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-rw-r--r--fs/proc/base.c2056
1 files changed, 2056 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
new file mode 100644
index 00000000000..dad8ea4e00a
--- /dev/null
+++ b/fs/proc/base.c
@@ -0,0 +1,2056 @@
+/*
+ * 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.
+ */
+
+#include <asm/uaccess.h>
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.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/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 "internal.h"
+
+/*
+ * 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_MOUNTS,
+ PROC_TGID_WCHAN,
+#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,
+#endif
+#ifdef CONFIG_AUDITSYSCALL
+ PROC_TGID_LOGINUID,
+#endif
+ PROC_TGID_FD_DIR,
+ 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_MOUNTS,
+ PROC_TID_WCHAN,
+#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,
+#endif
+#ifdef CONFIG_AUDITSYSCALL
+ PROC_TID_LOGINUID,
+#endif
+ PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
+ PROC_TID_OOM_SCORE,
+ PROC_TID_OOM_ADJUST,
+};
+
+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),
+ 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),
+#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),
+ 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_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),
+ {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),
+ {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 = proc_task(inode);
+ struct files_struct *files;
+ struct file *file;
+ int fd = proc_type(inode) - PROC_TID_FD_DIR;
+
+ files = get_files_struct(task);
+ if (files) {
+ 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 int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+{
+ struct fs_struct *fs;
+ int result = -ENOENT;
+ task_lock(proc_task(inode));
+ fs = proc_task(inode)->fs;
+ if(fs)
+ atomic_inc(&fs->count);
+ task_unlock(proc_task(inode));
+ 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 fs_struct *fs;
+ int result = -ENOENT;
+ task_lock(proc_task(inode));
+ fs = proc_task(inode)->fs;
+ if(fs)
+ atomic_inc(&fs->count);
+ task_unlock(proc_task(inode));
+ 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 may_ptrace_attach(struct task_struct *task)
+{
+ int retval = 0;
+
+ task_lock(task);
+
+ if (!task->mm)
+ goto out;
+ if (((current->uid != task->euid) ||
+ (current->uid != task->suid) ||
+ (current->uid != task->uid) ||
+ (current->gid != task->egid) ||
+ (current->gid != task->sgid) ||
+ (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
+ goto out;
+ rmb();
+ if (!task->mm->dumpable && !capable(CAP_SYS_PTRACE))
+ goto out;
+ if (security_ptrace(current, task))
+ goto out;
+
+ retval = 1;
+out:
+ task_unlock(task);
+ return retval;
+}
+
+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 (!may_ptrace_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_check_root(struct inode *inode)
+{
+ struct dentry *de, *base, *root;
+ struct vfsmount *our_vfsmnt, *vfsmnt, *mnt;
+ int res = 0;
+
+ if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
+ return -ENOENT;
+ read_lock(&current->fs->lock);
+ our_vfsmnt = mntget(current->fs->rootmnt);
+ base = dget(current->fs->root);
+ read_unlock(&current->fs->lock);
+
+ spin_lock(&vfsmount_lock);
+ de = root;
+ mnt = vfsmnt;
+
+ while (vfsmnt != our_vfsmnt) {
+ if (vfsmnt == vfsmnt->mnt_parent)
+ goto out;
+ de = vfsmnt->mnt_mountpoint;
+ vfsmnt = vfsmnt->mnt_parent;
+ }
+
+ if (!is_subdir(de, base))
+ goto out;
+ spin_unlock(&vfsmount_lock);
+
+exit:
+ dput(base);
+ mntput(our_vfsmnt);
+ dput(root);
+ mntput(mnt);
+ return res;
+out:
+ spin_unlock(&vfsmount_lock);
+ res = -EACCES;
+ goto exit;
+}
+
