_ino(tid, PROC_TID_FD_DIR + fd); |
| if (filldir(dirent, buf+j, PROC_NUMBUF-j, fd+2, ino, DT_LNK) < 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 int proc_pident_readdir(struct file *filp, |
| void *dirent, filldir_t filldir, |
| struct pid_entry *ents, unsigned int nents) |
| { |
| int i; |
| int pid; |
| struct dentry *dentry = filp->f_dentry; |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *task = get_proc_task(inode); |
| struct pid_entry *p; |
| ino_t ino; |
| int ret; |
| |
| ret = -ENOENT; |
| if (!task) |
| goto out; |
| |
| ret = 0; |
| pid = task->pid; |
| put_task_struct(task); |
| 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; |
| while (p->name) { |
| if (filldir(dirent, p->name, p->len, filp->f_pos, |
| fake_ino(pid, p->type), p->mode >> 12) < 0) |
| goto out; |
| filp->f_pos++; |
| p++; |
| } |
| } |
| |
| ret = 1; |
| out: |
| return ret; |
| } |
| |
| 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 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)); |
| } |
| |
| /* 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 = mm->dumpable; |
| 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, int ino) |
| { |
| 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_ino = fake_ino(task->pid, ino); |
| |
| /* |
| * grab the reference to task. |
| */ |
| ei->pid = get_pid(task->pids[PIDTYPE_PID].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; |
| } |
| |
| /* 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 = 0; |
| } |
| security_task_to_inode(task, inode); |
| put_task_struct(task); |
| return 1; |
| } |
| d_drop(dentry); |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| 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 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 tid_fd_dentry_operations = |
| { |
| .d_revalidate = tid_fd_revalidate, |
| .d_delete = pid_delete_dentry, |
| }; |
| |
| static struct dentry_operations pid_dentry_operations = |
| { |
| .d_revalidate = pid_revalidate, |
| .d_delete = pid_delete_dentry, |
| }; |
| |
| /* Lookups */ |
| |
| 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; |
| } |
| |
| /* SMP-safe */ |
| static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd) |
| { |
| struct task_struct *task = get_proc_task(dir); |
| unsigned fd = name_to_int(dentry); |
| struct dentry *result = ERR_PTR(-ENOENT); |
| struct file * file; |
| struct files_struct * files; |
| struct inode *inode; |
| struct proc_inode *ei; |
| |
| if (!task) |
| goto out_no_task; |
| if (fd == ~0U) |
| goto out; |
| |
| inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd); |
| if (!inode) |
| goto out; |
| ei = PROC_I(inode); |
| ei->fd = fd; |
| files = get_files_struct(task); |
| if (!files) |
| goto out_unlock; |
| 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_unlock2; |
| 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)) |
| result = NULL; |
| out: |
| put_task_struct(task); |
| out_no_task: |
| return result; |
| |
| out_unlock2: |
| spin_unlock(&files->file_lock); |
| put_files_struct(files); |
| out_unlock: |
| iput(inode); |
| goto out; |
| } |
| |
| static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir); |
| static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd); |
| static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); |
| |
| static struct file_operations proc_fd_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_readfd, |
| }; |
| |
| static struct file_operations proc_task_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_task_readdir, |
| }; |
| |
| /* |
| * proc directories can do almost nothing.. |
| */ |
| static struct inode_operations proc_fd_inode_operations = { |
| .lookup = proc_lookupfd, |
| }; |
| |
| static struct inode_operations proc_task_inode_operations = { |
| .lookup = proc_task_lookup, |
| .getattr = proc_task_getattr, |
| }; |
| |
| #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_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 > PAGE_SIZE) |
| count = PAGE_SIZE; |
| length = -ENOMEM; |
| if (!(page = __get_free_page(GFP_KERNEL))) |
| goto out; |
| |
| length = security_getprocattr(task, |
