X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fproc%2Fbase.c;h=fbff900fd5ad3c690003935033318bda66802c17;hb=2894d650cd9715d00ca196c711265819ef6ebd2d;hp=ea115d4c9f59145bbe70eef7c9a8476bdf2d70d7;hpb=2b47c3611de05c585e2d81204f6c7e3e255a3461;p=linux-2.6

diff --git a/fs/proc/base.c b/fs/proc/base.c
index ea115d4c9f..fbff900fd5 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -67,6 +67,7 @@
 #include <linux/mount.h>
 #include <linux/security.h>
 #include <linux/ptrace.h>
+#include <linux/cgroup.h>
 #include <linux/cpuset.h>
 #include <linux/audit.h>
 #include <linux/poll.h>
@@ -199,27 +200,6 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf
 	 (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;
-
-		res = -ESRCH;
-		if (!ptrace_may_attach(task))
-			goto out;
-
-		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);
-out:
-		mmput(mm);
-	}
-	return res;
-}
-
 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
 {
 	int res = 0;
@@ -658,6 +638,76 @@ static const struct file_operations proc_mem_operations = {
 	.open		= mem_open,
 };
 
+static ssize_t environ_read(struct file *file, char __user *buf,
+			size_t count, loff_t *ppos)
+{
+	struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
+	char *page;
+	unsigned long src = *ppos;
+	int ret = -ESRCH;
+	struct mm_struct *mm;
+
+	if (!task)
+		goto out_no_task;
+
+	if (!ptrace_may_attach(task))
+		goto out;
+
+	ret = -ENOMEM;
+	page = (char *)__get_free_page(GFP_TEMPORARY);
+	if (!page)
+		goto out;
+
+	ret = 0;
+
+	mm = get_task_mm(task);
+	if (!mm)
+		goto out_free;
+
+	while (count > 0) {
+		int this_len, retval, max_len;
+
+		this_len = mm->env_end - (mm->env_start + src);
+
+		if (this_len <= 0)
+			break;
+
+		max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
+		this_len = (this_len > max_len) ? max_len : this_len;
+
+		retval = access_process_vm(task, (mm->env_start + src),
+			page, this_len, 0);
+
+		if (retval <= 0) {
+			ret = retval;
+			break;
+		}
+
+		if (copy_to_user(buf, page, retval)) {
+			ret = -EFAULT;
+			break;
+		}
+
+		ret += retval;
+		src += retval;
+		buf += retval;
+		count -= retval;
+	}
+	*ppos = src;
+
+	mmput(mm);
+out_free:
+	free_page((unsigned long) page);
+out:
+	put_task_struct(task);
+out_no_task:
+	return ret;
+}
+
+static const struct file_operations proc_environ_operations = {
+	.read		= environ_read,
+};
+
 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
 				size_t count, loff_t *ppos)
 {
@@ -2049,7 +2099,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 	DIR("task",       S_IRUGO|S_IXUGO, task),
 	DIR("fd",         S_IRUSR|S_IXUSR, fd),
 	DIR("fdinfo",     S_IRUSR|S_IXUSR, fdinfo),
-	INF("environ",    S_IRUSR, pid_environ),
+	REG("environ",    S_IRUSR, environ),
 	INF("auxv",       S_IRUSR, pid_auxv),
 	INF("status",     S_IRUGO, pid_status),
 #ifdef CONFIG_SCHED_DEBUG
@@ -2081,8 +2131,11 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_SCHEDSTATS
 	INF("schedstat",  S_IRUGO, pid_schedstat),
 #endif
-#ifdef CONFIG_CPUSETS
+#ifdef CONFIG_PROC_PID_CPUSET
 	REG("cpuset",     S_IRUGO, cpuset),
+#endif
+#ifdef CONFIG_CGROUPS
+	REG("cgroup",  S_IRUGO, cgroup),
 #endif
 	INF("oom_score",  S_IRUGO, oom_score),
 	REG("oom_adj",    S_IRUGO|S_IWUSR, oom_adjust),
@@ -2336,7 +2389,7 @@ out_no_task:
 static const struct pid_entry tid_base_stuff[] = {
 	DIR("fd",        S_IRUSR|S_IXUSR, fd),
 	DIR("fdinfo",    S_IRUSR|S_IXUSR, fdinfo),
-	INF("environ",   S_IRUSR, pid_environ),
+	REG("environ",   S_IRUSR, environ),
 	INF("auxv",      S_IRUSR, pid_auxv),
 	INF("status",    S_IRUGO, pid_status),
 #ifdef CONFIG_SCHED_DEBUG
@@ -2367,8 +2420,11 @@ static const struct pid_entry tid_base_stuff[] = {
 #ifdef CONFIG_SCHEDSTATS
 	INF("schedstat", S_IRUGO, pid_schedstat),
 #endif
-#ifdef CONFIG_CPUSETS
+#ifdef CONFIG_PROC_PID_CPUSET
 	REG("cpuset",    S_IRUGO, cpuset),
+#endif
+#ifdef CONFIG_CGROUPS
+	REG("cgroup",  S_IRUGO, cgroup),
 #endif
 	INF("oom_score", S_IRUGO, oom_score),
 	REG("oom_adj",   S_IRUGO|S_IWUSR, oom_adjust),