+static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ if (generic_permission(inode, mask, NULL) != 0)
+ return -EACCES;
+ return proc_check_root(inode);
+}
+
+extern struct seq_operations proc_pid_maps_op;
+static int maps_open(struct inode *inode, struct file *file)
+{
+ struct task_struct *task = proc_task(inode);
+ int ret = seq_open(file, &proc_pid_maps_op);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ m->private = task;
+ }
+ return ret;
+}
+
+static struct file_operations proc_maps_operations = {
+ .open = maps_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+extern struct seq_operations mounts_op;
+static int mounts_open(struct inode *inode, struct file *file)
+{
+ struct task_struct *task = proc_task(inode);
+ int ret = seq_open(file, &mounts_op);
+
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ struct namespace *namespace;
+ task_lock(task);
+ namespace = task->namespace;
+ if (namespace)
+ get_namespace(namespace);
+ task_unlock(task);
+
+ if (namespace)
+ m->private = namespace;
+ else {
+ seq_release(inode, file);
+ ret = -EINVAL;
+ }
+ }
+ 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 struct file_operations proc_mounts_operations = {
+ .open = mounts_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 = proc_task(inode);
+
+ if (count > PROC_BLOCK_SIZE)
+ count = PROC_BLOCK_SIZE;
+ if (!(page = __get_free_page(GFP_KERNEL)))
+ return -ENOMEM;
+
+ 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);
+ 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 = proc_task(file->f_dentry->d_inode);
+ char *page;
+ unsigned long src = *ppos;
+ int ret = -ESRCH;
+ struct mm_struct *mm;
+
+ if (!MAY_PTRACE(task) || !may_ptrace_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) || !may_ptrace_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:
+ 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 = proc_task(file->f_dentry->d_inode);
+ unsigned long dst = *ppos;
+
+ if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
+ return -ESRCH;
+
+ page = (char *)__get_free_page(GFP_USER);
+ if (!page)
+ return -ENOMEM;
+
+ 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);
+ 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 = proc_task(file->f_dentry->d_inode);
+ char buffer[8];
+ size_t len;
+ int oom_adjust = task->oomkilladj;
+ loff_t __ppos = *ppos;
+
+ len = sprintf(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 = proc_task(file->f_dentry->d_inode);
+ char buffer[8], *end;
+ int oom_adjust;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+ memset(buffer, 0, 8);
+ if (count > 6)
+ count = 6;
+ if (copy_from_user(buffer, buf, count))
+ return -EFAULT;
+ oom_adjust = simple_strtol(buffer, &end, 0);
+ if (oom_adjust < -16 || oom_adjust > 15)
+ return -EINVAL;
+ if (*end == '\n')
+ end++;
+ task->oomkilladj = oom_adjust;
+ 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,
+};
+
+static struct inode_operations proc_mem_inode_operations = {
+ .permission = proc_permission,
+};
+
+#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 = proc_task(inode);
+ ssize_t length;
+ char tmpbuf[TMPBUFLEN];
+
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
+ audit_get_loginuid(task->audit_context));
+ 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;
+ struct task_struct *task = proc_task(inode);
+ uid_t loginuid;
+
+ if (!capable(CAP_AUDIT_CONTROL))
+ return -EPERM;
+
+ if (current != task)
+ return -EPERM;
+
+ if (count > PAGE_SIZE)
+ count = PAGE_SIZE;
+
+ 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;
+
+ loginuid = simple_strtoul(page, &tmp, 10);
+ if (tmp == page) {
+ length = -EINVAL;
+ goto out_free_page;
+
+ }
+ length = audit_set_loginuid(task->audit_context, 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 = proc_task(file->f_dentry->d_inode);