| (char*)file->f_dentry->d_name.name, |
| (void*)page, count); |
| 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 ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode * inode = file->f_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_USER); |
| if (!page) |
| goto out; |
| |
| length = -EFAULT; |
| if (copy_from_user(page, buf, count)) |
| goto out_free; |
| |
| length = security_setprocattr(task, |
| (char*)file->f_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 struct file_operations proc_pid_attr_operations = { |
| .read = proc_pid_attr_read, |
| .write = proc_pid_attr_write, |
| }; |
| |
| static struct file_operations proc_tid_attr_operations; |
| static struct inode_operations proc_tid_attr_inode_operations; |
| static struct file_operations proc_tgid_attr_operations; |
| static struct inode_operations proc_tgid_attr_inode_operations; |
| #endif |
| |
| /* SMP-safe */ |
| static struct dentry *proc_pident_lookup(struct inode *dir, |
| struct dentry *dentry, |
| struct pid_entry *ents) |
| { |
| struct inode *inode; |
| struct dentry *error; |
| struct task_struct *task = get_proc_task(dir); |
| struct pid_entry *p; |
| struct proc_inode *ei; |
| |
| error = ERR_PTR(-ENOENT); |
| inode = NULL; |
| |
| if (!task) |
| goto out_no_task; |
| |
| for (p = ents; p->name; p++) { |
| if (p->len != dentry->d_name.len) |
| continue; |
| if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| break; |
| } |
| if (!p->name) |
| goto out; |
| |
| error = ERR_PTR(-EINVAL); |
| inode = proc_pid_make_inode(dir->i_sb, task, p->type); |
| if (!inode) |
| goto out; |
| |
| ei = PROC_I(inode); |
| inode->i_mode = p->mode; |
| /* |
| * Yes, it does not scale. And it should not. Don't add |
| * new entries into /proc/<tgid>/ without very good reasons. |
| */ |
| switch(p->type) { |
| case PROC_TGID_TASK: |
| inode->i_nlink = 2; |
| inode->i_op = &proc_task_inode_operations; |
| inode->i_fop = &proc_task_operations; |
| break; |
| case PROC_TID_FD: |
| case PROC_TGID_FD: |
| inode->i_nlink = 2; |
| inode->i_op = &proc_fd_inode_operations; |
| inode->i_fop = &proc_fd_operations; |
| break; |
| case PROC_TID_EXE: |
| case PROC_TGID_EXE: |
| inode->i_op = &proc_pid_link_inode_operations; |
| ei->op.proc_get_link = proc_exe_link; |
| break; |
| case PROC_TID_CWD: |
| case PROC_TGID_CWD: |
| inode->i_op = &proc_pid_link_inode_operations; |
| ei->op.proc_get_link = proc_cwd_link; |
| break; |
| case PROC_TID_ROOT: |
| case PROC_TGID_ROOT: |
| inode->i_op = &proc_pid_link_inode_operations; |
| ei->op.proc_get_link = proc_root_link; |
| break; |
| case PROC_TID_ENVIRON: |
| case PROC_TGID_ENVIRON: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_environ; |
| break; |
| case PROC_TID_AUXV: |
| case PROC_TGID_AUXV: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_auxv; |
| break; |
| case PROC_TID_STATUS: |
| case PROC_TGID_STATUS: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_status; |
| break; |
| case PROC_TID_STAT: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_tid_stat; |
| break; |
| case PROC_TGID_STAT: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_tgid_stat; |
| break; |
| case PROC_TID_CMDLINE: |
| case PROC_TGID_CMDLINE: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_cmdline; |
| break; |
| case PROC_TID_STATM: |
| case PROC_TGID_STATM: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_statm; |
| break; |
| case PROC_TID_MAPS: |
| case PROC_TGID_MAPS: |
| inode->i_fop = &proc_maps_operations; |
| break; |
| #ifdef CONFIG_NUMA |
| case PROC_TID_NUMA_MAPS: |
| case PROC_TGID_NUMA_MAPS: |
| inode->i_fop = &proc_numa_maps_operations; |
| break; |
| #endif |
| case PROC_TID_MEM: |
| case PROC_TGID_MEM: |
| inode->i_fop = &proc_mem_operations; |
| break; |
| #ifdef CONFIG_SECCOMP |
| case PROC_TID_SECCOMP: |
| case PROC_TGID_SECCOMP: |
| inode->i_fop = &proc_seccomp_operations; |
| break; |
| #endif /* CONFIG_SECCOMP */ |
| case PROC_TID_MOUNTS: |
| case PROC_TGID_MOUNTS: |
| inode->i_fop = &proc_mounts_operations; |
| break; |
| #ifdef CONFIG_MMU |
| case PROC_TID_SMAPS: |
| case PROC_TGID_SMAPS: |
| inode->i_fop = &proc_smaps_operations; |
| break; |
| #endif |
| case PROC_TID_MOUNTSTATS: |
| case PROC_TGID_MOUNTSTATS: |
| inode->i_fop = &proc_mountstats_operations; |
| break; |
| #ifdef CONFIG_SECURITY |
| case PROC_TID_ATTR: |
| inode->i_nlink = 2; |
| inode->i_op = &proc_tid_attr_inode_operations; |
| inode->i_fop = &proc_tid_attr_operations; |
| break; |
| case PROC_TGID_ATTR: |
| inode->i_nlink = 2; |
| inode->i_op = &proc_tgid_attr_inode_operations; |
| inode->i_fop = &proc_tgid_attr_operations; |
| break; |
| case PROC_TID_ATTR_CURRENT: |
| case PROC_TGID_ATTR_CURRENT: |
| case PROC_TID_ATTR_PREV: |
| case PROC_TGID_ATTR_PREV: |
| case PROC_TID_ATTR_EXEC: |
| case PROC_TGID_ATTR_EXEC: |
| case PROC_TID_ATTR_FSCREATE: |
| case PROC_TGID_ATTR_FSCREATE: |
| case PROC_TID_ATTR_KEYCREATE: |
| case PROC_TGID_ATTR_KEYCREATE: |
| case PROC_TID_ATTR_SOCKCREATE: |
| case PROC_TGID_ATTR_SOCKCREATE: |
| inode->i_fop = &proc_pid_attr_operations; |
| break; |
| #endif |
| #ifdef CONFIG_KALLSYMS |
| case PROC_TID_WCHAN: |
| case PROC_TGID_WCHAN: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_wchan; |
| break; |
| #endif |
| #ifdef CONFIG_SCHEDSTATS |
| case PROC_TID_SCHEDSTAT: |
| case PROC_TGID_SCHEDSTAT: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_pid_schedstat; |
| break; |
| #endif |
| #ifdef CONFIG_CPUSETS |
| case PROC_TID_CPUSET: |
| case PROC_TGID_CPUSET: |
| inode->i_fop = &proc_cpuset_operations; |
| break; |
| #endif |
| case PROC_TID_OOM_SCORE: |
| case PROC_TGID_OOM_SCORE: |
| inode->i_fop = &proc_info_file_operations; |
| ei->op.proc_read = proc_oom_score; |
| break; |
| case PROC_TID_OOM_ADJUST: |
| case PROC_TGID_OOM_ADJUST: |
| inode->i_fop = &proc_oom_adjust_operations; |
| break; |
| #ifdef CONFIG_AUDITSYSCALL |
| case PROC_TID_LOGINUID: |
| case PROC_TGID_LOGINUID: |
| inode->i_fop = &proc_loginuid_operations; |
| break; |
| #endif |
| default: |
| printk("procfs: impossible type (%d)",p->type); |
| iput(inode); |
| error = ERR_PTR(-EINVAL); |
| goto out; |
| } |
| 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: |
| put_task_struct(task); |
| out_no_task: |
| return error; |
| } |
| |
| 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); |
| } |
| |
| 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); |
| } |
| |
| static struct file_operations proc_tgid_base_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_tgid_base_readdir, |
| }; |
| |
| static struct file_operations proc_tid_base_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_tid_base_readdir, |
| }; |
| |
| static struct inode_operations proc_tgid_base_inode_operations = { |
| .lookup = proc_tgid_base_lookup, |
| .getattr = pid_getattr, |
| }; |
| |
| static struct inode_operations proc_tid_base_inode_operations = { |
| .lookup = proc_tid_base_lookup, |
| .getattr = pid_getattr, |
| }; |
| |
| #ifdef CONFIG_SECURITY |
| static int proc_tgid_attr_readdir(struct file * filp, |
| void * dirent, filldir_t filldir) |
| { |
| return proc_pident_readdir(filp,dirent,filldir, |
| tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff)); |
| } |
| |
| static int proc_tid_attr_readdir(struct file * filp, |
| void * dirent, filldir_t filldir) |
| { |
| return proc_pident_readdir(filp,dirent,filldir, |
| tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff)); |
| } |
| |
| static struct file_operations proc_tgid_attr_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_tgid_attr_readdir, |
| }; |
| |
| static struct file_operations proc_tid_attr_operations = { |
| .read = generic_read_dir, |
| .readdir = proc_tid_attr_readdir, |
| }; |
| |
| static struct dentry *proc_tgid_attr_lookup(struct inode *dir, |
| struct dentry *dentry, struct nameidata *nd) |
| { |
| return proc_pident_lookup(dir, dentry, tgid_attr_stuff); |
| } |
| |
| static struct dentry *proc_tid_attr_lookup(struct inode *dir, |
| struct dentry *dentry, struct nameidata *nd) |
| { |
| return proc_pident_lookup(dir, dentry, tid_attr_stuff); |
| } |
| |
| static struct inode_operations proc_tgid_attr_inode_operations = { |
| .lookup = proc_tgid_attr_lookup, |