+ char __buf[20];
+ loff_t __ppos = *ppos;
+ size_t len;
+
+ /* no need to print the trailing zero, so use only len */
+ len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
+ 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 = proc_task(file->f_dentry->d_inode);
+ char __buf[20], *end;
+ unsigned int seccomp_mode;
+
+ /* can set it only once to be even more secure */
+ if (unlikely(tsk->seccomp.mode))
+ return -EPERM;
+
+ memset(__buf, 0, sizeof(__buf));
+ count = min(count, sizeof(__buf) - 1);
+ if (copy_from_user(__buf, buf, count))
+ return -EFAULT;
+ seccomp_mode = simple_strtoul(__buf, &end, 0);
+ if (*end == '\n')
+ end++;
+ if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
+ tsk->seccomp.mode = seccomp_mode;
+ set_tsk_thread_flag(tsk, TIF_SECCOMP);
+ } else
+ return -EINVAL;
+ if (unlikely(!(end - __buf)))
+ return -EIO;
+ return end - __buf;
+}
+
+static struct file_operations proc_seccomp_operations = {
+ .read = seccomp_read,
+ .write = seccomp_write,
+};
+#endif /* CONFIG_SECCOMP */
+
+static int 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);
+
+ if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
+ goto out;
+ error = proc_check_root(inode);
+ if (error)
+ goto out;
+
+ error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
+ nd->last_type = LAST_BIND;
+out:
+ return 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;
+
+ lock_kernel();
+
+ if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
+ goto out;
+ error = proc_check_root(inode);
+ if (error)
+ 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:
+ unlock_kernel();
+ return error;
+}
+
+static struct inode_operations proc_pid_link_inode_operations = {
+ .readlink = proc_pid_readlink,
+ .follow_link = proc_pid_follow_link
+};
+
+#define NUMBUF 10
+
+static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct task_struct *p = proc_task(inode);
+ unsigned int fd, tid, ino;
+ int retval;
+ char buf[NUMBUF];
+ struct files_struct * files;
+
+ retval = -ENOENT;
+ if (!pid_alive(p))
+ goto out;
+ 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 = fake_ino(tid, PROC_TID_INO);
+ if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
+ goto out;
+ filp->f_pos++;
+ default:
+ files = get_files_struct(p);
+ if (!files)
+ goto out;
+ spin_lock(&files->file_lock);
+ for (fd = filp->f_pos-2;
+ fd < files->max_fds;
+ fd++, filp->f_pos++) {
+ unsigned int i,j;
+
+ if (!fcheck_files(files, fd))
+ continue;
+ spin_unlock(&files->file_lock);
+
+ j = 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, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
+ spin_lock(&files->file_lock);
+ break;
+ }
+ spin_lock(&files->file_lock);
+ }
+ spin_unlock(&files->file_lock);
+ put_files_struct(files);
+ }
+out:
+ 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 pid_entry *p;
+ ino_t ino;
+ int ret;
+
+ ret = -ENOENT;
+ if (!pid_alive(proc_task(inode)))
+ goto out;
+
+ ret = 0;
+ pid = proc_task(inode)->pid;
+ 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);
+ return dumpable;
+}
+
+
+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);
+ ei->task = NULL;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ inode->i_ino = fake_ino(task->pid, ino);
+
+ if (!pid_alive(task))
+ goto out_unlock;
+
+ /*
+ * grab the reference to task.
+ */
+ get_task_struct(task);
+ ei->task = task;
+ ei->type = ino;
+ inode->i_uid = 0;
+ inode->i_gid = 0;
+ if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
+ inode->i_uid = task->euid;
+ inode->i_gid = task->egid;
+ }
+ security_task_to_inode(task, inode);
+
+out:
+ return inode;
+
+out_unlock:
+ ei->pde = NULL;
+ 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.
+ */
+static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ struct inode *inode = dentry->d_inode;
+ struct task_struct *task = proc_task(inode);
+ if (pid_alive(task)) {
+ if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || 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);
+ return 1;
+ }
+ d_drop(dentry);
+ return 0;
+}
+
+static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ struct inode *inode = dentry->d_inode;
+ struct task_struct *task = proc_task(inode);
+ int fd = proc_type(inode) - PROC_TID_FD_DIR;
+ struct files_struct *files;
+
+ files = get_files_struct(task);
+ if (files) {
+ spin_lock(&files->file_lock);
+ if (fcheck_files(files, fd)) {
+ spin_unlock(&files->file_lock);
+ 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);
+ return 1;
+ }
+ spin_unlock(&files->file_lock);
+ put_files_struct(files);
+ }
+ d_drop(dentry);
+ return 0;
+}
+
+static void pid_base_iput(struct dentry *dentry, struct inode *inode)
+{
+ struct task_struct *task = proc_task(inode);
+ spin_lock(&task->proc_lock);
+ if (task->proc_dentry == dentry)
+ task->proc_dentry = NULL;
+ spin_unlock(&task->proc_lock);
+ iput(inode);
+}
+
+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 !pid_alive(proc_task(dentry->d_inode));
+}
+
+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,
+};
+
+static struct dentry_operations pid_base_dentry_operations =
+{
+ .d_revalidate = pid_revalidate,
+ .d_iput = pid_base_iput,
+ .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 = proc_task(dir);
+ unsigned fd = name_to_int(dentry);
+ struct file * file;
+ struct files_struct * files;
+ struct inode *inode;
+ struct proc_inode *ei;
+
+ if (fd == ~0U)
+ goto out;
+ if (!pid_alive(task))
+ goto out;
+
+ inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
+ if (!inode)
+ goto out;
+ ei = PROC_I(inode);
+ files = get_files_struct(task);
+ if (!files)
+ goto out_unlock;
+ inode->i_mode = S_IFLNK;
+ 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);
+ return NULL;
+
+out_unlock2:
+ spin_unlock(&files->file_lock);
+ put_files_struct(files);
+out_unlock:
+ iput(inode);
+out:
+ return ERR_PTR(-ENOENT);
+}
+
+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 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,
+ .permission = proc_permission,
+};
+
+static struct inode_operations proc_task_inode_operations = {
+ .lookup = proc_task_lookup,
+ .permission = proc_permission,
+};
+
+#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 = proc_task(inode);
+
+ if (count > PAGE_SIZE)
+ count = PAGE_SIZE;
+ if (!(page = __get_free_page(GFP_KERNEL)))
+ return -ENOMEM;
+
+ 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);
+ 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 = proc_task(inode);
+
+ if (count > PAGE_SIZE)
+ count = PAGE_SIZE;
+ 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;
+
+ length = security_setprocattr(task,
+ (char*)file->f_dentry->d_name.name,
+ (void*)page, count);
+out:
+ free_page((unsigned long) page);
+ 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;
+ int error;
+ struct task_struct *task = proc_task(dir);
+ struct pid_entry *p;
+ struct proc_inode *ei;
+
+ error = -ENOENT;
+ inode = NULL;
+
+ if (!pid_alive(task))
+ goto out;
+
+ 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 = -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 = 3;
+ 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;
+ case PROC_TID_MEM:
+ case PROC_TGID_MEM:
+ inode->i_op = &proc_mem_inode_operations;
+ 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_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:
+ 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);
+ return ERR_PTR(-EINVAL);
+ }
+ dentry->d_op = &pid_dentry_operations;
+ d_add(dentry, inode);
+ return NULL;
+
+out:
+ return ERR_PTR(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,
+};
+
+static struct inode_operations proc_tid_base_inode_operations = {
+ .lookup = proc_tid_base_lookup,
+};
+
+#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,
+};
+
+static struct inode_operations proc_tid_attr_inode_operations = {
+ .lookup = proc_tid_attr_lookup,
+};
+#endif
+
+/*
+ * /proc/self:
+ */
+static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
+{
+ char tmp[30];
+ sprintf(tmp, "%d", current->tgid);
+ return vfs_readlink(dentry,buffer,buflen,tmp);
+}
+
+static int proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ char tmp[30];
+ sprintf(tmp, "%d", current->tgid);
+ return vfs_follow_link(nd,tmp);
+}
+
+static struct inode_operations proc_self_inode_operations = {
+ .readlink = proc_self_readlink,
+ .follow_link = proc_self_follow_link,
+};
+
+/**
+ * proc_pid_unhash - Unhash /proc/<pid> entry from the dcache.
+ * @p: task that should be flushed.
+ *
+ * Drops the /proc/<pid> dcache entry from the hash chains.