| .getattr = pid_getattr, |
| }; |
| |
| static struct inode_operations proc_tid_attr_inode_operations = { |
| .lookup = proc_tid_attr_lookup, |
| .getattr = pid_getattr, |
| }; |
| #endif |
| |
| /* |
| * /proc/self: |
| */ |
| static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| int buflen) |
| { |
| char tmp[PROC_NUMBUF]; |
| sprintf(tmp, "%d", current->tgid); |
| return vfs_readlink(dentry,buffer,buflen,tmp); |
| } |
| |
| static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
| { |
| char tmp[PROC_NUMBUF]; |
| sprintf(tmp, "%d", current->tgid); |
| return ERR_PTR(vfs_follow_link(nd,tmp)); |
| } |
| |
| static struct inode_operations proc_self_inode_operations = { |
| .readlink = proc_self_readlink, |
| .follow_link = proc_self_follow_link, |
| }; |
| |
| /** |
| * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| * |
| * @task: task that should be flushed. |
| * |
| * 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) |
| { |
| struct dentry *dentry, *leader, *dir; |
| char buf[PROC_NUMBUF]; |
| struct qstr name; |
| |
| name.name = buf; |
| name.len = snprintf(buf, sizeof(buf), "%d", task->pid); |
| dentry = d_hash_and_lookup(proc_mnt->mnt_root, &name); |
| if (dentry) { |
| shrink_dcache_parent(dentry); |
| d_drop(dentry); |
| dput(dentry); |
| } |
| |
| if (thread_group_leader(task)) |
| goto out; |
| |
| name.name = buf; |
| name.len = snprintf(buf, sizeof(buf), "%d", task->tgid); |
| leader = d_hash_and_lookup(proc_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", task->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; |
| } |
| |
| /* SMP-safe */ |
| struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| { |
| struct dentry *result = ERR_PTR(-ENOENT); |
| struct task_struct *task; |
| struct inode *inode; |
| struct proc_inode *ei; |
| unsigned tgid; |
| |
| if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) { |
| inode = new_inode(dir->i_sb); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| ei = PROC_I(inode); |
| inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| inode->i_ino = fake_ino(0, PROC_TGID_INO); |
| ei->pde = NULL; |
| inode->i_mode = S_IFLNK|S_IRWXUGO; |
| inode->i_uid = inode->i_gid = 0; |
| inode->i_size = 64; |
| inode->i_op = &proc_self_inode_operations; |
| d_add(dentry, inode); |
| return NULL; |
| } |
| tgid = name_to_int(dentry); |
| if (tgid == ~0U) |
| goto out; |
| |
| rcu_read_lock(); |
| task = find_task_by_pid(tgid); |
| if (task) |
| get_task_struct(task); |
| rcu_read_unlock(); |
| if (!task) |
| goto out; |
| |
| inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO); |
| if (!inode) |
| goto out_put_task; |
| |
| 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; |
| #ifdef CONFIG_SECURITY |
| inode->i_nlink = 5; |
| #else |
| inode->i_nlink = 4; |
| #endif |
| |
| 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)) |
| result = NULL; |
| |
| out_put_task: |
| put_task_struct(task); |
| out: |
| return result; |
| } |
| |
| /* SMP-safe */ |
| 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); |
| struct inode *inode; |
| unsigned tid; |
| |
| if (!leader) |
| goto out_no_task; |
| |
| tid = name_to_int(dentry); |
| if (tid == ~0U) |
| goto out; |
| |
| rcu_read_lock(); |
| task = find_task_by_pid(tid); |
| if (task) |
| get_task_struct(task); |
| rcu_read_unlock(); |
| if (!task) |
| goto out; |
| if (leader->tgid != task->tgid) |
| goto out_drop_task; |
| |
| inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO); |
| |
| |
| if (!inode) |
| goto out_drop_task; |
| 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; |
| #ifdef CONFIG_SECURITY |
| inode->i_nlink = 4; |
| #else |
| inode->i_nlink = 3; |
| #endif |
| |
| 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)) |
| result = NULL; |
| |
| out_drop_task: |
| put_task_struct(task); |
| out: |
| put_task_struct(leader); |
| out_no_task: |
| return result; |
| } |
| |
| /* |
| * Find the first tgid to return to user space. |
| * |
| * Usually this is just whatever follows &init_task, but if the users |
| * buffer was too small to hold the full list or there was a seek into |