+ *
+ * Dropping /proc/<pid> entries and detach_pid must be synchroneous,
+ * otherwise e.g. /proc/<pid>/exe might point to the wrong executable,
+ * if the pid value is immediately reused. This is enforced by
+ * - caller must acquire spin_lock(p->proc_lock)
+ * - must be called before detach_pid()
+ * - proc_pid_lookup acquires proc_lock, and checks that
+ * the target is not dead by looking at the attach count
+ * of PIDTYPE_PID.
+ */
+
+struct dentry *proc_pid_unhash(struct task_struct *p)
+{
+ struct dentry *proc_dentry;
+
+ proc_dentry = p->proc_dentry;
+ if (proc_dentry != NULL) {
+
+ spin_lock(&dcache_lock);
+ spin_lock(&proc_dentry->d_lock);
+ if (!d_unhashed(proc_dentry)) {
+ dget_locked(proc_dentry);
+ __d_drop(proc_dentry);
+ spin_unlock(&proc_dentry->d_lock);
+ } else {
+ spin_unlock(&proc_dentry->d_lock);
+ proc_dentry = NULL;
+ }
+ spin_unlock(&dcache_lock);
+ }
+ return proc_dentry;
+}
+
+/**
+ * proc_pid_flush - recover memory used by stale /proc/<pid>/x entries
+ * @proc_entry: directoy to prune.
+ *
+ * Shrink the /proc directory that was used by the just killed thread.
+ */
+
+void proc_pid_flush(struct dentry *proc_dentry)
+{
+ might_sleep();
+ if(proc_dentry != NULL) {
+ shrink_dcache_parent(proc_dentry);
+ dput(proc_dentry);
+ }
+}
+
+/* SMP-safe */
+struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
+{
+ struct task_struct *task;
+ struct inode *inode;
+ struct proc_inode *ei;
+ unsigned tgid;
+ int died;
+
+ 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;
+
+ read_lock(&tasklist_lock);
+ task = find_task_by_pid(tgid);
+ if (task)
+ get_task_struct(task);
+ read_unlock(&tasklist_lock);
+ if (!task)
+ goto out;
+
+ inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
+
+
+ if (!inode) {
+ put_task_struct(task);
+ 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_nlink = 3;
+ inode->i_flags|=S_IMMUTABLE;
+
+ dentry->d_op = &pid_base_dentry_operations;
+
+ died = 0;
+ d_add(dentry, inode);
+ spin_lock(&task->proc_lock);
+ task->proc_dentry = dentry;
+ if (!pid_alive(task)) {
+ dentry = proc_pid_unhash(task);
+ died = 1;
+ }
+ spin_unlock(&task->proc_lock);
+
+ put_task_struct(task);
+ if (died) {
+ proc_pid_flush(dentry);
+ goto out;
+ }
+ return NULL;
+out:
+ return ERR_PTR(-ENOENT);
+}
+
+/* SMP-safe */
+static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
+{
+ struct task_struct *task;
+ struct task_struct *leader = proc_task(dir);
+ struct inode *inode;
+ unsigned tid;
+
+ tid = name_to_int(dentry);
+ if (tid == ~0U)
+ goto out;
+
+ read_lock(&tasklist_lock);
+ task = find_task_by_pid(tid);
+ if (task)
+ get_task_struct(task);
+ read_unlock(&tasklist_lock);
+ 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_nlink = 3;
+ inode->i_flags|=S_IMMUTABLE;
+
+ dentry->d_op = &pid_base_dentry_operations;
+
+ d_add(dentry, inode);
+
+ put_task_struct(task);
+ return NULL;
+out_drop_task:
+ put_task_struct(task);
+out:
+ return ERR_PTR(-ENOENT);
+}
+
+#define PROC_NUMBUF 10
+#define PROC_MAXPIDS 20
+
+/*
+ * Get a few tgid's to return for filldir - we need to hold the
+ * tasklist lock while doing this, and we must release it before
+ * we actually do the filldir itself, so we use a temp buffer..