| * the middle of the directory we have more work to do. |
| * |
| * In the case of a short read we start with find_task_by_pid. |
| * |
| * In the case of a seek we start with &init_task and walk nr |
| * threads past it. |
| */ |
| static struct task_struct *first_tgid(int tgid, unsigned int nr) |
| { |
| struct task_struct *pos; |
| rcu_read_lock(); |
| if (tgid && nr) { |
| pos = find_task_by_pid(tgid); |
| if (pos && thread_group_leader(pos)) |
| goto found; |
| } |
| /* If nr exceeds the number of processes get out quickly */ |
| pos = NULL; |
| if (nr && nr >= nr_processes()) |
| goto done; |
| |
| /* If we haven't found our starting place yet start with |
| * the init_task and walk nr tasks forward. |
| */ |
| for (pos = next_task(&init_task); nr > 0; --nr) { |
| pos = next_task(pos); |
| if (pos == &init_task) { |
| pos = NULL; |
| goto done; |
| } |
| } |
| found: |
| get_task_struct(pos); |
| done: |
| rcu_read_unlock(); |
| return pos; |
| } |
| |
| /* |
| * Find the next task in the task list. |
| * Return NULL if we loop or there is any error. |
| * |
| * The reference to the input task_struct is released. |
| */ |
| static struct task_struct *next_tgid(struct task_struct *start) |
| { |
| struct task_struct *pos; |
| rcu_read_lock(); |
| pos = start; |
| if (pid_alive(start)) |
| pos = next_task(start); |
| if (pid_alive(pos) && (pos != &init_task)) { |
| get_task_struct(pos); |
| goto done; |
| } |
| pos = NULL; |
| done: |
| rcu_read_unlock(); |
| put_task_struct(start); |
| return pos; |
| } |
| |
| /* for the /proc/ directory itself, after non-process stuff has been done */ |
| int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| { |
| char buf[PROC_NUMBUF]; |
| unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
| struct task_struct *task; |
| int tgid; |
| |
| if (!nr) { |
| ino_t ino = fake_ino(0,PROC_TGID_INO); |
| if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0) |
| return 0; |
| filp->f_pos++; |
| nr++; |
| } |
| nr -= 1; |
| |
| /* f_version caches the tgid value that the last readdir call couldn't |
| * return. lseek aka telldir automagically resets f_version to 0. |
| */ |
| tgid = filp->f_version; |
| filp->f_version = 0; |
| for (task = first_tgid(tgid, nr); |
| task; |
| task = next_tgid(task), filp->f_pos++) { |
| int len; |
| ino_t ino; |
| tgid = task->pid; |
| len = snprintf(buf, sizeof(buf), "%d", tgid); |
| ino = fake_ino(tgid, PROC_TGID_INO); |
| if (filldir(dirent, buf, len, filp->f_pos, ino, DT_DIR) < 0) { |
| /* returning this tgid failed, save it as the first |
| * pid for the next readir call */ |
| filp->f_version = tgid; |
| put_task_struct(task); |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * 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 task_struct *pos; |
| |
| rcu_read_lock(); |
| /* Attempt to start with the pid of a thread */ |
| if (tid && (nr > 0)) { |
| pos = find_task_by_pid(tid); |
| 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; |
| } |
| |
| /* for the /proc/TGID/task/ directories */ |
| static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| { |
| char buf[PROC_NUMBUF]; |
| struct dentry *dentry = filp->f_dentry; |
| struct inode *inode = dentry->d_inode; |
| struct task_struct *leader = get_proc_task(inode); |
| struct task_struct *task; |
| int retval = -ENOENT; |
| ino_t ino; |
| int tid; |
| unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
| |
| 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. |
| */ |
| tid = filp->f_version; |
| filp->f_version = 0; |
| for (task = first_tid(leader, tid, pos - 2); |
| task; |
| task = next_tid(task), pos++) { |
| int len; |
| tid = task->pid; |
| len = snprintf(buf, sizeof(buf), "%d", tid); |
| ino = fake_ino(tid, PROC_TID_INO); |
| if (filldir(dirent, buf, len, pos, ino, DT_DIR < 0)) { |
| /* returning this tgid failed, save it as the first |
| * pid for the next readir call */ |
| filp->f_version = 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) { |
| rcu_read_lock(); |
| stat->nlink += get_nr_threads(p); |
| rcu_read_unlock(); |
| put_task_struct(p); |
| } |
| |
| return 0; |
| } |