+ */
+static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
+{
+ struct task_struct *p;
+ int nr_tgids = 0;
+
+ index--;
+ read_lock(&tasklist_lock);
+ p = NULL;
+ if (version) {
+ p = find_task_by_pid(version);
+ if (p && !thread_group_leader(p))
+ p = NULL;
+ }
+
+ if (p)
+ index = 0;
+ else
+ p = next_task(&init_task);
+
+ for ( ; p != &init_task; p = next_task(p)) {
+ int tgid = p->pid;
+ if (!pid_alive(p))
+ continue;
+ if (--index >= 0)
+ continue;
+ tgids[nr_tgids] = tgid;
+ nr_tgids++;
+ if (nr_tgids >= PROC_MAXPIDS)
+ break;
+ }
+ read_unlock(&tasklist_lock);
+ return nr_tgids;
+}
+
+/*
+ * Get a few tid's to return for filldir - we need to hold the
+ * tasklist lock while doing this, and we must release it before
+ * we actually do the filldir itself, so we use a temp buffer..
+ */
+static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
+{
+ struct task_struct *leader_task = proc_task(dir);
+ struct task_struct *task = leader_task;
+ int nr_tids = 0;
+
+ index -= 2;
+ read_lock(&tasklist_lock);
+ /*
+ * The starting point task (leader_task) might be an already
+ * unlinked task, which cannot be used to access the task-list
+ * via next_thread().
+ */
+ if (pid_alive(task)) do {
+ int tid = task->pid;
+
+ if (--index >= 0)
+ continue;
+ tids[nr_tids] = tid;
+ nr_tids++;
+ if (nr_tids >= PROC_MAXPIDS)
+ break;
+ } while ((task = next_thread(task)) != leader_task);
+ read_unlock(&tasklist_lock);
+ return nr_tids;
+}
+
+/* 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 tgid_array[PROC_MAXPIDS];
+ char buf[PROC_NUMBUF];
+ unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
+ unsigned int nr_tgids, i;
+ int next_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++;
+ }
+
+ /* f_version caches the tgid value that the last readdir call couldn't
+ * return. lseek aka telldir automagically resets f_version to 0.
+ */
+ next_tgid = filp->f_version;
+ filp->f_version = 0;
+ for (;;) {
+ nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
+ if (!nr_tgids) {
+ /* no more entries ! */
+ break;
+ }
+ next_tgid = 0;
+
+ /* do not use the last found pid, reserve it for next_tgid */
+ if (nr_tgids == PROC_MAXPIDS) {
+ nr_tgids--;
+ next_tgid = tgid_array[nr_tgids];
+ }
+
+ for (i=0;i<nr_tgids;i++) {
+ int tgid = tgid_array[i];
+ ino_t ino = fake_ino(tgid,PROC_TGID_INO);
+ unsigned long j = PROC_NUMBUF;
+
+ do
+ buf[--j] = '0' + (tgid % 10);
+ while ((tgid /= 10) != 0);
+
+ if (filldir(dirent, buf+j, PROC_NUMBUF-j, 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_array[i];
+ goto out;
+ }
+ filp->f_pos++;
+ nr++;
+ }
+ }
+out:
+ return 0;
+}
+
+/* for the /proc/TGID/task/ directories */
+static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+ unsigned int tid_array[PROC_MAXPIDS];
+ char buf[PROC_NUMBUF];
+ unsigned int nr_tids, i;
+ struct dentry *dentry = filp->f_dentry;
+ struct inode *inode = dentry->d_inode;
+ int retval = -ENOENT;
+ ino_t ino;
+ unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
+
+ if (!pid_alive(proc_task(inode)))
+ goto out;
+ 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 */
+ }
+
+ nr_tids = get_tid_list(pos, tid_array, inode);
+
+ for (i = 0; i < nr_tids; i++) {
+ unsigned long j = PROC_NUMBUF;
+ int tid = tid_array[i];
+
+ ino = fake_ino(tid,PROC_TID_INO);
+
+ do
+ buf[--j] = '0' + (tid % 10);
+ while ((tid /= 10) != 0);
+
+ if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
+ break;
+ pos++;
+ }
+out:
+ filp->f_pos = pos;
+ return retval;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 09:24:35 +0000